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工程力学  2012 

简支槽形梁考虑空间受力的理论解

DOI: 10.6052/j.issn.1000-4750.2011.03.0104, PP. 64-71

Keywords: 槽形梁,势能驻值原理,整体弯曲,局部弯曲,剪力滞,主梁扭转

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Abstract:

该文在综合考虑槽形梁的整体弯曲、局部弯曲、剪力滞效应和主梁扭转作用的基础上,用势能驻值原理导出了简支槽形梁在均布荷载作用下的解析解。通过与有限元计算结果的对比,验证了理论解的正确性和适用性。通过算例分析发现:随着高宽比或宽跨比的增大,局部弯曲对道床板纵向正应力的贡献增大;算例采用的截面尺寸剪力滞效应非常明显,槽形梁的宽跨比对道床板的有效宽度系数影响显著;是否考虑主梁扭转对最终的计算结果影响不大。

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