双工字钢组合梁桥钢梁设计参数敏感性分析与优化

Parametric Study and Optimization on Behavior of Twin-I girder Composite Bridges

对于中小跨径的双主梁式钢板组合梁桥,通过有限元法进行参数分析,综合考虑弯曲应力、局部抗屈曲能力、体系极限承载力等因素,研究局部设计参数(翼缘板宽厚比、腹板高厚比、加劲肋布置等)对双工字钢组合梁桥结构性能的影响,提出设计参数的合理取值建议,并从全桥用钢量最小的角度提出合理钢梁梁高,可为同类工程提供设计参考.

The related parameter study for twin-I girder bridges composite with concrete deck is few in current research. In the paper, FE analyses were developed to study the bending, local buckling and the maximum load capacity of twin-I girder bridges. The design parameters were studied including flange width-thickness ratio, web depth-thickness ratio, stiffener arrangement, and girder depth. Design recommendations were proposed in the paper. A recommendation for girder depth value was given from material saving perspective.