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为研究新、旧结构的混凝土收缩、徐变对混凝土桥梁横向拼接的影响,考虑上、下部结构共同工作,对不同加宽方案的预应力混凝土箱梁桥因收缩徐变引起的结构横向效应进行了分析。研究结果表明:是否考虑结构上、下部共同工作对拓宽桥梁结构的横向受力状态影响显著,且拼接后既有主梁内的横向和轴向效应远大于竖向效应;拼接后旧桥上、下部结构的承载力发生改变,实桥拼接后旧桥受力最不利墩柱的抗压承载力仅为拼接前的51%,箱梁跨中截面的抗弯承载力为拼接前的98%~108%,支座截面的抗弯承载力为拼接前的87%~96%;新旧结构上、下部结构共同工作效应及旧桥上、下部结构承载力的改变在这类桥梁加宽改造设计时应当考虑。
In order to study the influence of concrete shrinkage and creep of new and old structures on the transverse splicing of concrete bridges, the horizontal and lateral structures of prestressed concrete box-girder bridges with different broadening schemes due to shrinkage and creep are considered Analysis. The results show that whether the horizontal and axial effects of the existing main girders after splicing are much greater than that of the vertical effect are considered whether considering whether the joint work of the upper and lower structures has a significant effect on the lateral stress state of the bridge structure. The bearing capacity of the substructure changes. The compressive bearing capacity of the most unfavorable piers after the actual bridge splicing is only 51% before splicing. The flexural capacity of the mid-span of the box girder is 98% 108%. The flexural capacity of the bearing section is 87% ~ 96% before splicing. The common effect of the upper and lower structures of old and new structures and the change of the bearing capacity of the upper and lower structures of the old bridge, Should consider.