摘要
为了研究高延性混凝土(high ductile concrete,HDC)加固震损古旧砌体的抗震性能,对6个HDC加固震损古旧砌体试件进行低周反复荷载试验,研究HDC加固面层总面积、砌筑砂浆强度、试件开洞口数量等因素对各试件的破坏特征、滞回曲线等抗震性能指标的影响程度。试验结果表明,用HDC加固后古旧砌体的峰值荷载较加固前最大提升可达313.4%,延性位移系数较加固前最大提升可达151.3%。在试验基础上,通过确定骨架曲线恢复力模型、卸载刚度退化规律并结合加卸载滞回规则,建立适合HDC加固震损古旧砌体结构的三折线恢复力模型。所得到的计算曲线与试验曲线吻合度较好,该三折线恢复力模型可用于地震作用下HDC加固震损古旧砌体的非线性动力反应分析。
Here,to study aseismic performance of earthquake damaged ancient masonry strengthened with high ductility concrete(HDC),6 specimens of earthquake damaged ancient masonry strengthened with HDC were tested under low cyclic repeated load to study effects of total area of HDC reinforced surface layer,strength of masonry mortar and number of openings on aseismic performance indexes,such as,failure characteristics and hysteretic curve of each specimen.The test results showed that the peak load of ancient masonry strengthened with HDC is 313.4% higher than that before reinforcement,and the ductility displacement coefficient is 151.3% higher than that before reinforcement;on basis of tests,by determining the skeleton curve restoring force model and the degradation law of unloading stiffness,and combining with the loading and unloading hysteretic rules,a trilinear restoring force model suitable for earthquake damaged ancient masonry structures strengthened with HDC is established;the calculated curves with the trilinear model agree better with test ones,so the trilinear restoring force model can be applied in nonlinear dynamic response analysis of earthquake damaged ancient masonry strengthened with HDC under seismic action.
作者
寇佳亮
樊明艳
孙国兴
周恒
KOU Jialiang;FAN Mingyan;SUN Guoxing;ZHOU Heng(School of Civil Engineering&Architecture,Xi’an University of Technology,Xi’an 710048,China;State Key Lab of Eco-Hydraulic Engineering in Northwest Arid Areas,Xi’an University of Technology,Xi’an 710048,China;Northwest Engineering Corporation Limited,Power China,Xi’an 710065,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第7期106-115,125,共11页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(52079109,51408487)
陕西省自然科学基础研究项目(2020JM-454)。
关键词
高延性混凝土(HDC)
震损古旧砌体
抗震加固
滞回曲线
三折线恢复力模型
high ductility concrete(HDC)
earthquake damaged ancient masonry
aseismic reinforcement
hysteretic curve
trilinear restoring force model
