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Design of aerodynamic model for unique arch bridge

5th International Conference on Mechanical and Electrical technology, ICMET 2013

作者： Cheng, Shou Shan Huang, Hai Xin Zhang, Ying Qie, Yan Hui Key Laboratory of Bridge Detection and Reinforcement Technology Ministry of Communications Beijing 100088 China School of Civil Engineering Hebei University of Technology Tianjin 300401 China Library Hebei University of Technology Tianjin 300401 China

ISBN: (纸本)9783037858349

The model test is an effective means to verify the mechanical performance of the bridge structure and to ensure the structural safety. The accuracy of design and manufacture is the key of model test. For a arch ridge with curved beam and skewed arch, the model test based on the similarity theory is analysized in detail including selecting materials, designing the size of section and calculating the geometrical parameters and so on, and the simulation reults between model and prototype are evaluated. Meanwhile some key technologies and valuable matters for design of aerodynamic model are presented, which provides an important reference value for model design of bridge structures. © (2013) Trans Tech Publications, Switzerland.

关键词： Arches

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Improved Seismic Checking for Pier Based on Seismic Energy Response Method

Improved Seismic Checking for Pier Based on Seismic Energy R...

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2013 3rd International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2013)

作者： Yu Li Yanyang Che Sen Wang Key Laboratory of Ministry of Communications for Bridge Detection & Reinforcement Technology School of Highway Chang'an University

Based on prophase research work,seismic checking for pier based on energy method is *** seismic input energy demand of pier is determined by using the seismic input energy response spectra and hysteretic energy dissipation spectra of ***,the Pushover Method is used to determine the hysteretic deformation capacity of ***,based on the equilibrium principal between hysteretic deformation capacity and seismic input energy demand of pier,seismic checking for pier is carried ***,this improved seismic checking for pier based on energy method is applied in the design examples of *** with the calculation of nonlinear time history analyses,it is known that improved seismic checking for pier based on energy method can evaluate the seismic performance of pier ***,these valuable results can provide the meaningful reference for the seismic design of bridge engineering.

关键词： bridge engineering Seismic checking Earthquake energy Nonlinear Energy response spectrum

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Analysis on Aerostatic Response for Hongkong-Zhuhai-Macao Great bridge in Construction Stage

Analysis on Aerostatic Response for Hongkong-Zhuhai-Macao Gr...

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2013 3rd International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2013)

作者： Yu Li Sen Wang Yanyang Che Key Laboratory of Ministry of Communications for Bridge Detection & Reinforcement Technology School of Highway Chang'an University

Based on the wind tunnel experiment for aerostatic force of section model of Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in construction stage,one calculation program considering the geometric nonlinearity and aerostatic nonlinearity is prepared by using ANSYS parametric design language in order to calculate the nonlinear aerostatic response for long-span cable-stay ***,the FEA model of Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in construction stage is established to analyze the threedimensional nonlinear aerostatic *** the aerostatic response with different position of bridge is also *** research result indicates that the aerostatic instability can not occur in Jianghai direct ship channel bridge of Hongkong-zhuhai-macau great bridge in its construction ***,the max torsion deformation,transverse and vertical displacement of construction stage occur in the terminal edge of both left and right span and decreases gradually near to main tower.

关键词： Cable-stay bridge Aerostatic response Finite element Nonlinear analysis Aerostatic stability

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Impact Analysis on Construction Control of Pre-camber for Long-span Continuous Rigid Frame bridge in Winter Intermission

Impact Analysis on Construction Control of Pre-camber for Lo...

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2013 2nd International Conference on Sustainable Construction Materials and Computer Engineering(ICSCMCE 2013)

作者： Yaxun Yang Yuan Hong Chao Qiao Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang'an University ZheJiang Provincial Institute of Communications Planning Design & Research

Cantilever casting construction has been commonly used in construction of continuous rigid frame bridge and the implementation of construction control plays an important role in ensuring the line-type of built bridges and the forced state in construction stage is within the design requirements range. It tends to construct across the winter possibly. Based on an analysis of a typical continuous rigid frame bridge construction stage, this paper takes the impact of winter intermission on pre-camber in construction stage into consideration and the research has guiding significance for the construction of the similar bridge to a certain degree.

