盐渍土环境下纤维锂渣混凝土柱恢复力模型  

Restoring force model of fiber lithium slag concrete column in saline soil environment

作　　者：张广泰[1,2] 周乘孝 刘诗拓 ZHANG Guang-tai;ZHOU Cheng-xiao;LIU Shi-tuo(School of Engineering,Xinjiang University,Urumqi 830017,China;Key Laboratory of Building Structure and Earthquake Resistance,Xinjiang University,Urumqi 830017,China;Chongqing Wanzhou District Municipal Facilities Maintenance Management Center,Chongqing 404100,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830017 [2]新疆大学新疆建筑结构与抗震重点实验室,乌鲁木齐830017 [3]重庆市万州区市政设施维护管理中心,重庆404100

出　　处：《吉林大学学报（工学版）》2024年第7期1944-1957,共14页Journal of Jilin University:Engineering and Technology Edition

基　　金：新疆维吾尔自治区自然科学基金重点项目(XJEDU2021D01D07);国家自然科学基金项目(51968070).

摘　　要：为研究聚丙烯纤维锂渣混凝土(PLiC)柱在盐渍土环境下的抗震性能,对6根试验柱进行低周反复荷载试验。基于试验结果,得到四折线骨架曲线,并在众学者的研究基础上考虑纤维和锂渣的作用,通过回归分析得到各特征点修正系数计算公式。结合侵蚀时间的影响,引入刚度退化指数μ和损伤因子D,采用适用于PLiC柱承载力衰减、刚度退化的滞回规则,建立了盐渍土环境作用下的PLiC柱力-位移恢复力模型。结果表明,加入聚丙烯纤维和锂渣可一定程度上提高混凝土柱的极限承载力、延性等力学性能及耐久性。由本文恢复力模型得到的骨架曲线、滞回曲线与试验结果吻合度良好,可为盐渍土环境下聚丙烯纤维锂渣混凝土柱抗震性能非线性分析提供参考。In order to study the seismic behavior of polypropylene fiber lithium slag concrete(PLiC)columns in saline soil environment,low-period cyclic load tests of six columns were conducted.On account of the test results,the four-polyline skeleton curve was obtained.Based on the research of many scholars,considering the role of additives,obtaining the calculation formula of correction coefficient of each characteristic point by regression analysis.Introducing stiffness degradation indexμand damage factor D to combine the effects of erosion time,using the hysteretic rule applicable to the attenuation of bearing capacity and stiffness degradation of PLiC column to establish the force-displacement restoring force model of PLiC column under saline soil environment.The results showed that polypropylene fiber and lithium slag could improve durability and the mechanical properties such as ultimate bearing capacity,ductility of concrete columns.The skeleton curve and hysteresis curve obtained from the established restoring force model are in good agreement with the test results,which can provide a reference for the nonlinear analysis of seismic performance of polypropylene fiber lithium slag concrete columns in saline soil environment.

关 键 词：结构工程 盐渍土环境 聚丙烯纤维锂渣混凝土 滞回规则 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程]