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目的研究翼缘纵向变厚度工型截面简支梁的构件受力性能,为其进一步参数化分析提供依据.方法采用有限元软件ANSYS对2根翼缘纵向变厚度构件和2根等厚度对比构件进行模拟,研究单点加载和两点加载情况下的承载性能,考虑试验侧向支撑和理想侧向边界条件的影响,并将模拟结果与试验结果进行对比.结果有限元计算结果与试验结果吻合良好,4根构件截面均达到密实截面要求,且翼缘变厚度工型截面梁可以获得更大的强度储备;理想侧向支撑有利于提高构件的整体承载力,相比试验侧向支撑模型提高约5%.结论笔者建立的有限元模型能够合理模拟试验条件,且建议在进一步参数化分析中采用理想侧向支撑边界条件;纵向变厚度钢板节省用钢量以及本身强度优势,用于工型截面受弯构件翼缘可以获得更高的强度储备和更大的经济效益.
Aim To study the mechanical behavior of simple longitudinal girder with flange thickness variation and to provide basis for its further parametric analysis.Methods The finite element software ANSYS was used to measure the longitudinal thickness variation of two flanges and two equal thickness contrast members The effects of the lateral support and the ideal lateral boundary conditions are considered, and the simulation results are compared with those of the test results.Results The results of the finite element analysis are in good agreement with the experimental ones Good, the cross-sections of the four components all meet the requirements of dense cross-section, and the strength-type cross-section beams with larger flange thickness can obtain more strength reserves; the ideal lateral support is beneficial to improve the overall bearing capacity of the component, About 5% .Conclusion The finite element model established by the author can reasonably simulate the experimental conditions, and recommends the use of the ideal lateral support boundary conditions in further parametric analysis; longitudinal variable thickness steel plate to save the amount of steel and its strength advantages for the type The flexural members’ flanges can achieve higher strength reserves and greater economic benefits.