成都市规划展览馆辅楼多重复杂钢结构设计

Multi-complex steel structural design on podium building of Chengdu Urban Planning Exhibition Hall

成都市规划展览馆辅楼建筑面积约34 000m2,平面呈L形,外包尺寸112m×97m。因建筑需要,底层大面积架空,存在20.8m的大悬挑,以及内部31.2m和36.4m的两个大跨度,同时还有错层、竖向构件转折、楼板不连续等多重复杂情况;另外,极短的施工工期要求也给结构选型及设计造成困难。针对该结构的特点,选用抗震性能优良的钢框架-支撑结构体系;并根据抗震性能化设计目标要求,对结构进行了整体静力、动力弹塑性、复杂节点有限元、楼盖舒适度、防连续倒塌等分析,并据此采取相应措施。结果表明,该结构选型布置合理、抗震性能优良、防连续倒塌能力较强、整体结构安全。

Podium building of Chengdu Urban Planning Exhibition Hall has a total floor area around 34000m2 with an L shaped plan, and its outline size is 112m × 97m. Due to the requirements of architecture, the building needs a vast transparent ground floor, so a 20. 8 meters cantilever and two large-span units with 31.2 meters and 36. 4 meters are respectively required. Other challenges like split-level, discontinuous vertical members, floor discontinuity and etc. are also met in this building. In addition, a very short construction time limit for a project also causes difficulties to the structural selection and design. Based on the above situation, steel frame-brace system with excellent seismic performance was adopted. And according to the requirements of performance-based seismic design, the overall structure static, dynamic elastic-plastic analysis, finite element analysis of the complex joints, the floor comfort and progressive collapse analysis were all executed and corresponding measures were taken. The results show that the structural layout is reasonable, the seismic performance is superior, the continuous collapse prevention ability is strong and the whole structure is safe.