首页> 外文期刊>International journal of structural stability and dynamics >STABILITY EVALUATION OF STEEL CABLE-STAYED BRIDGES BY ELASTIC AND INELASTIC BUCKLING ANALYSES
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STABILITY EVALUATION OF STEEL CABLE-STAYED BRIDGES BY ELASTIC AND INELASTIC BUCKLING ANALYSES

机译:弹性和非弹性屈曲分析法评价钢索式桥梁的稳定性

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The purpose of this paper is to compare the design equation of Allowable Stress Design (ASD) with that of Load and Resistance Factor Design (LRFD) concerning the member stability for the economic design of cable-stayed bridges. Both elastic and inelastic buckling analyses are carried out for the cable-stayed bridges with the effective buckling lengths of the key members calculated. The axial-flexural interaction equations prescribed in ASD and LRFD are used to check the stability of main members in cable-stayed bridges. Parametric studies are performed for the bridges with a center span of 300, 600, 900, and 1200 m of different girder depths. Peak values of the interaction equations are calculated at the intersection between the girder and towers. Since the peak values of the interaction equations by inelastic buckling analysis are less than those by elastic buckling analysis, a more economical design of the girder and towers can be achieved using the inelastic buckling analysis. In addition, the use of LRFD specifications can result in a more economical design by about 20% on average than the ASD specifications for steel cable-stayed bridges.
机译:本文旨在比较斜拉桥经济设计中关于构件稳定性的容许应力设计(ASD)设计公式与荷载和阻力因子设计(LRFD)的设计公式。对斜拉桥进行了弹性和非弹性屈曲分析,并计算了关键构件的有效屈曲长度。 ASD和LRFD中规定的轴向-挠度相互作用方程式用于检查斜拉桥主要构件的稳定性。对中心跨度为300、600、900和1200 m的不同大梁深度的桥梁进行了参数研究。相互作用方程的峰值在大梁与塔之间的交点处计算。由于非弹性屈曲分析的相互作用方程的峰值小于弹性屈曲分析的相互作用方程的峰值,因此使用非弹性屈曲分析可以实现梁和塔的更经济的设计。此外,与钢斜拉桥的ASD规范相比,使用LRFD规范可以平均平均节省20%的设计成本。

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