高层混合结构筒体厚度优化设计  

Optimal design of core thickness of hybrid structures in high-rise buildings

作　　者：张淑云[1] 白国良[2] 赵来顺[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安科技大学学报》2010年第2期175-181,共7页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(50578129);教育部博士专项基金项目(20060703001)

摘　　要：为获得高层混合结构中外框架与混凝土筒体之间合理的刚度分配,利用结构优化的方法对筒体厚度进行主动选择,以筒体体积为目标函数,引入结构变形、剪重比、刚重比、框架楼层剪力、柱轴压比、底层墙肢轴压比、构件承载力、构造要求等约束限制条件。通过建立混合结构整体空间有限元模型。采用振型分解反应谱CQC法进行地震响应分析,提出了整体反映混合结构动力性能的优化数学模型。利用ANSYS作为优化工具,使用APDL语言编写优化文件。结合具体的高层混合结构实例,通过不同初始值求解来检验优化模型的可行性及优化算法的收敛性。优化后结构的内力减小,框架承担的内力比例增加,结构性能得以改善。For rational stiffness ratio of exterior frame to concrete core of hybrid structures in high-rise buildings, the core thicknesses are chosen by means of structure optimization design , the objective func- tion about core volume is adopted, some specification requirements about deformation, the ratio of lateral stiffness to gravity, storey shear to gravity, storey shear of exterior frame, axial compression ratio of column and wall limb, bearing capacity of structural member and core construction are regarded as re- stricting conditions, on the basis of 3-D finite element model and reasonable mode numbers, the seismic response are obtained by response spectrum CQC method, and the optimal mathematical model is established for reflecting integrity dynamic properties of hybrid structure. The ANSYS is used for optimizing tool with analysis file of APDL language, an example of hybrid structures optimization is provided through different initial values for verifying convergence of optimization method. The internal forces are reduced in the optimal program, ratios of internal force in exterior frame are increased, and the performance of hybrid structure is improved.

关 键 词：高层混合结构 筒体厚度 优化设计 振型分解反应谱法 

分 类 号：TU973[建筑科学—结构工程]