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K W Neale - One of the best experts on this subject based on the ideXlab platform.

  • modelling the bending behaviour of a new hybrid Glulam Beam reinforced with frp and ultra high performance concrete
    Applied Mathematical Modelling, 2012
    Co-Authors: Emmanuel Ferrier, Pierre Labossiere, K W Neale
    Abstract:

    Abstract The main objective of this research project to develop a new type of hybrid Glulam Beam that will increase the performance of a timber structural element by combining it with ultra-high-performance concrete with short fibre reinforcement (UHPC-SFR). The hybrid Beam is obtained is a layered structures obtained by combining a glued-laminated (Glulam) wood Beam with UHPC-SFR lamellae that is bonded to its top and bottom faces. The obtained hybrid Beam possesses a lower bending stiffness than a Glulam Beam of similar overall dimensions but has a higher ultimate load capacity. Two models that were developed to validate this concept are presented in this paper. The first is an analytical model based on hypotheses related to the usual strength of materials, and the second is a finite element model. The load–displacement and moment–curvature relationships from both models are compared to the experimental results obtained from the large-scale specimens. The results show good correlation between the analytical modelling and experimental results and illustrate the potential applications of such composite Beam configurations for civil engineering structures.

  • mechanical behavior of an innovative hybrid Beam made of Glulam and ultrahigh performance concrete reinforced with frp or steel
    Journal of Composites for Construction, 2010
    Co-Authors: Emmanuel Ferrier, Pierre Labossiere, K W Neale
    Abstract:

    The main objective of the research project reported here is to develop a new hybrid Glulam Beam that will increase the performance of timber structures and optimize the use of wood in such structures. The hybrid Beam is made by combining Glulam with ultrahigh-performance short fiber-reinforced concrete (UHPC-SFR) planks with or without internal reinforcement consisting of steel- or fiber-reinforced polymer reinforcement bars. This paper presents an experimental program of tests on eight large-scale hybrid Beams under four-point bending. The results show that by combining wood and UHPC-SFR, it is possible to obtain a hybrid Beam with greater bending stiffness and increased ultimate load capacity.

Emmanuel Ferrier - One of the best experts on this subject based on the ideXlab platform.

  • modelling the bending behaviour of a new hybrid Glulam Beam reinforced with frp and ultra high performance concrete
    Applied Mathematical Modelling, 2012
    Co-Authors: Emmanuel Ferrier, Pierre Labossiere, K W Neale
    Abstract:

    Abstract The main objective of this research project to develop a new type of hybrid Glulam Beam that will increase the performance of a timber structural element by combining it with ultra-high-performance concrete with short fibre reinforcement (UHPC-SFR). The hybrid Beam is obtained is a layered structures obtained by combining a glued-laminated (Glulam) wood Beam with UHPC-SFR lamellae that is bonded to its top and bottom faces. The obtained hybrid Beam possesses a lower bending stiffness than a Glulam Beam of similar overall dimensions but has a higher ultimate load capacity. Two models that were developed to validate this concept are presented in this paper. The first is an analytical model based on hypotheses related to the usual strength of materials, and the second is a finite element model. The load–displacement and moment–curvature relationships from both models are compared to the experimental results obtained from the large-scale specimens. The results show good correlation between the analytical modelling and experimental results and illustrate the potential applications of such composite Beam configurations for civil engineering structures.

  • mechanical behavior of an innovative hybrid Beam made of Glulam and ultrahigh performance concrete reinforced with frp or steel
    Journal of Composites for Construction, 2010
    Co-Authors: Emmanuel Ferrier, Pierre Labossiere, K W Neale
    Abstract:

    The main objective of the research project reported here is to develop a new hybrid Glulam Beam that will increase the performance of timber structures and optimize the use of wood in such structures. The hybrid Beam is made by combining Glulam with ultrahigh-performance short fiber-reinforced concrete (UHPC-SFR) planks with or without internal reinforcement consisting of steel- or fiber-reinforced polymer reinforcement bars. This paper presents an experimental program of tests on eight large-scale hybrid Beams under four-point bending. The results show that by combining wood and UHPC-SFR, it is possible to obtain a hybrid Beam with greater bending stiffness and increased ultimate load capacity.

Mingqian Wang - One of the best experts on this subject based on the ideXlab platform.

