端部约束HFR-LWC梁极限承载力研究  

Ultimate carrying-capacities of HFR-LWC beam w ith special restrains

作　　者：张岩岩 成松松 陈万祥 郭志昆 ZHANG Yanyan;CHENG Songsong;CHEN Wanxiang;GUO Zhikun(State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学爆炸冲击防灾减灾国家重点实验室

出　　处：《混凝土》2019年第8期58-62,67,共6页Concrete

基　　金：国家自然科学基金项目(51378498,51578541)

摘　　要：将钢筋混凝土梁的特定约束简化为水平刚度和转动刚度,根据受力过程中的几何关系、物理关系和平衡关系,并考虑塑性铰长度的影响,建立了基于面力效应的钢筋混凝土梁极限承载力计算方法。对10根(3根简支、7根特定约束)混杂纤维轻骨料混凝土梁进行四点抗弯试验,分析了支座约束刚度、纤维和配筋率对轻骨料混凝土梁相对承载力的影响规律,结果表明面力效应由支承的水平刚度和转动刚度共同提供,极限抗力对支承转动刚度更为敏感,且考虑面力效应的极限承载力为忽略面力效应的1.5~5.5倍。The special constrains of reinforced concrete beam are characterized by horizontal stiffness and rotational stiffness.The ultimate carrying-capacities of reinforced concrete beams with membrane actions are obtained based on the geometric equation,physical equation and equilibrium equation,in which the length of plastic hinge is also concerned.Four-point bending tests of LWC beams are conducted,including three simple support beams and seven fixed support beams.The influences of boundary constraint,reinforcement ratio and hybrid fibers on relative load-bearing capacities of the beam are investigated.It is found that membrane actions are acted by the combined effects of horizontal stiffness and rotational stiffness,but it is more sensitive to rotational stiffness,and the ultimate carrying-capacities of LWC beams are 1.5 to 5.5 times compared with that of membrane actions being neglected.

关 键 词：混杂纤维轻骨料混凝土梁 面力效应 极限承载力 理论分析 试验研究 

分 类 号：TU528.01[建筑科学—建筑技术科学]