内衬混凝土波折钢腹板梁抗弯性能试验研究

Experimental Study on Bending Behavior of Concrete encased Composite Girder with Corrugated Steel Web

摘要:

提出了波折腹板内衬混凝土改善连续梁负弯矩区的结构力学性能.通过两点对称加载试验研究了波折腹板内衬混凝土组合梁的弯曲性能.试验表明：与钢波折腹板梁相比，内衬混凝土可限制波折腹板梁受压翼缘的屈曲，提高组合梁的弯曲强度与延性.依据试验弯曲破坏模式与应力分布，提出了弯曲强度的计算方法，理论与试验结果相比吻合较好.试验结果与理论计算方法可为波折腹板内衬混凝土结构的设计提供参考.

关键词:组合梁; 波折钢腹板; 内衬混凝土; 抗弯性能; 模型试验

Abstract:

Partially concrete encased composite girder with corrugated web was proposed to improve the structural mechanics performance of continuous girder under hogging moment. The bending behavior of concrete encased composite girders with corrugated web under two points symmetric loading was experimentally investigated. Experimental results show that the partially encased girder has superior bending strength and ductility compared to steel I girder, as local buckling of compressive flange is restricted by concrete encasement. In addition, prediction methods of bending strength under ultimate state were proposed based on the experimental failure mode and strain distribution. And the calculated bending strengths for steel and composite girders at ultimate state agreed well with the experimental results. The test findings and analytical methods were considered to be of special significance to the design of such partially encased composite girders with corrugated web.

Key words:composite girder; steel corrugated web; concrete encasement; bending behavior; model test