  • bolted Glulam Beam column connections under different combinations of shear and bending
    Engineering Structures, 2019
    Co-Authors: Mingqian Wang, Xiaobin Song, Jianyang Tang
    Abstract:

    Abstract Bolted Glulam Beam-column connections are often subjected to combined shear force and bending moment induced by the semi-rigid nature of such connections. This paper summarizes the results of a series of experimental and numerical studies on the mechanical behavior of such connections under various combinations of shear force and bending moment, defined by the shear-to-moment ratio λ . Monotonic loading tests, including pure bending tests (λ = 0), pure shear tests (λ = ∞), and combined shear and bending tests (λ = a limited value), were conducted. A three-dimensional finite element method based model was established, validated and used for a parametric study focusing on the influence of the shear-to-bending ratio on the combined load carrying capacity of the connections. The test results indicated that perpendicular to grain tensile splitting and parallel to grain shear splitting are the two major failure modes. The moment resistance decreased with the increase of the shear-to-bending ratio by up to 31.6% of the pure moment resistance, and the shear resistance decreased with the decrease of the shear-to-bending ratio by up to 46.1% of the pure shear resistance, implying a strong interaction between the shear force and the bending moment. Eventually, a quadratic interaction function was proposed for connections with the shear-to-moment ratio less than 1.53, otherwise a linear interaction function was proposed.

  • carbon fiber reinforced polymer reinforcement for rotational behavior of bolted Glulam Beam to column connections
    Journal of Composites for Construction, 2017
    Co-Authors: Xiaobin Song, Mingqian Wang
    Abstract:

    AbstractThis paper presents the results of an experimental study on the use of carbon fiber–reinforced polymer sheets as reinforcement for the rotational behavior of bolted Glulam Beam-to-column connections. Monotonic loading was applied on connection specimens to identify their stiffness, ductility, and maximum moment resistance values. Material property tests were conducted and used to provide an unbiased judgment of the reinforcing efficiency considering varied specimen qualities. Different sheet wrapping patterns and layers of sheets were examined, and the results were compared with each other and results from previous studies. It was found that carbon fiber–reinforced polymer sheets could improve the moment capacity of unreinforced connections by up to 59%, which is very close to the reinforcing ratio (65%) achieved by using locally cross-laminated Glulam members. A linear relationship was found between the increased perpendicular-to-grain Glulam tensile strength and the increased moment resistance b...

  • numerical simulation of rotational behavior of bolted Glulam Beam to column connections with slotted in steel plates
    Applied Mechanics and Materials, 2016
    Co-Authors: Mingqian Wang, Xiaobin Song
    Abstract:

    This paper presents the results of a numerical study on rotational behavior of bolted Glulam Beam-to-column connections. Since wood often exhibited complex failure behavior under different loading states, a three dimensional anisotropic damage analysis model of wood was initially developed based on continuum damage mechanics theory for progressive failure analysis of wood. The damage model basically consisted of two ingredients: the failure criterion proposed by Sandhaas was chosen to capture the damage onset; three independent damage variables were adopted to control the ductile and brittle damage evolution process of wood. This material model was implemented in a commercial available finite element method based code using a user-material subroutine. Finite element model of bolted connection coupled with the proposed material model was established to further investigate the failure modes and moment resistance of such connections. It was found that the damage evolution progress was very similar to the crack development from experimental tests. By comparing the experimental results and numerical predictions, a fair agreement of the initial stiffness and moment resistance was found with modeling error less than 3%, which implied that the finite element model was suitable to simulate the rotational behavior of such connections. This research could provide the reference for the design of bolted Glulam connections in heavy timber structures.

  • experimental study on rotational behavior of bolted Glulam Beam to column connections reinforced using cfrp sheets
    2014 International Conference on Mechanics and Civil Engineering (icmce-14), 2014
    Co-Authors: Mingqian Wang, Xiaobin Song, G U Xianglin, W U Yajie, Lie Luo
    Abstract:

    In this study, three groups of bolted Glulam Beam-to-column connections with slotted-in steel plates (in total 11 full-scale specimens) were tested under monotonic loading to investigate the rotational behavior of such connections with the use of carbon fiber reinforcing polymer sheets wrapping. The influence of CFRP sheet layers on the performance improvement of the connections was also quantified. The test results indicated that the maximum moments were increased by 14% and 18% for reinforced connections wrapped using 1 and 2 layers of CFRP sheets, respectively; furthermore, the deformability ratios evaluated based on the rotation angles corresponding to the yielding and maximum moments, respectively, were increased by 78% and 72%. It was also found that the variation of the maximum moment of reinforced connections can be reduced with increased layers of CFRP sheets.

Xiaobin Song - One of the best experts on this subject based on the ideXlab platform.

