Wang Ziqi, Zhao Cunbao, Zhang Wenyue
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China.
Hebei Engineering Innovation Center for Traffic Emergency and Guarantee, Shijiazhuang Tiedao University, Shijiazhuang, 050043, China.
Sci Rep. 2023 Dec 15;13(1):22508. doi: 10.1038/s41598-023-49936-y.
In recent years, the emergence of the squeezed branch pile has presented a new avenue for civil engineering, offering a distinctive structure and favorable mechanical characteristics. Squeezed branch piles have strong compressive, uplift, and horizontal load resistance capabilities. Due to the existence of discs, the geometric parameters of squeezed branch piles are abundant but important. This article selects number of discs, disc diameter, disc squeeze angle, and disc spacing as the main influencing factors on the bearing capacity of squeezed branch piles and conducts a qualitative analysis of their mechanical properties. The aim of this article is to analyze the different bearing performances of squeezed branch piles through orthogonal experimental design, simulate test conditions using finite element software ABAQUS, obtain relevant data, and finally determine the weight ranking and optimal combination of influencing factors through range analysis to provide better guidance for engineering practices. Through multi-objective optimization design, six optimization objectives including compressive performance, compressive economic efficiency, uplift performance, uplift economic efficiency, maximum horizontal displacement and maximum bending moment of pile body were analyzed. The analysis methods used included comprehensive balance method, queue scoring method, principal component analysis method, entropy weight method, and analytic hierarchy process. The conclusions obtained are similar, and based on the judgment, the squeezed branch pile with 4 discs, disc diameter of 2.5D, disc squeeze angle of 35°, and disc spacing of 3D is considered as the optimal combination under consideration of all optimization objectives.
近年来，支盘桩的出现为土木工程开辟了一条新途径，其具有独特的结构和良好的力学特性。支盘桩具有较强的抗压、抗拔和抗水平荷载能力。由于存在盘体，支盘桩的几何参数丰富且重要。本文选取盘数、盘径、盘腔挤压角和盘间距作为影响支盘桩承载力的主要因素，并对其力学性能进行定性分析。本文旨在通过正交试验设计分析支盘桩不同的承载性能，利用有限元软件ABAQUS模拟试验工况，获取相关数据，最后通过极差分析确定影响因素的权重排序和最优组合，为工程实践提供更好的指导。通过多目标优化设计，分析了抗压性能、抗压经济效益、抗拔性能、抗拔经济效益、桩身最大水平位移和最大弯矩6个优化目标。采用的分析方法包括综合平衡法、排队打分法、主成分分析法、熵权法和层次分析法。得到的结论相似，经判断，在综合考虑所有优化目标的情况下，盘数为4个、盘径为2.5D、盘腔挤压角为35°、盘间距为3D的支盘桩为最优组合。
