【摘要】 本文在基础为刚性、基础周边土用不能受拉的理想弹塑性弹簧代替的假定下,同时考虑基础与地基土之间的脱开和地基土的弹塑性性质,导出了埋入基础的倾覆力矩和转角的关系式。在此基础上,进一步对结构-基础-地基土体系采用两种计算模型,选取120组土性参数值和五种空气冲击波荷载特性参数进行了动力参数分析,以研究空气冲击波作用下高层房屋人防地下室的倾覆问题。文中以一座典型的14层住宅建筑为例,给出了倾覆力矩与转角关系的表达式,并讨论了地基土特性、侧壁土与基底土的相对贡献、爆炸当量以及房屋尺寸等因素的影响。更多还原

【Abstract】 The purpose of the paper is to investigate the overturning-resistance of high-rise buildings with basement shelters under airblast loading. For simulation of the separation of the foundation from the soil and the elasto-plastic behavior of the soil in the paper the foundation is assumed to be absolutely rigid and its surrounding soil is represented by distributed ideal elasto-plastic springs without tensile resistance.Furthermore,two analytical models for the structure-foundation-soil system are adopted and 120 groups of soil characteristics values and 5 groups of air-blast loading characteristics are used in the parametric studies for a 14-story building. The overturning-moment-rotation relation is derived. Effects of factors such as the soil characteristics, foundation stiffness, relative contribution of the soils under the base of the foundation and around the side wall, the explosive yield and the building dimensions on the overturning-resistance are examined.更多还原