考虑应变率效应的钢筋混凝土框架结构弹塑性地震反应分析

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发布时间：2022-03-15

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：利用有限元软件 ABAQUS对钢筋混凝土框架结构构件中混凝土应变率进行了分析，将梁、
柱的弹塑性在应力一应变层次上进行模拟；研究了多维地震输入下应变率效应对钢筋混凝土框架结
构弹塑性地震反应的影响以及同一地震波不同峰值加速度下钢筋混凝土弹塑性地震反应的应变率
相关性，对比分析了考虑应变率与未考虑应变率下的弹塑性地震反应的差别。研究结果表明：框架
柱的应变率明显大于框架梁，并且上部构件的应变率小于下部构件，构件跨中截面的应变率小于端
部截面；考虑应变率效应时结构的位移反应、基底剪力和弯矩发生改变，峰值加速度较大的地震波
作用下应变率效应更为显著，应变率效应对钢筋混凝土框架结构弹塑性地震反应存在一定的影响，
尤其对强震下结构进行抗震分析时应适当予以考虑。
关键词：钢筋混凝土框架结构；应变率效应；弹塑性地震反应；有限元模型
中图分类号：TU311．3 文献标志码：A
Elastic—plastic Seism ic Response Analysis of Reinforced Concrete
Fram e Structure with Strain Rate Effect
ZHAN G H ao。I I H ong—nan
(Faculty of Infrastructure Engineering，Dalian University of Technology，Dalian 116024，I．iaoning，China)
Abstract：The strain rates of concrete in reinforced concrete frame structure members Were
analyzed by using finite element software ABAQUS．The beam and column element nonlinearity
was modeled in stress—strain relation leve1．Elastic—plastic seismic responses of reinforced concrete
frame structure with strain rate effect under m ulti—directional excitation were studied． The
seism ic responses with strain rate effects were analyzed under sam e seism ic wave and different
peak accelerations． The results with strain rate were compared with those without strain rate tO
study the difference in the elastic—plastic seismic response．The study results show that the strain
rates in beam elem ents are smaller than those in the column elem ents． The strain rate in the
elem ent iS smaller on upside， and it is also smaller in the section of the m id—span． The
displacem ent response，base shear and m oment of structure were changed when the strain rate
effects are taken into account． The strain rate effect under the stronger seism ic wave is more
prom inent．The elastic—plastic seism ic response of reinforced concrete frame structure is affected
by the strain rate． The strain rate effects should be considered properlv in the seism ic analysis