The Experts below are selected from a list of 13617 Experts worldwide ranked by ideXlab platform
Shwan H Said - One of the best experts on this subject based on the ideXlab platform.
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structural behavior of rc engineered cementitious composite ecc exterior beam Column Joints under reversed cyclic loading
Construction and Building Materials, 2016Co-Authors: Shwan H Said, Hashim Abdul RazakAbstract:Abstract This paper investigates the effects of engineered cementitious composite (ECC) on the behavior of RC exterior beam–Column Joint under reversed cyclic loading. The main parameters considered include the load–deflection relationship, crack propagation, moment–rotation relationship at the Joint, and energy absorption capacity. The experimental work was conducted on a normal concrete and an ECC full scale RC exterior beam–Column Joint. The specimen was subjected to reverse cyclic loading under controlled deformation at the tip of the beam until failure. At post cracking stages, the ECC Joint showed significant improvement in the ultimate shear and moment capacities, as well as in the deformation behavior and damage tolerance, compared with the NC specimen at ultimate and failure stages. Numerous tiny cracks with reduced crack width and spacing forming a dense of network propagated within the Joint region.
M H Shih - One of the best experts on this subject based on the ideXlab platform.
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Reinforced concrete beam-Column Joint strengthened with carbon fiber reinforced polymer
ELSEVIER SCI LTD, 2020Co-Authors: M H ShihAbstract:[[abstract]]An effective rehabilitation strategy is proposed to enhance the strength and stiffness of the beam-Column Joint in this study. An analytical model is proposed to predict the Column shear of the Joints strengthened with carbon fiber reinforced polymer (CFRP). Three full scale interior beam-Column Joints, including two specimens strengthened with CFRP and one prototype specimen, are tested in this study. The specimens are designed to represent the pre-seismic code design construction in which there is no transverse reinforcement. A new optical non-contact technique, digital image correlation (DIC), which can measure the full strain field of specimen, is used to measure and observe the full strain field of the Joint. The experimental results show that the beam-Column Joints strengthened with CFRP can increase their structural stiffness, strength, and energy dissipation capacity. The rehabilitation strategy is effective to increase the ductility of the Joint and transform the failure mode to beam or delay the shear failure mode. By observing the measured results, it is found that the mechanical anchorages can prevent the debonding of CFRP. Comparing the analytical and experimental results, the proposed model can accurately predict the Column shear and shear strength of the Joints strengthened with CFRP. (C) 2009 Elsevier Ltd. All rights reserved.[[note]]SC
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reinforced concrete beam Column Joint strengthened with carbon fiber reinforced polymer
Composite Structures, 2010Co-Authors: Weite Lee, Yawjeng Chiou, M H ShihAbstract:Abstract An effective rehabilitation strategy is proposed to enhance the strength and stiffness of the beam–Column Joint in this study. An analytical model is proposed to predict the Column shear of the Joints strengthened with carbon fiber reinforced polymer (CFRP). Three full scale interior beam–Column Joints, including two specimens strengthened with CFRP and one prototype specimen, are tested in this study. The specimens are designed to represent the pre-seismic code design construction in which there is no transverse reinforcement. A new optical non-contact technique, digital image correlation (DIC), which can measure the full strain field of specimen, is used to measure and observe the full strain field of the Joint. The experimental results show that the beam–Column Joints strengthened with CFRP can increase their structural stiffness, strength, and energy dissipation capacity. The rehabilitation strategy is effective to increase the ductility of the Joint and transform the failure mode to beam or delay the shear failure mode. By observing the measured results, it is found that the mechanical anchorages can prevent the debonding of CFRP. Comparing the analytical and experimental results, the proposed model can accurately predict the Column shear and shear strength of the Joints strengthened with CFRP.
Laura N Lowes - One of the best experts on this subject based on the ideXlab platform.
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evaluation calibration and verification of a reinforced concrete beam Column Joint model
Journal of Structural Engineering-asce, 2007Co-Authors: Nilanjan Mitra, Laura N LowesAbstract:A model for use in simulating the response of reinforced concrete interior beam-Column Joints is developed and evaluated using an extensive experimental data set. This model builds on previous work by Lowes and Altoontash in 2003, modifying the previously proposed model to improve prediction of response and extend the range of applicability. First, a new element formulation is proposed to improve simulation of Joint response mechanisms. Second, a new method for simulating the shear stress-strain response of the Joint core is developed. This method assumes Joint shear is transferred through a confined concrete strut and simulates strength loss due to load history and Joint damage following yielding of beam longitudinal steel. Third, modifications are made to enable better simulation of anchorage zone response. Comparison of simulated and observed response histories indicates that the new model represents well stiffness and strength response parameters for Joints with a wide range of design parameters.
Hashim Abdul Razak - One of the best experts on this subject based on the ideXlab platform.
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structural behavior of rc engineered cementitious composite ecc exterior beam Column Joints under reversed cyclic loading
Construction and Building Materials, 2016Co-Authors: Shwan H Said, Hashim Abdul RazakAbstract:Abstract This paper investigates the effects of engineered cementitious composite (ECC) on the behavior of RC exterior beam–Column Joint under reversed cyclic loading. The main parameters considered include the load–deflection relationship, crack propagation, moment–rotation relationship at the Joint, and energy absorption capacity. The experimental work was conducted on a normal concrete and an ECC full scale RC exterior beam–Column Joint. The specimen was subjected to reverse cyclic loading under controlled deformation at the tip of the beam until failure. At post cracking stages, the ECC Joint showed significant improvement in the ultimate shear and moment capacities, as well as in the deformation behavior and damage tolerance, compared with the NC specimen at ultimate and failure stages. Numerous tiny cracks with reduced crack width and spacing forming a dense of network propagated within the Joint region.
E Emami - One of the best experts on this subject based on the ideXlab platform.
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cyclic performance of retrofitted reinforced concrete beam Column Joints using steel prop
Construction and Building Materials, 2012Co-Authors: Kazem M Sharbatdar, Ali Kheyroddin, E EmamiAbstract:Abstract This paper investigates the cyclic experimental behavior of damaged exterior reinforced concrete beam–Column Joint specimens retrofitted with the proposed technique using steel elements called steel prop and curb. The technique is usable for local and global strengthening of reinforced concrete frames. Four half-scale RC Joints were tested under the cyclic loading; two control specimens with the different beam heights were loaded up to their ultimate strength and this was followed by retrofitting of these damaged specimens as new specimens and tested again under the same loading system. Experimental results showed that the 25% reduction of beam height due to construction mistake caused increasing in deflection of Joint beam, decreasing of ductility and also 33% and 26% decreasing in bearing capacity and energy absorption, respectively. The ultimate load was increased up to 80% and the rigidity decreased degradation of retrofitted damaged Joints was significantly in the proposed retrofitting system. And also the energy absorption was enhanced and the cracks were minimized due to a new lateral loading in the beam–Column Joint region in this upgrading method.