预应力混凝土管桩与承台结合部抗剪承载力的试验研究

在地震作用下,预应力混凝土管桩桩顶受到水平剪力作用,而空心管桩的抗剪承载力通常比较弱。常在管桩上部埋入钢筋,浇筑一段混凝土与承台相连,以改善其抗剪性能。在试验的基础上对预应力管桩的抗剪承载力进行了研究,并对填芯混凝土在抗剪承载力中的作用进行了探讨。研究表明,填芯混凝土提高了管桩抗剪承载力,改善了管桩脆性性能。为管桩抗剪承载力计算提供了试验基础及理论依据。

Experimental study on shear capacity of connections between prestressed concrete pipe pile and pile cap

Under horizontal earthquake action,the top of prestressed concrete pipe pile bears shear load,while the shear capacity of the hollow section pipe pile is usually not enough.It can embed reinforced bar and pour concrete in pile's upper portion to make it combined with the platform,so the core concrete can improve shear performance of the pile.Experimental research has been done on shear capacity of prestressed concrete pipe pile and contribution of core concrete to shear capacity.The research showes that the core concrete increases shear capacity and improve ductility of pipe pile.The experimental results and theoretical formula are proposed for designing and calculation of prestressed concrete pipe pile.