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钢-混凝土组合转换桁架在超高层结构改造中的应用与分析
黄彬辉1,2,李元齐1,罗尽华2
摘 要

(1 同济大学土木工程学院, 上海 200092; 2 上海浦东建筑设计研究院有限公司, 上海 201204)

[摘要]介绍上海某一带6层裙房的超高层改造加固工程,裙房1~3层拆除多个混凝土框架柱后,形成了大跨度转换结构,采用了双榀钢-混凝土组合转换桁架进行加固。采用YJK和ETABS软件进行整体结构计算,分析了整体结构加固后的周期、位移比、刚度比、基底剪力等主要结构设计影响因素;采用ABAQUS软件对桁架的关键节点进行计算,分析了桁架在多遇地震和设防地震作用下的应力和应变。结果表明,双榀钢-混凝土组合转换桁架具有良好的适应性;在整体结构计算中,满足设防地震不屈服要求;关键节点在多遇地震和设防地震作用下基本处于弹性状态,满足抗震性能设计对关键构件的要求。

[关键词]超高层结构;加固改造;双榀钢-混凝土组合转换桁架;抗震性能

中图分类号:TU398-7文献标识码:A文章编号:1002-848X(2021)04-0001-09

 

Application and analysis of steel-concrete composite conversion truss in renovation project of super high-rise structure

HUANG Binhui1,2, LI Yuanqi1, LUO Jinhua2

(1 College of Civil Engineering, Tongji University, Shanghai 200092, China;2 Shanghai Pudong Architectural Design & Research Institute Co., Ltd., Shanghai 201204, China)

Abstract:A super high-rise strengthening and renovation project with a 6-story podium in Shanghai was introduced, multiple concrete frame columns were removed from the first to third floors of the podium to form a large-span conversion structure which was strengthened by double steel-concrete composite conversion trusses. YJK and ETABS software were used to calculate the overall structure, and the main structural design factors  such as the natural period, displacement ratio, stiffness ratio and base shear force of the strengthened structure were analyzed; the ABAQUS software was used to calculate the key nodes of the truss and analyze the stress and strain of the truss under frequent earthquakes and fortification earthquakes. The results show that the double steel-concrete composite conversion trusses have good adaptability; in overall structure calculation, it meets the requirements of non-yielding under fortification earthquakes; the key nodes are basically in an elastic state under the action of frequent earthquakes and fortification earthquakes, meeting the performance-based seismic design requirements for key components.

Keywords:super high-rise building;strengthening and renovation;double steel-concrete composite conversion truss;seismic performance

 

作者简介:黄彬辉,博士研究生,高级工程师,一级注册结构工程师,Email:keyhbh@163.com。