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- 저자 : Danhui Zhao (검색결과 3 건)
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Research on Vehicle-Induced Vibration of Pedestrian Bridge and Its Application in Comfort Evaluation
Zhao Rui,Wu Yuhang,Dan Danhui 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.1
The vibration responses of pedestrian bridges are mainly caused by two transmission routes of ground and airfl ow under vehicle excitation. In order to clarify the action mechanism and infl uence degree of ground excitation and airfl ow excitation on pedestrian bridges, based on stochastic theory and fl ow fi eld analysis method, the calculation models of vehicle-induced ground excitation and airfl ow excitation considering the infl uence of vehicle length, vehicle width and bridge deck width are established respectively. Considering the eff ects of vehicle speed, road grade, and vehicle mass, the vibration response of a continuous steel box girder pedestrian bridge under the two transmission routes was analyzed in this study. The laws of vibration acceleration and stress were summarized, and the accuracy of the fi nite element model and the laws were verifi ed by fi eld-measured data. Results show that road grade and vehicle mass are the main factors causing the vibrations of pedestrian bridges under vehicle excitation. Vehicle speed has a great infl uence on structural vibration under airfl ow excitation. The vibration response is the largest at mid-span along the pedestrian bridge-length direction. When the vehicle speed is less than about 60 km/h, the infl uence of the airfl ow excitation on the structure may not be considered. On this basis, the comfort level of the pedestrian bridge was evaluated using the British Standards Institution. The given evaluation criteria of the pedestrian bridge complement the design regulations of the pedestrian bridge.
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Yiming Zhao,Danhui Dan,Xingfei Yan,Kailong Zhang 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.1
The hinge joint is the key to the overall cooperative working performance of the assembled beam bridge, and it is also the weakest part during the service period. This paper proposes a method for monitoring and evaluating the lateral cooperative working performance of fabricated beam bridges based on dynamic strain correlation coefficient indicator. This method is suitable for monitoring and evaluation of hinge joints status between prefabricated girders and overall cooperative working performance of bridge, without interruption of traffic and easy implementation. The remote cloud monitoring and diagnosis system was designed and implemented on a real assembled beam bridge. The algorithms of data preprocessing, online indicator extraction and status diagnosis were given, and the corresponding software platform and scientific computing environment for cloud operation were developed. Through the analysis of real bridge monitoring data, the effectiveness and accuracy of the method are proved and it can be used in the health monitoring system of such bridges.
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Yong Zhang,Zhuang Zhou,Cheng’ai Wu,Danhui Zhao,Chao Wang,Xiaoguang Cheng,Wei Cai,Ling Wang,Yangyang Duanmu,Chenxin Zhang,Wei Tian 대한영상의학회 2016 Korean Journal of Radiology Vol.17 No.5
Objective: To investigate the bone mineral density (BMD) of cervical vertebrae in a population-stratified manner and correlate with that of the lumbar vertebrae. Materials and Methods: Five hundred and ninety-eight healthy volunteers (254 males, 344 females), ranging from 20 to 64 years of age, were recruited for volumetric BMD (vBMD) measurements by quantitative computed tomography. Basic information (age, height, weight, waistline, and hipline), and vBMD of the cervical and lumbar vertebrae (C2–7 and L2–4) were recorded. Comparisons among sex, age groups and different levels of vertebrae were analyzed using analysis of variance. Linear regression was performed for relevance of different vertebral levels. Results: The vBMD of cervical and lumbar vertebrae was higher in females than males in each age group. The vBMD of the cervical and lumbar vertebrae in males and the vBMD of lumbar vertebrae in females decreased with aging. In each age group, the vBMD of the cervical vertebrae was higher than that of the lumbar vertebrae with gradual decreases from C2 to C7 except for C3; moreover, the vBMD of C6 and C7 was significantly different from that of C2–5. Correlations of vBMD among different cervical vertebrae (females: r = 0.62–0.94; males: r = 0.63–0.94) and lumbar vertebrae (males: r = 0.93–0.98; females: r = 0.82–0.97) were statistically significant at each age group. Conclusion: The present study provided normative data of cervical vertebrae in an age- and sex-stratified manner. Sex differences in vBMD prominently vary with age, which can be helpful to design a more comprehensive pre-operative surgical plan.
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