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首页> 外文期刊>Romanian Journal of Transport Infrastructure >Comparative Study Between Experimental Results and the Numerical One of the Lateral Buckling Resistence for the Two Curved I Girders of a Curved Bridge Model
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Comparative Study Between Experimental Results and the Numerical One of the Lateral Buckling Resistence for the Two Curved I Girders of a Curved Bridge Model

机译：弯曲桥梁模型的两条弯曲工字梁的横向屈曲数值与试验结果的比较研究。

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This article deals with the problem of lateral buckling of curved I girders used in bridge structures. Lateral buckling resistance will be evaluated, by a geometrically and physically nonlinear analysis, using the computer program Lusas?, without considering imperfections of execution. In order to validate the analytical results, numerical study will be performed on a physical model presented in paper [1] which provides values of experimental tests. The geometry of the physical model presented in paper [1] is based on a dimensional analysis of a curved girder used frequently for bridges construction. The physical model consists of two curved I girders, double symmetrical, provided with cross beams and upper and lower bracings. Each end cross beam has welded in girder axis direction a short cantilever beam with length value e. The model girder is supported on a roller at one end and a pin at the other, which are disposed on chord direction. The short cantilever beams are loaded by hydraulic presses with a force P, which causes constant bending moment with value P *e and shear zero. The nonlinear analysis uses the Total Lagrangian formulation and the Crisfield modified arc length method. The numerical model also considers nonlinear behavior of the material. Resistance to lateral buckling assessment consists in determining the critical bending moment for which the beam is losing stability. The comparison of numerical with the experimental results, confirms the possibility of using the numerical evaluation for estimating the lateral buckling resistance for curved bridge girders.
机译：本文讨论了桥梁结构中使用的弯曲工字梁的横向屈曲问题。可以使用计算机程序Lusas？通过几何和物理非线性分析来评估横向屈曲阻力，而无需考虑执行的缺陷。为了验证分析结果，将对论文[1]中提供的物理模型进行数值研究，该模型提供了实验测试的值。论文[1]中提出的物理模型的几何是基于对桥梁施工中经常使用的弯曲梁的尺寸分析。物理模型由两个对称的曲线工字梁组成，两个对称的工字梁具有横梁以及上下支撑。每个端部横梁在梁的轴向焊接有长度为e的短悬臂梁。模型梁的一端支撑在滚子上，另一端则支撑在沿弦方向的销上。短的悬臂梁由液压机加载力P，力P恒定，弯矩值P * e，剪切力为零。非线性分析使用总拉格朗日公式和Crisfield修改弧长方法。数值模型还考虑了材料的非线性行为。抵抗横向屈曲的能力在于确定梁失去稳定性的临界弯矩。数值与实验结果的比较，证实了使用数值评估来估算弯桥大梁的抗侧弯能力的可能性。

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