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新型弦支刚架结构体系的设计与分析
严仁章,陈志华,王小盾,陈强
摘 要
 (天津大学建筑工程学院,天津 300072)
 
[摘要]结合某一实际工程,在对比研究梁柱节点连接形式对弦支刚架结构性能影响的基础上,确定了梁柱节点采用刚性连接的形式。针对风吸荷载较大的情况,分析了弦支刚架的预应力设计方法。鉴于弦支刚架的梁柱-拉索节点受力复杂,设计了补强型梁柱-拉索节点,并建立有限元模型分析其力学性能,验证了补强型梁柱-拉索节点受力的合理性。通过分析弦支刚架的整体力学性能,得到其力学分布规律,同时分析结果还表明,弦支刚架的刚度大,结构变形小。对比弦支刚架与普通门式刚架在相同荷载下的内力表明,相对普通门式刚架上弦梁的跨中弯矩,弦支刚架上弦梁的跨中弯矩减小了69.35%。
[关键词]弦支刚架结构; 预应力设计; 补强型梁柱拉索节点; 结构力学性能
中图分类号:TU394      文献标识码:A      文章编号:1002-848X(2015)05-0025-05
 
Design and analysis of a new cable-supported steel frame structural system
Yan Renzhang, Chen Zhihua, Wang Xiaodun, Chen Qiang
 (School of Civil Engineering, Tianjin University, Tianjin 300072, China)
 
Abstract: Rigid connection of beam-column connection was adopted in an engineering project with the consideration of the effect of beam-column connection on structural behavior of the cable-supported steel frame structure. The pre-stress design method applied in the structure was specifically analyzed due to the relatively large wind load. Considering complex mechanical performance of beam-column-cable joint of the structure, a reinforced beam-column-cable joint was designed and its mechanical behavior was analyzed with finite element model to verify the mechanical feasibility of the joint. The mechanical distribution law of the structure was obtained through overall mechanical proporty analysis of the cable-supported steel frame, and analysis results indicate that the overall stiffness of the structure is large and the structural deformation is small. A comparison of the stress of the cable-supported steel frame and the traditional steel frame without cables shows that the mid-span moment of the upper chord beam of the new structure reduces about 69.35%.
Keywords: cable-supported steel frame structure; pre-stress design; reinforced beam-columncable joint; mechanical property of structure
通讯作者:王小盾,博士,副教授,Email: maodun2004@126.com。
 
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