超长桩的屈曲荷载计算  

Buckling Loads for Super-long Piles

作　　者：姚文娟[1] 傅祥卿[2] 仇元忠[1] 

机构地区：[1]上海大学土木系,上海200072 [2]上海建科建设监理咨询有限公司,上海200072

出　　处：《地下空间与工程学报》2009年第3期463-467,562,共6页Chinese Journal of Underground Space and Engineering

摘　　要：影响超长桩稳定的重要因素是桩侧土抗力。根据超长桩的工作特性,提出了一种新的桩侧土水平抗力计算模型。基于能量法给出了顶部有集中荷载,部分埋置于Winkler地基中超长桩的挠曲函数,并推导出超长桩的临界荷载公式。对分别采用m法,常数法和作者提出的计算模型计算的临界荷载作了比较,计算结果表明作者提出的模型计算得到的临界荷载值比较合理,m法计算的临界荷载偏大,而常数法得到的临界荷载偏于保守。分析了桩侧摩阻力对超长桩稳定性的影响,以及不同比例系数对超长桩临界荷载的影响。The soil resistance of pile side is an important factor which affects the stability of super-long piles. Based on the working condition of super-long pile, a modified model was proposed for calculating the lateral resistance. The corresponding flexure function is given for the partially embedded super - long piles in Winkler with top concentrated load and we can get the function of the critical load of the pile by using energy method. Critical load cal- culated by M model, Constant methods and method proposed in this paper are compared, and the results show that critical load calculated from the model proposed is more reasonable while that from M model is comparatively larger and the Constant model is conservative. In addition, the effects of pile lateral friction on the stability of super-long pile are analyzed, and the effects of different coefficient of super-long pile on critical load are analyzed too.

关 键 词：超长桩 瑞里-里兹法 临界荷载 土抗力模式 

分 类 号：TU473.1[建筑科学—结构工程]