通过建立双排钢板桩围堰体系弹塑性模型，采用UGNX7.5中的Nastran有限元分析模块对整体钢板桩的静态刚强度进行计算，得到围堰施工、正常使用、校核水位3种工况共8个组合下钢拉杆的应力、应变分布规律.该分析方法用于杭州三堡排涝工程进水口双排钢板桩围堰设计，双排钢板桩间距取值比较合理，结构较经济，使用中整体稳定性较好，有效发挥了钢板桩和钢拉杆的材料性能.%Elastic-plastic model of double-row steel sheet pile cofferdam system was established and Nastran finite-element analysis module of UGNX7. 5 was adopted to calculate the static rigidity and intensity of the overall steel sheet pile, thus to obtain the stress and strain distribution rule of steel tie rod under 8 combined working conditions including cofferdam con-struction, normal use and check water level. During the construction phase of cofferdams, the stress of steel tie rods in-creased linearly along with increasing loading cubic meter of earth and vehicle load. Under normal use conditions, lateral steel sheet piles undertook passive earth pressure and increasing vehicle load, which further enhanced stress of steel tie rods;the stress of steel tie rods linearly increased when outer river water level rose. The check flood level with simultaneous loading of vehicle load was the most unfavorable condition for steel tie rods;the displacement value of steel tie rods with ve-hicle load was 15. 3 times of that without vehicle load, as the middle part was yielded. Meanwhile, the influence of steel sheet pile spacing on steel tie rods was analyzed, as the stress of steel tie rods decreased along with increasing spacing. The optimum steel sheet pile spacing was approximately 1. 0 time of the cofferdam height;however, when transport service was required, the steel sheet pile spacing should be enhanced.
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