半开敞地下室抗震计算分析

Aseismic calculation and analysis of semi open basement

以单面开敞或两面开敞且其余外墙不设置独立挡土墙的单建式地下室为研究对象,以现有地下建筑抗震规范为理论基础,根据半开敞地下室的受力特点,将局部水土压力作为附加荷载施加于外墙,土体的约束作用简化为楼层处各节点具有特定轴向刚度的受压杆,从而简化了地下室结构计算模型,使之等同于地上结构的计算模型,采用通用的地震反应谱法进行受力分析,根据土体约施加前后结构的基底剪力、配筋和位移角的变化情况,得出半开敞地下室的受力特点与计算要点。

In this paper,the research object is the basement which is open on one side or two sides and can not be set up with retaining wall,based on the existing seismic codes for underground buildings,According to the stress characteristics of the semi-open basement,the constraint effect of local soil and water pressure on the external wall is simplified into compression bars with specific axial stiffness at each node of the floor,to be simplifyed the calculation model of underground structure,so that to be approximately equivalent to the computational model of the above-ground structure,a general seismic response spectrum method is used for force analysis,According to the change of base shear,reinforcement and displacement angle of the structure before and after the soil is applied,to obtain the stress characteristics and calculation points of the semi-open basement.