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Miñano Briceño, Maria Isabel - One of the best experts on this subject based on the ideXlab platform.
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Comparación de las propiedades físicas – mecánicas de la resistencia a la compresión del mortero convencional y mortero MASSA DUM DUM, Trujillo - 2019 (Tesis parcial)
'Dipartimento di Economia Universita di Perugia (IT)', 2019Co-Authors: Hernandez Pascual, Ever Letelier, Miñano Briceño, Maria IsabelAbstract:ABSTRACT The objective of this research work is to determine the comparison of the physical and mechanical properties of conventional mortar and massa dum dum, as well as the influence on the resistance to Compression of masonry piles. For this Test 10 masonry prisms were constructed with clay units (hollow bricks) of conventional mortar (cement - sand - water), with a cement - sand dosage of 1: 3, with a joint thickness of 1.5 cm, with 03 specimens; Regarding massa dum dum, the seated piles were applied with masonry units in continuous lines of 1 cm in diameter on the horizontal surface. In addition, the Axial Compression Test of conventional mortar and massa dum dum was performed on Test pieces of 5 cm per side. The present investigation was developed in the Materials Resistance Laboratory of the University Private of the North – Trujillo headquarters, the Test specimens were elaborated considering 01 type of baked clay brick very used in the construction for supporting masonry walls, King Kong Brick 18 holes at 50%, applied to masonry units, masonry piles. For each technique, specimens were Tested at Axial Compression, in order to determine the average compressive strength of the masonry (f'm) and mortars, according to the construction procedures of masonry stacks with conventional mortar and piles. masonry with massa dum dum; In addition, Tests were carried out on the resistance to Axial Compression of mortars (conventional mortar and massa dum dum); in relation to the latter, the product was used with the help of an applicator, according to the manufacturer's specification. As a result of the laboratory Tests, it was obtained that the use of conventional mortar excels in values of Axial Compression resistance, therefore, the present investigation determined that the application of massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) is the least adequate compared to that of conventional convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). In this sense, the use of this new alternative material does not replace the conventional mortar with the use of King Kong brick 18 holes Lark brand for bearing walls.TesisRESUMEN El presente trabajo de investigación tiene como objetivo determinar la comparación de las propiedades físicas y mecánicas del mortero convencional y massa dum dum, así como también la influencia en la resistencia a la compresión de pilas de albañilería. Para este ensayo se construyeron 10 prismas de albañilería con unidades de arcilla (ladrillos 18 huecos) de mortero convencional (cemento – arena - agua), con una dosificación de cemento – arena 1:3, con un espesor de junta de 1.5 cm, con 03 especímenes; respecto a massa dum dum se aplicó el asentado de las pilas con unidades de albañilería en líneas continuas de 1 cm de diámetro sobre la superficie horizontal. Además, se realizó el ensayo de compresión Axial de mortero convencional y massa dum dum en probetas de 5 cm por lado. La presente investigación se desarrolló en el Laboratorio de Resistencia de Materiales de la Universidad Privada del Norte – Sede Trujillo, los especímenes de ensayo fueron elaborados considerando 01 tipo de ladrillo de arcilla cocida muy utilizado en la construcción para muros de albañilería portante, Ladrillo King Kong 18 huecos al 50%, aplicado en las unidades de albañilería, pilas de albañilería. Por cada técnica se ensayaron especímenes a compresión Axial, a fin de determinar la resistencia promedio a compresión de la albañilería (f´m) y de los morteros, según los procedimientos constructivos propios de las pilas de albañilería con mortero convencional y de las pilas de albañilería con massa dum dum; además se realizó los ensayos de resistencia a la compresión Axial de morteros ( mortero convencionales y massa dum dum); en relación de este último, se utilizó el producto con ayuda de un aplicador, según especificación del fabricante. Como resultado de los ensayos de laboratorio, se obtuvo que el empleo del mortero convencional sobresale de manera clara en valores de resistencia a compresión Axial, por lo tanto, la presente investigación determinó que la aplicación de massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) es la menos adecuada en comparación a la del mortero convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). En tal sentido el uso de este nuevo material alternativo no remplaza al mortero convencional con la utilización del ladrillo King Kong 18 huecos marca Lark para muros portantes
