摘要
工程实际中钢筋常在受压区被截断,而这种布筋方式是否对粘结有利是存在争议的。为评价横向荷载作用下应力场对粘结性能的影响,分别在混凝土和钢筋中设置应力函数,结合物理方程和几何方程,通过数学运算求出了钢筋和混凝土界面的位移场。将界面相容条件作为补充方程引入即可求出所有待定常数,同时可求出界面的应力场和应力集中系数。通过数值模拟证明解析公式具有一定的精度,因此可以作为评价横向荷载作用下拔出试件中钢筋与混凝土界面应力场的一种有效方法。最后,在该文解析解的基础上分析了横向荷载对粘结的影响并且给出了横向压力的上限值。
It has been generally accepted in practice to terminate bars in compression zone,but whether or not such a treatment benefits the bond capacity is questionable.This paper evaluates the impacts of stress fields under transverse pressure on the bond capacity.To do that,Airy stress function was set for concrete and steel bars respectively.And then,combing the physical and geometrical equations,the paper deduced the displacement fields near the interface.Supplementing the interface compatibility conditions,coefficients can be determined,hence stress fields and stress concentration factors of interface were obtained.Through numerical examinations,the analytical solution was found to be reasonably accurate,thus it can be used to determine the characteristics of the stress field near the interface of concrete and steel bars when pull-out specimens is subjected to transverse pressure.Finally,based on the proposed solution of this paper,the impacts of transverse pressure on the bond capacity were analyzed,and the maximum limit of transverse pressure was proposed.
出处
《工程力学》
EI
CSCD
北大核心
2012年第4期168-177,184,共11页
Engineering Mechanics
关键词
混凝土
粘结
界面
应力场
应力集中系数
concrete
bond
interface
stress field
stress concentration factor
