新型低损伤自复位混凝土框架节点试验及性能优化研究  

Experimental study and performance optimization of a novel low-damage self-centering concrete frame joint

作　　者：耿方方[1,2] 丁幼亮[2] 李亚东 刘威 GENG Fangfang;DING Youliang;LI Yadong;LIU Wei(Nanjing Institute of Technology,Nanjing 211167,Jiangsu,China;Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,Jiangsu,China;Henan University of Technology,Zhengzhou 450001,Henan,China;Shanghai Baoye Group Corp.,Ltd.,Shanghai 200941,China)

机构地区：[1]南京工程学院,江苏南京211167 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [3]河南工业大学,河南郑州450001 [4]上海宝冶集团有限公司,上海200941

出　　处：《地震工程学报》2023年第3期634-641,共8页China Earthquake Engineering Journal

基　　金：东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(CPCSME2020-03);江苏省自然科学基金面上项目(BK20221400)。

摘　　要：提出一种带可更换软钢阻尼器的低损伤自复预制混凝土(LDSCPC)框架节点,并针对该节点在地震作用下的抗震性能、更换阻尼器后的性能恢复等开展足尺试件的拟静力试验。在节点试验基础上,基于ABAQUS精细化有限元模型进行该节点关于螺栓预紧力、水平和竖向耗能条尺寸的参数化分析及优化设计。研究表明,软钢阻尼器LT12的滞回特性和承载能力是最优异的,而LT14是耗能最好的;增加阻尼器耗能条的尺寸和厚度能分别提高LDSCPC框架节点在加载早期和变形较大时的耗能性能。较大的螺栓预紧力能明显提升LDSCPC框架节点的耗能能力,当预紧力为155 kN时,软钢阻尼器几乎达到理想的耗能性能。In this paper,a low-damage self-centering precast concrete(LDSCPC)frame joint with a replaceable mild-steel damper was proposed.A series of pseudostatic tests on full-scale specimens were conducted to study the seismic performance of the joint under earthquakes and its performance recovery after replacing them with mild-steel dampers.Based on the test results,parametric analysis and design optimization of the bolt preload,as well as the horizontal and vertical energy dissipation strips of the joint,were performed using the ABAQUS refined finite element model.Results show that the hysteretic performance and bearing capacity of the mild-steel damper LT12,as well as the energy capacity of LT14,is superior.Increasing the size and thickness of the damper energy dissipation strips can improve the energy dissipation capacity of LDSCPC frame joints during the early stage of loading.A large bolt preload can significantly improve the energy dissipation capacity of LDSCPC frame joints.When the preload is 155 kN,the mild-steel damper can almost achieve the ideal energy dissipation performance.

关 键 词：软钢阻尼器 低损伤自复位 拟静力试验 优化设计 

分 类 号：P319.56[天文地球—固体地球物理学]