钢筋混凝土连梁抗震加固的试验研究  

Experimental study of strengthened RC coupling beams for earthquake resistance

作　　者：朱勇[1] 周云[2] 苏启亮[3] 

机构地区：[1]广州大学土木工程学院,广东广州510405 [2]广州大学科技处,广东广州510405 [3]香港大学土木工程系

出　　处：《四川建筑科学研究》2009年第3期59-64,共6页Sichuan Building Science

基　　金：香港研究资助委员会资助项目(HKU7168/06E和HKU7129/03E);科技部重大基础研究前期研究专项项目(2004CCA03300);广州市科技攻关重大项目(2004Z1-E0051)

摘　　要：钢筋混凝土连梁是抗侧向力(风荷载和地震作用)结构—剪力墙或核心筒中的一个重要构件。在地震作用下,连梁的刚度、强度及延性对整个结构的行为表现有极大的影响。局部连梁的失效可引起抗侧力结构的整体失效。随着经济、社会的发展,在过去建成的没有考虑抗震设计或采用过时规范设计连梁的老旧高层建筑,不再满足安全要求以及由于时间因素,钢筋强度的退化,混凝土强度的降低;还有建筑物改变用途,需要增加结构构件强度,所有这些因素,都会要求对连梁进行加固处理。本文介绍了钢筋混凝土连梁加固的抗震试验研究。加固采用在连梁两侧用螺栓固定钢板的方法。研究结果表明,加固后的连梁在循环荷载下,具有更好的耗能性能、强度增加、延性性能增强且延性系数不降低。所以,此种连梁加固方法是一种可行的、能应用于实际建筑结构的、有待更进一步研究、完善的连梁加固方法。Reinforced concrete coupling beam is an important＂ member of a major lateral load-resisting structure-coupled shear wall or core wall. Under seismic actions, the shear resistant and deformation capacities of coupling beams might become critical. Local failure of coupling beams may lead to a more serious global failure of the whole lateral load resisting system of the building. Along the development of economy and society, many local old RC buildings, which designed without any provision for earthquake resistance or according to outdated design standards, are not considered now to have enough safety margin; due to time effect, their concrete and reinforcement have already suffered serious deterioration; Furthermore, some existing buildings are updated for new service, this require to increase the strength of members. It is therefore necessary and important to strengthen coupling beams that are substandard under seismic actions. This paper presents an experimental study on strengthening reinforced concrete coupling beams using bolted external steel plates on the side faces of the beams. The effects of improvements on strength, deformation and energy dissipation of the external plate strengthened reinforced concrete coupling beams are reported.

关 键 词：连梁 抗震加固 钢板 螺栓连接 

分 类 号：TU973[建筑科学—结构工程]