连梁抗震加固中梁跨内有无螺栓连接的影响

EFFECTS ON SEISMIC STRENGTHENING OF COUPLING BEAMS WITH OR WITHOUT BOLT CONNECTIONS IN BEAM SPAN

钢筋混凝土连梁是抗侧向力剪力墙或核心筒结构中的一个重要构件。在地震作用下,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,由于安全性或新的用途要求,需对老旧建筑中的连梁进行加固处理。通过对在连梁抗震加固中梁跨内采用有、无螺栓连接连梁的试验,对加固后连梁的抗震结构性能的影响进行研究。研究表明:梁跨内无螺栓连接加固的连梁在循环荷载下,具有更好的耗能性能、强度增加更大、较小的刚度退化、延性性能增强且延性系数不降低。实际连梁加固中推荐在梁跨内无螺栓连接,且用其他方法克服钢板屈曲问题。

Reinforced concrete coupling beam is an important member of a major lateral load-resisting structure-coupled shear wall or core wall. Under seismic actions, local/hilum of coupling beams may lead to a more serious global failure of the whole lateral load resisting system of the building. Along with the development of economy and society, it is necessary and important to strengthen coupling beams that are substandard under seismic actions due to the lack of safety margin and new service in old RC buildings. This paper presents an experimental study into the effects on seismic strengthening of coupling beams with or without bolt connections in beam span. The study shows that the strengthened coupling beam without bolt connections in beam span subjected to cyclic loads has better energy dissipation, larger strength, less stiffness degradation.