基于纤维梁柱单元的墩柱弹塑性性能数值分析模型  

Fiber Beam-Column Element-Based Numerical Model for Elastoplastic Performance Analysis of Column

作　　者：王孟欣 王靖程 叶爱君[1] WANG Mengxin;WANG Jingcheng;YE Aijun(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《结构工程师》2024年第3期22-28,共7页Structural Engineers

基　　金：国家自然科学基金面上项目(52178155)。

摘　　要：基于OpenSees开源平台,采用基于位移的纤维梁柱单元和零长度单元,建立了考虑钢筋混凝土墩柱塑性弯曲变形和粘结滑移效应的滞回推覆(Pushover)分析有限元模型,分析了塑性铰区单元长度对墩柱弹塑性性能数值模拟结果的影响,探讨了单元长度的合理取值,最后,基于美国PEER结构试验数据库中3个弯曲破坏的钢筋混凝土悬臂墩的拟静力试验结果,验证了数值模型的正确性。结果表明:采用基于位移的梁柱单元模拟钢筋混凝土墩柱弹塑性性能时,塑性铰区单元长度对其最大水平抗力和位移延性都有显著的影响;合理单元长度为等效塑性铰长度,而等效塑性铰长度可以采用Priestley等提出的经验公式计算。Based on the OpenSees platform,a finite element model consisting of displacement-based beamcolumn elements and zero-length elements is developed for cyclic pushover analysis of columns,considering the plastic flexural deformation and bond-slip effect.The influence of the element length for the plastic region on the elastoplastic performance of columns is analyzed,and the reasonable element length is discussed.Finally,the numerical model is validated based on the quasi-static tests of three reinforced concrete cantilever columns with flexural failures in the PEER structural test database.The results show that the length of the displacement-based beam-column element in the plastic region has significant effects on the horizontal strength and displacement ductility of the column.The reasonable element length should be equal to the equivalent plastic hinge length,which can be calculated using the empirical formula proposed by Priestley et al.

关 键 词：钢筋混凝土墩柱 弹塑性性能 基于位移的梁柱单元 塑性铰区单元长度 等效塑性铰长度 

分 类 号：U441[建筑科学—桥梁与隧道工程]