钢筋砼框架梁端的抗震强度和变形研究

Research on Earthquake Resistant Strength and Deformation of the Beam End of Reinforced Concrete Frames

本文通过低周反复荷载下的钢筋砼框架梁端的试验研究,阐明了上部配筋率、剪跨比、剪压比、下部对上部配筋比、配箍率及其间距的不同变化,对框架梁端的破坏形态及变形与耗能性能的影响。同时,通过理论分析建立了与破坏形态及变形相对应的计算模式,较全面地论述了框架粱端发生弯曲、剪压、斜压破坏和变形的机理。并提出了相应的计算公式,而且与试验结果进行了对比。最后提供了延性钢筋砼框架梁端合理的抗震设计方法建议。

Through experimental investigation of beam ends of reinforced concrete framed structures under reversed cyclic loading, this paper shows the effects of the variation of top steel ratio, shear span ratio, shear compression ratio, bottom to top steel ratio, web reinforcement ratio and stirrup spacing on the failure mode, deformation and energy dissipating capacity of the beam ends. By theoretical analysis, the calculation modes of the corresponding failure modes and deformations are established. The mechanisms for the occurrence of bending, shear compression, diagonal compression failures and deformations are discussed and the corresponding calculation formulas are presented. Test results are compared with those given by the calculation formulas. Finally, a rational aseismic design method for ductile reinforced concrete framed structures is suggested.