摘要
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 mechanical behaviors of steel pipe sheet piles cofferdam, the steel pipe sheet piles cofferdam adopted for the construction of the main pier foundation of a continuous beam bridge is taken as engineering background, 3 dimensional FE models is built by using ANSYS, the maximum stress responses of all components under the worst conditions are obtained, and the influence of bottom concrete thickness on mechanical behavior of steel pipe sheet piles is emphatically analyzed. Numerical results show that： maximum stress of all components are smaller than the allowable stress, and there is considerable safety margin. It is also illustrated that the maximum stress of steel pipe sheet piles is located near the corner of intersection line between piles and sealing concrete top surface, and the m of piles linearly decreases first and then remains basically unchanged as the bottom se thickness increased. Therefore, it is suggested that bottom concrete thickness should be meeting the requirements of two factors, which is anti-floating stability of the bottom aximum stress aling concrete determined by concrete and optimum mechanical behavior of the steel pipe sheet piles.
出处
《公路》
北大核心
2017年第6期69-73,共5页
Highway
基金
国家自然科学基金项目
项目编号51568019
江西省自然科学基金项目
项目编号20151BAB216025
20161BAB206158
关键词
钢管桩
围堰
三维有限元
封底混凝土
优化设计
steel pipe sheet piles cofferdam
bottom concrete
mechanical behaviors
three- dimensional finite element
optimization design
