【摘要】 针对虎门大桥正交异性钢桥面板,探讨不同边界条件和加载方式下,有限元法和P E法的差异。采用全梁段板壳单元模型,进行8种工况的分析计算。结果表明:支承长度的变化,将导致桥面体系和顶板体系的计算结果有明显差异,并且支承长度和荷载的变化对跨中正应力的影响小于支点位置,因此全梁段模型的计算支承长度需与全桥体系计算中采用的梁单元长度匹配。将跨中和横梁位置桥面板和U形加劲肋的正应力计算结果与P E法进行比较后,发现前一方法更能体现这种结构的整体受力和变形性能,更全面反映不同部位在不同荷载和不同边界条件下的性能差异。通过与实测值的比较,说明本文建立的全梁段板壳单元模型可以反映正交异性桥面板的桥面体系和顶板体系的综合受力性能。更多还原

【Abstract】 The difference between FEA method and PelikanEsslinger method under various loading and boundary conditions of the orthotropic steel deck of the Humen Bridge are discussed. The author uses the entire girder segment model to calculate normal stress and deflection under eight loading cases. It is founded that there is obvious difference in the calculation results of deck system and top plate system with the change of supported length. Meanwhile, the effect of the change of supporting length and load on normal stresses at midspan is not as obvious as those at cross beam. Therefore, the supporting length of the entire girder segment model should accord with that of beam element in entire bridge analysis. The results of normal stresses in decks and trapezoidal longitudinal ribs at midspan and cross beam are also compared with those of PelikanEsslinger method. These have proved that the former method can embody more perfectly the stressing and deformation state and reflect different behavior of different parts in various loading and boundary conditions. Furthermore, after comparing the results of field test to those obtained from calculating, it can be seen that the entire girder segment model presented in this paper can reflect the deck system and the stressed state of top plate system.更多还原