高温后型钢混凝土粘结滑移性能研究  

STUDY ON BOND-SLIP BEHAVIOR BETWEEN SPAPED STEEL AND CONCRETE IN SRC STRUCTURES AFTER EXPOSED TO HIGH TEMPERATURE

作　　者：李俊华[1] 邱栋梁[1] 俞凯[1] 孙彬[2] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211 [2]中国建筑科学研究院,北京100013

出　　处：《工程力学》2015年第2期190-200,206,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(50908118);浙江省自然科学基金项目(LY14E080003);宁波市自然科学基金项目(2013A610197);宁波市重点学科项目(XKL11D2079)

摘　　要：高温后型钢与混凝土之间的粘结滑移对型钢混凝土结构的高温后力学性能具有重要影响,为了研究高温后型钢混凝土的粘结强度与滑移特性,进行18个高温后型钢混凝土短柱推出试验及3个常温下的对比试验。试验结果表明:高温后型钢混凝土短柱试件的荷载-滑移曲线与常温下大体相似,但随着曾经经历最高温度的提高及最高温度持续时间的增大,型钢与混凝土之间的极限粘结强度和残余粘结强度降低,与极限粘结强度相对应的滑移减小,与残余粘结强度相对应的滑移增大。在试验结果基础上,构建了高温后型钢混凝土粘结滑移本构模型,提出了本构模型中极限粘结强度、残余粘结强度及相应滑移的计算方法,计算结果与试验结果总体相符,研究成果为高温后型钢混凝土构件考虑粘结滑移影响的数值模拟分析提供了条件。The bond-slip behavior between shaped steel and concrete after exposed to high temperature has a remarkable influence on the mechanical performance of steel reinforced concrete(SRC) structures experienced high temperature. In order to study the bond strength and slip behavior of SRC members after exposed to high temperature, the statically push-out tests for eighteen SRC short columns after exposed to high temperatures and three other comparative short columns at normal room temperatures were carried out. Test results show that the typical load-slip curves of SRC short columns after exposed to high temperatures are almost the same as that at normal room temperatures. But ultimate bond strength and residua bond strength between shaped steel and concrete both descend with the elevation of the highest temperature and the increase of duration of the highest temperature ever experienced. The slip corresponding to ultimate bond strength decreases in some extent with the elevation of the highest temperature and the increase of duration of the highest temperature ever experienced, while the slip corresponding to residual bond strength increases on the contrary. Based on the test results, a bond-slip constitutive model for SRC members after exposed to high temperature is proposed, and the calculating methods to ultimate bond strength, residual bond strength and their corresponding slip in this model are also put forwarded. The proposed bond-slip constitutive relation can be employed for the finite element analysis of SRC members after exposed to high temperature.

关 键 词：高温后 型钢混凝土 粘结强度 滑移 粘结滑移本构关系 

分 类 号：TU398.9[建筑科学—结构工程]