摘要
提出角钢耗能自复位混凝土框架设计方法,建立节点的有限元数值模型,并试验验证其有效性。对抗弯承载力比φdes预应力筋不同的节点进行模拟分析,研究其在地震作用下的自复位性能、耗能能力和材料损伤等性能指标。为提高该类节点耗能能力,通过改变角钢竖肢螺杆标距做进一步研究。结果表明:角钢耗能节点具有良好的自复位性能,但耗能能力不足;减小抗弯承载力比φdes,自复位能力降低、残余变形加大,但耗能能力增强。与混合连接节点相比,应适当降低节点抗弯承载力比φdes的最低取值,以弥补其耗能能力的不足。角钢竖肢塑性变形是节点的主要耗能方式,且集中在竖肢的螺栓孔高度和竖肢转角位置;减小竖肢螺杆标距,且保持材料其他参数不变,将导致抗弯承载力比φdes减小、截面抗弯承载力提高,节点耗能能力将随之增强。
Design method was proposed for self-centering concrete frame joints with energy-dissipation angle steel in this study.Finite element numerical model was established and its validity was verified by experiments.After the joints with different prestressed moment capacity ratiosφdes were simulated,the energy dissipation capacity,self-centering performance and material damage under earthquake were studied.Changing the screw gauge distance of angle vertical leg,the measures to improve its energy-consumption capacity were further explored.The results show that the angle energy-consuming joints have perfect self-centering performance,but the energy consuming capacity is slightly insufficient.As the value ofφdes decreases,the residual deformation increases and the self-centering ability decreases,but the energy dissipation capacity increases.Therefore,compared with the hybrid connection joint,the minimumφdes value of joint should be appropriately reduced to make up for its insufficient energy dissipation.The plastic deformation of the angle vertical leg is the main energy dissipation mode of the joint,concentrating on the height of the bolt hole and the turning of the vertical leg.If the distance between the vertical screws is reduced and the other material parameters keeps constant,it will lead to decrease inφdes values,increase of the bending capacity of the section and growth of the energy dissipation capacity of the joint.
作者
贺成
简斌
吴昕
吴盼
HE Cheng;JIAN Bin;WU Xin;WU Pan(Dongguan Daye Construction Drawings Review Co.,Ltd.,Dongguan 523000,Guangdong,P.R.China;School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2023年第3期90-98,共9页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51878100)。
关键词
混凝土框架
自复位节点
角钢耗能
数值模拟
抗震性能
concrete frame
self-centering joint
energy-dissipation of angle steel
numerical simulation
seismic performance