关键词： Winter intermission Continuous rigid frame Construction control Pre-camber

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Image-based method for concrete bridge crack detection

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Journal of Information and Computational Science 2013年第8期10卷 2229-2236页

作者： Li, Gang He, Shuanhai Ju, Yongfeng School of Electronic and Control Engineering Chang'an University Xi'an 710064 China Key Lab. for Old Bridge Detection and Reinforcement Technology of Min. of Transportation Chang'an University Xi'an 710064 China

This paper presents a modified image processing method for detecting cracks in surface images of concrete bridges. Clip, filling and rotation transformation are applied on concrete images for precise extracting cracks. Modified C-V model, adaptive threshold, morphology, C-V model and Canny are compared on segmenting crack images which are gathered in different illumination. Analysis results indicated that the misclassification rate of the modified C-V model is 3.56% and the operation time is 96 ms. Therefore, the proposed method can be used for the accurate detection of cracks in surface images recorded under various conditions. Moreover, the estimated crack widths are in good agreement with those measured manually. Copyright © 2013 Binary Information Press.

关键词： Image segmentation

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Research on the influence of the aerodynamic measure on the flutter derivative of the steel truss suspension bridge

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2012 2nd International Conference on Materials Science and Information technology, MSIT 2012

作者： Hua, Bai Wei, Guo Wei, Li Yu, Li Key Laboratory of Ministry of Communications for Bridge Detection and Reinforcement Technology Chang'an University Xi'an 710064 China

ISBN: (纸本)9783037854389

Flutter derivative is a significant index of the structure flutter stability. Identifying flutter derivative precisely contributes to the bridge flutter stability analyzing. In this paper, we take a research on the Liujiaxia bridge in Gansu Province, China. Different flutter derivatives, which were got via segment model vibration tests with different aerodynamic measures, were classified, and made comparison in order to get the law of how different aerodynamic measures effect on the flutter derivative. The results show that, setting central stabilized plate, Build-in deflector, flange plate all affect flutter derivative significantly, which leads to changes in the flutter critical wind velocity of the structure. Setting central stabilized plate above the deck contributes to identify the flutter derivative of the 0° and positive attack angle, while setting central stabilized plate will contribute to flutter derivative identification at negative angles. It will make it difficult to identify the flutter derivative at 0° and -3° if the built-in deflector was set. Wind plate contributes to the identification of the flutter derivative at +3°, however, it will make it harder to identify the flutter derivative at 0° and -3°. © (2012) Trans Tech Publications, Switzerland.

关键词： Suspension bridges

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Wind tunnel test and the analysis of buffeting performance of free-standing tower of cable-stayed bridge under yaw wind

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2012 2nd International Conference on Materials Science and Information technology, MSIT 2012

作者： Zhao, Guohui Li, Yu Bai, Hua Key Laboratory of Ministry of Communications for Bridge Detection and Reinforcement Technology Chang'an University Xi'an 710064 China

ISBN: (纸本)9783037854389

The buffeting performance of free-standing tower of JiangHai Navigation Channel bridge, a cable-stayed bridge, under yaw wind is investigated by means of wind tunnel test of aeroelastic model. It is found that the variation of buffeting response of free-standing tower with wind yaw angle is not monotonous. The lateral buffeting response on the top of the free-standing tower reach their minimal values and maximal values at around 150°and 180°of wind yaw angle respectively and the longitudinal buffeting response attain their maximal values at around 90°of wind yaw angle. Also, at the 2/3 height of the tower the lateral buffeting response and torsional buffeting response get their minimal values at around 150°of wind yaw angle, and at around 180°achieve the maximal values. It is also seen that, the buffeting response changes with the wind speed at a conic curve approximately. © (2012) Trans Tech Publications, Switzerland.

