Chongqing Highway Engineering Quality Inspection Center

Chongqing, China

Chongqing Highway Engineering Quality Inspection Center

Chongqing, China

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Zhang Y.-N.,Shenyang Jianzhu University | Liu C.-L.,Shenyang Jianzhu University | Li Y.-B.,Shenyang Jianzhu University | Zheng Y.,Liaoning Institute of Science and Technology | And 2 more authors.
Shenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology | Year: 2015

In order to reasonably evaluate the reliability of superstructure of concrete double-curved arch bridge, a matter-element model for the superstructure of concrete double-curved arch bridge was established based on the matter-element theory in combination with the actual engineering disease. Both correlation function and correlation degree in the extension set were introduced, and the reliability of superstructure of certain concrete double-curved arch bridge was evaluated through the calculation of correlation degree in the actual reliability level. The results show that the reliability status of superstructure of bridge belongs to the second-class but is slightly deflective to the third-class, which is in good agreement with the actual engineering condition. The extension assessment method introduces the eigenvalues of grade variables, and can fully reflect the distance between the reliability degree and adjacent rank. Therefore, the proposed method can overcome the shortcomings of leap type assessment in traditional assessment methods and realize the continuous reliability assessment, and has broad application prospects in other engineering fields. ©, 2015, Shenyang University of Technology. All right reserved.


Zhang Y.,Shenyang Jianzhu University | Li C.,Shenyang Jianzhu University | Liu J.,Shenyang Jianzhu University | Liu X.,Shenyang Jianzhu University | And 2 more authors.
Yingyong Lixue Xuebao/Chinese Journal of Applied Mechanics | Year: 2015

To study box type concrete beams strengthened with steel plate on flexural properties and influencing factors, eight box type concrete beams are designed with different concrete strength, reinforcement ratio, amount of reinforcement steel plate and U-shaped hoop spacing, corresponding bending tests are carried out. Results show that the flexural performance of the beams can be well improved by steel plate strengthened. The destruction phenomenon of unreinforced box type concrete beams manifests as over bar, reinforced concrete compression zone is crushed, tensile reinforcement and steel plate are yield, and debonding failure phenomenon does not occur between steel plate and concrete. The yield load is significantly improved by steel plate strengthened by 45%~143%, and ultimate load of beams improved by 74%~183%. Steel plate strengthened is a passive strengthened, which has little effect on the crack load, the stiffness of strengthened beams can be significantly improved by strengthened with steel plate. The stiffness, yield load and ultimate load of box type concrete beam are increased with the increase of concrete strength, reinforcement ratio, reinforcement ratio and U-hoop spacing. The strain of steel plate grows rapidly and strain of reinforcement is limited after reinforcement yielding. The strengthened material is useful so the steel plate strengthening may achieve good effects. © 2015, Editorial Departmentof CJAM. All right reserved.


Zhang Y.,Shenyang Jianzhu University | Ma L.,Shenyang Jianzhu University | Liu N.,Shenyang Jianzhu University | Zheng Y.,Liaoning Province Building Materials of Supervision and Inspection | And 2 more authors.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2014

Plain chloroprene rubber bearings of highway bridge are more vulnerable to corrosion of acid precipitation. In order to research on the various mechanics performance of plain chloroprene rubber bearings of highway bridge under different acid corrosion condition. The chloroprene rubber bearings were dealt with 3.0% sulfuric acid for 20d, 40d, 60d and 80d, and the compressive behavior of those were tested with pressure testing machine. The apparent, dimension, ultimate compressive strength, vertical stiffness and elastic modulus of compression were analyzed comparatively. The results show that local deformations of plain chloroprene rubber bearings of highway bridge become more obvious and brittle failures can happen more easily with the increase of contact time with acid corrosion. The attenuation law of the ultimate compressive strength of plain chloroprene rubber bearings of highway bridge under acid corrosion condition is analyzed, and the parameters of the degradation model are estimated by the least square method. Moreover, the ultimate compressive strength, vertical stiffness and elastic modulus of compression are more significantly decreased. The ultimate compressive strength, vertical stiffness and elastic modulus of compression cannot meet the engineering requirement while acid corrosion to a certain degree. Thus, some preventive measures should be taken to pre-vente plain chloroprene rubber bearings of highway bridge corroding.


