Abstract

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Title:: Study of Design Method of Bearing Stiffener of I-shaped Girders with Sinusoidal Corrugated Webs

Author(s):: TONG Jing-zhong; GUO Yan-lin; Department of Civil Engineering, Tsinghua University

Keywords:: ]sinusoidal corrugated web; I-shaped girder; bearing stiffener; out-of-plane stability; equivalent constraint length; load-carrying capacity

Abstract:: The authors focused on the load-carrying capacity of bearing stiffener of I-shaped girders with sinusoidal corrugated webs. Through analyzing the force mechanism, the bearing stiffener was classified by different force status, and the numerical analysis of finite element model using ANSYS software was carried out. Through substituting the sinusoidal corrugated webs for equivalent constraint length of ordinary flat web, the bearing stiffener associated with the equivalent constraint length was simplified as the axial-compression-loaded column to verify its stability. Based on parametric studies, correlativity of the equivalent constraint length of sinusoidal corrugated webs with height-thickness ratio and amplitude-wavelength ratio of sinusoidal corrugated webs were revealed, and the calculation formulae of equivalent constraint length of sinusoidal corrugated webs for beam-end bearing stiffener and beam-middle bearing stiffener were established. The results show that with greater flexural stiffness of sinusoidal corrugated webs in out-of-plane of webs and with smaller axial compression stiffness in in-plane of webs, the out-of-plane constraint of bearing stiffener is lack and the stability calculation should be checked with more insufficient constraint than flat webs. The design method of bearing stiffener of I-shaped girders with sinusoidal corrugated webs proposed in the paper has better safety and economy.