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为研究锁口钢管桩围堰受力性能,以某连续梁桥主墩基础施工所采用的锁口钢管桩围堰结构为工程背景,采用ANSYS建立其三维有限元模型,分析最不利工况条件下各构件应力,并着重分析封底混凝土厚度对锁口钢管桩受力的影响。结果表明,各构件最大应力均小于容许应力,且有一定安全富余量;钢管桩最大应力点位于钢管桩与封底混凝土顶面相交线的角部;钢管桩最大应力值随封底混凝土厚度的增大呈先线性减小、后基本保持不变的趋势。在实际设计中,建议从满足抗浮稳定性与优化钢管桩受力两方面来优化设计封底混凝土厚度。
In order to study the bearing capacity of the cofferdam with steel pipe pile, the structure of the steel pipe pile cofferdam used in the construction of the main pier of a continuous beam bridge is taken as the engineering background. The three-dimensional finite element model is established by ANSYS to analyze the most unfavorable Stress conditions of each component, and focus on the analysis of the thickness of the back cover of the steel pipe locking pile stress. The results show that the maximum stress of each component is less than the allowable stress, and there is a certain margin of safety. The maximum stress point of steel pipe pile lies at the corner of the intersection of the steel pipe pile and the top concrete; the maximum stress value of steel pipe pile varies with the concrete thickness The increase of the first linear decrease, after the basic remained the same trend. In practical design, it is suggested to optimize the thickness of backseason concrete from two aspects: meeting the requirements of anti-floating stability and optimizing the stress of steel pipe piles.