关键词： Towers

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Research on the impact of damping to the flutter derivatives of steel truss suspension bridge

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2012 2nd International Conference on Materials Science and Information technology, MSIT 2012

作者： Hua, Bai Cheng, Fang Yu, Li Key Laboratory of Ministry of Communications for Bridge Detection and Reinforcement Technology Chang'an University Xi'an 710064 Xi'an China

ISBN: (纸本)9783037854389

The flutter derivative is the important basic tache of bridge flutter stability analysis. Taking the Liujiaxia bridge in Gansu province as the research object, this dissertation studies the impaction of damping ratio on the flutter derivatives and the critical wind speed through different series of section model vibration test. The results showed that the change of vertical bending and torsional damping ratio have no obvious regular influence on the eight flutter derivatives. But the changing of vertical bending and torsional damping ratio have the greatly impact on the critical wind speed at 0° and -3° angle of attack. When it is at 0° angle of attack, the vertical bending damping ratio ζh is increased by 23%,the torsional damping ratio is increased by 0.63%, the flutter critical wind speed is increased by 4%;when the ζh is increased by 1.04%, the ζα is increased by 0.87%, the flutter critical wind speed is increased by 7%. When it is at -3° angle of attack, the vertical bending damping ratio remained around 0.8%, the torsional damping ratio is increased from 0.65% to 1.05%, the flutter critical wind speed is increased by 14%;when the ζα is increased from 0.65% to 2.05%, the flutter critical wind speed is increased by 24 %.When it is at +3 °angle of attack, the vertical bending and torsion damping ratio have little effect on the flutter critical wind speed. © (2012) Trans Tech Publications, Switzerland.

关键词： Angle of attack

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The numerical simulation of the impact on the hangzhou bay bridge offshore platform and the sightseeing tower

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2012 2nd International Conference on Materials Science and Information technology, MSIT 2012

作者： Hua, Bai Fangliang, Wang Yu, Li Key Laboratory of Ministry of Communications for Bridge Detection and Reinforcement Technology Chang'an University Xi'an 710064 Xi'an China

ISBN: (纸本)9783037854389

In this paper, the distribution of surface wind pressure and wind speed of Hangzhou bay bridge, offshore platform and sightseeing tower is numerically simulated based on Fluent. Two turbulence models, standard k Ε model and Realizable k Ε model, are used. The influence of the wind pressure distribution of the offshore platform and sightseeing tower by Hangzhou bay bridge is also analyzed. And the detailed comparison between numerical simulation and wind tunnel test is given. Results show that the impact of Hangzhou bay bridge on platform and sightseeing tower occurs mainly with the angle of the wind less than 45°. When the angle of the wind is more than 45°, the impact is little. The upper of the sightseeing tower does not almost suffer the effect of other buildings. The surface pressure of the platform changes from 5% to 15% between under bridge and under non-bridge condition. The surface pressure of sightseeing tower changes from 0.05% to 3%. The influence on the platform by the bridge is significant but not significant on the sightseeing tower. The simulation results of the tower and mast structure given by both standard k Ε model and Realizable k Ε model find that the windward side is ideal;the crosswind side is the best;the leeward side is less than ideal. By contrast, the Realizable k Ε model is a closer correlation with wind tunnel test than standard k Ε model. © (2012) Trans Tech Publications, Switzerland.

关键词： Numerical models

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Test study on aerodynamic performance of three-dimensional stayed cables in two-dimensional flow field

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2012 2nd International Conference on Materials Science and Information technology, MSIT 2012

作者： Xue, Xiao-feng Hua, Bai Yu, Li Wei, Li Sai, Gong Key Laboratory of Ministry of Communications for Bridge Detection Reinforcement Technology Chang'an University Xi'an 710064 China Department of Municipal Engineering Guangdong power vocational and technical college Guangzhou Guangdong 510635 China

ISBN: (纸本)9783037854389

Cables, distributed with diversity spatially angle, are rich in wind direction. Circular cross sectional shape is sensitive to the Reynolds number. This paper studed the aerodynamic performance of three-dimentional stayed cable under two-dimensional flow field in Chang'an University wind tunnel by Pitot tube, electronic pressure scanning valve, data conversion and collection systems. The following conclusions are obtained: (1)The stagnation point and the upper and lower airflow separation point clockwise goes on with the wind angle increases. Absolute value of pressure coefficient at stagnation point and separation point are biggest at 0°wind angle.(2)The absolute value of pressure coefficient at upper and lower separation point increase with the increase of wind speed.(3) Pressure stagnation point,and upper and lower airflow separation point don't changed with the parameters of helix,while pressures near helix changed irregularlly. Drag coefficient decrease with the increase of helix distance and the deduce of helix height. Meaningful references are provided for the further refinement research on aerodynamic performance of cable-stayed with suppressing vibration measures. © (2012) Trans Tech Publications, Switzerland.

关键词： Wind tunnels

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