腹板开孔复杂卷边冷弯薄壁槽钢受弯构件稳定性试验研究  

Experimental investigation on stability behavior of channel flexural members with complex edge stiffeners and web holes

作　　者：王春刚[1] 梁润嘉 张壮南[1] 贾连光[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《建筑结构学报》2014年第4期125-134,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51008200);辽宁省高等学校优秀人才支持计划项目(LJQ2011059);沈阳市科技计划项目(F12-277-1-31)

摘　　要：为了研究腹板开孔对不同截面形式冷弯薄壁型钢受弯构件稳定性能的影响,对腹板开孔的复杂卷边槽钢(B1截面)、形复杂卷边槽钢(B2截面)共计8个简支梁试件进行稳定性试验研究,其中研究纯弯的试件4个,非纯弯的试件4个。试验结果表明:B2截面试件的受弯承载效率均高于B1截面试件,B1截面试件受开孔的影响较大,而B2截面试件由于腹板加劲肋的设置减弱开孔对截面的影响,两者在开孔处均发生明显的剪切变形。与相同条件下不开孔试件的试验结果对比表明:开孔试件的极限荷载均有不同程度的降低,非纯弯状态的下降幅度大于纯弯状态的;开孔试件的失稳模式基本不变,但破坏位置多发生在孔洞截面处。对试验进行有限元模拟分析,计算结果与试验结果吻合良好。在此基础上,利用有限元模拟对比相同截面腹板开孔和不开孔受弯构件的应力分布云图,结果表明,孔洞的存在改变了构件的应力分布,使孔洞周边区域发生应力集中现象,B1截面开孔受弯构件最大应力主要集中在弯剪段孔洞附近,而B2截面开孔后最大应力则主要集中在荷载作用点附近的受压翼缘上。A total of eight simply supported bending members with two types of complicated sections including channels with complex edge stiffeners and web holes （Bl-section） , channels with complex edge stiffeners and type web stiffeners and web holes （B2-section） were tested, for studying the effect of web holes on different sections flexural members. The specimens included four pure bending members and four non-pure bending members. The experimental results show that all the bending strength of B2-section specimens are higher than those of Bl-section and shear deformation can be obviously observed in both Bl-section and B2-section specimens. Furthermore, compared with BI- section specimens, the influence of web holes is reduced because of the setting of web stiffeners for B2-section. On the same condition, compared with the specimens without holes, the failure modes of specimens with web holes do not change, but the failure position always appears on the cross section of holes. The bending strength of specimens with holes is lower, especially the B2-section specimens. The finite element analysis （FEA） results show good agreement with test results in terms of bending strength and buckling mode. The stress distribution of the beams with web holes were compared with beams without web holes under the same condition by FEA. It is shown that the web holes change the stress distribution of the specimens. The positions of the maximum stress of Bl-section and B2-section specimens are near the holes and on the compression flange near loading points respectively.

关 键 词：复杂卷边槽钢 受弯构件 腹板开孔 静力试验 稳定性能 

分 类 号：TU392.1[建筑科学—结构工程] O344.7[理学—固体力学]