钢管混凝土柱-钢梁-轻钢主次框架振动台试验研究  

Shaking table test of concrete-filled steel tubular column-steel beam-light weight steel primary-secondary frame structures

作　　者：杨红[1,2] 苏星宇 王志军[1,2] 郑宇睿 白久林 YANG Hong;SU Xingyu;WANG Zhijun;ZHENG Yurui;BAI Jiulin(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of Chinese Education Ministry for City-Building in Mountain Area and New Techniques,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《建筑结构学报》2024年第2期82-94,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52078078);“十三五”国家重点研发计划(2016YFC0701506)。

摘　　要：为了增加轻钢框架结构的应用范围,基于主次结构的理念,提出了以钢管混凝土柱-钢梁-斜撑为主结构并形成主要抗侧力体系,以主要承受自身竖向荷载的轻钢框架为次结构的结构体系,其中轻钢次框架以循环嵌套的方式与主结构相结合。为研究轻钢次框架的结构形式、钢管混凝土柱-钢梁连接节点、次框架采用预制装配式楼板对主次框架结构损伤特征和抗震性能的影响,按7度0.1g设计并制作了2个按1∶3缩尺的6层钢管混凝土柱-钢梁-轻钢主次框架结构模型。对2个模型分别进行振动台试验,分析了其动力特性和地震响应。试验结果表明:2个缩尺模型在7度0.1g罕遇地震作用下均无明显破坏现象,在8度0.2g极罕遇地震下的最大层间位移角分别达到1/28和1/35,但主要结构构件未出现明显损伤;次框架采用铰接梁柱节点并取消第3层钢柱可明显减小水平地震对次框架受力的影响,且可提高装配率、降低造价;刚性法兰连接节点可确保双向水平地震下钢管混凝土柱端先屈服,能满足连接节点更强的抗震要求;经过构造措施加强的次结构预制楼板与边钢梁有明显的组合空间作用,可对边钢梁扭转形成有效约束。In order to improve the application of light steel frame structures,based on the concept of primary-secondary structures,a building structure with concrete-filled steel tubular(CFST)column-steel beam-diagonal braces as the main structure forming the main lateral force resistance system,and light weight steel frame as the secondary structure bearing its own vertical load was proposed,and the secondary frame was combined with the main structure in a circular nesting manner.In order to study the influences of structural form of light weight steel frame,CFST column-steel beam connection joint and prefabricated floor of the secondary frame on the damage characteristics and seismic performance of primary-secondary frame structure,two 6-story scaled models with a scale ratio of 1∶3 were designed according to 7-degree 0.1g earthquake.Shaking table tests were conducted for the two models respectively to analyze their dynamic characteristics and seismic responses.The results show that the two scaled models have no obvious damage under 7-degree 0.1g rare earthquake,and the maximum inter-story drift ratio of the two models under 8-degree 0.2g extremely rare earthquake are 1/28 and 1/35,respectively.However,there is no obvious damage to the main structural members.The use of hinged beam-column joints for the secondary frame and the cancellation of steel columns in the third story can significantly reduce the impact of horizontal earthquakes on the secondary frame,improve the assembly rate and reduce cost.Rigid flange connection joints can ensure the first yield of CFST column ends under two-way horizontal earthquakes,which can meet the seismic requirements of connection joints.The prefabricated floor of the secondary frame strengthened by details and the side steel beams have obvious combined space effect,which can form an effective constraint on the twist of the side steel beams.

关 键 词：钢管混凝土柱 主次结构 轻钢框架结构 振动台试验 抗震性能 

分 类 号：TU352.1[建筑科学—结构工程] TU317.1