抗拔工程桩的裂缝控制及配筋设计

Crack Control and Steel Reinforcement Design of Uplift Pile

对于埋深较大的建(构)筑物,抗拔桩桩身配筋通常由裂缝控制。因规范中并未明确给出抗拔静载试验最大加载值,在工程实践中,各设计人员的取值也不尽相同。若试验加载值取得较大则造成工程桩的配筋率过大,若试验加载值较小又不能保证桩抗拔承载力的安全储备。结合以往的工程实践,给出了几种安全可靠、经济合理的抗拔桩配筋设计及验收检测的方法,同时也对现行规范关于工程桩试验荷载及地下水浮力下的裂缝计算给出了建议。

For the deep-buried building,the steel reinforcement of the uplift pile is usually controlled by cracks.Because the maximum loading value of uplift static load test is not given clearly in the code,the value used by each designer is not the same in the engineering practice.If the static load test value used is large,the steel reinforcement of the pile will be too large,and if the static load test value used is small,the safety reserve of the pile uplift bearing capacity can not be guaranteed.Combined with past engineering practice,this paper presents several safe,reliable,economical and reasonable methods for steel reinforcement design and acceptance testing of uplift piles,and gives some suggestions for crack calculation of engineering piles under test load and ground water buoyancy in the current code.