共查询到19条相似文献,搜索用时 156 毫秒
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为了更加准确地评估钢桥面板的疲劳性能,提出基于热点应力法的钢桥面板疲劳分析及验算方法。该方法针对所分析的正交异性钢桥面板,首先利用有限元软件建立桥面系模型,然后采用热点应力法得到验算部位的应力历程,最后根据泄水法计算相应的热点应力幅并进行疲劳验算。以某三塔四跨双层钢桁梁悬索桥为例,针对该桥采用的正交异性钢桥面板,利用本文提出的方法开展了钢桥面板疲劳有限元分析及验算。结果表明:对于所选取的4种钢桥面板典型疲劳细节,其最大应力幅均低于对应的常幅疲劳极限,说明该桥采用的正交异性钢桥面板的疲劳性能满足设计要求。 相似文献
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高速铁路钢桁梁桥正交异性整体钢桥面板有效宽度的计算原则 总被引:2,自引:0,他引:2
对比现有国内外钢桥设计规范中计算钢桥面板有效宽度的计算方法和公式。分析普通铁路钢桁梁桥纵横梁明桥面系和高速铁路钢桁梁桥正交异性整体钢桥面系传力途径和受力特点的不同。得出现有规范中的公式只能计算平面受弯构件,如简支梁和连续梁的有效宽度,不适用于正交异性整体钢桥面系杆件的结论。在上述基础上,提出了计算正交异性整体钢桥面板有效宽度的原则。 相似文献
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采用通用有限元分析软件ABAQUS建立某钢桥箱梁的计算模型,分析了几种不同的纵肋截面形式对正交异性钢桥面板构造细节处应力分布的影响,并根据分析结果推荐相对较优的钢桥面板布置形式。 相似文献
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采用通用有限元分析软件ABAQUS建立某钢桥箱梁的计算模型,分析了几种不同的横隔板挖孔形式对正交异性钢桥面板构造细节处应力分布的影响,并根据分析结果推荐相对较优的钢桥面板布置形式。 相似文献
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针对一种新型的拉挤成型FRP(纤维增强复合材料)桥面板型材进行了静载极限承载力试验分析,并通过有限元软件(ANSYS)进行了有限元仿真模拟,试验与有限元分析对比验证得出此FRP型材的破坏模式,并为FRP桥面板型材的实际工程设计与工程应用提供依据。 相似文献
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The finite element analysis of an orthotropic steel deck panel with trough stiffeners, subjected to local wheel loading, is described. A suitably adapted three-dimensional quadrilateral shell element enabled a prediction to be made of the detailed stress distribution in the area of the deck-plate-to-stiffener weld.The predicted stresses agreed well with measurements made on a 2 m × 1 m test panel taken from a full size bridge deck and were considered accurate enough for a satisfactory assessment to be made of the fatigue life of the deck-plate-to-stiffener weld.The method was used to analyse full width deck panels and it was shown that the stresses decks with Vee-stiffeners were up to 40 per cent lower than those with trapezoidal stiffeners. 相似文献
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由理论分析得出与实桥相应的桥面板模型,利用大型有限元分析软件ANSYS进行计算分析,并与试验得出的结果进行比较,验证了试验的可靠性。通过对钢—混凝土组合桥面板的挠度试验,得出其在静力荷载和疲劳荷载作用下的挠度发展情况。 相似文献
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公路铁路两用桥是混凝土公路桥面板与钢桁架相结合的板桁共同作用的组合结构。通过对某公路铁路两用桁梁斜拉桥进行空间有限元计算分析,探讨了混凝土桥面板体系对结构受力性能的影响和混凝土桥面板徐变的影响,并通过与钢桥面板比较,证明了混凝土桥面板的优越性。 相似文献
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R.M. Mohamed Ali 《Journal of Constructional Steel Research》2008,64(9):1046-1058
A simplified analytical model for deck plates of offshore topsides structures is proposed. Based on the theory of virtual work and an assumed deformed shape function in Cartesian coordinates, a set of equilibrium equations in terms of energy are developed. The equations are formed as a static case and a dynamic case with unsolved variables defined as generalized coordinates. When these equations are re-arranged, they are equivalent to a modal analysis, which can be solved using Lagrange’s equation method. The generalized coordinates in the static case can be solved manually while in the dynamic case, the ordinary differential equations are solved numerically by developing a computer program using a symbolic software package, MAPLE. The proposed method is comparable with finite element analysis results up to a certain threshold at which development of membrane strain and plasticity modes become dominant. When comparing the results to the reported experimental data, the proposed shape functions for deformations in the lateral directions are modified in order to accommodate the observed behaviour. The results compare favourably with test data and finite element analysis as a control case.Despite inconsistent ductility ratios between the proposed method and the finite element analysis at very high overpressures, the method shows good correlation of results at practical design values. Hence, the proposed method would be a useful tool for preliminary appraisal methods especially for design engineers involved in evaluating the performance of deck plating subjected to a range of hydrocarbon explosion scenarios. 相似文献