长期荷载作用下SCS墙受力性能研究

摘要

根据混凝土的多轴徐变理论,基于弹塑性力学基本原理,采用比例加载方式研究了长期荷载作用对钢板混凝土(SCS)墙平面内极限承载力、钢板屈服时承载力(屈服承载力)和应力-应变关系的影响.在此基础上,分析了加载比例、截面配钢率等因素对长期荷载作用下SCS组合墙力学性能的影响规律.对比结果表明,长期荷载作用对SCS墙的极限承载力影响程度较小,对屈服承载力影响较大;在双轴受压和双轴拉压的受力状态下SCS构件屈服承载力显著降低,单元割线刚度减小;双轴受拉情况下SCS构件承载力几乎不变,割线刚度提高.%Based on the creep theory of concrete under multi-axial stresses and the basic theory of elastic-plastic mechanics,the effects of long-term loads on the in-plane ultimate bearing capacity,the yield bearing capacity and the stress-strain relationship were investigated by means of proportional loading mode.On the basis of the theoretical analysis,the influences of the loading ratio and the reinforcement ratio were discussed.The calculated results indicate that the long-term loads have a slight influence on the ultimate bearing capacity of SCS wall elements,but have a significant influence on the yield capacity.The yield capacity and the secant stiffness of SCS elements have a decrease under the biaxial compression and the biaxial tension-compression.The capacity has little change under biaxial tension state,but the elements secant stiffness has an improvement.