Experimental and Analytical Research on Deterioration Diagnosis and Earthquake-resistant Reinforcement of RC Members

2005学年的研究项目和成果如下：（1）含内部缺陷棱柱形混凝土受压破坏的有限元分析（2）箍筋断裂时钢筋混凝土构件峰后性能的分析研究（3）模拟ASR破坏的钢筋混凝土梁受弯性能的试验研究（4）盐害破坏钢筋混凝土构件抗震性能的研究（5）受弯破坏钢筋混凝土梁修复性能的试验研究对钢筋混凝土梁的极限承载力和峰后性能的影响进行了分析研究。同时，本文还对混凝土梁进行了模拟ASR和盐害内部缺陷的试验研究。本文还对钢筋混凝土梁进行了弯曲破坏试验，获得了可用于钢筋混凝土构件损伤评估的数据，并对国内外的研究项目和成果进行了综述。 ...更多信息 c 2006年的情况如下：（1）钢管混凝土轴压弯曲变形柱内部状态的三维有限元分析（2）单轴受压约束混凝土内部约束状态的分析研究（3）含内部缺陷钢筋混凝土柱的承载力研究（4）盐害钢筋混凝土构件的承载力研究对钢管混凝土柱在轴压恒定荷载和侧向单调荷载作用下的三维有限元变形分析，对钢管混凝土柱的峰后受力性能以及钢管混凝土柱对混凝土的约束作用进行了研究。通过模拟混凝土内部缺陷的试验研究，总结了混凝土内部缺陷对构件最大承载力和峰后性能的影响，认为混凝土内部缺陷对核心混凝土的约束作用减弱是导致构件最大承载力和峰后性能降低的主要原因。因此，对抗震加固的研究，以增加钢筋混凝土构件内部的约束效应可能是进一步的目标。少

The research items and results from the academic year 2005 are as follows :(1) FEM Analyses on Compressive Failure of Prismatic Concrete with Internal Defect(2) Analytical Research on Post-peak Behavior of RC Members with the Breaking of Hoop Tie(3) An Experimental Study on Flexural Behavior of RC Beam simulating the Deterioration by ASR(4) Research on Earthquake-resistance of RC Members deteriorated by Salt Damage(5) An Experimental Study on Evaluating the Repair Performance of RC Beams failing in FlexureThe influences of internal defects, such as rock-pocket and breaking of hoop tie, on the ultimate strength and post-peak behavior of RC beams have been investigated analytically. Also, Experimental study has been carried out on RC beams simulating the internal defects due to ASR and salt damage. Furthermore, the flexural failure experiment on RC beams has been done to obtain the data, which can be used for damage evaluation of RC members.The research items and results from the academi … More c year 2006 are as follows :(1) 3-D FEM Analyses on Internal State inside the Concrete Filled Steel Tubular Columns subjected to Flexural Deformation under Axial Loading(2) Analytical Study on Confining Condition inside Confining Concrete subjected to Uniaxial Compression(3) A Study on Load Carrying Capacity of RC Column with Internal Defect(4) Research on Load Carrying Capacity of RC Members Deteriorated by Salt Damage3-D finite element deformation analyses on the CFT steel columns, which are subjected to constant axial loading and lateral monotonic loading, have been carried out to investigate the post-peak behavior of the CFT steel columns as well as confining effect on concrete from the steel tubular columns. In similar manner, experimental study has been carried out on RC beams simulating the internal defects due to ASR and salt damage.Summarizing the present research, it can be concluded that the reduction in maximum strength as well as the post-peak behavior of RC member with the internal defects could be related to the reduction in confining effect on core concrete. Therefore, study on the earthquake-resistant reinforcement to increase the confining effect inside RC members may be further target. Less