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Huang C.-P.,Hubei Engineering University | Huang C.-P.,Huazhong University of Science and Technology | Zhang Z.-X.,Huazhong University of Science and Technology | Zheng Z.-J.,Wuhan Bridge Science Research Institute Company Ltd | Tan Y.,Hubei Engineering University
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2015

In order to study force characteristics and failure mechanism of group-nail in steel-concrete composite structure, six specimens for group-nail push-out test and two for pull-out test were designed and produced. Each of the specimens contained sixteen 22 mm-diameter and 200 mm-height nails, and was laid out by four rows and two columns. Based on the push-out test results, the mechanical characteristics, load-slippage curve, and failure mechanism of the group nails were studied and analyzed. In addition, the shear capacity of the group nails was also explored. The average shear capacity of the group nails was less than that of a single 22 mm-diameter and 200 mm-height shear by about 20%. From the pull-out test results, the drawing force-declutch amount curve was obtained and studied, and it is shown that both specimens fail due to the concrete shear failure, and no damages takes place to any of the group nails. Therefore, it is suggested that anchorage length is required for group nails in concrete in order to prevent the group nails from being pulled out of the concrete prior to their shear failure. ©, 2015, Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology. All right reserved. Source


Li X.-X.,Central South University | Li X.-X.,Wuhan Bridge Science Research Institute Company Ltd | Li X.-X.,Important Laboratory for Bridge Safe and Health in Hubei Province | Ren W.-X.,Central South University | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

The fatigue truck model is essentially important for fatigue evaluation. A 3-axle fatigue truck model was developed based on the weigh-in-motion traffic data and with the help of an analytical model of bridge on the montane speedway in southwest China. The truck traffic data show that the fatigue damage is dominated by the 6-axle trucks, so, the simplified 3-axle fatigue truck model was established in the light of the 6-axle truck statistic data. The damage accumulations evaluated by the proposed fatigue truck model can accord well with the actual damage accumulations. Based on the analysis of cumulative probability function of the bending moment and considering the overload, the peak stress magnitude was suggested to take a level of 3 times of the equivalent stress magnitude instead of the 2 times stipulated in AASHTO. The damage accumulations obtained from the simulation of the truck database were compared with those evaluated by BS5400, AASHTO and the proposed fatigue truck model. The proposed fatigue truck and AASHTO fatigue truck with the actual daily flow of trucks were suggested to be used in fatigue evaluation of the bridge on montane speedway in southwest China. BS5400 is improper which relatively overestimates the damage. Source


Li X.,Central South University | Li X.,Wuhan Bridge Science Research Institute Company Ltd | Ren W.,Central South University | Zhong J.,Wuhan Bridge Science Research Institute Company Ltd
Advanced Materials Research | Year: 2011

In order to make good use of large-span suspension bridge health monitoring system, the design for Wuhan Yangluo Yangtze River Bridge health monitoring system (YLBHMS) is outlined, and the implementation of the deformation and vibration on-line monitoring system is introduced. Analysis of the measured temperature, the vertical deformation effect of the main cable and the girder, the longitudinal deformation effect of the main tower and the girder, The fingerprint files are accumulated for the assessment of temperature deformation, the work state of bearing and expansion joints in the follow-up operation; The vibration system recorded the Wenchuan earthquake response, the analysis of the bridge vibration response concluded that the bridge seismic response is in the design scope, the work state of the bridge did not change after the earthquake. © (2011) Trans Tech Publications, Switzerland. Source


Zhong J.,Wuhan Bridge Science Research Institute Company Ltd | Zhong J.,Important Laboratory for Bridge Safe and Health | Huang K.,Guizhou Expressway Development Corporation | Li X.,Wuhan Bridge Science Research Institute Company Ltd | Li X.,Important Laboratory for Bridge Safe and Health
Applied Mechanics and Materials | Year: 2011

The fatigue truck model is an important parameter in a fatigue evaluation, a 3-axle fatigue truck model was developed based on the weigh-in-motion traffic data and an analytical bridge model in the montane highway of Southwest China. The truck traffic data shows that the fatigue damage was dominated by the 6-axles trucks,a 3-axle fatigue truck model was developed based on the 6-axle truck statistic data,the damage accumulations caused by the Proposed fatigue truck righty meet the actual damage accumulations. Based on the cumulative probabilitie of the moment ranges, the peak stress range is suggested to be a stress level at 3 times of the effective stress range because of overload,however,the ratio of the effective stress in AASHTO was 2 times.The damage accumulations obtained from the simulation of the truck database were compared with BS5400,AASHTO and Proposed fatigue truck, Proposed fatigue truck and AASHTO fatigue truck with the actural daily flow of trucks are suggested in the montane speedway of Southwest China ,BS5400 is impropriety which relatively overestimate the damage. © (2011) Trans Tech Publications. Source

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