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以某城市立交桥匝道的4跨预应力混凝土连续箱梁桥为原型,运用有限元软件,用实体力筋法,建立桥跨结构的三维实体单元分析模型,采用结构空间分析方法,详细研究了当独柱墩身高度不同时,对独柱支撑小半径弯梁桥的上、下部结构的受力影响,并提出了一些可供参考的建议。结果表明:墩身高度对桥梁上下部结构的内力影响很大,墩身较矮情况下,不宜采用墩梁固结的支撑方式;墩身较高情况下,中墩、次边墩可采用墩梁固结的支撑方式,边墩要视具体情况分析采用合理的支撑方式。桥跨结构采用空间实体单元而不采用传统的梁单元,可以充分地计入翘曲、畸变、剪力滞及泊松比等的影响,空间计算分析结果更加精确。
Taking a 4-span prestressed concrete continuous box girder bridge of a city overpass as a prototype, a finite element software is used to build a three-dimensional solid element analysis model of the bridge span structure by using the method of solid stiffeners. The structural space analysis method is used to study in detail when When the height of the single column pier is different, the influence of the force on the upper and lower structures of the small radius curved beam bridge supporting the single column is put forward and some suggestions are given for reference. The results show that the pier height has a great influence on the internal forces of the upper and lower parts of the bridge. When the pier body is short, it is not suitable to adopt the pier-girder consolidation support method. In the case of pier body, the pier can be used as the pier Beam consolidation support method, the side pier should be based on the specific circumstances of the analysis of the use of reasonable support. The bridge span structure adopts the spatial entity unit instead of the traditional beam element, so the influence of warpage, distortion, shear lag, Poisson’s ratio and so on can be fully taken into account. The result of space calculation and analysis is more accurate.