基于遗传算法的FRP筋混凝土梁抗剪承载力优化分析  

Optimization Analysis of Shear Capacity of FRP Reinforced Concrete Beams using Genetic Algorithm

作　　者：张智梅[1] 陈刚 王卓 ZHANG Zhimei;CHEN Gang;WANG Zhuo(Department of Civil Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《结构工程师》2019年第6期33-42,共10页Structural Engineers

摘　　要：《纤维增强复合材料建设工程应用技术规范》(GB 50608—2010)建议的FRP筋混凝土梁受剪承载力计算公式分析收集到的209根FRP筋试验梁(包括无箍筋梁和有箍筋梁)的抗剪承载力,对比各梁抗剪承载力的理论值与试验值表明,规范推荐的方法过于保守。为此,采用灰度关联法分析了影响FRP筋梁受剪承载力的主要因素,结果表明梁横截面宽度对FRP筋混凝土梁受剪承载力影响最大,其次分别为剪跨比、混凝土轴心抗拉强度等。据此,分析了规范公式未考虑剪跨比的影响,在此基础上,采用遗传算法对规范公式进行了相应修正,并利用上述209根梁的试验数据验证了修正后的抗剪承载力计算公式的合理性。计算结果表明,对于无箍筋梁,修正前后的试验值与理论值之比的均值由4.42变为1.52,对于有箍筋梁则由2.18变为1.52。209 test beams reinforced with fiber-reinforced polymer(FRP)bars with and without FRP stirrups were analyzed using shear bearing capacity's formulas recommended by the Technical Code for infrastructure application of FRP composites(GB 50608-2010).By comparing the measured shear strength of FRP-reinforced concrete beams with its calculated values,the result shows that the method adopted by the code is highly conservative.Therefore,main factors that affected the shear capacity of FRP reinforced concrete members were analyzed by adopting the grey relational analysis.The results show that the most important factor is the width of the cross section,followed by the shear span ratio,design value of concrete axial tensile strength and so on.The formulas were revised on the basis of previous analyses and then verified their rationality using aforementioned 209 test data of beams.Compared with the unrevised provision,the mean of ratio of the test to the predicted shear strength of the beams without shear reinforcement,is reduced are from 4.42 to 1.52,whereas that of beams with stirrups is reduced from 2.18 to 1.52.

关 键 词：FRP筋 混凝土梁 抗剪承载力 遗传算法 剪跨比 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TU377.9[自动化与计算机技术—控制科学与工程]