薄壁钢管混凝土外框加固典型石+砖砌体结构抗震性能分析  

Seismic Performance of Typical Stone and Brick Masonry Structure Reinforced by Concrete Filled Thin-walled Steel Tube Outer Frame

作　　者：金捷 JIN Jie(Fujian Provincial Construction Engineering Technology Center,Fuzhou,Fujian 350100,China)

机构地区：[1]福建省建筑工程技术中心,福建福州350100

出　　处：《水利与建筑工程学报》2024年第6期37-44,共8页Journal of Water Resources and Architectural Engineering

基　　金：福建省科技开发研究项目(2023-B-07;2023-K-47;2022-K-118)。

摘　　要：为了探究薄壁钢管混凝土外框约束加固石+砖砌体结构的抗震性能,采用有限元软件建立未加固与薄壁钢管混凝土外框约束加固的两种典型的三层石+砖砌体结构模型,模拟结构地震破坏全过程并分析其地震响应与抗震性能。研究结果表明:在地震作用下,结构底层石墙率先发生面外破坏,上部砖混结构失去支撑而整体塌落,将底层石结构完全压垮,三层整体结构发生“自下而上再到下”的倒塌破坏过程。在70 gal、110 gal以及150 gal加速度峰值作用的工况下,未加固结构的破坏状态分别为严重破坏(位移角1/250)、倒塌破坏(位移角1/99)以及完全坍塌;结果加固后结构破坏状态分别变为介于轻微破坏与中等破坏(位移角1/700)之间、中等破坏(位移角1/350)以及严重破坏(位移角1/283);相较于未加固结构,层间位移角减小了33.33%~78.72%,裂缝的开展得到抑制,延缓结构坍塌破坏,提高了结构的抗震性能。This work proposed a method which use thin-walled concrete-filled steel tube(CFST)outer frame to strengthen the stone and brick masonry structure.In order to analyze the reinforcement effect,finite element software was used to establish two typical three-story stone and brick masonry models of unreinforced and thin-walled concrete-filled steel tube(CFST)frames constrained reinforcement.The whole process of seismic failure of the structure was simulated and the seismic response and seismic performance were analyzed.The results are as follows.Under the action of earthquake,the bottom stone wall of the structure is the first to fail out of plane,the upper brick and concrete structure loses support and collapses,and the bottom stone structure is completely crushed,and the three-story whole structure collapses and fails from bottom to bottom.Under the conditions of 70 gal,110 gal and 150 gal peak acceleration,the failure states of unreinforced structures are severe failure(displacement Angle 1/250),collapse failure(displacement Angle 1/99)and complete collapse,respectively.Results After reinforcement,the structural failure states were moderate failure(displacement Angle 1/700),moderate failure(displacement Angle 1/350)and severe failure(displacement Angle 1/283).Compared with the unreinforced structure,the displacement Angle between layers is reduced by 33.33%~78.72%,the development of cracks is inhibited,the collapse of the structure is delayed,and the seismic performance of the structure is improved.

关 键 词：石结构 砖砌体结构 薄壁钢管混凝土 抗震加固 

分 类 号：TU365[建筑科学—结构工程]