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Li N.,Chinese Research Institute of Highway | Zhang D.-S.,Shaanxi Provincial Communication Construction Group | Han W.-W.,Chinese Research Institute of Highway | Shen A.-Q.,Changan University
Advanced Materials Research | Year: 2014

To study the effect of different dosage of recycled asphalt mixture particles on the performance of concrete, the mechanical characteristics, shrinkage performance and durability testing were performed, the results show that the compressive strength and flexural strength of concrete are decreased with the increase of dosage recycled asphalt mixture particles, while still meet the regulatory requirements; the capability of plastic shrinkage resistance can be improved by incorporated recycled asphalt mixture fine particles, yet slight effective on the temperature shrinkage; the durability of concrete changes as a result of incorporation of recycled asphalt mixture fine particles, the durability of concrete with a dosage of 20% is considered in the optimal state, so the recommended dosage is 20%. © (2014) Trans Tech Publications, Switzerland. Source

Zhao B.-J.,Changan University | Zhao B.-J.,Shaanxi Provincial Communication Construction Group | Zhu G.-R.,Shaanxi Provincial Communication Construction Group | Yin L.,Shaanxi Provincial Communication Construction Group
Applied Mechanics and Materials | Year: 2014

In order to study the stress of box-girder web under prestressing, and confirming the internal stress distribution of the web, analyzing of vertical prestressed box girder, curved beam prestressed sensitivity under the webs. Establishing finite element model of the box-girder webs vertical prestressing effect is analyzed, results show that the principal tensile stress of the web is sensitive to the vertical prestress, applying the vertical prestress can effectively reduce the principal tensile stress of the web; with the decrease of the effective vertical prestress, the neutral axis above the principal compressive stress decreases rapidly, while below the neutral axis decreases relatively slow; Under the same vertical preloading stress level, the roots of cross section of the compressive stress of web reserves than L/4 section of the web. © (2014) Trans Tech Publications, Switzerland. Source

Hu D.,Changan University | Qu T.,Changan University | Wang H.,Shaanxi Provincial Communication Construction Group | Chen L.,Changan University
Applied Mechanics and Materials | Year: 2013

There are few researches on seismic response of reinforced concrete rib arch bridges at present; therefore, it is necessary to analyze seismic performance of this kind of bridges. Based on the engineering background of a three-span reinforced concrete rib arch bridge, a full bridge finite element model is built to analyze the structural dynamic characteristic and seismic response of the bridge. The internal forces and displacements of each key section is compared and discussed when the bridge is excited by horizontal unidirectional ground motion or the combination of vertical and horizontal ground motion. The structural seismic response calculated with different analysis methods is compared. The research results of this study can be used as a reference for the seismic design of similar bridges. © (2013) Trans Tech Publications, Switzerland. Source

Wang Z.-W.,Changsha University | Chen X.-L.,Changsha University | Li C.-L.,Shaanxi Provincial Communication Construction Group
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2015

To provide reference for management and control of cascading failure behavior for road traffic network, the method to identify and sort influence sources of cascading failure was analyzed according to road traffic complex network characteristics. The load-capacity model was improved to describe cascading failure behavior of road traffic network, where the ratio of the failure sections was used to depict the degree of damage. Based on the method of comparative analysis, the recognition algorithm was devised to distinguish the importance of influence source in accordance with the change degree of the failure consequence. Based on orthogonal experiment method, the procedure was built to sort the importance of influence sources in the light of range value. The results show that reserve capacity coefficient, travel network topology, travel total demands, route choice behavior, and attack mode are all important influence sources of cascading failure, and the importance sequence from big to small is attack mode, travel total demands, reserve capacity coefficient, travel network topology, and route choice behavior. ©, 2015, Xi'an Highway University. All right reserved. Source

Weng X.-L.,Changan University | Zhang C.,Henan Zhongyuan Expressway Co. | Li C.-L.,Shaanxi Provincial Communication Construction Group | Shang S.-P.,Changan University | Li H.-Y.,Changan University
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2013

In order to clearly describe the additional deformation of pavement layers between the old and new subgrade with differential settlement, a full scale model test was carried out to study the strain response of asphalt concrete pavement layer using a large subgrade differential settlement platform. The results indicate that the entire pavement is in tension under the foundation differential settlement and the lower layer is more affected; plastic deformation will develop in surface layer when the differential settlement reaches 14 cm; geogrid in old and new subgrade can alleviate the lower foundation differential settlement and increase the additional deformation of the pavement; to some extent, the vehicle load can alleviate the additional deformation due to the differential settlement; upon the occurrence of hollows under the pavement, deformation will be reflected in the asphalt pavement layers in the form of crown under the action of gravity. Source

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