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大型箱梁翼缘开洞有限元分析 |
刘霞1,李宗利1,贾仕开2
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1. 西北农林科技大学水利与建筑工程学院,陕西,杨凌,712100 2. 中国水电顾问集团成都勘测设计研究院,四川,成都,610072
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摘要: |
应用有限元法分析了大型双腹箱形开洞梁,以孔洞宽度和位置为变量,探讨孔洞对梁的应力、应变及跨中挠度的影响规律.研究结果表明,随着洞位置向跨中移动,以及洞宽度的增大,跨中挠度增大较快.当孔洞与支座的距离大于0.3倍跨度时,跨中最大正应力会突然减小,但小于0.3倍跨度时,开洞对跨中最大正应力影响不大.随着孔洞断面宽度的增大,开洞断面下翼缘正应力逐渐增大,与材料力学计算结果差异越来越大,但该断面的剪应力却与材料力学计算值较为接近.最后,比较有限元计算值与材料力学计算值,得出修正系数供设计参考. |
关键词: 双腹箱形梁 翼缘开洞 有限元分析 修正系数 |
DOI: |
分类号:TB302 O241.82 |
基金项目: |
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Finite element analysis of large size box beam with flange openings |
LIU Xia1,LI Zong-li1,JIA Shi-kai2
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Abstract: |
The large size double-web box beam with various holes at bottom flange is analyzed by using finite element method. The law of stress-strain and mid-span deflection is investigated regarding the width and position of holes as variables. Results show that the mid-span deflection is intensive along with the holes moving toward mid- span and the width increment of holes. When the distance from hole to steadier exceeds 30% of the beam length, the normal stress of the mid-span will greatly weaken. But if the distance is less than 30% of the beam length,the influence of holes on normal stress of mid-span wont make much difference. The normal stress of profile in bottom flange and the difference between mechanics of materials and finite element analysis results increase as the width of holes increases,but the difference in the shear strength of this profile is approximate. At last,a simple comparison is made between FEA results and materials mechanics results, and the correction coefficient is thus obtained for design. |
Key words: double-web box beam flange openings finite-element analysis correction coefficient |