基坑支护非对称荷载下支撑结构的刚度计算

The Stiffness Calculation of Bracing Structure Under the Asymmetric Load in Deep Excavation

规范推荐的基坑支撑体系的水平刚度系数计算前提之一是基坑两侧荷载对称,基坑内支撑结构在两侧非对称荷载下,其水平刚度系数和结构内力、变形均与对称荷载条件下不同。支撑结构在两侧不对称荷载下将产生附加变形,从而引起内力重分布,最终达到受力平衡。本文分析基坑的支撑体系在非对称荷载条件下的变形特征,采用迭代计算得到内支撑结构的刚度,并进而求解出基坑支护的内力及变形,并对计算结果进行了讨论,其计算结果与按对称荷载的计算相比更显合理。

Synunelrieal load was one of the premises in the stiffness ealculalion of bracing strueture in deep excavation in the technical specification, h was difference for the bracing structure with Ihe internzd three and the deiormation under the asymmetric load for tire stiffness coefficient of fulcurm bearing was changed. The bracing structure will deform under tire asymmetrie load,caused the inlernal force varied and lead to force balanced. The characteristic of deformation in tire bracing structure was analysis; iterated algorithm was adupted to solve the stiffness,the internal force and the deformation. The result was discussed and it was more reasonable,compare with the result under the symmetric load.