  • bolted Glulam Beam column connections under different combinations of shear and bending
    Engineering Structures, 2019
    Co-Authors: Mingqian Wang, Xiaobin Song, Jianyang Tang
    Abstract:

    Abstract Bolted Glulam Beam-column connections are often subjected to combined shear force and bending moment induced by the semi-rigid nature of such connections. This paper summarizes the results of a series of experimental and numerical studies on the mechanical behavior of such connections under various combinations of shear force and bending moment, defined by the shear-to-moment ratio λ . Monotonic loading tests, including pure bending tests (λ = 0), pure shear tests (λ = ∞), and combined shear and bending tests (λ = a limited value), were conducted. A three-dimensional finite element method based model was established, validated and used for a parametric study focusing on the influence of the shear-to-bending ratio on the combined load carrying capacity of the connections. The test results indicated that perpendicular to grain tensile splitting and parallel to grain shear splitting are the two major failure modes. The moment resistance decreased with the increase of the shear-to-bending ratio by up to 31.6% of the pure moment resistance, and the shear resistance decreased with the decrease of the shear-to-bending ratio by up to 46.1% of the pure shear resistance, implying a strong interaction between the shear force and the bending moment. Eventually, a quadratic interaction function was proposed for connections with the shear-to-moment ratio less than 1.53, otherwise a linear interaction function was proposed.

  • carbon fiber reinforced polymer reinforcement for rotational behavior of bolted Glulam Beam to column connections
    Journal of Composites for Construction, 2017
    Co-Authors: Xiaobin Song, Mingqian Wang
    Abstract:

    AbstractThis paper presents the results of an experimental study on the use of carbon fiber–reinforced polymer sheets as reinforcement for the rotational behavior of bolted Glulam Beam-to-column connections. Monotonic loading was applied on connection specimens to identify their stiffness, ductility, and maximum moment resistance values. Material property tests were conducted and used to provide an unbiased judgment of the reinforcing efficiency considering varied specimen qualities. Different sheet wrapping patterns and layers of sheets were examined, and the results were compared with each other and results from previous studies. It was found that carbon fiber–reinforced polymer sheets could improve the moment capacity of unreinforced connections by up to 59%, which is very close to the reinforcing ratio (65%) achieved by using locally cross-laminated Glulam members. A linear relationship was found between the increased perpendicular-to-grain Glulam tensile strength and the increased moment resistance b...

  • numerical simulation of rotational behavior of bolted Glulam Beam to column connections with slotted in steel plates
    Applied Mechanics and Materials, 2016
    Co-Authors: Mingqian Wang, Xiaobin Song
    Abstract:

    This paper presents the results of a numerical study on rotational behavior of bolted Glulam Beam-to-column connections. Since wood often exhibited complex failure behavior under different loading states, a three dimensional anisotropic damage analysis model of wood was initially developed based on continuum damage mechanics theory for progressive failure analysis of wood. The damage model basically consisted of two ingredients: the failure criterion proposed by Sandhaas was chosen to capture the damage onset; three independent damage variables were adopted to control the ductile and brittle damage evolution process of wood. This material model was implemented in a commercial available finite element method based code using a user-material subroutine. Finite element model of bolted connection coupled with the proposed material model was established to further investigate the failure modes and moment resistance of such connections. It was found that the damage evolution progress was very similar to the crack development from experimental tests. By comparing the experimental results and numerical predictions, a fair agreement of the initial stiffness and moment resistance was found with modeling error less than 3%, which implied that the finite element model was suitable to simulate the rotational behavior of such connections. This research could provide the reference for the design of bolted Glulam connections in heavy timber structures.

  • rotational behavior of bolted Glulam Beam to column connections reinforced with section steel
    Applied Mechanics and Materials, 2016
    Co-Authors: Yu Rong, Xiaobin Song, Lie Luo
    Abstract:

    Bolted connections with slotted-in steel plates are commonly used to connect Beams and columns in heavy timber structures. While due to the low tensile strength of wood in the perpendicular-to-grain direction, these connections are usually not able to present satisfying rotational performance. In order to solve this problem, a relatively new type of bolted connection, reinforced with section steel, was designed and tested in this paper. Two groups of total six specimens were tested under monotonic loading to investigate their rotational behavior. Tests showed that the brittle failure mode of wood splitting in the perpendicular-to-grain direction was fully restrained. Only slight cracks were observed in most specimens, except one that underwent bending failure in the Beam member. Test results indicated an average increase of 78.7% in moment resistance and a 54.8% increase in ductility ratio for middle-storey connections, compared with conventional connections simply using slotted-in steel plates. Top-storey connections, without previous test results as comparison, also presented high moment-bearing capacity and reliable deformability. As a result, such connection may receive a broad application, especially in multi-storey heavy timber structures.

