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现行高速铁路桥梁的结构形式主要还是以简支梁和连续梁为主,简支梁是静定结构,基础不均匀沉降对其不产生影响,但连续梁是超静定结构,基础不均匀沉降对超静定结构的内力产生很大的影响,因此,在工程设计中必须考虑基础不均匀沉降对连续梁内力的影响。本文以某城际铁路4*30m预应力混凝土连续梁设计为例,分析基础不均匀沉降的影响。
The existing high-speed railway bridges are mainly constructed of simply supported beams and continuous beams. The simply supported beams are statically indeterminate, and the uneven foundation settlement does not affect them. However, the continuous beams are statically indeterminate It has a great influence on the internal force of the statically indeterminate structure. Therefore, the influence of the uneven foundation settlement on the internal force of the continuous beam must be considered in engineering design. Taking a 4 * 30m prestressed concrete continuous beam design of an intercity railway as an example, this paper analyzes the effect of uneven foundation settlement.