EFFECT OF RESTRAINT FOR CONTINUOUS BRACES ON LATERAL BUCKLING LOAD FOR H-SHAPED BEAMS WITH WARPING RESTRAINT OF BEAMS TO COLUMN JOINT
EFFECT OF RESTRAINT FOR CONTINUOUS BRACES ON LATERAL BUCKLING LOAD FOR H-SHAPED BEAMS WITH WARPING RESTRAINT OF BEAMS TO COLUMN JOINT
复制标题
连续支撑约束对梁柱节点翘曲约束的H型梁横向屈曲载荷的影响
DOI：
10.3130/aijs.83.1353
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Wang Liao
中科院分区：
文献类型：
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作者：
Y. Kimura;Mutsumi Miya;Wang Liao
板，有效地防止梁的横向屈曲。本文建立了有翘曲约束和连续支撑的H形梁的弹性侧向屈曲荷载方程。采用能量法和数值分析方法计算了梁的弹塑性侧向屈曲应力、连续支撑的侧向加劲力和转动加劲力矩。在梁侧向屈曲的钢边界条件下，简单箱形抗扭刚度梁柱节点对梁的侧向屈曲具有翘曲约束。阐明了箱形截面柱在有翘曲约束时的侧向屈曲荷载大于简支时的侧向屈曲荷载，箱形截面柱的抗扭刚度与防止翘曲是相对应的。另一方面，大跨度主梁可能由于侧向屈曲载荷而不具有足够的塑性强度，因此应沿着梁设置许多侧向支撑以防止侧向屈曲变形（AIJ 2010）。当非结构构件如折板直接与梁连接时，可作为连续支撑。然而，在日本设计规范中，非结构构件不被视为支撑。Kimura、Yoshino和Ogawa（2013）阐明了当梁的边界条件为简支时，带连续支撑的H形梁的侧向屈曲行为。本文在能量守恒方程中考虑翘曲和圣维南扭转刚度，计算了连续支撑对H形截面梁在均布弯矩作用下弹性侧向屈曲荷载增加的影响。在这项研究中，考虑了两种类型的加载条件，其中上翼缘的压缩载荷大于下翼缘的压缩载荷（加载条件，A型），以及上翼缘的压缩载荷小于下翼缘的压缩载荷（加载条件，
slab which are effective to prevent the lateral buckling of beams. In this paper, the equation of the elastic lateral buckling load for H-shaped beams with warping restraint and continuous braces are developed. Elasto-plastic lateral buckling stresses of the beams and lateral stiffing force and rotational stiffing moment of continuous braces are evaluated by the energy method and numerical analyses. In for steel boundary condition of beams under lateral buckling simple box-shaped torsional rigidity beam-to-column joints have of warping restraint on lateral buckling for beams. elucidated the lateral buckling load with the warping restraint of the column was larger than that with simple support and the torsional rigidity of box sectional columns is corresponding to warping prevention. On the other hand, long span main beams may not possess enough plastic strength due to lateral buckling load, so that many lateral braces should be set up along the beams to prevent the lateral buckling deformation (AIJ 2010). When non-structural members such as folded roof plate are directly jointed to beams, they may be used as the continuous braces. However, in Japanese design code, the non-structural members are not considered as braces. Kimura, Yoshino, and Ogawa (2013) clarified the lateral buckling behavior for H-shaped beam with continuous braces when the boundary condition of the beams is simple support. This paper evaluates the effect of continuous braces on the increase of elastic lateral buckling load for H-shaped beams under the uniform flexural moment, considering warping and Saint-Venant torsional rigidities in energy conservation equations. In this study, two types of loading conditions are considered, where the upper flange’s compressive load is larger than the lower flange’s one (loading condition, Type A), and where the upper flange’s compressive load is smaller than the lower flange’s one (loading condition,