  • experimental study on rotational behavior of bolted Glulam Beam to column connections reinforced using cfrp sheets
    2014 International Conference on Mechanics and Civil Engineering (icmce-14), 2014
    Co-Authors: Mingqian Wang, Xiaobin Song, G U Xianglin, W U Yajie, Lie Luo
    Abstract:

    In this study, three groups of bolted Glulam Beam-to-column connections with slotted-in steel plates (in total 11 full-scale specimens) were tested under monotonic loading to investigate the rotational behavior of such connections with the use of carbon fiber reinforcing polymer sheets wrapping. The influence of CFRP sheet layers on the performance improvement of the connections was also quantified. The test results indicated that the maximum moments were increased by 14% and 18% for reinforced connections wrapped using 1 and 2 layers of CFRP sheets, respectively; furthermore, the deformability ratios evaluated based on the rotation angles corresponding to the yielding and maximum moments, respectively, were increased by 78% and 72%. It was also found that the variation of the maximum moment of reinforced connections can be reduced with increased layers of CFRP sheets.

Yan Zhao - One of the best experts on this subject based on the ideXlab platform.

  • analysis of four types of anchorage devices for prestressed Glulam Beam and experimental research
    Materials, 2021
    Co-Authors: Nan Guo, Lidan Mei, Yan Zhao
    Abstract:

    An anchorage device is an integral part of the prestressed Glulam Beams. Therefore, its rationality and practicability have significant effects on the mechanical performance of the prestressed Beams. To investigate the impact of the anchorage devices on the bearing capacity and stiffness of the prestressed Beams, this paper compared and analyzed four kinds of anchors in detail through the finite element software. The results showed that when the initial mid-span deflection was 5 mm, 10 mm, and 15 mm, the bearing capacity of prestressed Beams with four anchorage devices was 80.37–177.24%, 93.56–182.51%, and 95.62–194.60% higher than that of ordinary Glulam Beam, respectively. When the initial mid-span top prestresses were 1 MPa, 1.5 MPa, and 2 MPa, the bearing capacity of prestressed Beams with four anchorage devices was 101.71–172.57%, 105.85–175.88%, and 109.64–180.87% higher than that of ordinary Glulam Beam, respectively. In addition, based on the simulation results, the prestressed Beam with the external anchorage had the highest bearing capacity and stiffness. The deformation capacity of the Beam with boot anchorage was the largest. The stress distribution of the Beam installed under Beam anchorage was the most uniform, and the Beam with slotted anchorage was easy to cause stress concentration at the notch. Finally, based on the outstanding performance of the external anchorage, it was selected to carry out one experiment, and the experimental result showed that the simulation could predict the damage model and load–deflection relationship of the prestressed Beams well.

  • experimental study on flexural performance of regulated reinforced Glulam Beam after long term loading
    Sustainability, 2021
    Co-Authors: Nan Guo, Chao Yang, Yan Zhao
    Abstract:

    Due to wood creep characteristics, the failure mode, bearing capacity, stiffness, and deformation of its components are doomed to be impacted by long-term loading. This paper conducted a comparative test on creep Beams, regulated Beams, and short-term Beams based on the former long-term loading research. The results demonstrated that the Glulam Beam experienced tensile failure of the Beam-bottom, while the horizontal joint failure and the local compressive failure of the Beam-end happened in the reinforced Glulam Beam and the prestressed Glulam Beam. The bearing capacity of the creep Beams decreased compared with that of the short-term Beams; the decline in the bearing capacity of the ordinary Glulam Beams, the reinforced Glulam Beams, and the prestressed Glulam Beams ranged from 3.2% to 9.8%, from 1.6% to 13.2%, and from 2.9% to 9.2%, respectively. However, the bearing capacity of the regulated Beam with the deformation restored to the initial value of the load increased by 4.6–14.1%. The prestressed regulation changed the distribution of the stress on the Beam and thus enhanced its bearing capacity. The findings of this work could be used as a frame of reference for similar components in engineering applications.

  • Study on flexural performance of prestressed Glulam continuous Beams under control influence
    'Springer Science and Business Media LLC', 2021
    Co-Authors: Lidan Mei, Nan Guo, Hongliang Zuo, Yan Zhao
    Abstract:

    Abstract Traditional Glulam Beam connection mode has a weak ability to transfer bending moment, leading to insufficient joint stiffness and mostly in the form of simply supported Beams. To make full use of material strength, a novel prestressed Glulam continuous Beam was proposed. On this basis, this paper put forward a new method to further improve the mechanical performance of the Beams by controlling prestress. According to the estimated ultimate loads of the Beams, six different control range values were formulated, and 12 continuous Beams were tested for flexural performance. The effects of prestressing control on the failure modes, ultimate load capacity, and load versus deformation relationships of the Glulam continuous Beams were analyzed. The test results indicated that the flexural performance of the Beams with prestressed control was significantly improved compared to the uncontrolled Beams, the ultimate load was enhanced by 13.60%–45.11%, and the average steel wire stress at failure was increased from 70% of the designed tensile strength to 94%. Combined with the finite element analysis (FEA), the reasonable control range of the prestressed control continuous Beams was18%–30% of the estimated ultimate load. The research in this paper can provide references for the theoretical analysis and engineering application of similar structures