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Study on Bracing Member for Steel Member and Frame considering Coupled Buckling

考虑耦合屈曲的钢框架支撑件研究

基本信息

批准号：
13650625
负责人：
ONO Tetsuro
金额：
$ 2.5万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The purposes of this study are to explain structural properties of bracing members and design concept and rule for limit state on structural design for steel structures. On the design of bracing members, the couple buckling on members and connection.The object for analysis is steel members having the bracing members on tension side only.Firstly, the factors that affect bracing requirements for buckling strength and deformation capacity on the limit state for design criteria.Numerical analysis is finite element method considering lateral buckling and local buckling. Concept of element are used shell element and beam element. Analytical parameters are bracing rigidities, bracing detail, beam section, and loading condition.When the tension flange alone of a solid web member is braced, it is necessary to pay full attention not only to the above mentioned axial force, but also to the bending moment. If the bending moment is taken as bending moment due to the lateral torsion deflection of the compression flange, it can be considered as bracing moment M=Fh when 2.5% of the yield axial force is imposed as horizontal force F.Therefor, due care must be exercised when joining and attaching members restraining inner chord members in tension to the truss members.The effects of repeated loading for strength and deformation capacities are decrease these capacities. Especially, on tension sides only bracing the effects are large.The relationships of brittle fractures on connection and buckling of member are related strain level of member end, To escape the brittle fracture at connection wide-thickness ratio are large within to buckling strength,The recommendations do not address the bracing requirements for moment redistribution or ductility in seismic design.After local buckling the cross section is unsymmetrical and vertical loads develop very significant out of plane loading components.

本研究的目的是解释钢结构支撑构件的结构特性和极限状态的设计理念和规则。在支撑构件的设计上，包括构件上的耦合屈曲和连接。分析对象是仅在受拉侧有支撑构件的钢构件。首先，设计准则的极限状态下影响支撑对屈曲强度和变形能力要求的因素。数值分析是考虑横向屈曲和局部屈曲的有限元方法。单元的概念采用壳单元和梁单元。分析参数有支撑刚度、支撑细节、梁截面和荷载条件。当实体腹杆的受拉翼缘单独支撑时，不仅要充分注意上述轴向力，还要充分注意弯矩。如果将弯矩视为由于受压翼缘的横向扭转挠度而产生的弯矩，则当将屈服轴向力的2.5%施加为水平力F时，可以将其视为支撑力矩M=Fh。因此，在将受拉约束的内弦杆构件连接到桁架构件时必须小心谨慎。重复加载对强度和变形能力的影响会降低这些能力。特别是在受拉侧仅支撑影响较大。连接处脆性断裂与构件屈曲的关系与构件端部应变水平有关，为了避免连接处的脆性断裂，宽厚比在屈曲强度范围内较大，建议没有解决抗震设计中对力矩重新分布或延性的支撑要求。局部屈曲后截面不对称，竖向荷载在平面外荷载中发展非常显着成分。