主桩套板结构受力特性研究

主桩套板结构作为一种板桩墙结构形式,各构件受力情况较复杂。结合工程算例应用NL法进行水平承载力计算,并利用ABAQUS有限元分析软件建立3D桩土模型进行数值模拟,以验证理论方法的可靠性,发现主桩承担了绝大部分荷载,套板所受横向弯矩较竖向要大得多。基于ABAQUS研究不同套板尺寸下主桩的力学特性,着重分析当套板宽度、厚度和入土深度发生变化时主桩的弯矩变化,结果表明主桩的受力情况深受套板宽度的影响,其跨中最大弯矩随套板宽度的增加而明显增加,而套板厚度和入土深度对主桩的影响相对较小,在实际工程中可以根据需要做适当调整。

Mechanical behaviors of main pile with inserted sheet structure

As a structure type of sheet-pile wall,the main pile with inserted sheet structure is composed of some certain members,the force condition of which is relatively complicated.Based on an engineering example,the NL method is utilized to compute lateral bearing capacity.In order to verify the reliability of theoretical method,a 3D pile-soil model is established by ABAQUS finite element analysis software to carry out numerical simulation.It is revealed that most of the load is carried by main pile,for inserted sheet,horizontal bending moment is much larger than the vertical one.Moreover,mechanical properties of the main pile with different inserted sheet size are studied based on ABAQUS,and the moment variation of the main pile is emphatically analyzed with the change of the inserted sheet width,thickness as well as embedded depth.The results indicate that force conditions of the main pile are greatly affected by the inserted sheet width,and the maximum mid-span bending moment of the main pile increases significantly along with the width.While inserted sheet thickness and embedded depth have less influence on the main pile.According to the actual need in engineering,appropriate adjustments can be made for the thickness or embedded depth.