首层采用型钢混凝土柱的柱顶隔震结构设计分析
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（福建省建筑科学研究院福建省绿色建筑技术重点实验室，福州 350025）
［摘要］首柱顶隔震可较好地解决地震中首层结构薄弱易损的问题。由于型钢混凝土比普通钢筋混凝土的承载力和刚度较高、抗震性能较好，将其应用于首层结构可满足隔震层以下结构较高的承载力要求。为较全面地阐述此类结构的工程应用，对某首层架空的9层办公楼进行设计与分析，包括减震方案和底层结构形式的分析与选择、结构的整体有限元分析和隔震设计等。分析表明：相对抗震结构，隔震结构的基本周期显著延长；在设防地震作用下，结构水平向减震系数为0.39，减震效果较好；在罕遇地震作用下，结构仍处于弹性且隔震层安全可靠。对隔震层下部结构进行分析设计，发现采用型钢混凝土相对采用钢筋混凝土的截面尺寸小，在造价增加不多的情况下，既能满足结构安全又可增加首层的使用建筑面积，可获得较好的综合效益。［关键词］型钢混凝土; 薄弱层; 首层柱顶隔震; 橡胶隔震支座中图分类号：TU352.1 文献标识码：A 文章编号：1002-848X(2016)03-0019-05
Design and analysis on isolation structure at column top with SRC columns at first floorXu Chao(Fujian Provincial Key Laboratory of Green Building Technology, Fujian Academy of Building Research, Fuzhou 350025, China)Abstract:The weakness and vulnerability of first floor could be solved with isolation on the top of columns at first floor under earthquakes. Due to the relatively high carrying capacity, high stiffness and good seismic performance compared with common reinforced concrete, the steel reinforced concrete(SRC) is applied to the first floor structure and can meet the high bearing capacity requirements of substructure for isolation layer. In order to make a more comprehensive description of its engineering application, design and analysis on a 9-floor office building with large space at first floor were carried out, including the selection and analysis of damping program and structural form of first floor, overall finite element analysis and the isolation structure design, etc. Results show that: compared with the seismic structure, the fundamental period of the isolated structure is significantly extended; under the fortification earthquake, the damping coefficient of superstructure in horizontal direction is 0.39 and damping effect is well; under rare earthquake, the structure is still in the state of elasticity and the isolation layer is secure. It is found that member section of steel reinforced concrete is relatively smaller than the section of reinforced concrete when the substructure of isolation layer is analyzed and designed. In the case of relative small increase of cost, structure with isolation layer can meet the structural safety requirement and increase usable building area of the first floor. A better overall efficiency will be get using SRC.Keywords:steel reinforced concrete; weak layer; isolation at column top of first floor; rubber isolation bearing
作者简介：徐超，硕士，高级工程师，Email：258570950@qq.com。