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Comparación de las propiedades físicas – mecánicas de la resistencia a la compresión del mortero convencional y mortero MASSA DUM DUM, Trujillo - 2019
Universidad Privada del Norte, 2019Co-Authors: Hernandez Pascual, Ever Letelier, Miñano Briceño, Maria IsabelAbstract:RESUMEN El presente trabajo de investigación tiene como objetivo determinar la comparación de las propiedades físicas y mecánicas del mortero convencional y massa dum dum, así como también la influencia en la resistencia a la compresión de pilas de albañilería. Para este ensayo se construyeron 10 prismas de albañilería con unidades de arcilla (ladrillos 18 huecos) de mortero convencional (cemento – arena - agua), con una dosificación de cemento – arena 1:3, con un espesor de junta de 1.5 cm, con 03 especímenes; respecto a massa dum dum se aplicó el asentado de las pilas con unidades de albañilería en líneas continuas de 1 cm de diámetro sobre la superficie horizontal. Además, se realizó el ensayo de compresión Axial de mortero convencional y massa dum dum en probetas de 5 cm por lado. La presente investigación se desarrolló en el Laboratorio de Resistencia de Materiales de la Universidad Privada del Norte – Sede Trujillo, los especímenes de ensayo fueron elaborados considerando 01 tipo de ladrillo de arcilla cocida muy utilizado en la construcción para muros de albañilería portante, Ladrillo King Kong 18 huecos al 50%, aplicado en las unidades de albañilería, pilas de albañilería. Por cada técnica se ensayaron especímenes a compresión Axial, a fin de determinar la resistencia promedio a compresión de la albañilería (f´m) y de los morteros, según los procedimientos constructivos propios de las pilas de albañilería con mortero convencional y de las pilas de albañilería con massa dum dum; además se realizó los ensayos de resistencia a la compresión Axial de morteros ( mortero convencionales y massa dum dum); en relación de este último, se utilizó el producto con ayuda de un aplicador, según especificación del fabricante. Como resultado de los ensayos de laboratorio, se obtuvo que el empleo del mortero convencional sobresale de manera clara en valores de resistencia a compresión Axial, por lo tanto, la presente investigación determinó que la aplicación de massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) es la menos adecuada en comparación a la del mortero convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). En tal sentido el uso de este nuevo material alternativo no remplaza al mortero convencional con la utilización del ladrillo King Kong 18 huecos marca Lark para muros portantes. PALABRAS CLAVE: Morteros, resistencia compresión, masa dum dum, unidades de albañilería.ABSTRACT The objective of this research work is to determine the comparison of the physical and mechanical properties of conventional mortar and massa dum dum, as well as the influence on the resistance to Compression of masonry piles. For this Test 10 masonry prisms were constructed with clay units (hollow bricks) of conventional mortar (cement - sand - water), with a cement - sand dosage of 1: 3, with a joint thickness of 1.5 cm, with 03 specimens; Regarding massa dum dum, the seated piles were applied with masonry units in continuous lines of 1 cm in diameter on the horizontal surface. In addition, the Axial Compression Test of conventional mortar and massa dum dum was performed on Test pieces of 5 cm per side. The present investigation was developed in the Materials Resistance Laboratory of the University Private of the North – Trujillo headquarters, the Test specimens were elaborated considering 01 type of baked clay brick very used in the construction for supporting masonry walls, King Kong Brick 18 holes at 50%, applied to masonry units, masonry piles. For each technique, specimens were Tested at Axial Compression, in order to determine the average compressive strength of the masonry (f'm) and mortars, according to the construction procedures of masonry stacks with conventional mortar and piles. masonry with massa dum dum; In addition, Tests were carried out on the resistance to Axial Compression of mortars (conventional mortar and massa dum dum); in relation to the latter, the product was used with the help of an applicator, according to the manufacturer's specification. As a result of the laboratory Tests, it was obtained that the use of conventional mortar excels in values of Axial Compression resistance, therefore, the present investigation determined that the application of massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) is the least adequate compared to that of conventional convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). In this sense, the use of this new alternative material does not replace the conventional mortar with the use of King Kong brick 18 holes Lark brand for bearing walls. KEY WORDS: Mortars, Compression resistance, massa dum dum, masonry units
Hernandez Pascual, Ever Letelier - One of the best experts on this subject based on the ideXlab platform.
