UHPC嵌缝加固福建典型石+砖砌体结构抗震性能分析  

Seismic performance analysis of a typical stone-brick masonry structure reinforced with UHPC embedded in stone wall mortar joint in Fujian

作　　者：商昊江 陈善权 王昊 曹悫 吴应雄[6] Shang Hao-jiang;Chen Shan-quan;Wang Hao;Cao Que;Wu Ying-xiong(Fujian Academy of Building Research Co.Ltd,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Green Building Technology,Fuzhou 350108,China;Quanzhou Urban Construction Group,Quanzhou 362000,China;Fujian Zhongzhi Planning and Design Research Group Co.Ltd,Zhangzhou 363000,China;College of Civil Engineering,Xiamen University Tan Kah Kee College,Zhangzhou 363105,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建省建筑科学研究院有限责任公司,福建福州350108 [2]福建省绿色建筑技术重点实验室,福建福州350108 [3]泉州城建集团有限公司,福建泉州362000 [4]福建中咨规划设计研究集团有限公司,福建漳州363000 [5]厦门大学嘉庚学院土木工程学院,福建漳州363105 [6]福州大学土木工程学院,福建福州350108

出　　处：《工程抗震与加固改造》2024年第6期137-145,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：福建省住房和城乡建设厅科技开发研究项目(2023-B-07,2023-K-47,2022-K-118,2020-K-88)。

摘　　要：福建沿海地区底层石砌、上部砖混这类典型的石+砖结构民宅保有量大,底层石结构整体性弱且抗震性能差,需要进行加固以提高整体结构的抗震性能。超高性能混凝土(UHPC)性能优异,用其嵌缝加固石墙已经表明可有效提高石结构的抗震性能。为探究底层石墙经过UHPC嵌缝加固后石+砖砌体结构的整体抗震性能,采用LS-DYNA有限元软件建立未加固和UHPC嵌缝加固(勾缝深度25mm)的两种三层石+砖砌体模型,模拟结构地震破坏全过程并分析地震响应、破坏机制及抗震性能。结果表明:地震作用下,底层承重石墙首先灰缝开裂并发生面外倒塌,而后上部砖混结构整体塌落,将底层石结构完全压垮,整体结构发生“自下而上再到下”的倒塌破坏过程;未加固结构在PGA为55gal时结构达到轻微破坏状态(位移角1/2333),在110gal时达到倒塌破坏状态(位移角1/116);加固后结构在PGA为55gal和110gal时破坏状态分别为基本完好(位移角1/2693)和中等破坏(位移角1/437);相比未加固结构,位移角减小了67.03%~73.48%,加固效果显著。In coastal areas of Fujian province,the number of typical stone-brick structures such as the bottom stone and the upper brick and concrete is large,and the integrity of the bottom stone structure is weak and the seismic performance is poor,so it is necessary to improve the seismic performance of the whole structure.Ultra-high performance concrete(UHPC)has excellent performance,and when it is embedded in stone wall mortar joint,it can effectively improve the seismic performance of stone structure.In order to investigate the overall seismic performance of the stone-brick masonry structure after the bottom stone wall is reinforced with UHPC embedded in joint,finite element software LS-DYNA is used to establish two kinds of three-layer stone-brick masonry models with or without UHPC embedded in stone wall mortar joint(25mm joint depth).The whole process of seismic failure of the structures are simulated,and the seismic response,failure mechanism and seismic performance analyzed.The results show that under the action of earthquake,cracks occurred firstly at ash seam of the bottom bearing stone wall,and the stone wall collapsed outside plane,and then the upper brick-concrete structure collapsed,crushing the bottom stone structure completely,and the whole structure collapsed from bottom to bottom.For the unreinforced structure,when the PGA is 55gal,the structure reaches the state of slight failure(displacement angle is 1/2333),and when it is 110gal,the structure reaches the state of collapse failure(displacement angle is 1/116).For the reinforced structure,when the PGA is 55gal and 110gal,respectively,the failure states are basically intact(displacement angle is 1/2693)and moderately damaged(displacement angle is 1/437),respectively.Compared with the unreinforced structure,the displacement angle is reduced by 67.03%to 73.48%,and the reinforcement effect is remarkable.

关 键 词：石+砖结构 石结构 UHPC嵌缝加固 石墙体 抗震加固 

分 类 号：TU362[建筑科学—结构工程]