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Nonstructural Influence Factors of Dynamic Load Allowance for Concrete Beam Bridges
Chenguang Liu,Zonglin Wang,Qingfei Gao 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5
Studies show that nonstructural parameters, such as pavement conditions or load patterns, have greater influences on the dynamic load allowance (DLA) of bridges than structural parameters. For pavement roughness effects, the values of DLA caused by roughness profiles are calculated by a self-compiled program. The results showed that the values of DLA are discrete even if they are caused by roughness profiles that belong to the same power spectral density (PSD) grade. The PSD grade method for pavement conditions has limitations when it is used in the analysis of DLA. Statistical analysis was also carried out on these DLA results. The statistical analysis indicated that the values of DLA followed a normal distribution when they were excited by roughness profiles that belong to the same grade. For the influence of vehicle string loads on DLA, an improved optimization approach based on a genetic algorithm for the largest DLA is presented. A new method is used to calculate the fitness value in the genetic algorithm (GA) method, which could substantially reduce calculation time. The new approach is able to obtain the most unfavorable arrangement of the vehicle string and estimate the largest DLA caused by it.
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Environmental Effects and Output-Only Model Identification of Continuous Bridge Response
Chuang Chen,Mosbeh R. Kaloop,Qingfei Gao,Zonglin Wang 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.7
Studying the response of bridge due to temperature effects is the main aim of this paper. The Fu-Sui bridge is constructed on a hard environmental effect region in China. To evaluate and assessment the behavior of this bridge, a finite element model and Structural Health Monitoring System (SHM) are used. In addition, the output only model identification is used to assess the thermal response and displacement of bridge. The results of the finite element and monitoring system reveal to that the behavior of the bridge after the first working year is safe, but over a long time period the low temperatures will have an effect on the behavior of the bridge, especially for the upper girder monitoring points. The thermal response and displacement output of the model used conforms with the SHM measurements. Also, the models calculated can be used to detect the bridge behavior in future time monitoring.
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