GFRP筋混凝土桥面板承载性能的试验研究

Experimental study of load-carrying capacities in GFRP reinforced bridge deck slabs

为了研究采用玻璃纤维筋(GFRP)作为配筋材料的混凝土桥梁面板工作性能,结合板内的压缩薄膜效应对该类结构进行了静力加载试验研究。在试验设计中采用了一套1∶3比例缩小的试验模型,桥梁面板分别支撑于混凝土梁和钢梁上。通过改变结构模型参数,包括支撑梁尺寸、配筋率和配筋材料等,分析其对GFRP筋混凝土桥梁面板承载性能的影响。将试验结果与现行FRP筋混凝土结构设计规范(ACI440.1R06)对比后发现,现行设计规范低估了该结构的真实承载能力。为了准确计算出该非金属筋材混凝土结构的实际承载力,建立了非线性有限元模型,该数值模型的计算结果与试验结果有着良好吻合。

In the investigation of behaviours of concrete bridge deck slabs reinforced with GFRP bars, an experimental study of this structural type under static loads was carried out with consideration of compressive membrane action （CMA）. In the experimental test, a series of one-third scaled models were conducted. The concrete slabs were supported by concrete beams and steel beams respectively. Some structural parameters were varied to investigate the influences from them on ultimate strengths and CMA. Those variables included supporting beams sizes, reinforcement percentages and reinforcing materials. With the comparisons of experimental results and predictions from design codes of FRP reinforced concrete structures （ ACI 440. 1R06 ）, it was found that current design standard underestimated the loading carrying capacities. The nonlinear finite element model was established to obtain the accurate predictions of ultimate strengths in this non-metallic reinforced concrete structures. The ultimate strengths provided by numerical analysis showed a good agreement with those from experimental tests.