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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年01期

页码:

103-114

栏目:

建筑结构

出版日期:

2024-01-20

文章信息/Info

Title:

Seismic fragility analysis of new layered assembled joint in steel frame

文章编号:

1673-2049(2024)01-0103-12

作者:

褚云朋^1,2,肖雅馨²,罗 萍²,钟 燕²,陈雪琴²

(1. 西南科技大学 工程材料与结构冲击振动四川省重点实验室,四川 绵阳 621010; 2.西南科技大学 土木工程与建筑学院,四川 绵阳 621010)

Author(s):

CHU Yunpeng^1,2, XIAO Yaxin²,LUO Ping², ZHONG Yan², CHEN Xueqin²

(1. Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China; 2. College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China)

关键词:

分层装配式钢框架;  全螺栓连接节点;  损伤模型;  易损性分析

Keywords:

layered assembled steel frame;  fully-bolted joint;  damage model;  fragility analysis

分类号:

TU311

DOI:

10.19815/j.jace.2022.04061

文献标志码:

A

摘要:

为提高装配式钢框架的装配效率,结合节点抗震性能要求,提出一种新型全螺栓分层装配式节点。对新型和传统两类节点进行抗震性能试验研究,并把节点参数引入整体框架模型中,采用SAP2000建立两类框架模型并进行增量动力分析。考虑基于层间位移角的单参数损伤模型和基于变形与累积耗能的双参数损伤模型,定义结构性能水准限值并划分破坏等级,对结构进行地震易损性分析。结果表明:在单、双参数损伤指标下,新型节点框架的易损性曲线都包络于传统节点钢框架的易损性曲线内,且新型节点框架的抗倒塌储备系数更大,说明采用新型节点能降低结构在各破坏状态下的失效概率,提高框架的抗倒塌能力; 在LS1、LS2极限状态下结构基于单参数损伤指标的峰值加速度中位值比基于双参数损伤指标下的峰值加速度中位值小,在LS3、LS4极限状态下则相反,说明累积耗能对结构抗震性能评估影响明显,结合双参数损伤指标能更好地预测结构的损伤程度; 新型节点框架在单、双参数损伤模型下的倒塌储备系数均高于传统框架,说明新型框架的抗倒塌储备能力更高,有利于结构抗震。

Abstract:

In order to increase the assembly efficiency of assembled steel frames, a new fully-bolted layered assembled joint was suggested in accordance with the seismic type performance criteria of the joint. The seismic performance test on the new and traditional joints were carried out, and the joint characteristics were introduced into the whole frame mode. The two types of frame models were built by SAP2000 and the incremental dynamic analysis of the structure was performed. Furthermore, the single-parameter damage model based on interlayer displacement angle and the double-parameter damage model based on deformation and cumulative energy dissipation were considered, respectively, and the structural performance level and failure grade were defined, then the seismic fragility of the structure was analyzed. The results show that under both single and double damage indices, the fragility curves of the new joint steel frame are enveloped within the fragility curves of the traditional joint steel frame, and the collapse resistance reserve coefficient of the frame with the new joints is greater, indicating that the use of the new joint can reduce the probability of failure of the structure under each damage condition and improve the collapse resistance of the steel frame. In the LS1 and LS2 limit states, the median peak ground velocity values of the structure based on the single-parameter damage index are smaller than those based on the two-parameter damage index, while the contrary results can be observed in the LS3 and LS4 limit states, implying that cumulative energy dissipation has a significant effect on the assessment of the structural seismic performance, and the combination of the double-parameter damage index can predict the damage level of the structure accurately. In single-parameter and double-parameter damage models, the collapse resistance reserve coefficients of the frame with the new joint are higher than that of the traditional frame, indicating that the new frame has higher collapse reserve capacity and is beneficial to the seismic resistance of the structure.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-04-18
基金项目:国家自然科学基金项目(51808466); 四川省自然科学基金项目(2023NSFSC0381); 四川省住房城乡建设领域科技创新研究项目(SCJSKJ2021-15)
作者简介:褚云朋(1979-),男,工学博士,教授,E-mail:chuyunpeng@swust.edu.cn。

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更新日期/Last Update: 2024-01-25