一种装配式电力偏心基础的抗拔性能

Pull-out performance of an assembled power eccentric foundation

装配式电力偏心基础是一种新型基础,这种新型装配式基础目前采用已有的标准进行设计计算,但水平力和土对基础设计的影响没有考虑.为研究这种新型装配式电力偏心基础的抗拔性能,首先采用理论计算、有限元模拟,在斜向荷载逐级加载下对其极限抗拔承载力、基础内部传力规律和单个构件受力情况进行分析,为验证结果的正确性,设计一个室内缩尺模型上拔试验.通过结果对比发现:基础整体未发生上拔破坏;基础随着埋深逐渐变深向下传递的力逐渐均匀;单个构件简化计算结果与试验和模拟结果吻合较好.通过基础内部传力规律和单个构件受力分析表明:目前规程中的基础整体上拔设计方法仍然适用于此新型基础;水平力和土对基础传力有一定影响,但对抗拔性能可以忽略不计;单个构件的简化计算方法可行.

Assembled power eccentric foundation is a new type of foundation,which is designed and calculated according to existing standards,but the influence of horizontal force and soil on foundation design has not been discussed.To study the pull-out performance of this new assembled eccentric foundation,the ultimate pull-out capacity,the law of internal force transfer,and the stress of a single component of the foundation are analyzed under progressive loading of oblique loads by theoretical calculation and finite element simulation.To verify the correctness of the results,an indoor pull-up test of a scale model is designed.Based on the comparison of the results,it is found that the whole foundation do not undergo uplift failure.The downward transmitted force gradually become uniform with the increase of the depth of the foundation.The simplified calculation results of a single component are in good agreement with the experimental and the simulation results.The analysis of the internal force transfer law of foundation and the stress of individual member show that the overall uplift design method in the current code is still applicable to this new type of foundation.Horizontal force and soil have certain influence on the uplift of foundation,but the uplift resistance can be neglected.Thus,the simplified calculation method of single member is feasible.