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1.建筑物基础埋深和重心在震害调查中,人们能看到地上建筑结构的震害情况,却容易忽视基础埋深、构造形式对建筑物抗震性能的影响。基础埋深设计是根据地勘报告中持力层的标高确定的,在北方还要考虑冰冻线影响。传统的灰土基础历史悠久,北京古城、民居四合院以及20世纪五六十年代所建的多层砖砌房屋大多用灰土基础。灰土在基槽中经过夯实,影响对地基土层的加固,减小建筑物的沉降量,
1. Foundation depth and center of gravity In earthquake damage survey, one can see the seismic damage of the ground structure, but it is easy to ignore the impact of the basic depth and structure on the seismic performance of the building. The design of the basic depth is based on the elevation of the stratum in the geological prospecting report. The influence of the freezing line is also taken into consideration in the north. The traditional lime-soil foundation has a long history. Most of Beijing’s ancient cities, residential quarters, and multi-storeyed brick houses built in the 1950s and 1960s are mostly based on lime-soil. Lime soil in the trough after compaction, affecting the reinforcement of the foundation soil, reducing the amount of settlement of buildings,