本文選題：薄壁箱梁　切入點(diǎn)：橫向內(nèi)力　出處：《鐵道學(xué)報(bào)》2017年03期 　論文類型：期刊論文

【摘要】：基于薄壁箱梁畸變理論,考慮畸變位移與框架位移之間的協(xié)調(diào)條件,建立斜腹板單箱單室箱梁橫向內(nèi)力計(jì)算的解析公式。在剛性支承框架分析基礎(chǔ)上,通過引入橫向彎矩修正系數(shù),反映箱梁畸變變形對橫向彎矩的影響。詳細(xì)分析豎向偏心荷載作用下,斜腹板傾斜程度及梁高變化對橫向彎矩的影響規(guī)律。研究結(jié)果表明:按文中公式求得的箱梁橫向彎矩與有限元軟件Ansys殼單元計(jì)算結(jié)果吻合良好,從而驗(yàn)證了本文公式的正確性;在通常的偏心荷載作用下,當(dāng)斜腹板的俯角約為12°,箱室高寬比約為0.55時(shí),頂板的橫向彎矩峰值最小;隨著俯角及高寬比的增大,離偏心荷載較近的頂板角點(diǎn)橫向彎矩修正系數(shù)逐漸增大,而較遠(yuǎn)的角點(diǎn)橫向彎矩修正系數(shù)急劇減小,當(dāng)俯角及高寬比很大時(shí)修正系數(shù)均趨近于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 擄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.
【作者單位】： 蘭州交通大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金(51468032,51268029)
【分類號(hào)】：U448.213

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