不锈钢螺旋杆在古建筑夹心墙中的加固性能研究  

Reinforcement Performance of Stainless Steel Helical Connectors in Ancient Buildings with Multi-leaf Walls

作　　者：汤永净 陈鹏圳[3] GENTILINI Cristina FRANZONI Elisa TANG Yongjing;CHEN Pengzhen;GENTILINI Cristina;FRANZONI Elisa(Jiaxing Key Laboratory of High-performance and Functional Materials in Civil and Environmental Engineering,Tongji Zhejiang College,Jiaxing,Zhejiang 314051,China;Department of Civil Engineering,Tongji Zhejiang College,Jiaxing,Zhejiang 314051,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;University of Bologna,DICAM,Bologna 40121,Italy)

机构地区：[1]同济大学浙江学院嘉兴市土木与环境高性能功能材料重点实验室,浙江嘉兴314051 [2]同济大学浙江学院土木工程系,浙江嘉兴314051 [3]同济大学土木工程学院,上海200092 [4]博洛尼亚大学,意大利博洛尼亚40121

出　　处：《施工技术（中英文）》2022年第21期97-104,共8页Construction Technology

基　　金：国家自然科学基金(52078373)。

摘　　要：夹心墙作为古老的砌体结构广泛存在于历史建筑中,其填充层力学性能较差,且墙体层间黏结力不足,在地震作用下易发生外叶墙平面外破坏,因此有必要对夹心墙结构进行加固,以保护古建筑文化遗产。研究不锈钢螺旋杆对夹心墙的加固性能,对不同砌块进行力学性能测定,并开展拔出试验,得到不锈钢螺旋杆在砌块中的黏结-滑移性能,通过线性回归分析得到影响最大拔出力的关键因素为砌块抗压强度及抗拉强度。选取意大利拉文纳市政塔作为算例,考虑5种不同螺旋杆加固间距,通过推覆分析得到拉文纳市政塔底部剪力-顶部位移关系。研究结果表明,使用螺旋杆加固能够显著提高塔体抗震能力,随着螺旋杆加固间距的减小,塔体在推覆荷载作用下的破坏模式逐渐由外叶墙倾覆过渡到侧墙剪切破坏。The multi-leaf wall is widely used in ancient masonry structures.The physical and mechanical properties of the internal fillings and the bonding between leaves are weak.Therefore,out-of-plane damage is prone to occur under earthquakes,so it is necessary to reinforce the multi-leaf masonry structure for protecting the cultural heritage of ancient buildings.In this paper,the reinforcement of multi-leaf wall by using stainless steel helical connectors is studied,where material characterization and pull-out tests were carried out.The bond-slip curves of stainless steel helical connectors in masonry blocks were obtained.By linear regression analysis it was found that compressive strength and tensile strength of masonry blocks are the key factors that largely influence maximum pull-out load.Finally,the Civic Tower of Ravenna,Italy was selected for case study.Pushover analysis was carried out,considering 5 reinforcement distances of helical connectors,and the base shear-roof displacement pushover curves were plotted.The research results show that the helical connectors can significantly improve the seismic resistance.With the decrease of helical connectors reinforcement distances,the failure mode gradually transforms from local overturning of external leaf to shear failure of the side walls.

关 键 词：古建筑 加固 夹心墙 不锈钢螺旋杆 拔出试验 推覆分析 

分 类 号：TU227[建筑科学—建筑设计及理论]