基于桩顶位移协调的地下室底板抗浮设计

Anti-floating design of the basement slab structure based on the pile-top displacement consistent

预应力混凝土管桩具有较高的抗压和抗拔承载力,且施工速度快、经济性好,在沿海地区被广泛采用。对于承受较大水头压力的地下室底板结构而言,抗浮方案往往是控制底板结构工程造价的关键因素。通过优化布桩方案,采用剪切位移法计算抗拔桩变形,结合工程实践经验对相关参数进行修正,最终求得抗拔桩的竖向刚度理论值,并按照桩顶与地下室底板结构变形协调的模式,采用有限元法对地下室底板进行内力分析和设计。

Due to the characteristics of high uplift resistance capacity and compressive strength, fast construction speed, well economic efficiency, prestressed concrete pipe piles are widely used in coastal areas. For the basement slab structure under high water pressure, anti-floating scheme are usually the key factor to control its cost. Through the optimization of the pile arrangement scheme, shear-displacement method was used to calculate the uplift pile deformation. Combined with the engineering practice, the relevant parameters were amended. Finally, the theoretical vertical stiffness of uplift piles were obtained and finite element method was used to analyze the internal force and design the basement slab structure according to the pile-top and basement slab structure displacement consistent model.