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首页> 外文会议>Fourth International Conference on Earthquake Resistant Engineering Structures (ERES IV) 2003 Ancona >Plastic energy dissipation and ductility of symmetric reinforced and over-reinforced RC elements' sections
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Plastic energy dissipation and ductility of symmetric reinforced and over-reinforced RC elements' sections

机译：对称钢筋混凝土构件和超钢筋混凝土构件的塑性耗能和延展性

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摘要

It is clear today that the existing spectral-acceleration based the seismic design method has several limitations. First of all, it does not into account the cumulative plastic deformation demands in earthquake resistant structure. The important factors that affect the RC section plastic energy dissipation (PED) and ductility are symmetric reinforcing of the section and over-reinforcing. The purpose of this paper is to propose the method of the calculation of RC element PED and its ductility taking into account the variety of the section reinforcement. The alternating direction of the seismic force at each second half cycle leads to corresponding changes of stress values and signs in the reinforcement. Thus, the compressive zone is periodically over-reinforced and the tensile one is poorly reinforced. In this case, the reinforcement cannot contribute to the section PED, and ductility of the section decreases significantly. This is the main cause of RC element failure under strong earthquakes in seismic zones. The compression zone of a symmetric reinforced section undergoing large-eccentric compression acts as under axial compression, and there is no redistribution of the internal forces in such a section. This is the main cause of a compressed element failure under strong earthquakes, since RC columns in the seismic zone usually have symmetric reinforcement. Nevertheless, symmetric reinforcement is necessary as a result of the alternating direction of the seismic forces. The PED and ductility factor calculation methodology, given in this paper, can be used for RC structures seismic design codes.
机译：今天很明显，基于地震设计方法的现有频谱加速度具有一些局限性。首先，它没有考虑抗震结构中累积的塑性变形需求。影响RC型材塑性能耗散（PED）和延展性的重要因素是型材的对称加固和过度加固。本文的目的是考虑截面钢筋的变化，提出钢筋混凝土单元PED的计算方法及其延性。在每个后半个周期中，地震力的交替方向会导致钢筋中应力值和符号的相应变化。因此，压缩区被周期性地过度加固，而拉伸区则加固不良。在这种情况下，增强材料无法促进截面PED，并且截面的延展性显着降低。这是在地震带强烈地震下钢筋混凝土元件失效的主要原因。经受大偏心压缩的对称增强型截面的压缩区的作用与轴向压缩相同，并且在这种截面中没有内力的重新分布。这是在强地震下压缩元件失效的主要原因，因为地震带中的RC柱通常具有对称的钢筋。然而，由于地震力的交替方向，对称的加固是必要的。本文给出的PED和延性因子计算方法可用于RC结构抗震设计规范。

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