新配筋方案小跨高比连梁的试验研究

洞口连梁是抗震剪力墙结构多道抗震防线的第一道,其抗震性能优劣决定整个结构的抗震性能。但高延性、高耗能、小跨高比连梁的设计仍是国内外抗震钢筋混凝土结构中至今未能有效解决的问题之一。提出了一种沿梁截面高度将箍筋分三层布置的新配筋方案,做了3个试件的试探性试验,研究了名义剪压比、剪箍比、配箍特征值等因素对新配筋小跨高比连梁的延性、耗能性能、破坏形态的影响。试验证明新配筋方案连梁的抗震性能优良、施工方便,是解决这一问题的一个有效途径。

Experiment Research on Seismic Performance of New Reinforcement Scheme Deep Coupling Beam

Coupling beams between openings of coupled shear walls are the first defense against earthquake loading,whose earthquake-resistant performance is the key to the whole structure.In view of the seismic coupling beam with small span-to-depth ratio with good ductility and energy dissipation hasn't been discovered so far.A new reinforcement scheme coupling beam in which the stirrup is divided into three rings along the depth of coupling beam is put out.Tentative test for three short coupling beams specimens has been carried out.Some factors such as the ratio of nominal shear stress to concrete compressive strength,the ratio of shear to shear resistance and stirrup index have been studied,which has effect on ductility,energy dissipation and failure mode.It has been proved that the earthquake-resistant performance of the new reinforcement scheme coupling beam is superior to the current reinforcement scheme coupling beam and construction of the former is easy.The new reinforcement scheme coupling beam is an available way to solve the problem.