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Comparación de las propiedades físicas – mecánicas de la resistencia a la compresión del mortero convencional y mortero MASSA DUM DUM, Trujillo - 2019 (Tesis parcial)
'Dipartimento di Economia Universita di Perugia (IT)', 2019Co-Authors: Hernandez Pascual, Ever Letelier, Miñano Briceño, Maria IsabelAbstract:ABSTRACT The objective of this research work is to determine the comparison of the physical and mechanical properties of conventional mortar and massa dum dum, as well as the influence on the resistance to Compression of masonry piles. For this Test 10 masonry prisms were constructed with clay units (hollow bricks) of conventional mortar (cement - sand - water), with a cement - sand dosage of 1: 3, with a joint thickness of 1.5 cm, with 03 specimens; Regarding massa dum dum, the seated piles were applied with masonry units in continuous lines of 1 cm in diameter on the horizontal surface. In addition, the Axial Compression Test of conventional mortar and massa dum dum was performed on Test pieces of 5 cm per side. The present investigation was developed in the Materials Resistance Laboratory of the University Private of the North – Trujillo headquarters, the Test specimens were elaborated considering 01 type of baked clay brick very used in the construction for supporting masonry walls, King Kong Brick 18 holes at 50%, applied to masonry units, masonry piles. For each technique, specimens were Tested at Axial Compression, in order to determine the average compressive strength of the masonry (f'm) and mortars, according to the construction procedures of masonry stacks with conventional mortar and piles. masonry with massa dum dum; In addition, Tests were carried out on the resistance to Axial Compression of mortars (conventional mortar and massa dum dum); in relation to the latter, the product was used with the help of an applicator, according to the manufacturer's specification. As a result of the laboratory Tests, it was obtained that the use of conventional mortar excels in values of Axial Compression resistance, therefore, the present investigation determined that the application of massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) is the least adequate compared to that of conventional convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). In this sense, the use of this new alternative material does not replace the conventional mortar with the use of King Kong brick 18 holes Lark brand for bearing walls.TesisRESUMEN El presente trabajo de investigación tiene como objetivo determinar la comparación de las propiedades físicas y mecánicas del mortero convencional y massa dum dum, así como también la influencia en la resistencia a la compresión de pilas de albañilería. Para este ensayo se construyeron 10 prismas de albañilería con unidades de arcilla (ladrillos 18 huecos) de mortero convencional (cemento – arena - agua), con una dosificación de cemento – arena 1:3, con un espesor de junta de 1.5 cm, con 03 especímenes; respecto a massa dum dum se aplicó el asentado de las pilas con unidades de albañilería en líneas continuas de 1 cm de diámetro sobre la superficie horizontal. Además, se realizó el ensayo de compresión Axial de mortero convencional y massa dum dum en probetas de 5 cm por lado. La presente investigación se desarrolló en el Laboratorio de Resistencia de Materiales de la Universidad Privada del Norte – Sede Trujillo, los especímenes de ensayo fueron elaborados considerando 01 tipo de ladrillo de arcilla cocida muy utilizado en la construcción para muros de albañilería portante, Ladrillo King Kong 18 huecos al 50%, aplicado en las unidades de albañilería, pilas de albañilería. Por cada técnica se ensayaron especímenes a compresión Axial, a fin de determinar la resistencia promedio a compresión de la albañilería (f´m) y de los morteros, según los procedimientos constructivos propios de las pilas de albañilería con mortero convencional y de las pilas de albañilería con massa dum dum; además se realizó los ensayos de resistencia a la compresión Axial de morteros ( mortero convencionales y massa dum dum); en relación de este último, se utilizó el producto con ayuda de un aplicador, según especificación del fabricante. Como resultado de los ensayos de laboratorio, se obtuvo que el empleo del mortero convencional sobresale de manera clara en valores de resistencia a compresión Axial, por lo tanto, la presente investigación determinó que la aplicación de massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) es la menos adecuada en comparación a la del mortero convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). En tal sentido el uso de este nuevo material alternativo no remplaza al mortero convencional con la utilización del ladrillo King Kong 18 huecos marca Lark para muros portantes
