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介绍了2个相同尺寸混凝土扩展基础分别在上拔、上拔与水平力组合荷载作用下的室内足尺试验概况,并根据加载过程中的基顶荷载位移、基础主柱纵筋应变、扩大端钢筋和混凝土应变等试验数据,分析了2种荷载工况下混凝土扩展基础的承载变形特性及混凝土裂缝发展规律。结果表明:①上拔和水平力组合荷载作用下,基础上拔荷载位移曲线呈现出两阶段特性,而水平位移曲线随水平力增加近似呈线性增加,水平荷载降低了扩展基础的抗拔承载性能;②上拔和水平力组合荷载作用下,基础主柱横截面部分受拉、部分承压,在基础立柱与底板连接处的拉应力最大,混凝土裂缝未贯穿全截面,而在上拔荷载作用下,混凝土扩展基础主柱全断面受拉,裂缝贯穿全断面。
This paper introduces the overview of the indoor full-scale test of two concrete expansion foundations with the same size respectively under combined loads of uplifting, uplifting and horizontal force. According to the load-displacement of the foundation during loading, the longitudinal reinforcement of the main columns, Steel and concrete strain and other experimental data to analyze the load-bearing deformation characteristics of concrete expansion foundation under two kinds of loading conditions and the development rules of concrete cracks. The results show that: (1) Under the combination of uplift and horizontal force, the displacement curve of the foundation shows a two-stage characteristic, while the horizontal displacement curve increases linearly with the increase of horizontal force, and the horizontal load reduces the uplift load-bearing capacity ; ② Under the combined action of uplift and horizontal force, the cross section of the main column is partially tensioned and partly under pressure. The tensile stress at the connection between the foundation column and the bottom plate is the largest. The concrete cracks do not penetrate the full cross section, Under the concrete expansion of the main columns of the whole section of the tension, fracture throughout the whole section.