葛店图书馆结构设计

Structure design of Gedian Library

葛店图书馆主体结构高度为20.4m,采用框架-剪力墙结构,平面布置为倒Y字型,结合建筑立面造型和平面布置,三个主要朝向悬挑区域结构布置经过两种不同的方案对比后确定采用密肋钢骨梁悬挑,悬挑梁最大跨度为10.8m。其结构布置存在三项不规则项,运用多个软件进行补充验算和规范公式手算复核:采用YJK软件进行整体小震反应谱计算和中震等效弹性分析,采用Midas Gen软件进行大震静力弹塑性补充分析,对悬挑区域进行人致振动舒适度分析和荷载长期作用混凝土收缩徐变影响分析;结合规范公式选取一榀框架手算复核钢骨梁的抗弯和抗剪承载能力,并验算钢骨梁在不考虑型钢有利作用下的抗扭承载力。分析结果表明,该结构方案具有较好抗震承载能力,能够满足现行规范的要求。

The height of the main structure of the Gedian Library was 20.4 m and adopted frame-shearwall structure system. The plane layout was inverted Y shape, combined with the building facade shape and plan layout, the multi-ribbed steel reinforced concret beam cantilever was adopted in the three main directions after the comparison of two different schemes, the maximum span of the cantilever was 10.8 m. There were three irregular items in the structure layout, so multiple software supplementary checking and manual calculation were used: YJK software was used for small response spectrum calculation and moderate earthquake equivalent elastic analysis, Midas Gen software was used for large earthquake static elastic-plasticity analysis, the human-induced vibration comfort analysis, concrete shrinkage and creep impact analysis under long-term load were used on the overhanging area;combined with the code formula, a frame was selected for manual calculation to recheck the flexural and shear capacity of steel reinforced concret beam, and check the torsional bearing capacity of the steel reinforced beam without considering the advantageous effects of steel. The results show that the structural scheme has sufficient seismic capacity, which can meet the requirements of the existing codes.