大跨转换桁架结构分析与设计
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（1 北京富力城房地产开发有限公司， 北京100022; 2 西北大学基建处， 西安 710127）
［摘要］哈尔滨富力江湾新城裙房公建区酒店宴会厅上方为跨度36m的转换桁架，其结构设计存在承担竖向荷载大、桁架高度受限、需要二次转换、转换层楼板应力大等难点。从受力和变形控制角度对转换桁架立面形式进行对比，选择了斜腹杆中部一拉一压、端部交叉布置的立面形式。支承桁架的型钢混凝土转换柱不同于常规转换柱，为大偏心压弯构件，通过分析对比，采取端部下弦杆后连接设计、分阶段加载、释放恒载作用下产生的下弦弯矩和对转换柱的剪力，解决了型钢混凝土转换柱受压区高度较大的问题。在对转换结构进行常规分析之外，补充了小震、大震时程分析，进行了转换结构整体和构件弹性屈曲分析，对型钢混凝土转换柱的承载力和抗震性能水准进行了评估，对上弦杆与楼板协同工作进行了分析，并进行了转换桁架抗连续倒塌分析。在全面分析的基础上，总结了转换桁架的结构设计要点和设计措施。［关键词］转换桁架; 后连接; 稳定性; 屈曲分析; 抗连续倒塌中图分类号：TU318， TU323.4 文献标识码：A 文章编号：1002-848X(2016)11-0021-06
Analysis and design of large-span transfer truss structureZhao Jianmin1, Zhang Jianping2, Wu Zhaohua1(1 Beijing R & F Properties Development Co., Ltd., Beijing 100022, China; 2 Infrastructure Management Department, Northwestern University, Xi'an 710127, China)Abstract: There is a 36m-span transfer truss located above the hotel banquet of the public region in skirt building of Fuli Jiangwan Newtown in Harbin. There are some difficulties in structural design, including the great vertical loads, limited height of truss, need of the second transfer and high slab stress on transfer story, etc. Different elevations of the transfer truss were compared through perspectives of the mechanism and deformation control, and the elevation form adopts one tension web member by one pressure web member in the middle part and cross web members on the ends. The steel-reinforced concrete column which supports the transfer truss is different from the conventional transfer column, and it belongs to large eccentric compression member. Through analysis and comparison, the post-connection design method of the end bottom member chord was used. The load was loaded by stages and the moment of bottom chord and the shear force on transfer column due to dead load action were released, which solved the problem of high compression height of compression region for steel-reinforced concrete transfer column. In addition to routine analysis on transfer structure, the time-history analyses under the frequent earthquakes and rare earthquakes were supplemented, the elastic buckling analyses of the whole transfer structure and members were applied, the bearing capacity and the seismic performance level of the steel-reinforced concrete transfer column were evaluated, the co-working of the top chord and slab was analyzed, and the progressive collapse resistance analysis on transfer truss was applied. On the basis of comprehensive analyses, the key structural design points and design measures of the transfer truss was summarized.Keywords:transfer truss; post-connection; stability; buckling analysis; progressive collapse resistance
作者简介：赵建敏，学士，工程师，Email:sephawk@126.com。
