混凝土桥梁结构工作状况综合评价体系
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摘要
为确保桥梁的工程质量和运营安全,需要准确评定其工作状况,但目前对桥梁结构工作状况综合评价的相关研究还较少。基于15座混凝土桥梁的荷载试验数据,以静载试验效率值(ηq)、挠度校验系数均值(dζ)、应力(应变)校验系数均值(sζ)、相对残余应变均值(Sp′)、冲击系数实测最大值与理论值之比(Rμ)及一阶竖弯自振频率实测值与理论值之比(Rf)等6项指标作为评价指标,运用R主成分分析法,提出了一种新的混凝土桥梁结构工作状况综合评价体系。研究结果表明:实例得出的3个主成分能够全面、可靠地反映混凝土桥梁结构实际工作状况;R主成分分析法可以客观地反映各指标对总体评价结果的影响。该评价体系理论清晰、操作性强,可有效地评价混凝土桥梁结构工作状况。
In order to ensure construction quality and safety operation of bridges,their working condition needs to be accurately assessed,but the study on bridge condition evaluation was insufficient.Based on the loading data of 15 concrete bridges,six evaluation indexes,including the efficiency of static values(ηq),the mean calibration coefficient of deflection(ζd),the mean calibration factor(ζs) of stress(strain),the mean relative residual strain(S′p),the ratio of the measured largest impact factor to the theoretical value(Rμ) and the ratio of the measured first-order vertical bending natural frequencies to the theoretical value(Rf) were evaluated,and the R principal component analysis method was used to build a new comprehensive evaluation system for concrete bridge structures.The results show that the three main components drawn from the examples can comprehensively and reliably reflect actual working condition of concrete bridge structures;the R principal component analysis method can objectively reflect the influence of various indicators on the overall evaluation results.This evaluation system is clear in theory and feasible,and can be used to evaluate the working condition of concrete bridge structures.
In order to ensure construction quality and safety operation of bridges,their working condition needs to be accurately assessed,but the study on bridge condition evaluation was insufficient.Based on the loading data of 15 concrete bridges,six evaluation indexes,including the efficiency of static values(ηq),the mean calibration coefficient of deflection(ζd),the mean calibration factor(ζs) of stress(strain),the mean relative residual strain(S′p),the ratio of the measured largest impact factor to the theoretical value(Rμ) and the ratio of the measured first-order vertical bending natural frequencies to the theoretical value(Rf) were evaluated,and the R principal component analysis method was used to build a new comprehensive evaluation system for concrete bridge structures.The results show that the three main components drawn from the examples can comprehensively and reliably reflect actual working condition of concrete bridge structures;the R principal component analysis method can objectively reflect the influence of various indicators on the overall evaluation results.This evaluation system is clear in theory and feasible,and can be used to evaluate the working condition of concrete bridge structures.
引文
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[2]张建仁,王磊.既有钢筋混凝土桥梁构件承载力估算方法[J].中国公路学报,2006,19(2):49-55.
[3]刘来君,王东阳.大跨径拱桥极限承载力[J].长安大学学报:自然科学版,2004,24(2):48-52.
[4]姚晓飞,徐岳,付迎春,等.体系损伤混凝土T梁桥极限承载力试验[J].广西大学学报:自然科学版,2009,34(2):144-149.
[5]黄侨,任远,林阳子.大跨径桥梁综合评估中的不确定型层次分析法[J].公路交通科技,2008,25(3):79-83.
[6]宗周红,任伟新,郑振飞.既有桥梁承载能力评估方法[J].地震工程与工程振动,2005,25(5):147-152.
[7]杨雅勋,李子春,李子青,等.桥梁状态的区间可拓评估模型[J].交通运输工程学报,2009,9(6):36-41.
[8]马亚丽,王东炜,张爱林.在役桥梁结构健康等级的多级模糊综合评判[J].北京工业大学学报,2005,31(1):36-40.
[9]范剑锋.桥梁健康状态的智能评估方法研究[D].武汉:武汉理工大学土木工程与建筑学院,2006.
[10]辛学忠,苏木标,陈树礼,等.大跨度铁路桥梁健康状态评估的统计对比诊断方法研究[J].铁道学报,2006,28(2):116-121.
[11]李波,韩森,徐鸥明,等.基于主成分分析法的沥青路面使用性能评价[J].长安大学学报:自然科学版,2009,29(3):15-18.
[12]张红,林荫,刘平.基于主成分分析的房地产上市公司盈利能力分析与预测[J].清华大学学报:自然科学版,2010,50(3):470-473.
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