对于整体预制钢-混叠合梁桥,通过有限元法进行参数分析,综合考虑弯曲应力与结构刚度,研究截面设计参数(混凝土板厚、翼缘板厚、腹板高等)对组合梁桥结构性能的影响,提出了设计参数的合理取值建议,同时开展了负弯矩区域桥面板抗裂措施研究,可为同类工程提供设计参考.分析结果表明:混凝土板厚度、腹板高度及下翼缘板厚度对整体预制钢-混叠合梁桥的受力影响较为显著,减小腹板厚度与下翼缘板厚度可以降低负弯矩区混凝土顶板拉应力;增加跨中预压载可以显著减小墩顶负弯矩区混凝土顶板的拉应力,提高组合梁的抗裂性能;增大跨中预压载的布载范围也可改善组合梁的负弯矩区受力;墩顶负弯矩的合拢顺序对组合梁的抗裂性能影响很小.
Considering both bending stress and structural stiffness comprehensively,a parametric analysis was conducted using the finite element method to investigate the influence of section design parameters,such as concrete slab thickness,flange plate thickness,and web height,on the structural performance of integral precast steel-concrete composite bridges.Furthermore,reasonable design param-eters were proposed.The study also examines the anti-crack measures of bridge panels in the negative moment zone,offering valuable design insights for similar projects.The results indicate that the thickness of the concrete slab,the height of the web slab,and the thickness of the lower flange plate significantly impact the mechanical performance in integral precast composite bridges.The reduction of both the web slab thickness and lower flange plate thickness can effectively mitigate tensile stress on the concrete roof within negative bending zones.The tensile stress of the concrete roof at the nega-tive bending moment zone can be significantly decreased and the resistance to cracking of composite beams enhanced by increasing the mid-span preload.The mechanical performance in the negative moment zone of the composite beam can be further enhanced by expanding the loading range of the mid-span pre-load.The resistance of composite beams to cracking is largely unaffected by closure sequence in the negative bending moment zones.