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- 저자 : Yiyan Lu (검색결과 2 건)
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Temperature monitoring and analysis of a long-span cable-stayed bridge during construction period
Mei, Xiudao,Lu, Yiyan,Shi, Jing Techno-Press 2021 Structural monitoring and maintenance Vol.8 No.2
The temperature induced response of long-span cable-stayed bridge in cantilever state is significant, which is of great interest to study the temperature characteristics during construction period. A method of analyzing the eigenvalue and its extremum of daily temperature based on cubic spline function (CSF) is proposed. By setting the fixed time interval reasonably, introducing variable time interval and extracting nodes at the MinMax of daily temperature, the obtained CSF can approach the measured temperature curve with high accuracy. Based on CSF, the temperature characteristics at three levels of measuring point, section and component are analyzed in turn. The temperature monitoring data of a cable-stayed bridge with main span of 938 m and side span of steel-concrete composited box girder (CBG) during construction are analyzed. The results show that the temperature variation of steel box girder is remarkable; the steel beam of CBG is similar to steel box girder before composited, and it turns stable after composited; the influence of PE color on cable temperature is notable than that of the cable specification; as blue PE cable, the temperature difference of cable vs pylon and cable vs CBG exceed 17℃ and 13℃.
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Hongjun Liang,Yanju Jiang,Yiyan Lu,Jiyue Hu 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.4
Twenty-two corrosion-damaged columns were simulated through accelerated steel corrosion tests. Eight specimens were directly tested to failure under axial load, and the remaining specimens were tested after concrete-filled steel tube (CFST) strengthening. This study aimed to investigate the damage of RC columns after corrosion and their restoration and enhancement after strengthening. The research parameters included different corrosion degrees of RC columns, diameter-to-thickness ratio of steel tube and the strengthening concrete strength. Experimental results showed that CFST strengthening method could change the failure mode of corrosion-damaged RC columns from brittleness to ductility. In addition to the bearing capacity provided by the strengthening materials, it can also provide an extra 26.7% amplification because of the effective confinement provided by steel tubes. The influence of corrosion on reinforcement and concrete was quantitatively analysed and considered in the design formula. The proposed formula accurately predicted the bearing capacity of the strengthened columns with a maximum error of only 7.68%.
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