一种新型自复位耗能抗震支吊架参数分析

Parameter Analysis of a New Type of Self-centering Energy Dissipative Seismic Supports and Hangers

为解决传统抗震支吊架采用“硬抗”的方式抵抗地震作用的问题,并减小传统抗震支吊架的震后残余变形,提出一种新型自复位耗能抗震支吊架。采用ABAQUS有限元软件分别对自复位耗能抗震支吊架和传统抗震支吊架进行有限元模拟,对比分析二者的应力及变形特性、滞回性能来验证所提自复位耗能抗震支吊架的抗震性能;通过建立不同参数的支吊架模型并对滞回性能进行参数分析,得到抗震斜撑复位比、刚度比和摩擦系数对自复位耗能抗震支吊架滞回性能的影响规律,并给出相应参数的取值建议;以支吊架响应峰值加速度作为工程需求参数,以支吊架破坏作为损伤极限状态,得到两种抗震支吊架的易损性曲线。结果表明:抗震斜撑复位比、刚度比和摩擦系数的取值范围分别为1.0~1.5、1.0~1.5和0.1~0.3时,自复位耗能抗震支吊架具有较好的滞回特性;新型自复位耗能抗震支吊架具有更强的鲁棒性,能够更好地保障管道系统的使用功能。

In order to solve the problem that the traditional seismic supports and hangers adopt the“hard resistance”method to resist the earthquake action and reduce the residual deformation of the traditional seismic supports and hangers after the earthquake,a new type of self-centering energy dissipative seismic supports and hangers(SESH)is proposed in this paper.The finite element software ABAQUS is used to simulate the SESH and the traditional seismic supports and hangers.The stress and deformation characteristics and hysteretic performance of the two kinds of supports and hangers are compared and analyzed,so as to verify the seismic performance of the proposed SESH.Supports and hangers models with different parameters are established.By analyzing hysteretic performance parameters,the influence laws of seismic inclined brace reset ratio,stiffness ratio and friction coefficient on hysteretic performance of SESH were obtained,and the value suggestions of the above parameters were given.The peak response acceleration of the supports and hangers is taken as the engineering demand parameter,and the failure state of the supports and hangers is taken as the damage limit state.The vulnerability curves of two kinds of seismic supports and hangers are obtained.The results show that the SESH have good hysteretic characteristics when the seismic inclined brace reset ratio,stiffness ratio and friction coefficient are 1.0~1.5,1.0~1.5 and 0.1~0.3,respectively.The new SESH has stronger robustness and can better ensure the function of pipeline system.