Zhang Y.,Shenyang Jianzhu University | Shan C.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Xiong W.,China Communications Construction Company Ltd. | And 2 more authors.
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2013

The climate has a great impact on highway bridge rubber bearings than on building rubber bearings. In order to study the change of the mechanical properties during the life of the plain chloroprene rubber bearings of highway bridge under freeze-thaw cycle condition, the plain chloroprene rubber bearings were processed 25, 50, 75, 100 times by freeze-thaw cycle in the standard freeze-thaw chamber, then the axial compression tests were carried. The changes of the performance indicators in the bearing capacity, the ultimate compressive strength, vertical stiffness, elastic modulus under different freeze-thaw cycles were analyzed comparatively. The results show that the plain chloroprene rubber bearings are more prone to brittle failure after the freeze-thaw cycle, and the failure phenomena of steel plate exposing or cracks is more serious than the phenomena of the standard specimen. With the increase of the number of freeze-thaw cycle, the ultimate bearing capacity, ultimate compressive strength and compressive elastic modulus of the plain chloroprene rubber bearings decrease. The attenuation formula and decay curve in 50 years of ultimate compressive strength and elastic modulus of compression are analyzed by least square method, the trends of change are both in line with the exponential function. The mechanical properties of plain chloroprene rubber bearings of highway bridge significantly decreased under freeze-thaw cycle condition. therefore, the temperature ranges of plain chloroprene rubber bearings of highway bridge should be strictly controlled, and some suggestions, such as increasing its minimum applicable temperature, using the natural rubber bearings as much as possible in cold regions, have been given.


Zhang Y.-N.,Shenyang Jianzhu University | Shan C.-H.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Shen X.-J.,Chongqing Highway Engineering Quality Inspection Center | And 2 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2013

The impact of climate is more serious to highway bridge rubber bearings than building rubber bearings. In order to study the change on the shear properties of plain chloroprene rubber bearings of a highway bridge affected by climate change, the changes of low-temperature climate are simulated by using a standard freeze-thaw chamber. The plain chloroprene rubber bearings are processed 25, 50, 75, 100 times, then the shear tests are carried. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness, and elastic modulus of shear of plain chloroprene rubber bearings of a highway bridge under a freeze-thaw cycle condition are studied through the contrastive analysis. The results show that the plain chloroprene rubber bearings are more to failure under a freeze-thaw cycle than the standard sample. The exposure of a steel plate and cracks destructive phenomenon are more serious. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness, and elastic modulus of shear of plain chloroprene rubber bearings decreased with freezing and thawing increasing. The decay curve and attenuation formula in 50 years of ultimate shear strength and the elastic shear modulus of plain chloroprene rubber bearings are developed by the least square method, and decay trends of ultimate shear strength and elastic shear modulus are approximately according with power function.


Zhang Y.-N.,Shenyang Jianzhu University | Shan C.-H.,Shenyang Jianzhu University | Zheng Y.,Supervision and Inspection Institute of Building Material in Liaoning Province | Shen X.-J.,Chongqing Highway Engineering Quality Inspection Center | And 2 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2012

The impact of climate is more serious to highway bridge rubber bearings than to building rubber bearings. In order to investigate the changes of the mechanical properties of plain chloroprene rubber bearings of highway bridge in high temperature of summer, the plain chloroprene rubber bearings were processed in 20, 40, 60, 80 days by high-temperature chamber, and then the axial compression tests were carried by pressure testing machine. The impact of thermal aging in carrying capacity, ultimate compressive strength, vertical stiffness, and elastic modulus of compression was analyzed. The results showed that, under thermal aging, the plain chloroprene rubber bearings was easier to brittle failure, the elastic stage was shorten, and the phenomenon which plate exposure, cracks and layered damage was more serious. With deepening of degree in thermal aging, the carrying capacities, ultimate compressive strength, vertical stiffness, and elastic modulus of compression were decreased. The dates of compressive strength and elastic modulus of compression in 50 years were analyzed using the least square method, and the results showed that the decay function and decay curve were basically in line with variation of power function.

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