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为了提高剪力墙连梁的延性以防止脆性破坏,本文根据结构控制的概念提出了一种自控连梁。通过光弹性试验和24根钢筋混凝土试件在低周反复荷载下的试验,详细研究了自控连梁的强度、荷载-变形关系、滞回反应和延性等性能,给出了强度计算方法。结果表明:自控连梁在使用荷载下刚度大;纵筋屈服后有足够的延性,能承受较大的塑性转角;耗能理想。预计通过该连梁可以控制剪力墙结构的地震反应。因此,在地震区对于连梁跨高比小于0.2的剪力墙可采用自控连梁。
In order to improve the ductility of the shear wall coupling beam to prevent brittleness damage, this paper presents a self-control coupling beam according to the concept of structure control. The photoelasticity test and 24 steel reinforced concrete specimens were tested under low cyclic reversed load. The strength, load-deformation relationship, hysteresis reaction and ductility of the self-controlled coupling beam were studied in detail. The strength calculation method was given. The results show that the self-control coupling beam has large rigidity under the applied load; the longitudinal reinforcement has sufficient ductility after yielding, and can withstand a large plastic rotation angle; the energy dissipation is ideal. It is expected that the seismic response of the shear wall structure can be controlled by the coupling beam. Therefore, self-controlled coupling beams can be used for shear walls with coupling ratio less than 0.2 in the seismic zone.