| 钢桁架的次应力和极限状态 |
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| 引用本文： | 陈绍蕃. 钢桁架的次应力和极限状态[J]. 钢结构, 2005, 20(4): 1-4 |
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| 作者姓名： | 陈绍蕃 |
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| 作者单位： | 西安建筑科技大学,西安,710055 |
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| 摘 要： | 钢桁架通常按节点铰接对待,但实际构造却经常形成刚性节点。《钢结构设计规范》(GB50017-2003)规定,当杆件高长比超过一定数值时,应考虑节点刚性所引起的次弯矩,但规范并未指出如何计算次弯矩的效应。通过桁架承载能力极限状态的分析,提出了考虑次弯矩时杆件强度和稳定性的计算方法,建议的公式可用于设计工作中。
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| 关 键 词： | 钢桁架 次弯矩 次应力 力矩重分布 塑性铰 强度 稳定 |
| 收稿时间： | 2005-02-05 |
| 修稿时间： | 2005-02-05 |
SECONDARY STRESS AND ULTIMATE STATE OF STEEL TRUSSES |
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| Chen Shaofan. SECONDARY STRESS AND ULTIMATE STATE OF STEEL TRUSSES[J]. Steel Construction, 2005, 20(4): 1-4 |
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| Authors: | Chen Shaofan |
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| Abstract: | Steel trusses are regularly treated as hinged at the joints,but actual constructional detailing often renders the joints rigid."The Code for Design of Steel Structures"(GB 50017-2003) prescribes that if the depth-to-length ratio of a member exceeds a specific value,consideration shall be given to the secondary moment caused by joint rigidity.But,no instructions are given in the Code of how to take account of the effect of the secondary moment.Through analysis of the ultimate state of load carrying capacity of trusses,this study puts forward member strength and stability calculation approach taking account of the secondary stresses,and the suggested formulas can be used in design work. |
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| Keywords: | steel truss secondary moment secondary stress moment redistribution plastic hinge strength stability |
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