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Comparación de las propiedades físicas – mecánicas de la resistencia a la compresión del mortero convencional y mortero MASSA DUM DUM, Trujillo - 2019
Universidad Privada del Norte, 2019Co-Authors: Hernandez Pascual, Ever Letelier, Miñano Briceño, Maria IsabelAbstract:RESUMEN El presente trabajo de investigación tiene como objetivo determinar la comparación de las propiedades físicas y mecánicas del mortero convencional y massa dum dum, así como también la influencia en la resistencia a la compresión de pilas de albañilería. Para este ensayo se construyeron 10 prismas de albañilería con unidades de arcilla (ladrillos 18 huecos) de mortero convencional (cemento – arena - agua), con una dosificación de cemento – arena 1:3, con un espesor de junta de 1.5 cm, con 03 especímenes; respecto a massa dum dum se aplicó el asentado de las pilas con unidades de albañilería en líneas continuas de 1 cm de diámetro sobre la superficie horizontal. Además, se realizó el ensayo de compresión Axial de mortero convencional y massa dum dum en probetas de 5 cm por lado. La presente investigación se desarrolló en el Laboratorio de Resistencia de Materiales de la Universidad Privada del Norte – Sede Trujillo, los especímenes de ensayo fueron elaborados considerando 01 tipo de ladrillo de arcilla cocida muy utilizado en la construcción para muros de albañilería portante, Ladrillo King Kong 18 huecos al 50%, aplicado en las unidades de albañilería, pilas de albañilería. Por cada técnica se ensayaron especímenes a compresión Axial, a fin de determinar la resistencia promedio a compresión de la albañilería (f´m) y de los morteros, según los procedimientos constructivos propios de las pilas de albañilería con mortero convencional y de las pilas de albañilería con massa dum dum; además se realizó los ensayos de resistencia a la compresión Axial de morteros ( mortero convencionales y massa dum dum); en relación de este último, se utilizó el producto con ayuda de un aplicador, según especificación del fabricante. Como resultado de los ensayos de laboratorio, se obtuvo que el empleo del mortero convencional sobresale de manera clara en valores de resistencia a compresión Axial, por lo tanto, la presente investigación determinó que la aplicación de massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) es la menos adecuada en comparación a la del mortero convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). En tal sentido el uso de este nuevo material alternativo no remplaza al mortero convencional con la utilización del ladrillo King Kong 18 huecos marca Lark para muros portantes. PALABRAS CLAVE: Morteros, resistencia compresión, masa dum dum, unidades de albañilería.ABSTRACT The objective of this research work is to determine the comparison of the physical and mechanical properties of conventional mortar and massa dum dum, as well as the influence on the resistance to Compression of masonry piles. For this Test 10 masonry prisms were constructed with clay units (hollow bricks) of conventional mortar (cement - sand - water), with a cement - sand dosage of 1: 3, with a joint thickness of 1.5 cm, with 03 specimens; Regarding massa dum dum, the seated piles were applied with masonry units in continuous lines of 1 cm in diameter on the horizontal surface. In addition, the Axial Compression Test of conventional mortar and massa dum dum was performed on Test pieces of 5 cm per side. The present investigation was developed in the Materials Resistance Laboratory of the University Private of the North – Trujillo headquarters, the Test specimens were elaborated considering 01 type of baked clay brick very used in the construction for supporting masonry walls, King Kong Brick 18 holes at 50%, applied to masonry units, masonry piles. For each technique, specimens were Tested at Axial Compression, in order to determine the average compressive strength of the masonry (f'm) and mortars, according to the construction procedures of masonry stacks with conventional mortar and piles. masonry with massa dum dum; In addition, Tests were carried out on the resistance to Axial Compression of mortars (conventional mortar and massa dum dum); in relation to the latter, the product was used with the help of an applicator, according to the manufacturer's specification. As a result of the laboratory Tests, it was obtained that the use of conventional mortar excels in values of Axial Compression resistance, therefore, the present investigation determined that the application of massa dum dum (f'm = 3.65 Kg/cm2; f'm = 22.90 Kg/cm2) is the least adequate compared to that of conventional convencional (f'm = 118.16 Kg/cm2; f'm = 63.18 Kg/cm2). In this sense, the use of this new alternative material does not replace the conventional mortar with the use of King Kong brick 18 holes Lark brand for bearing walls. KEY WORDS: Mortars, Compression resistance, massa dum dum, masonry units
Fa-cheng Wang - One of the best experts on this subject based on the ideXlab platform.
