形状记忆合金丝加固古塔墙体抗震性能试验研究  

Experimental studies on seismic performance of ancient pagoda wall strengthened with shape memory alloy wire

作　　者：谢启芳 浩文明 徐敦峰 王越众 XIE Qifang;HAO Wenming;XU Dunfeng;WANG Yuezhong(School of Civil Engineering, Key Lab of Structural Engineerning and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, P. R. China;Zhengzhou University Comprehensive Design Institute Co., Ltd., Zhengzhou 450000, P. R. China)

机构地区：[1]西安建筑科技大学土木工程学院,结构工程与抗震教育部重点实验室,西安710055 [2]郑州大学综合设计研究院有限公司,郑州450000

出　　处：《土木与环境工程学报（中英文）》2022年第2期38-47,共10页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51878550);陕西省杰出青年科学基金(2021JC-44)。

摘　　要：针对砖石古塔墙体抗震性能差的问题,提出采用形状记忆合金丝(SMA丝)对古塔墙体进行抗震加固的新技术。为研究其加固效果,对SMA丝进行了力学性能测试,分析应变幅值对其耗能的影响,并通过SMA丝加卸载训练使其保持稳定的完全超弹性状态;通过2片SMA丝加固古塔墙体模型(1片完好墙体和1片损伤墙体)和1片未加固古塔墙体模型的拟静力试验,研究SMA丝加固对古塔墙体破坏形态、滞回性能、承载力、变形能力、刚度退化规律、延性及耗能能力等抗震性能的影响。试验结果表明:采用SMA丝加固古塔墙体虽未改变墙体的破坏模式,但在一定程度上可改善其脆性破坏,显著提高墙体的承载力和耗能能力,有效限制墙体的剪切变形,延缓墙体的开裂和刚度退化;与未加固墙体相比,SMA丝加固墙体的承载力和极限位移分别提高了16.91%和22.65%,SMA丝加固损伤墙体的承载力和变形能力甚至超过了完好墙体,但其弹性段和开裂段刚度和承载力明显低于完好墙体。In view of the poor seismic performance of the ancient pagoda wall,a new seismic strengthening technology,strengthening the ancient pagoda wall with shape memory alloy wire(SMA wire),was proposed.In order to study the reinforcement effect,the mechanical properties of SMA wire were tested,and the influence of strain amplitude on its energy consumption was analyzed.The SMA wires were trained by loading and unloading to maintain a stable fully superelastic state.Then,the pseudo-static tests of two ancient pagoda wall models(one intact wall and one damaged wall)strengthened with SMA wire and one unreinforced model were carried out.The effects of SMA wire reinforcement on the seismic performance such as failure mode,hysteretic performance,bearing capacity,deformability,stiffness degradation law,ductility and energy dissipation capacity of historical masonry tower wall were studied.Test results show that SMA wire reinforcement does not change the failure mode of the wall,but can improve the brittle failure to a certain extent,can significantly improve the bearing capacity and energy consumption capacity of the wall,effectively limit the shear deformation of the wall and delay the wall cracking and stiffness degradation.Compared with the unreinforced wall,the bearing capacity and ultimate displacement of the wall strengthened with SMA wire increase by 16.91%and 22.65%,respectively.The bearing capacity and deformation capacity of the damaged wall strengthened with SMA wire are even greater than that of the intact wall.However,the stiffness and bearing capacity of elastic section and cracked section are obviously lower than that of intact wall.

关 键 词：古塔墙体 形状记忆合金丝 超弹性 抗震加固 抗震性能 

分 类 号：TU362[建筑科学—结构工程]