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为了研究负摩阻力作用下断桩对框架结构的影响,本文运用ABAQUS有限元分析软件,建立了地基、桩基础和上部4等跨4层的钢框架结构模型,并通过在地基土表面施加堆载使桩侧由于地基沉降产生负摩阻力,分析该过程中存在和不存在断桩情况下上部结构的响应,并研究了断桩位置、断桩长度和上部结构刚度对上部结构的梁上弯矩、柱轴力和柱脚沉降的影响。结果表明外侧柱下存在断桩时对上部结构的影响比内侧柱下存在断桩的影响要大;且柱下断桩长度越短,上部结构刚度越大,断桩对结构内力的影响越明显。
In order to study the influence of the broken pile on the frame structure under the effect of negative skin friction, this paper established the foundation frame, the pile foundation and the upper 4-span and 4-story steel frame structure model by ABAQUS finite element analysis software. The results show that the pile structure has a negative frictional resistance due to subsidence of foundation and the response of the superstructure under the presence and absence of broken pile in the process is analyzed. The bending moment on the superstructure of the superstructure is studied, including broken pile position, broken pile length and superstructure stiffness , The axial force and the settlement of the column foot. The results show that the influence on the superstructure when the pile is broken under the outer column is greater than that under the inner column. The shorter the length of the broken column, the higher the stiffness of the superstructure, the more obvious the influence of the broken pile on the structure’s internal force .