空间网格模型在箱梁桥中的应用
首发时间:2010-09-06
摘要:提出了适合桥梁整个断面应力分析的空间网格计算模型。该模型包含了除泊松效应以外的全部空间效应,可以精确地模拟箱梁各个部分的应力。同时,对箱梁桥箱梁断面中相对较为薄弱的应力位置进行了分析。采用提出的空间网格模型,计算和分析了一座跨径布置为(75+130+75)米的双幅预应力混凝土连续刚构桥梁--重庆新滩綦江大桥箱梁断面的剪应力和主拉应力。一个创新的体内、体外预应力混合配束布置方法被提出和采用。空间网格模型是值得进一步研究的,它能够被运用到更多的桥梁形式中,特别适合新颖的桥梁形式研究。
关键词: 空间网格模型 混合钢束布置方法 大跨径连续刚构桥梁 剪应力 主拉应力
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Application of space frame lattice model in a box-girder bridge
Abstract:In this paper, the space frame lattice model, which is suitable for stress analysis of entire cross-section of bridge, was presented. The model can accurately simulate the stress in every part of box-girder because it takes all the space effects of bridge except Poisson into consideration. The relatively weaker position of stress in box-girder section was analyzed. By using the presented space frame lattice model, the shear stresses and principle tensile stresses of the box girder cross-section in Xintan Bridge, which is a continuous prestressed concrete rigid frame bridge with the (75+130+75) m span, were calculated and analyzed. An innovative layout method of mixed internal and external prestressed tendons was adopted. In addition, the space frame lattice model is worth further investigating. It can be applied to more bridge pattern.
Keywords: space frame lattice model mixed tendon layout method long-span continuous rigid frame bridge shear stress principle tensile stress
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