上海城市规划展示馆改扩建项目减震结构设计

Energy dissipation structural design for reconstruction and expansion project of Shanghai Urban Planning Exhibition Hall

消能减震技术的应用是结构改扩建抗震设计的一种新手段。以上海城市规划展示馆改扩建项目为例,介绍了带黏滞阻尼器改扩建高层建筑混合结构设计的关键问题,包括地震动参数新旧对比、原结构的诊断和判定、改建后结构的验算和改造基本参数的确定,以及减震方案的选择、阻尼器选型、参数、布置方式及构造、附加阻尼比的初步确定、整体结构性能指标以及阻尼器耗能效果。对减震结构和非减震结构方案的整体指标、抗震性能和经济性指标的对比,说明减震结构方案的优越性。对结构进行了小震、中震、大震作用下的结构非线性时程分析、楼板应力和节点专项分析,以及采用规范算法和能量法确定附加有效阻尼比,验证减震结构达到了预定目标,并总结了改扩建类高层混合结构采用减震加固的有效性和必要性。

Energy dissipation technology is a new method of seismic design for structural reconstruction and expansion. The reconstruction and expansion project of Shanghai Urban Planning Exhibition Hall was taken as an example. The key issues in the design of the hybrid structure on the high-rise building with viscous dampers were introduced, including comparison between new and old ground motion parameters, diagnosis and determination of original structure, checking calculation of reconstructed structure, determination of basic parameters of reconstruction, and the selection of damping scheme, type selection, parameters, layout and structure of damper, preliminary determination of additional damping ratio, overall structural performance index and energy dissipation effect of damper. The comparison of the overall index, seismic performance and economic index between the damping structure and the aseismic structure scheme show the superiority of the damping structure scheme. The non-linear time history analysis, floor stress and joint special analysis of the structure under frequent earthquakes, fortification earthquakes and rare earthquakes were carried out, and the effective additional damping ratio were caculated through standard algorithm and energy method, the damping structure were verified that has reached the predetermined goal. And the effectiveness and necessity of seismic reinforcement for reconstruction and expansion of high-rise hybrid structures were summarized.