斜腹板薄壁箱梁横向内力分析及其参数影响研究

发布时间：2018-03-21 16:44

本文选题：薄壁箱梁　切入点：横向内力　出处：《铁道学报》2017年03期 　论文类型：期刊论文

【摘要】：基于薄壁箱梁畸变理论,考虑畸变位移与框架位移之间的协调条件,建立斜腹板单箱单室箱梁横向内力计算的解析公式。在刚性支承框架分析基础上,通过引入横向弯矩修正系数,反映箱梁畸变变形对横向弯矩的影响。详细分析竖向偏心荷载作用下,斜腹板倾斜程度及梁高变化对横向弯矩的影响规律。研究结果表明:按文中公式求得的箱梁横向弯矩与有限元软件Ansys壳单元计算结果吻合良好,从而验证了本文公式的正确性;在通常的偏心荷载作用下,当斜腹板的俯角约为12°,箱室高宽比约为0.55时,顶板的横向弯矩峰值最小;随着俯角及高宽比的增大,离偏心荷载较近的顶板角点横向弯矩修正系数逐渐增大,而较远的角点横向弯矩修正系数急剧减小,当俯角及高宽比很大时修正系数均趋近于1。
[Abstract]:Based on the distortion theory of thin-walled box girder and considering the coordination condition between distortion displacement and frame displacement, an analytical formula for calculating transverse internal force of single box box girder with inclined web plate is established. By introducing the correction coefficient of transverse bending moment, the influence of box girder distortion on transverse moment is reflected. The results show that the transverse bending moment of box girder obtained by the formula is in good agreement with the calculation results of finite element software Ansys shell element, which verifies the correctness of the formula. Under the normal eccentric load, the peak value of transverse bending moment of the roof is minimum when the angle of the inclined web is about 12 掳and the ratio of height to width of the chamber is about 0.55, and the peak value of the transverse moment of the roof is minimum with the increase of the angle of deflection and the ratio of height to width. The transverse moment correction coefficient of the corner point near the eccentric load increases gradually, while the lateral moment correction coefficient of the farther corner point decreases sharply, and the correction coefficient approaches to 1 when the ratio of pitch angle and aspect ratio is very large.
【作者单位】：兰州交通大学土木工程学院;
【基金】：国家自然科学基金(51468032,51268029)
【分类号】：U448.213

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