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钢板桩围堰在桥梁深水基础施工中应用广泛。针对目前已有平面有限元法、空间有限元法和等值梁法等钢围堰分析方法,为研究钢板桩围堰结构的受力情况,本文以某大桥钢围堰施工为工程背景,将等值梁法和有限元法相结合,利用等值梁法基本原理,先将钢板桩简化为等值梁结构,利用平面有限元法对单位长度钢板桩等值梁结构建立有限元模型,计算出板桩每道内支撑的支撑反力,然后对多道水平内支撑分别建立有限元模型,将先前的支撑反力以单元力的形式作用在水平内撑模型上,计算出钢板桩与内支撑连接处的最大位移,内支撑的应力、轴力等。最后,将内支撑最大位移以强制位移的形式作用于钢板桩支撑处,对钢板桩强度和刚度进行验算,计算钢板桩所受应力情况,并与钢板桩围堰空间有限元模型计算结果和现场实测值进行比较,对比结果表明该方法对钢板桩围堰进行受力分析效果明显,钢板桩围堰具有足够的承载能力和安全性。
Steel sheet pile cofferdam is widely used in deep foundation construction of bridges. In view of the finite element method of finite element method, finite element method of finite element method and equivalent beam method, such as steel cofferdam analysis method, in order to study the stress of sheet pile cofferdam structure, this paper takes a steel bridge cofferdam construction as engineering background, Equivalent beam method and finite element method are combined. Based on the principle of isometric beam method, the steel sheet pile is simplified as the equivalent beam structure. The finite element method is used to establish the finite element model of the equivalent beam structure of steel sheet pile per unit length, Then, the finite element model was established for each horizontal internal support, and the previous support reaction force was applied to the horizontal internal support model in the form of unit force, and the connection between the steel sheet pile and the internal support was calculated Department of the maximum displacement, the internal support of the stress, axial force and so on. Finally, the maximum displacement of the inner support was forcedly displaced on the support of the steel sheet pile, the strength and rigidity of the steel sheet pile were checked, the stress condition of the steel sheet pile was calculated, and the calculation results of the finite element model of the steel sheet pile cofferdam and on-site The results show that the method has obvious effect on the stress analysis of steel sheet pile cofferdam, and the steel sheet cofferdam has enough bearing capacity and safety.