钢顶板-纤维混凝土组合桥面板抗弯性能试验分析  

Experimental Study on Flexural Behavior of Steel Plate and Fiber Reinforced Concrete Composite Slab

作　　者：卢建福 LU Jianfu(Xiamen R&B Baicheng Construction Investment Co.,Ltd.,Xiamen,Fujian 361200,China)

机构地区：[1]厦门路桥百城建设投资有限公司,厦门福建361200

出　　处：《水利与建筑工程学报》2024年第5期153-159,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(52078137)。

摘　　要：为研究纤维混凝土组合桥面板的抗弯性能,了解其受力过程及破坏模式,基于某座采用钢顶板-纤维混凝土组合桥面板的钢箱梁桥,设计并制作局部足尺模型,开展正弯矩和负弯矩抗弯性能试验,分析该组合桥面板的抗弯全过程工作曲线、破坏模式、受力机理与裂缝发展分布情况。研究表明:正弯矩试件受力分为弹性段、弹塑性段和破坏段;负弯矩试件受力分为弹性段、带裂缝工作阶段和钢筋屈服阶段;在正弯矩试件的弹塑性段或负弯矩试件的带裂缝工作阶段,T肋翼缘板底缘和腹板均发生屈服,由于T肋刚度占整体结构刚度较小,组合板结构刚度并未发生显著削弱;正弯矩试件破坏是由于纤维混凝土顶缘压溃所导致的,而负弯矩试件破坏是由于塑性铰发展产生较大的塑性变形引起的。In order to analyze the flexural performance of the fiber reinforced concrete composite deck and understand its stress process and failure mode,based on a steel box girder bridge with a steel roof-fiber reinforced concrete composite deck,a local full-scale model was designed and fabricated to carry out the bending performance test of positive bending moment and negative bending moment,and analyze the working curve,failure mode,stress mechanism and crack development and distribution of the composite bridge deck in the whole bending process.The research shows that the positive bending moment specimen is divided into elastic section,elastic-plastic section and failure section;the negative bending moment specimen is divided into elastic section,working stage with cracks and steel yield stage.In the cracked working stage of the elastic-plastic section or the negative bending moment specimen,both the bottom edge and the web of the T-rib flange plate yield.Since the stiffness of the T-rib is small in the overall structural stiffness,the structural stiffness of the composite plate is not significantly weakened.The failure of the positive moment specimen was caused by the crushing of the top edge of the fiber reinforced concrete,while the failure of the negative moment specimen was caused by the yielding of the steel bars in the fiber reinforced concrete slab.

关 键 词：组合桥面板 纤维混凝土 正弯矩 负弯矩 足尺模型 抗弯试验 

分 类 号：U443.3[建筑科学—桥梁与隧道工程]