Elongation in Ductile Seismic-Resistant Reinforced Concrete Frames

R. Fenwick, B. Davidson
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引用次数: 27

Abstract

To survive a major earthquake, current practice requires seismic resistant frames to be designed to be ductile. To achieve the required level of ductility in multi-storey frames, the majority of the potential plastic hinge zones are located in the beams. The inelastic rotation, which may develop in these zones, arises predominantly from the tensile yielding of the reinforcement. The associated compressive strains are small and as a consequence elongation occurs. Test results show that elongations of the order of 2 to 4 percent of the member depth develop in plastic hinge zones of beams subjected to cyclic loading before strength degradation occurs. The factors influencing elongation are reviewed. The results of a time history analysis, in which elongation effects are modeled, shows that this action, which is neglected in current design practice, has important implications for the detailing of columns and the design of supports for precast components and external cladding.
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延性抗震钢筋混凝土框架的伸长率
为了在大地震中幸存下来,目前的实践要求抗震框架的设计具有延展性。为了在多层框架中达到所需的延性水平,大多数潜在的塑性铰区域位于梁中。在这些区域可能发生的非弹性旋转主要是由钢筋的拉伸屈服引起的。相关的压缩应变很小,因此发生伸长。试验结果表明,在循环荷载作用下,梁的塑性铰区在强度退化之前会出现构件深度的2%至4%的伸长。综述了影响延伸率的因素。在对伸长率效应进行建模的时程分析结果表明,这种在当前设计实践中被忽视的作用,对柱的详细设计以及预制件和外部包层的支撑设计具有重要意义。
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Japanese PRESSS Design Guidelines for Reinforced Concrete Buildings Anchorage of Beam Bars with 90-deg Bend in Reinforced Concrete Beam-Column Joints Elongation in Ductile Seismic-Resistant Reinforced Concrete Frames Empirical Versus Rational Approach in Structural Engineering--What We Learned from New Zealand in the Trilateral cooperative research on beam-column joints The Philippines Earthquake of July 1990--Lessons for us all from the Destruction and Reconstruction
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