纤维增强混凝土梁柱节点受剪承载力计算  

CALCULATION OF THE SHEAR CAPACITY OF FIBER-REINFORCED CONCRETE BEAM-COLUMN JOINT

作　　者：王英俊[1] 梁兴文[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》2015年第12期161-167,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51278402;51078305)

摘　　要：将纤维增强混凝土(FRC)梁柱节点在地震作用下的抗剪机制简化为约束斜压杆机制和桁架机制的综合作用,约束斜压杆机制由节点核心区FRC和箍筋共同作用形成的约束FRC抵抗,桁架机制由节点核心区梁、柱纵筋与周围FRC之间的粘结力承担。考虑这两种机制在受剪承载力机制中的比例,推导出FRC梁柱节点受剪承载力计算公式。将所收集到的28个FRC梁柱节点试件受剪承载力试验值与计算值进行比较,二者之比的平均值为1.04,变异系数为0.08,验证了受剪承载力计算模型的合理性。The shear-resistance mechanism of fiber-reinforced concrete（FRC） beam-column joints subjected to earthquake is simplified as a combination of the confined compression strut mechanism and the truss mechanism. The confined compression strut mechanism is undertaken by the confined FRC, which is composed of stirrups and FRC in the core of the joint. The truss mechanism is undertaken by the bond resistance between longitudinal reinforcements in the beam and column and the surrounding FRC in the core of the joint. Thus the calculation formula of the shear capacity of FRC beam-column joint considering the proportion of those two shear-resistance mechanism in the total shear-resistance mechanism was derived. The average ratio of experimental values of FRC beam-column joints（28 in total） to calculated values by the method is 1.04 with a coefficient of variation of 0.08. Thus the feasibility of the method is verified.

关 键 词：梁柱节点 约束斜压杆机制 桁架机制 粘结力 受剪承载力 

分 类 号：TU375.4[建筑科学—结构工程]