铁基形状记忆合金混凝土框架节点可恢复变形性能分析  

Resilient Performances Analysis of Fe-SMA Reinforced Frame Joints

作　　者：阎石[1] 杜长虹 肖正峰 蒋欣欣 牛健[1,2] YAN Shi;DU Changhong;XIAO Zhengfeng;JANG Xinxin;NIU Jian(School of Civil Engineering,Shengyang Jianzhu University,Shenyang 110108,Liaoning,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《地震研究》2020年第3期491-499,602,共10页Journal of Seismological Research

基　　金：国家重点研发计划(2018YFC0705602)资助.

摘　　要：罕遇地震作用下混凝土框架梁柱节点残余变形的不断累积是造成其破坏的主要原因之一,如何减小动力循环荷载作用下节点的残余变形,提升其可恢复变形能力具有重要的意义。利用超弹性铁基形状记忆合金(SMA)代替普通钢筋,不仅可使节点具有较大延性,还能保持较高耗能和可恢复变形能力。为了系统地分析新型节点的地震可恢复变形性能,利用OpenSEES系统平台建立一种相关节点的有限元模型,数值模拟普通配筋节点和铁基SMA筋节点模型在拟静力荷载作用下的内力和变形规律,并与试验结果进行比较;进一步分析了新型节点不同轴压比等参数下滞回性能,得到了极限承载力、刚度、阻尼、残余变形等变化规律,明确了可恢复变形性能。结果表明:所建立的模型能较好地反映新型节点的滞回性能和可恢复变形性能的变化规律,所提出SMA混凝土节点具有更好的抗震性能和可恢复地震变形能力,残余变形减小50%左右。The continuous accumulation of concrete frame structure beam-column joint residual deformations under major earthquakes is one of the main causes for structural destructions.How to reduce residual deformations of the beam-column joints under dynamic cyclic loading and improve their earthquake resilient performances(ERPs)is of great significance.Shape memory alloy(SMA)rebars with the superelasticity can replace ordinary rebars in beam-column joints in concrete frame structures to greatly increase the ductility while maintaining high energy dissipation capacity and high ERPs.In order to systematically analyze the seismic resilient deformation performance,the OpenSEES system platform is used to establish a finite element model(FEM)of corresponding joints,numerically simulating internal forces and deformation laws of ordinary beam-column joints and iron-based SMA beam-column joint under pseudo-static loading,and comparing with the test results.After the model updating,the hysteresis performances of the novel joints under different parameters such as compression ratios are further investigated,obtaining the law of the ultimate bearing capacity,stiffness,damping,residual deformation,and the resilient deformation capacity.The results show that the established model can better reflect the law of the hysteresis performances and resilient deformation capacity,and the proposed novel joint has better seismic performances and resilient deformation capacity as well as obviously reduced residual deformation than the normal joints.

关 键 词：铁基SMA框架节点 可恢复变形性能 超弹性 抗震性能 拟静力加载 残余变形 

分 类 号：TU375.4[建筑科学—结构工程] TU352