包头奥运冰雪中心结构设计

Structural design of the Olympic Ice and Snow center in Baotou

包头奥运冰雪中心属于超限高层建筑,下部混凝土部分为框架结构体系,局部大跨度楼盖采用双向交叉平面桁架体系,屋盖采用立体桁架。各层空间关系较为复杂,具有扭转不规则、楼板不连续、结构超长、错层等特点。结构设计采用基于性能的抗震设计方法,采用YJK、PMSAP和MIDAS Gen进行弹性分析和比较,应用Paco-spa软件进行动力弹塑性分析。此外,对大跨度楼盖的舒适度、钢结构楼屋盖的整体稳定性、关键节点、楼屋盖的防倒塌能力以及超长结构的温度应力、薄弱楼板应力进行了专门分析。并根据分析结果对结构的关键部位和构件采取针对性的加强措施。计算结果表明,结构的各项指标满足规范和既定抗震性能目标要求,结构设计合理、安全可行。

The Olympic ice and snow center in Baotou is a out-of-code high-rise building.A frame structure is adopted for the bottom concrete part of the structure,a two-way cross plane truss systems is used for the part of floor which has a longer span,and a three-dimensional truss is used for the roof.The spacial relationship between each floor is relatively complicated,thus the structure has properties such as torsional irregularity,inconsistent floor slab,structure over-length and contains staggered-floor.Performance-based seismic design method was adoptd in structural design.YJK,PMSAP and MIDAS Gen were used to perform elastic analysis and comparisons for the structure,and Paco-spa was used to carry out a dynamic elastoplastic analysis.In addition to the above analysis,special analysis on the comfort level of long-span floor slab,overall stability of steel floor and roof,key joints,collapse resistance of floor and roof was conducted,as well as the special analysis on the temperature stress and weak floor slab stress.According to the analytical results,targeted strengthening measures were adopted for the key areas and key members of the structure.It is shown by the calculation results that all indicators of the structure meet the requirement of standard and the stated goal of its seismic performance design,the design of the structure is reasonable,safe and feasible.