摘要
针对拉锚式双排桩围护结构的特点,提出了分离协调计算法的设计流程,利用该方法确定排距、后排桩间距等参数。采用分离协调式法、平面杆系整体计算法与有限元法分别计算结构受力与位移,探讨了拉锚式双排桩的变形和受力特性。将三种方法的设计计算结果以及位移监测数据进行了对比,结果表明平面杆系整体计算得到的位移与有限元法计算和监测数据较为接近,其桩身内力也与有限元法较为吻合,而分离协调式法结果较为保守,与实际存在较大差别。其原因在于连梁的拉锚作用使得其按规范规定的极限位移在实际中不会达到。实际应用时要结合两种方法的特点,采用分离协调式法确定参数,平面杆系整体计算法进行校核与优化,以实现设计的可靠性和经济性要求。
According to the characteristics of anchorage double-row piles retaining structure, a method for separation and coordination calculation is used to determinate the spacing between the front pile row and the second row and the spacing between the piles of the second row. The separation and coordination calculation method, the plane element structure calculation method, and the finite element method （FEM） were used to calculate the deformation and stress of the structure. The characteristics of deformation and stress of the double-row pile retaining structure were discussed. Comparing to the monitoring data, the deformation results of the plane element structure calculation method coincide well with the results of FEM and the monitoring data. The internal forces were also much closer to the FEM results. The separation and coordination calculation method is conservative and shows large differences from the real engineering condition. This is caused by the ultimate displacement according to the standard used in the calculation will not be reached due to the anchorage beams. The separation and coordination method can be used to determine the design parameters, then the plane element structure calculation method could be used to assess the reliability and economic of the structure.
作者
蒋超
JIANG Chao(China Railway Siyuan Survey and Design Group Co Ltd, Wuhan 430063, Chin)
出处
《土木工程与管理学报》
北大核心
2017年第3期50-56,共7页
Journal of Civil Engineering and Management
关键词
拉锚式双排桩
分离协调式法
平面杆系弹性支点法
有限元
anchorage double-row piles
separation and coordination method
plane element structure calculation method
finite element method
