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2010年上海世博会中国国家馆上大下小、四棱台斗冠状外形使其屋盖竖向支撑较少,主梁梁端最大弯矩设计值达到4.86万kN.m,在建筑净高受限的条件下,采用常规主梁难以承担。介绍了屋盖桁架主梁、工字钢组合次梁、屋盖板设计中的难点、重点和相关构造做法,给出了在桁架端部采用钢板围套加强以减小弦杆局部弯矩、上弦杆贯通3片剪力墙利用栓钉的滑移减小弦杆巨大轴力在单片剪力墙墙肢内引起的剪力的措施。并由有限元分析验证了上述技术措施的可行性。最后进行了在n个点上生成n个随机体重、随机频率的人行荷载时程下的屋盖竖向振动全过程分析,多组随机分析即蒙特卡洛法分析结果表明,屋盖的竖向振动舒适度满足要求。
The 2010 China World Expo 2010 Shanghai China Pavilion under the small, four-sided Taiwan bucket crown shape to make the roof vertical support less, the maximum beam beam end of the maximum bending moment design value reached 48,600 kN.m, Under the conditions, the conventional main beam is difficult to bear. The key points and the related construction methods are introduced in the design of roof truss girder, secondary beam of I-beam and roof slab, and the reinforcement of steel truss at the ends of truss is given to reduce the local bending moment of chord, Winding Rod Through 3 Shear Walls The use of studs to reduce the chipping of large chordal forces caused by the chord in the monolithic shear wall. The feasibility of the above technical measures is verified by the finite element analysis. Finally, the whole process of roof vertical vibration under n time-consuming load history with n random weights and random frequencies generated at n points was analyzed. The results of multi-group random analysis (Monte Carlo analysis) showed that the vertical Vibration comfort to meet the requirements.