CAJ | 학술논문

为了得到桥梁全寿命评估的温度数据，提出了一种基于实测数据的钢箱梁桥随机温度场模拟方法。首先，采用最小二乘估计和假设检验，对润扬大桥悬索桥扁平钢箱梁为期5年的实测温度和温差进行了统计分析；然后，提出了一种复杂统计模式下样本序列模拟的数值逆变换抽样方法，并建立了扁平钢箱梁的全寿命评估随机温度场。研究结果表明：扁平钢箱梁实测温度服从2个正态分布的加权和，实测温差则服从1个Weibull分布和1个正态分布的加权和；利用数值逆变换抽样方法模拟得到的样本的概率密度函数与目标概率密度函数吻合良好；模拟温度场能准确描述扁平钢箱梁的温度特性。因此，该数值逆变换抽样方法能够准确模拟大跨悬索桥扁平钢箱梁全寿命期的随机温度场。
위료득도교량전수명평고적온도수거，제출료일충기우실측수거적강상량교수궤온도장모의방법。수선，채용최소이승고계화가설검험，대윤양대교현색교편평강상량위기5년적실측온도화온차진행료통계분석；연후，제출료일충복잡통계모식하양본서렬모의적수치역변환추양방법，병건립료편평강상량적전수명평고수궤온도장。연구결과표명：편평강상량실측온도복종2개정태분포적가권화，실측온차칙복종1개Weibull분포화1개정태분포적가권화；이용수치역변환추양방법모의득도적양본적개솔밀도함수여목표개솔밀도함수문합량호；모의온도장능준학묘술편평강상량적온도특성。인차，해수치역변환추양방법능구준학모의대과현색교편평강상량전수명기적수궤온도장。
A stochastic temperature field simulation method for steel box-girder bridge based on moni-toring data is developed to provide sufficient temperature data for life-cycle evaluation.First, the least square estimation and hypothesis testing are employed to analyze the statistical data of monitoring tem-perature and thermal diffeernce of the flat steel-box girder of the Runyan g suspension bridge ( RSB) in five years.Then, a numerical inverse transform sampling method is proposed to simulate sam ple series with the complex statistical model, and the life-cycle stochastci temperature field of the flat steel-box gir der is simulated.The results show that the monitoring temperature of the falt steel-box girder can be described by the we ighted sum of two normal distributions, while the thermal diference among test points can be presented by the weighted su m of the Weibull distribution and the normal distribution. Teh probability distribution function of the sample simulate d by the numercial i nevr set ransform sam-pling method agrese well with the target probability distribution function.T he simulated temperature field can accurately describe the etmperature field's characteristics of the flat steel box-g irder.There-fore, the numerical inverse rt ansform samlping method can accurately simulate the life-cycle stochas tic temperature field of the flat steel box girder of the long-span suspension bridge.