冻融损伤钢筋混凝土柱恢复力模型研究  

Research on Restoring Force Model of Freeze-Thaw Damaged Reinforced Concrete Columns

作　　者：王燕[1] 徐善华[1] 李安邦[1] WANG Yan;XU Shanhua;LI Anbang(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工业建筑》2022年第8期97-102,共6页Industrial Construction

基　　金：国家自然科学基金项目(51078307);陕西省教育厅重点实验室项目(17JS061)。

摘　　要：为研究寒冷及地震设防地区既有钢筋混凝土结构的抗震性能,对经历冻融循环作用的8根钢筋混凝土柱进行低周反复荷载试验研究。综合考虑冻融循环次数与轴压比对试件柱承载力和滞回性能的影响规律,通过理论分析与试验回归相结合的方法,提出了冻融损伤钢筋混凝土柱的三折线刚度退化骨架曲线,给出了试件柱屈服前后卸载刚度的计算式及具体的滞回规则,进而建立了冻融损伤钢筋混凝土柱“指向定点”的刚度退化三线型恢复力模型。通过试验曲线与计算曲线的对比分析表明:建议的恢复力模型预测结果较好,可为冻融环境下钢筋混凝土柱的地震反应分析提供理论依据。In order to study the seismic performance of existing reinforced concrete structures in cold and seismic regions, the results of the quasi-static tests of eight reinforced concrete columns subjected to freezing-thawing cycles were analyzed. Considering the impacts of freezing-thawing cycle times and axial compression ratio on the bearing capacity and hysteretic behavior of member columns, a trilinear skeleton curve was proposed. Besides, the calculation formula of unloading stiffness before and after yield and specific hysteretic rules were obtained, furthermore, the stiffness degradation trilinear restoring force model of “pointing point” of freezing-thawing damaged reinforced concrete columns was established. The comparative analysis between the test curves and the calculation curves showed that the proposed restoring force model had a certain accuracy, which could provide a theoretical basis for the seismic response analysis of reinforced concrete columns in freeze-thaw environment.

关 键 词：钢筋混凝土柱 冻融循环 低周反复荷载试验 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程]