型钢与混凝土之间粘结强度的力学分析  

THEORETICAL STUDY ON BOND STRENGTH BETWEEN SHAPED STEEL AND CONCRETE IN SRC COMPOSITE STRUCTURES

作　　者：郑山锁[1] 邓国专[1] 田微[1] 吴敏哲[1] 曾磊[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《工程力学》2007年第1期96-100,105,共6页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50378080);国家博士后科学基金资助项目(20015);陕西省教育厅专项科研计划项目(06JK263)

摘　　要：基于大量实腹式型钢混凝土试件粘结滑移性能对比试验研究结果,得到了型钢与混凝土粘结面上粘结应力的分布特征和粘结力组成部分(化学胶结力、摩擦阻力和机械咬合力)之间的转化规律;根据磨损接触面的运动调节机理,分析了型钢与混凝土之间粘结面的微动磨损特征,论证了型钢混凝土粘结滑移试验中荷载-滑移曲线与接触体系三体理论中破损混凝土形成和演化规律之间的吻合特性;根据型钢与混凝土协同受力的主要缺陷是其粘结面易发生剪切粘结破坏的试验结论,对型钢与混凝土之间的粘结滑移破坏进行了剥层理论分析,阐释了型钢与混凝土之间摩擦阻力和机械咬合力的产生和转化规律;对型钢混凝土粘结强度进行了塑性极限理论分析,推导了粘结强度上限解的数学表达式,并对影响型钢与混凝土粘结性能的材料因素进行了探讨。研究成果为型钢混凝土结构的设计计算理论研究奠定了基础,并且为组合结构的数值实验分析提供了理论依据。Based on the experimental study of pull-out, push-out, pull-push cycle, and short-column specimens on bond-slip behaviors between shaped steel and concrete, the distribution of bond stress on the interface of shaped steel and surrounding concrete is obtained. The shifts of 3 parts （chemical adhesive action, friction resistance and mechanical interlock） that compose the bond strength are measured respectively. According to the velocity accommodation mechanism, the fretting wear characteristics of adhesive interface of shaped steel and surrounding concrete are investigated. The harmony between the load-slip curves in bond-slip tests and the producing and evolving process of ruptured concrete are demonstrated. The experimental results show that the weakness of cooperative bearing capacities of steel and concrete just rests with the shear-slip failure on their adhesive interface, so a mechanical model of bond failure on the interface is established in delamination theory. The producing and transforming laws of friction resistance and mechanical interlock are proposed. The bond strength is quantificationaUy analyzed in plastic ultimate theory. The upper limit of bond strength is deduced and some material parameters affecting bond behaviors are discussed theoretically. All these may contribute to the further analysis of bond-slip performance in SRC composite structures.

关 键 词：型钢混凝土结构 粘结强度 滑移 微动磨损 剥层理论 塑性极限分析 试验研究 

分 类 号：TU311[建筑科学—结构工程] TU398.9