抗震设防烈度为6度地区的常规建筑基础最小埋深讨论

Study on Minimum Embedded Foundation Depth of Conventional Buildings in Regions with Seismic Fortification Intensity of Six Degree

通过公式推导和算例对比分析抗震设防烈度为6度地区常规建筑(200m高度内不同高度、各场地类别、各种地基情况、不同平面形状满足规范高宽比的钢筋混凝土房屋、结构形式为框架、框架剪力墙、剪力墙等)在罕遇地震和50年一遇风荷载作用下基础抗滑稳定性和抗倾覆稳定性,以确定基础最小埋深。结果表明,基础无需埋深时,绝大多数建筑抗倾覆稳定性满足,绝大多数建筑抗滑移稳定性满足。建筑高度增加一般并不需要增加基础埋深。提出抗震设防烈度为6度地区常规建筑基础最小埋深的设计建议。

Through formula derivation and sample studies, the foundation anti-sliding stability and anti-overturning stability of the conventional build- ings in regions with seismic fortification intensity of six degree are studied under conditions of rare earthquake and wind load occurring in 1/50 years. The study shows that the anti-sliding stability of most buildings are qualified when the foundation needs no embedded depth, and no further foundation embedded depth is necessary with the increase of building height. Some design advices are also presented for similar projects.