大跨度复杂钢屋盖与下部结构的协同分析和设计
Synergistic Analysis and Design of Large-Span Complex Steel Roof with Supporting Structure
以海南国际会展中心二期工程为例,对大跨度空间网格结构与下部结构组成的复杂混合结构进行了屋盖简化模型和考虑协同工作的整体模型的计算与分析。介绍了本工程的建筑和结构设计特点,阐述了屋盖简化计算模型的建立原则和整体计算模型的建立过程,并对二者计算结果进行了对比,重点分析了产生偏差的原因,最后给出了针对此类结构的设计建议。结果表明:通过求下部结构侧移刚度来初步确定屋盖简化模型的弹性支承刚度方法可行,但并不能完全模拟下部结构的特性,并会使杆件应力产生偏差;采用多种软件的协同设计方法高效便捷;基于整体模型的二次满应力优化的结果经济可靠。本工程的设计经验和结论可为此类大跨度复杂钢屋盖的设计提供参考。
Taking the Phase II project of the Hainan International Convention and Exhibition Center as a case study, the complex hybrid structure, which consists of a large-span spatial grid and its supporting structural system, is analyzed using both a simplified roof model and an integrated model that accounts for composite interaction. This paper outlines the architectural and structural design features of the project, explains the modeling principles for the simplified roof computational model and the development process of the integrated model, and compares the results from both approaches. Special attention is given to investigating the causes of discrepancies between the models, with corresponding design recommendations proposed for such structural systems. The results indicate that: determining the elastic support stiffness in the simplified roof model by calculating the lateral stiffness of the supporting structure is feasible, though incomplete simulation of the supporting system’s behavior may lead to deviations in member stresses; the collaborative design method employing multiple software tools proves efficient and practical; and the second-stage full-stress optimization based on the integrated model yields outcomes that are both economical and reliable. The design experience and findings presented herein can provide a useful reference for the design of similar large-span complex steel roof structures.
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中国建筑科学研究院有限公司应用技术研究项目(20140120330730060)
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