带悬挑钢桁架的某博物馆结构设计探讨

On exploration for structural design of some museum with cantilever steel truss

某博物馆建筑外形独特,为体系复杂的钢管混凝土框架结构。结构存在扭转不规则、楼板不连续、尺寸突变、穿层柱等多项不规则。设计探讨了结构体系布置,通过多遇地震下的弹性分析对比和罕遇地震下的动力弹塑性时程分析考察结构的抗震性能。针对悬挑尺寸大且内跨支座段较短的特点,补充了整体结构非线性稳定性分析、基于弹性静力法的抗倒塌分析,选取悬挑区域作为独立体,研究独立体在无其他构件帮扶下的强度和稳定性,提出针对性的加强措施。分析结果表明,主体结构安全合理,可以达到设定的抗震性能目标。

The paper indicates the buildings of museums with unique outlines are complicated steel pipe concrete framework structure,which are featured with irregular torsion,discontinuous floors,dimension mutation and irregularity of crossing columns,explores the structural system layout,analyzes the seismic performance of the structure through the elastic analysis under earthquakes and dynamic elastic-plastic time and history analysis,illustrates the non-linear stability analysis of the whole structure as for the large sizes of the cantilever and shorter cross-support section,selects the cantilever areas as the individual unit based on the anti-collapsible analysis of the elastic static method,researches the strength and stability of the individual unit with the assistance of other members,points out the improvement measures and proves by the analysis result that the safe and reasonable main structure will achieve the designed seismic performance.