预应力锚固抗滑桩内力计算的加权残值法

Stress calculation of prestressed anchor anti-slide pile based on weighted residual method

总结了预应力锚索抗滑桩锚索设计拉力和预应力的计算方法并进行了改进,使得各方法均能考虑锚索与桩体的位移协调。针对桩顶和桩身作用锚索的各种情形,将半解析、半数值的加权残值法应用于预应力锚索抗滑桩的内力计算,并采用适用性较广的B样条函数作为试函数,在此基础上编制了可考虑滑动面以上桩前土体抗力计算程序,将该程序应用于已有实例的分析,并与有限差分法进行对比,验证了程序的正确性,将该方法应用于其他两个计算实例的分析,针对锚索设计拉力和预应力的不同计算方法,分别给出了相应的锚索设计拉力、预应力、桩身最大弯矩和桩顶位移的对比分析表格,以及桩身受力图,计算结果还表明,对于特定计算实例不是所有计算方法都适用,要具体问题具体分析。

The design tensile and prestressing force calculation method of anti-slides pile with prestressed cables are summarized and improved, which makes the methods consider displacement coordination of pestressed cable and pile. According to each case of prestressed cable acting on pile top and pile body, the semi-analytic and semi-numerical weighted residual method is applied to stress calculation of anti-slides pile with prestressed cables; and the extensively adapted B-spline function is used as trial function; then the calculation program is worked out; and the program can consider soil resistance above sliding surface in front of pile. The program is applied to analyze existing example; and its result is compared with the result obtained by finite difference method; the reliability of the method is proved. Simultaneously, the proposed method is applied to another two calculation examples; aiming at different calculation methods of anchor design tensible and prestressing force, the comparative analysis table with relevant design tensible force, prestressing force, maximum bending moment of pile body and pile top displacement is presented respectively; pile force diagram is given; and the calculation also shows that it is not every method suitable for specific calculation example; and it must take concrete analysis of concrete issue.