Time filter

Source Type

Jiao C.-Y.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | Jiao C.-Y.,Beijing Collaborative Innovation Center for Metropolitan Transportation | Jiao C.-Y.,Tongji University | Liu L.-Y.,Beijing Collaborative Innovation Center for Metropolitan Transportation | And 3 more authors.
Gongcheng Lixue/Engineering Mechanics | Year: 2015

Because of structural features, creeping diseases can be easily produced in curved bridges. Creeping diseases will reduce driving comfort and endanger structural safety. The existing research showed that the factors of creeping phenomenon had been analyzed. Taking an overpass bridge as an example, the features of radial displacement were analyzed under the effects such as dead loads, live loads, concrete shrinkage and creep, temperature, prestress, and so on. The influences of supporting form, bearing eccentricity, and bearing form on creeping, were also discussed. The study shows that supporting form and bearing eccentricity optimization method can be used when small traffic and curvature radius were applied in curved bridges. The bearing form optimization is applicable when heavy traffic, large curvature radius and torsional stiffnesses are shown in the curved bridges. When doing optimization design for a new curved bridge, the above three method and their mixed forms can all be applied for preventing creeping diseases. ©, 2015, Tsinghua University. All right reserved.


Jiao C.-Y.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | Jiao C.-Y.,Tongji University | Zhang Y.,Beijing Inno Olympic Real Estate Development Co. | Long P.-H.,Beijing Collaborative Innovation Center for Metropolitan Transportation | Hou S.-W.,Beijing Collaborative Innovation Center for Metropolitan Transportation
Gongcheng Lixue/Engineering Mechanics | Year: 2016

There are three kinds of methods for modeling and analyzing the existing curved girder bridges. They are single-beam method, grillage method and entity method. According to the previous literature, the single-beam method is not so accurate, but it is generally popular because of its higher speed in analyzing and higher efficiency in calculating. So the research of the single-beam method has practical significance. Central angle is the key factor to determine whether the curved girder bridge can be analyzed with the single-beam method. According to A ramp bridge of Jingkai overpass, several models of curved girder bridges with different spans, deck widths and central angles are built and compared using the grillage method and the single-beam method in this paper. Then by taking 10% as the control index, the applicable condition of the single-beam method is obtained. © 2016, Engineering Mechanics Press. All right reserved.


Ji J.,Beijing University of Civil Engineering and Architecture | Ji J.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | Shi Y.-F.,Beijing University of Civil Engineering and Architecture | Shi Y.-F.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | And 6 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2015

To analyze properties and micro-structure of DCLR (direct coal liquefaction residue) blending modified asphalt, different DCLR blending modified asphalts were prepared. The base asphalt was SK-90 and the DCLR content was 5%, 10%, 15% and 20% by mass of base asphalt. The properties and micro-structures of DCLR blending modified asphalts were tested by SHRP PG, penetration system, infrared spectrometer and gel permeation chromatograph. The results indicate that the high-temperature properties of DCLR blending modified asphalts are improved, but the low-temperature and fatigue resistance of DCLR blending modified asphalts decline. Meanwhile, the DCLR modifications are mostly physical modifications based on the change of molecular weight distribution and functional group of the DCLR blending modified asphalts. ©, 2015, Beijing University of Technology. All right reserved.


Ji J.,Beijing University of Civil Engineering and Architecture | Ji J.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | Suo Z.,Beijing Urban Transportation Infrastructure Engineering Technology Research Center | Suo Z.,Beijing Collaborative Innovation Center for Metropolitan Transportation | And 6 more authors.
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | Year: 2015

In order to evaluate the effects of water and warm mix agent on adhesion capacity of asphalt-aggregate interface, based on surface free energy theory, the adhesion models of asphalt-aggregate interface and warm mix agent-asphalt-aggregate interface with or without water were established. The adhesion works between asphalt-aggregate interface and warm mix agent-asphalt-aggregate interface with or without water were calculated. Energy parameters EP1 and EP2 were constructed to analyze the adhesion capacity of asphalt-aggregate interface affected by water and warm mix agent. The results show that adhesion capacity of asphalt-aggregate interface is improved by adding warm mix agent without water. However, warm mix agents are very sensitive to water, so adding warm mix agent decreases sharply the adhesion capacity of asphalt-aggregate interface with water. ©, 2015, Xi'an Highway University. All right reserved.

Loading Beijing Urban Transportation Infrastructure Engineering Technology Research Center collaborators
Loading Beijing Urban Transportation Infrastructure Engineering Technology Research Center collaborators