多层钢筋混凝土平面框架拟动力抗震性能有限元分析  

Finite Element Analysis of Pseudo-dynamic Performance of Steel Reinforced Concrete Plane Frame Structure

作　　者：吕辉 肖冲 罗靓 LV Hui;XIAO Chong;LUO Liang(College of Civil Engineering and Architecture,Nanchang Hangkong University,Nanchang 330063,China;Jiangxi Smart Building Engineering Research Center,Nanchang 330063,China)

机构地区：[1]南昌航空大学土木建筑学院,江西南昌330063 [2]江西省装配式建筑与智能建造重点实验室,江西南昌330063

出　　处：《灾害学》2023年第4期63-70,共8页Journal of Catastrophology

基　　金：2022国家自然科学基金“异形钢管混凝土柱-组合框架结构体系抗震耗能及损伤定量评估”(52268031)。

摘　　要：利用ABAQUS软件对3层2跨钢筋混凝土平面框架拟动力试验进行建模分析,建模时充分考虑了混凝土与纵筋、箍筋及型钢的约束关系、合理的地震波输入机制及平面框架的结构阻尼。通过对比有限元中的位移、加速度时程结果与试验结果,两者差异较小,表明建模方法的合理性,并进一步深入分析了该平面框架震后梁柱混凝土的结构损伤、各部件的应力-应变关系、梁柱控制点处的弹塑性状态以及塑性耗能机理与塑性耗能分配机制。结果表明:7种幅值El Centro波作用下,框架梁、柱混凝土均已开裂,柱底混凝土被压碎,纵筋、箍筋、型钢都进入塑性状态;按构件区分,框架梁的塑性耗能占比大于框架柱;按材料区分,梁、柱钢筋是平面框架的主要耗能部件,混凝土次之,型钢耗能占比较小;采用的建模方法可高效准确地模拟平面框架的拟动力性能,可为后续的实际工程作参考。The ABAQUS software is used to model and analyze the pseudo-dynamic test of a 3-story,2-span reinforced concrete plane frame.The constraint relationship between concrete and longitudinal reinforcement,stirrup and section steel,reasonable seismic wave input mechanism and structural damping of the plane frame are fully considered in the modeling.By comparing the displacement and acceleration time-history results in the finite element method with the test results,the difference between the two is small,which indicates the rationality of the modeling method.The structural damage of the beam-column concrete after the earthquake,the stress-strain relationship of each component,the elastic-plastic state at the beam-column control point,the plastic energy dissipation mechanism and the plastic energy dissipation distribution mechanism are further analyzed.The research shows that under the action of seven amplitude El Centro waves,the concrete of frame beam and column has cracked,the concrete at the bottom of column has been crushed,and the longitudinal reinforcement,stirrup and section steel have entered the plastic state;According to the components,the plastic energy consumption of frame beams is larger than that of frame columns;According to the material,the beam and column reinforcement are the main energy-consuming components of the plane frame,followed by concrete,and the energy consumption of section steel is relatively small;The modeling method adopted can effectively and accurately simulate the pseudo-dynamic performance of the plane frame,which can be used as a reference for subsequent practical.

关 键 词：钢筋混凝土平面框架 拟动力 抗震性能 结构损伤 有限元分析 

分 类 号：X43[环境科学与工程—灾害防治] X915.5[天文地球—地震学] P315.5[天文地球—固体地球物理学] TU391[天文地球—地球物理学]