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Axial Compression behavior of circular concrete filled high strength thin walled steel tubular columns with out of code d t ratios
Advances in Materials Science and Engineering, 2021Co-Authors: Jian-tao Wang, Qing Sun, Shi-ming Zhou, Fa-cheng WangAbstract:This paper systematically investigated the Axial Compression behavior of circular concrete-filled high-strength thin-walled steel tubular (CFHTST) columns with out-of-code diameter-to-thickness (D/t) ratios. The Axial Compression Test was first conducted to examine the failure mode, load-displacement curves, and composite mechanism effect. The finite element (FE) model was thereafter established to perform full-range analysis on the load versus displacement curve as well as the interaction behavior, where the parametric study was performed to investigate the influences of the material strengths and geometric sizes. Subsequently, the applicability of typical design methods was evaluated, and a revised equation for determining strain escy corresponding to ultimate strength was established to assess the plastic deformation capacity of CFHTST columns. Finally, a theoretical model for calculating Axial bearing capacity was derived based on unified twin-shear strength theory by considering the influence of intermediate principal stress. The research results indicate that a relatively high confine effect can be guaranteed for CFHTST columns under out-of-code D/t ratios, given that the ratio Nu/Nnom between the measured capacity (Nu) and nominal cross-sectional capacity (Nnom) mainly distributes within 1.179∼1.292; the full-range analysis reflects that the Axial load-deformation curve can be distinguished by four various loading stages; the scope b = 0.3∼0.55 of intermediate stress coefficient is generally suggested for predicting Axial strength of circular CFST columns within an error of ±5%. The abovementioned study can provide the meaningful design reference for the analysis and application of CFHTST columns.
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Axial Compression Behavior of Circular Concrete-Filled High-Strength Thin-Walled Steel Tubular Columns with Out-of-Code D/t Ratios
'Hindawi Limited', 2021Co-Authors: Jian-tao Wang, Qing Sun, Shi-ming Zhou, Fa-cheng WangAbstract:This paper systematically investigated the Axial Compression behavior of circular concrete-filled high-strength thin-walled steel tubular (CFHTST) columns with out-of-code diameter-to-thickness (D/t) ratios. The Axial Compression Test was first conducted to examine the failure mode, load-displacement curves, and composite mechanism effect. The finite element (FE) model was thereafter established to perform full-range analysis on the load versus displacement curve as well as the interaction behavior, where the parametric study was performed to investigate the influences of the material strengths and geometric sizes. Subsequently, the applicability of typical design methods was evaluated, and a revised equation for determining strain εscy corresponding to ultimate strength was established to assess the plastic deformation capacity of CFHTST columns. Finally, a theoretical model for calculating Axial bearing capacity was derived based on unified twin-shear strength theory by considering the influence of intermediate principal stress. The research results indicate that a relatively high confine effect can be guaranteed for CFHTST columns under out-of-code D/t ratios, given that the ratio Nu/Nnom between the measured capacity (Nu) and nominal cross-sectional capacity (Nnom) mainly distributes within 1.179∼1.292; the full-range analysis reflects that the Axial load-deformation curve can be distinguished by four various loading stages; the scope b = 0.3∼0.55 of intermediate stress coefficient is generally suggested for predicting Axial strength of circular CFST columns within an error of ±5%. The abovementioned study can provide the meaningful design reference for the analysis and application of CFHTST columns
Jian-tao Wang - One of the best experts on this subject based on the ideXlab platform.
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Axial Compression behavior of circular concrete filled high strength thin walled steel tubular columns with out of code d t ratios
Advances in Materials Science and Engineering, 2021Co-Authors: Jian-tao Wang, Qing Sun, Shi-ming Zhou, Fa-cheng WangAbstract:This paper systematically investigated the Axial Compression behavior of circular concrete-filled high-strength thin-walled steel tubular (CFHTST) columns with out-of-code diameter-to-thickness (D/t) ratios. The Axial Compression Test was first conducted to examine the failure mode, load-displacement curves, and composite mechanism effect. The finite element (FE) model was thereafter established to perform full-range analysis on the load versus displacement curve as well as the interaction behavior, where the parametric study was performed to investigate the influences of the material strengths and geometric sizes. Subsequently, the applicability of typical design methods was evaluated, and a revised equation for determining strain escy corresponding to ultimate strength was established to assess the plastic deformation capacity of CFHTST columns. Finally, a theoretical model for calculating Axial bearing capacity was derived based on unified twin-shear strength theory by considering the influence of intermediate principal stress. The research results indicate that a relatively high confine effect can be guaranteed for CFHTST columns under out-of-code D/t ratios, given that the ratio Nu/Nnom between the measured capacity (Nu) and nominal cross-sectional capacity (Nnom) mainly distributes within 1.179∼1.292; the full-range analysis reflects that the Axial load-deformation curve can be distinguished by four various loading stages; the scope b = 0.3∼0.55 of intermediate stress coefficient is generally suggested for predicting Axial strength of circular CFST columns within an error of ±5%. The abovementioned study can provide the meaningful design reference for the analysis and application of CFHTST columns.
