牛河梁红山文化遗址群Ⅱ号点保护篷钢结构性能化设计

Performance-based design on steel structure for the protection shed of Niuheliang No.2 archaeological site

对采用径向限位滑动支座的牛河梁红山文化遗址群Ⅱ号点保护篷钢结构进行了抗震性能设计,比较了不同支座形式及支撑体系对结构整体稳定性能的影响,同时分析了结构的静力延性性能,并对结构进行了抗连续倒塌设计。分析结果表明,采用限位滑动支座不会对结构的稳定性能产生较大不利影响;支撑体系对结构的稳定性能影响很大,桁架下弦必须全跨布置系杆;结构体系满足静力延性性能设计目标,且有很好的抗连续倒塌能力。

A methodology for seismic performance design of steel shed of Niuheliang No. 2 archeological site supported by radial limit sliding bearings was described. The impacts to structure overall stability produced by different bearings and support systems were compared, the static ductility and progressive collapse prevention capacity of the main structure were also analyzed. Analysis results indicate that using the limit bearings has little adverse effect on structural performance, only the impacts of support systems are remarkable, tie bars must be lay through the span of the truss bottom chord, the designed structure satisfy the design goal of static ductility, and possess the capacity of progressive collapse prevention.