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在桥梁工程中,较大的基础沉降不仅改变桥面线形,更严重的是改变结构受力状况,不同的沉降对于结构内力、位移的影响亦不相同。营口民生路大桥所处场地土为压缩性较大的土质,承载力较低,容易引起过大的沉降。文章以该桥为例对独塔斜拉桥在不同基础沉降模式下的内力变化展开研究,通过建立有限元计算模型,定量分析加以简化的实际结构,比较了该桥在四种不同模式基础沉降作用下结构内力的变化,得到的结果可以为同类桥梁的设计和监测提供参考。
In bridge engineering, larger foundation subsidence not only changes the linear shape of bridge deck, but also changes the stress state of structure more seriously. The influence of different subsidence on internal force and displacement of structure is also different. Yingkou Minsheng Road Bridge where the soil is more compressive soil, bearing capacity is low, easily lead to excessive settlement. Taking the bridge as an example, this paper studies the internal force variation of single tower cable-stayed bridge under different subsidence modes. Through the establishment of finite element model, the simplified structure is quantitatively analyzed. The results show that the bridge under four different modes of foundation subsidence Under the action of the structural internal forces, the results obtained can provide references for the design and monitoring of similar bridges.