关于高烈度区掉层结构的隔震设计分析

Analysis of Seismic Isolation Design for Floor-out Structure of High Intensity Area

我国三分之二以上的国土面积为山地地形,尤其对于西部地区,而这些地区处于地震多发的高烈度区。掉层结构是山地建筑具有代表性的结构型式,指的是同一栋建筑的底界面放置在不同标高的场地基面上,且最高接地点以下按层高设置楼面的接地结构。当高烈度区的掉层结构有隔震要求时,工程经验是在掉层部分设置刚度很大的地下室,布置同一标高的隔震层。这样的方案不但会导致材料浪费,还会导致掉层部分空间使用效果不理想等问题。以四川庐山县人民医院门诊楼项目为基础,从掉层结构的特性出发,针对布置在同一标高隔震层带来的问题,探索将隔震层布置在不同标高下掉层结构的隔震设计方案。

More than two thirds of land area is the mountain topography in China, especially in the western region. And these regions are located in in the high intensity area of the earthquake more frequently. The floor-out structure is a the representative structure of the mountain building, which means the bottom interface of the same building is placed on the different elevations of ground base level, and the ground structure of floor is set up according to the floor height below the highest ground point. When the floor-out structure of high-intensity area is required with the seismic isolation, the engineering experience is to set up the higher rigidity of basement in the floor-out section and the same elevation of seismic isolation layer isconstructed. This scheme not only leads to the material waste, but also results in the non-ideal space use effect of floor-out section. Taking Sichuan Lushan County People's Hospital Outpatient Building Project as the basis, from the characteristics of floor-out structure and aiming at the problems brought by the seismic isolation layer constructed at the same elevation, the article discusses the seismic isolation design scheme of constructing the seismic isolation layers at the different elevations of floor-out structure.