郑州国际文化交流中心会展中心不规则超长框架-大跨屋盖结构设计

Irregular super-long frame-large-span roof structure design of Zhengzhou International Cultural Exchange Center Exhibition Center

郑州国际文化交流中心会展中心采用钢筋混凝土框架-大跨度网架屋盖结构体系。抗浮设防水位较高,展厅地上空旷空间范围需要抗浮设计,采用柱下集中布置抗拔桩满足局部及整体抗浮稳定及其他抗浮要求,跨度较大抗水板跨中布置抗拔桩减小配筋;结构体系为下部混凝土,上部钢结构的混合结构,采用YJK及3D3S软件建立符合实际的模型进行整体计算分析;地上结构为抗震特别不规则结构,采用抗震性能化设计加强抗震性能,大震弹塑性结果显示结构满足大震不倒要求;配筋较大的框架柱采用四级钢并筋方式避免了柱内钢筋密集或柱内设置型钢的问题;混凝土结构超长且楼板局部不连续,考虑温度作用及中震不屈服进行楼板设计,结合等值线结果进行包络配筋;大跨度钢屋盖采用双层四角锥网架,焊接球节点,考虑长悬挑对大跨度的有利影响进行多模型包络设计;网架支座采用弹性双向活动支座(建筑钢结构球型支座)减轻对主体结构的影响。针对不规则超长框架-大跨屋盖会展建筑每一处关键问题都进行了详细对比分析设计,可供同类结构设计参考。

Zhengzhou International Cultural Exchange Center adopts reinforced concrete frame-large-span space grid roof structure system.Fortification water table against uplift is high,and the open space range of the exhibition hall needs anti-floating design.The piles against uplift are arranged under the column to meet the local and overall stability against uplift and other anti-floating requirements,layout of piles against uplift in midspan of large-span slab against uplift to reduce reinforcement.The structural system is a mixed structure of lower concrete and upper steel structure.The actual model is established by YJK and 3D3S software for overall calculation and analysis.The above-ground structure is a special irregular seismic structure,and the seismic performance is strengthened by performance-based seismic design.The elastic-plastic results of rare earthquake show that the structure meet the requirement of no collapsing under rare earthquake.The frame columns with large reinforcement adopts the merged fourth-level steel bars to avoid the problem of dense reinforcement in column or section steel in column;the concrete structure is super-long and the floor is partial discontinuous.Considering the temperature action and the unyielding in design earthquake,combined with contour results the reinforcement taking bigger values.The large-span steel roof adopts double-layer square pyramid space grid structure,welded spherical joints,and multi-model envelope design considering the favorable influence of long cantilever on large-span.The space grid bearing adopts elastic bidirectional active bearing(spherical bearing of steel building structure)to reduce the influence on the main structure.Detailed comparative analysis and design are carried out for each key problem of irregular super-long frame-large-span roof exhibition buildings,which can be a reference for structural design of similar projects.