随机车辆荷载下桥台桩—土体系沉降有限元分析

发布时间：2018-04-21 17:26

本文选题：动三轴试验 + 桩土耦合作用　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：车辆荷载是一种强度相对较低、作用周期较长,作用时间间隔和荷载峰值均是不均匀的随机荷载。车辆荷载长期作用于路桥过渡段处,桥台产生变形并且桥台桩基因承受上部传来的荷载和桩侧土体的沉降的共同作用而出现较大的沉降,严重时甚至被破坏,使得桥台桩体的承载能力大大下降,从而影响路桥正常的通车运营。针对此问题,作者通过土体动力试验,现场采集随机车辆荷载和有限元模拟分析相结合的方法,以阜新地区为研究对象进行随机车辆荷载下桥台桩—土体系沉降的影响进行研究,主要工作如下：(1)对取自阜新地区城南七号桥桥址处土体进行动三轴试验,得出了土体动力作用的重要参数。(2)以实际桥梁为对象,观测并采集了在交通量高峰时段车辆密集通过桥梁时对桥台产生最大影响情况下的挠度响应曲线,借助Matlab软件将其转化为加速度信号,通过对桥台桩—土体系模型简化受力分析,得出行驶中的车辆对桥台桩—土体系产生的随机荷载。(3)借助有限元软件Midas/GTS对在随机车辆荷载作用下单桩—土体系的沉降进行分析,总结不同因素对桩—土体系的影响。(4)以阜新市城南七号桥为工程背景,对在随机车辆荷载作用下桥台群桩—土体系的沉降进行研究分析,得出不同布桩数量、布桩距离和桩体长径比对桥台群桩—土体系沉降的影响。
[Abstract]:Vehicle load is a kind of random load with relatively low strength, long period of action, and uneven load time interval and load peak. The vehicle load acts on the transition section of Luqiao for a long time, the abutment is deformed and the abutment pile gene bears the joint action of the load from the upper part and the settlement of the soil body in the pile side. The load-bearing capacity of the abutment pile is greatly reduced even when it is seriously damaged, which affects the normal traffic operation of Luqiao. In view of this problem, the author collects random vehicle load and finite element simulation analysis by soil dynamic test, and carries out the abutment pile under random vehicle load in Fuxin area. The main work of the soil system settlement is as follows: (1) the soil dynamic three axis tests taken from the No. seven bridge site in the south of the city of Fuxin are carried out, and the important parameters of the dynamic action of the soil are obtained. (2) taking the actual bridge as the object, the maximum of the bridge to the abutment is observed and collected when the traffic is high in the high peak period. The deflection response curve under the influence is transformed into an acceleration signal with the help of Matlab software. Through the simplified stress analysis of the abutment pile soil system model, the random load produced by the driving vehicle to the abutment pile soil system is obtained. (3) with the help of the finite element software Midas/GTS, the single pile soil system under the load of random vehicles is used. The settlement is analyzed and the influence of different factors on the pile and soil system is summarized. (4) taking the No. Seven Bridge in Fuxin city as the engineering background, the settlement of the pile and soil system of abutment group under the load of random vehicle is studied and analyzed, and the influence of the number of piles, the distance of the pile and the ratio of the length and diameter of the pile to the settlement of the pile and soil system of the abutment is obtained.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.1

【参考文献】