摘要
为满足北京大兴国际机场航站楼少柱、大空间的建筑需求,提出一种以可独立承载的大型子结构单元为基础、支承体系与屋盖结构一体化的巨型网格结构。并就结构设计中的关键问题,进行了竖向承载能力、水平抗侧能力、防连续倒塌、抗震性能研究及竖向地震作用分析,结果表明:以若干独立承载的大型子结构单元为基础构建的体系可大幅提升结构的承载能力和抗倒塌能力;两个支撑筒或支撑框架与C形柱组成三角形支承结构,承载力可提升300%以上;子结构之间的屋盖结构对巨型网格结构的传力机制影响较大,应考虑子结构独立模型和整体模型进行承载力包络设计;当支承构件承担的地震剪力小于其承担的重力荷载比例时,应对支承构件承担的地震剪力进行调整,以提高支承构件的抗侧能力;针对构件和支承系统层面的抗连续倒塌分析可有效评估不同构件和C形柱的重要性等级;采用静力法计算大跨屋盖的竖向地震响应偏小,应采用振型分解反应谱法或动力时程分析法进行复核;采用基础与层间结合的超大平面隔震技术可有效提高巨型网格结构的抗震能力。
In order to create a column-free open space for architectural performance of Beijing Daxing International Airport Terminal,a mega grid structural system that seamlessly integrated the supporting structure and roof structure was proposed based on several large-scaled substructure units which have independent load bearing capacity.The key issues,such as vertical and lateral bearing capacity,anti-progressive collapse capacity,seismic resistance capacity of this structural system were studied and the vertical seismic response was analyzed.The results indicate that the structural system created through integration of several large-scaled substructure units which have independent load bearing capacity has significantly improved load bearing and anti-progressive collapse capacity.The triangular supporting system,which is created through combination of the C-shaped columns and two supporting cores or braced supporting frames,has significantly improved the bearing capacity by more than 300%.The connecting elements between substructure units have critical effects on the loading mechanism of the mega structure,therefore both individual substructure unit model and global model should be designed simultaneously to provide enveloped design.The seismic shear force apportioned by the roof supporting elements should be adjusted if the proportion is smaller than the proportion of gravity loading they withstand,so as to improve their lateral resistance capacity.The anti-progressive collapse analysis conducted for both supporting structural system level and structural element level can provide an effective assessment for the importance level of different C-shaped columns and structural elements.The vertical seismic response calculated through static method is underestimated,mode-superposition response spectrum method or dynamic time history analysis method should be used for validation.The combination of base and interlayer seismic isolation technology can effectively improve the seismic resistance capacity of the mega grid structural system.
作者
朱忠义
束伟农
周忠发
邓旭洋
秦凯
张琳
王哲
梁宸宇
ZHU Zhongyi;SHU Weinong;ZHOU Zhongfa;DENG Xuyang;QIN Kai;ZHANG Lin;WANG Zhe;LIANG Chenyu(Beijing Institute of Architectural Design,Beijing 100045,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第4期1-10,共10页
Journal of Building Structures
基金
北京市科技计划课题(Z161100005116009)。
关键词
大跨空间网格结构
C形柱
大型子结构单元
一体化巨型网格结构
二道防线
long-span grid structure
C-shaped column
giant substructure unit
integrated giant grid structure
dual line of defense
