中文摘要：

提出考虑裂缝宽度的GFRP筋混凝土梁极限承载力的设计方法。根据正常使用极限状态规定的梁裂缝宽度限值,设定受压区边缘混凝土的压应变;求出等效矩形应力图系数,分析截面应力应变关系;根据平衡条件,计算裂缝宽度限值确定的受拉筋材配筋率,并与平衡配筋率比较,取较大值作为GFRP筋混凝土梁中受拉筋材的配筋率。将计算得到的配筋率与实际试验构件采用的配筋率进行比较,其误差可以满足工程要求。考虑裂缝宽度的设计方法更能有效体现GFRP筋混凝土梁的实际工作状态,并具有安全可靠的承载力储备。

英文摘要：

A new design was proposed herein that the ultimate load of the GFRP reinforced concrete beam depends on the crack width and deflection. On the basis of the beam crack width limiting value,the concrete compressive strain at the edge of the pressure zone was specified. The coefficient of equivalent rectangular stress block was obtained and the stress-strain relationship of the section was analyzed. According to equilibrium conditions,the reinforcement ratio of the GFRP bars in tension was calculated,respectively determined by crack width limiting value and deflection limiting value,and by comparing with balanced reinforcement ratio,the maximum value was adopted to be reinforcement ratio of the tensile GFRP bars in the concrete beam. Finally,based on the fixed sectional size and reinforcement area,the ultimate limit state was checked and the safety factor of the beam was determined. Based on this method,numerical calculation was conducted to the actual beam,and this result indicates that the design effectively reflects the real working condition of GFRP reinforced concrete beam with secure and reliable bearing capacity reserve.