大跨度钢、木混合结构屋盖设计并基于实例分析对抗震性能的研究

Roof Design for Large-span Steel-Wood Hybrid Structures and the Seismic Performance Based on Actual Cases

摘要:

为有效提高建筑中屋盖的抗震性能、节约建筑施工成本，深入研究大跨度钢、木混合结构屋盖的抗震性能。基于一个工程实例对该问题进行研究。分析从基本周期与抗侧刚度比、地震作用估算、承载力设置、抗震变形验算、连接与基础设计五个测试参数展开，在此基础上确定预应力拉索的地震响应及张拉控制应力。设计的混合屋盖是使用4道X形布置的屋面预应力主索与外柱斜拉索结构，这样是确保屋盖结构在地震下能够有效工作，根据该结构结合一工程实例展开大跨度钢、木混合结构屋盖抗震性能测试。实验结果表明，大跨度钢、木混合结构屋盖相对单一结构屋盖而言，抗震性能更强；同时实例分析表明，在多向地震输入下大跨度钢、木混合结构屋盖的各个构件中，内柱是抗震性能较弱的部位。

Abstract:

To effectively improve the seismic performance of roofs in buildings and save the construction cost, the seismic performance of the roof of a long-span steel-wood hybrid structure is deeply studied based on an engineering case. The seismic response and tension control stress of pre-stressed cables are determined according to five test parameters, namely, the lateral stiffness ratio, the estimation of seismic action, the setting of bearing capacity, the checking of seismic deformation, and the connection and foundation design. The hybrid roof designed in this study ensures that the roof structure can be subjected to frequent and rare earthquakes. Based on an engineering example, the seismic performance test of a long-span steel-wood hybrid structure roof is carried out according to the effective work. The experimental performance test results show that the seismic performance of the long-span steel-wood hybrid structure roof is stronger than that of a single-structure roof. Moreover, the case study shows that the seismic performance of the inner column is weaker than those of other members of the long-span steel-wood hybrid structure under multidimensional earthquakes.