摘要
根据乌氏第二理论对波纹钢腹板预应力混凝土箱梁的扭转性能进行了研究,分析了箱梁截面在偏心荷载作用下的约束扭转和畸变特性,建立了空间有限元模型,并对理论分析进行了验证。分析结果表明:在偏心荷载作用下,由约束扭转产生的翘曲正应力为弯曲应力的5.9%,跨中截面钢腹板剪应力为弯曲剪应力的14.8%,由畸变引起的翘曲正应力为弯曲正应力的29%;针对跨径较小的简支梁,畸变产生的翘曲正应力约为约束扭转产生的翘曲正应力的5倍;偏载引起的效应在整体效应中所占的比重较大,在计算过程中不可忽略。
The second theory of A. A. Umanskii was adopted to study torsional property of composite beam with corrugated steel webs. The torsional and distortional property of box girder under eccentric load was analyzed. The result of the theoretical method was verified by the finite element method. The results show that the warping stress caused by restrained torsion is 5.9 of that caused by bending. The shear of the corrugated steel webs caused by restrained torsion is 14.8o//oo of that caused by bending. The warping stress caused by distortion is 29~/oo of that caused by bending. Based on the simple-supported beam referred in this paper, the warping stress caused by distortion is 5 times of that caused by restrained torsion. The effect caused by the eccentric load which possesses larger share of the calculation should not be ignored. 3 tabs, 13 figs, 9 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第3期58-63,76,共7页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200431822315)
关键词
桥梁工程
波纹钢腹板
箱梁
扭转性能
畸变
翘曲正应力
bridge engineering
corrugated steel web
box girder
torsional property
distortion
warping stress
