反复荷载作用下PBPS竖缝抗震性能试验及理论研究

本文对装配式大板结构(PBPS)竖缝在反复荷载作用下的抗震性能进行研究,以便使装配式结构最终成为一种完善的抗震体系。共设计、试验了18榀试件,描述了试件在反复荷载作用下的受力破坏过程,分析了竖缝的抗震性能及受力机理。认为接缝最大受剪承载力随接合筋直径的增大而增大,与接缝宽度成非线性关系,且通过接缝混凝土的斜压杆机制和接合筋的压力摩擦机制表现出来;反复荷载作用下,接缝强度及刚度退化,脆裂后的接缝受剪承载力通过削弱的斜压杆机制和接合筋的销栓作用表现出来,其大小随接缝宽度的增大而增大,随接合筋直径的增大而增大。提出了竖缝受剪承载力计算公式,并对计算值与试验值进行比较,二者吻合较好。

Experimental and theoretical study on seismic behavior of vertical connection in PBPS under repeated loading

Eighteen specimens were designed and tested to research the seismic behavior and load carrying mechanism of vertical connections in prefabricated big panel structures (PBPS) under repeated cyclic loadings. The test process and crack developing were depicted and the seismic behavior and mechanical mechanisms of connections were analyzed with conclusions drawn. It was found that the shear resistance of vertical connection increases with the increase of the diameter of connecting rods and has nonlinear relation with connection width, and works by mechanism of diagonal compressive column(MDCC) of connection concrete and mechanism of compressive friction of connecting rods. Under repeated loading, the strength and rigidity of connection degrade while the shear resistance increases with connecting rods and with connection width, and works by degraded MDCC and dowel action of connecting rods. Formulas of shear resistance are proposed. Theoretical values are in good agreement with test results.