摘要
对于刚性联接裙板式基础系统在竖向荷载V、水平荷载H与弯矩M复合加载条件下的稳定性进行系统的平面应变有限元分析,主要探讨基础间距与宽度之比、地基土不排水抗剪强度的非均质性对于基础系统在不同荷载平面与V-H-M三维荷载空间内的破坏包络面的影响,并与单个基础的相应包络面形状进行对比。对比结果表明,裙板式基础系统的归一化V-H包络面形状与单个基础基本一致,但V-M、H-M包络面形状则出现显著差异。根据有限元得到的裙板式基础系统在单向加载情况下的失稳破坏模式,分别给出竖向、水平及弯矩承载力系数的塑性极限分析上限解。基于计算结果,建议了刚性联接裙板式基础系统的三维破坏包络面方程,该方程可以用来估计给定间距范围内的基础系统在复合加载条件下的承载力。
The stability of rigidly connected skirted foundation systems under the combined loading of vertical （V）, horizontal （H） and moment （M） is investigated using plane strain finite element analyses. The study focuses on the effect of spacing-to-breadth ratio and soil strength nonhomogeneity on the failure envelopes in various loading plane and V-H-M three-dimensional loading space of foundation systems. The analysis results show that the shape of V-H failure envelope of two-footing foundation systems is similar to that of single footing, however V-M and H-M envelopes are considerably different. According to the failure mechanisms of foundation systems under uniaxial loading, the upper bound solution of limit analysis is suggested for the vertical, horizontal and moment bearing capacity factor respectively. Based on the computation results, an analytical equation of three-dimensional failure envelopes for rigidly connected skirted foundation systems is proposed, which can be utilized to estimate the combined capacity of skirted foundation systems within a range of spacing-to-width ratios.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第7期116-123,共8页
China Civil Engineering Journal
基金
国家自然科学基金(50909048)
山东省自然科学基金(ZR2010EQ036)
山东省高等学校科技计划项目(J12LG01)
关键词
裙板式基础系统
破坏包络面
基础间距
复合加载
非均质
skirted foundation system
failure envelope
footing spacing
combined loading
nonhomogeneity