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Axial Compression Behavior of Circular Concrete-Filled High-Strength Thin-Walled Steel Tubular Columns with Out-of-Code D/t Ratios
'Hindawi Limited', 2021Co-Authors: Jian-tao Wang, Qing Sun, Shi-ming Zhou, Fa-cheng WangAbstract:This paper systematically investigated the Axial Compression behavior of circular concrete-filled high-strength thin-walled steel tubular (CFHTST) columns with out-of-code diameter-to-thickness (D/t) ratios. The Axial Compression Test was first conducted to examine the failure mode, load-displacement curves, and composite mechanism effect. The finite element (FE) model was thereafter established to perform full-range analysis on the load versus displacement curve as well as the interaction behavior, where the parametric study was performed to investigate the influences of the material strengths and geometric sizes. Subsequently, the applicability of typical design methods was evaluated, and a revised equation for determining strain εscy corresponding to ultimate strength was established to assess the plastic deformation capacity of CFHTST columns. Finally, a theoretical model for calculating Axial bearing capacity was derived based on unified twin-shear strength theory by considering the influence of intermediate principal stress. The research results indicate that a relatively high confine effect can be guaranteed for CFHTST columns under out-of-code D/t ratios, given that the ratio Nu/Nnom between the measured capacity (Nu) and nominal cross-sectional capacity (Nnom) mainly distributes within 1.179∼1.292; the full-range analysis reflects that the Axial load-deformation curve can be distinguished by four various loading stages; the scope b = 0.3∼0.55 of intermediate stress coefficient is generally suggested for predicting Axial strength of circular CFST columns within an error of ±5%. The abovementioned study can provide the meaningful design reference for the analysis and application of CFHTST columns
M H Lai - One of the best experts on this subject based on the ideXlab platform.
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a theoretical Axial stress strain model for circular concrete filled steel tube columns
Engineering Structures, 2016Co-Authors: M H LaiAbstract:Concrete-filled-steel-tube (CFST) columns are widely adopted in many structures nowadays attributed to the superior behaviour developed by the composite action. However, the composite action cannot be fully developed because of different dilation properties of steel tube and concrete in the elastic stage. Moreover, due to the inelastic outward buckling of steel tube, CFST columns may suffer serious degradation. To overcome these problems, external confinement, such as rings, ties, spirals and FRP wraps have been studied recently and proven experimentally to have potential in improving the uni-Axial behaviour of CFST columns. In this paper, an experimental database containing 422 uni-Axial Compression Test results of unconfined and externally confined CFST columns has been assembled. In addition, a theoretical model has been proposed for predicting the uni-Axial behaviour of circular CFST columns. This model consists of mainly three components: (1) Constitutive model of confined concrete modified from Attard and Setunge’s actively confined concrete model. (2) Constitutive model of steel tube under complex stress-state using Prandtl-Reuss theory. (3) The interaction among external confinement, steel tube and core concrete based on new a hoop strain equation. The validity of the proposed model has been verified by comparing the predicted results with the experimental database.
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uni Axial Compression Test of concrete filled steel tube columns confined by tie bars
Procedia Engineering, 2013Co-Authors: M H LaiAbstract:Concrete-filled-steel-tube (CFST) columns have been adopted due to its superior strength and ductility performance contributed by the composite action. However, this beneficial composite action cannot be fully developed at early elastic stage as steel dilates more than concrete and thereby causing imperfect interface bonding. Hence, it reduces the elastic strength and stiffness of the CFST columns. To resolve the problem, confinement in the form of tie bars is proposed in this study to restrict the lateral dilation of concrete and steel at initial elastic stage. In this paper, CFST columns of various dimensions, concrete strength and installed with tie bars were Tested under uni-Axial Compression. From the results, it was evident that: (1) Tie bars could increase the Axial load-carrying capacity (Maximum 16%; average, 5%) and decrease the strength degradation rate of CFST columns. (2) Tie bars were not effective in improving the elastic stiffness of CFST columns. (3) Tie bars were effective to limit the lateral deformation of the core concrete and the steel tube at the location of tie caps. However, the confining pressure decreased between tie caps at both horizontal and vertical planes.
