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Elasto-plastic Earthquake Response of Reinforced Concrete Structure subjected to Bi-directional Horizontal and Vertical Motion

水平和垂直双向运动下钢筋混凝土结构的弹塑性地震响应

基本信息

批准号：
12650562
负责人：
SHIOHARA Hitoshi
金额：
$ 2.18万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The objective of this project is to investigate the nonlinear earthquake responce of reinforced concrete structure subjected to bidirectional horizontal motion and vertical motion by numerical study with analytical tools. The result of this project is briefly described as follows,A. Development of restoring force model considering sfrain rate effectsThe strain rate in materials consist of the reinforcad concrete structures responding to an earthquake excitation, changes in rapid rate due to random nature of the earthquake excitation. However little attention have not been paid to the effect of strain rate. The yield point of steel changes according to the strain rate and may alter the earthquake response of structures. Hence, this study developed a new constitutive model taking into account the effect of strain rate, which is available for esast-plastic earthquake response analysis by step-by-step integration of equation of motion. Using the model, earthquake response of a single-degre … More e-of-freedom system was calculated. From the comparison of the earthquake response, It is revealed that in most case, the earthquake response with strain rate effect considered consumes larger total amount of energy than the model neglecting the strain rate effect, while the maximum response increase or reduce depending on each case and no consistent tendency was not observed.B. Effect of floor vibration due to vertical motion to horizontal responseNonlinear earthquake response of multi-storied reinforced concrete buildings were carried out with flame model with non-linear spring representing the behavior of framing member and floor slab, to investigate the effect varying axial force in column due to floor slab vibration.C. Development of simplified procedure estimating maximum story drift response in muti-storied buildings with excitation of higher viblration modesNonlinear frame earthquake response analyzes were carried our to investigate the maximum story drift response in mid-to-high multi-storied buildings subjected to wide spectrum of artificial base motions with different Fourier phase properties and different target maximum acceleration response spectrum curves. The major parameters correlating to the shape of the envelope curve of maximum story drift include the relation of natural period of each mode and the shape of target shape of maximum response spectrum. (a) Provided natural period of a building is shorter than the eminent period of base excitaion, the profile of the envelope curve for maximum story drift is prominent at lower stories, while (b) natural period of a building is longer, the profile of the envelope curve is prominent at higher stories. However, not only the target maximum response spectrum but also the Fourier phase properties also showed significant effects on the profile in some case. No conclusive remarks relating to the effect of the Fourier phase characteristics was drawn by this study. Less

本课题的目的是用数值分析的方法研究钢筋混凝土结构在双向水平运动和竖向运动作用下的非线性地震反应。本项目的成果简述如下：A.考虑裂变率影响的恢复力模型的建立材料中的应变率由钢筋混凝土结构对地震激励的响应组成，由于地震激励的随机性，材料的应变率发生快速变化。然而，应变率的影响一直没有引起足够的重视。钢的屈服点随着应变率的变化而变化，可能会改变结构的地震反应。为此，本文提出了一种考虑应变率影响的本构模型，该模型可用于运动方程逐步积分的弹塑性地震反应分析。利用该模型对单度…的地震反应进行了分析。计算了更多的e自由度系统。结果表明，考虑应变率效应的地震反应在大多数情况下比不考虑应变率效应的地震反应消耗的总能量更大，但最大反应的增减并不一致。b.楼板竖向运动振动对水平地震反应的影响为了研究楼板振动对柱子轴力变化的影响。c.开发了高层建筑高阶振型激励下最大层间位移反应的简化计算程序。采用非线性框架地震反应分析方法，研究了不同傅立叶相位特性和不同目标最大加速度反应谱曲线下，中高层多层建筑在宽谱人工地震动作用下的最大层间位移反应。与最大楼层位移包络曲线形状相关的主要参数包括各振型的自振周期关系和最大反应谱目标形状的关系。(A)如果建筑物的自振周期短于基础激振的显著周期，则最大楼层位移的包络曲线轮廓在较低层突出，而(B)建筑物的自振周期较长，包络曲线轮廓在较高层突出。然而，在某些情况下，不仅目标的最大响应谱，而且傅立叶相位特性也对轮廓有显著的影响。本研究并未对傅立叶位相特性的影响得出结论。较少