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Lin S.-F.,Nanjing Southeast University | Huang Q.,Nanjing Southeast University | Hu X.-F.,Jilin Provincial Highway Survey and Design Institute | Hu S.-X.,Nanjing Southeast University
Bridge Construction | Year: 2015

To study the stress distribution law of the concrete saddle in pylon of extradosed bridge and to optimize the reinforcement layout for the saddle, the Ningjiang Songhua River Bridge was cited as an example and was analyzed. By means of the MIDAS Civil, the spatial link model for the whole bridge of the bridge was established and the global mechanical behavior of the bridge was analyzed. Further by means of the ABAQUS, the solid element models for the pylon and saddle were established and the numerical analysis of the saddle was conducted, respectively using the extended finite element method and the concrete plastic damage constitutive model. The results of the analysis demonstrate that ① under the action of the stay cable forces, the concrete saddle of the extradosed bridge may produce splitting cracks through the stay cable ducts and it is proposed the diameters of the reinforcement for the saddle should be enlarged or the spacing distances of the horizontal reinforcement should be densified; ② under the action of the stay cable forces, at the abrupt junction of the saddle structure, the stress concentration may occur, the principal compressive stress values will exceed the standard values of compressive strength of the C50 concrete and it is proposed that the rounded corner or the round corner at the junction should be added and ③ the extended finite element method can be used to well predict the occurrence and propagation of the cracks, the prediction results of the method are basically agreeable with the results of the concrete nonlinearity analysis method, however, as regards the stress field calculation for the cracks, there exist some differences between the two methods. ©, 2015, Wuhan Bridge Research Institute. All right reserved.


Xu Y.-L.,Northeast Forestry University | Xing Z.-Z.,Jilin Provincial Highway Survey and Design Institute
Advanced Materials Research | Year: 2011

Deflection is the important index of asphalt pavement design and the final acceptance. Using double circular load of Design Specification and four circular load of Benkelman test vehicle, the deflection was analyzed with four kinds of common pavement structures, the results show that the deflection of theoretical calculation was the Benkelman beam test 55%-75%, but Design Specification uses the F coefficient which less than 1 to correct the difference, the two have had the contradiction. The deflection of two and three axles load mode were analyzed, and compared with the axle load conversion coefficient C1. The result could provide the reference of axle load conversion and the correction coefficient for the pavement design. © (2011) Trans Tech Publications.


Xu Y.-L.,Northeast Forestry University | Cheng P.-F.,Northeast Forestry University | Xing Z.-Z.,JILIN Provincial Highway Survey and Design Institute
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

High elasticity asphalt sand which also is stress absorbed layer as intermediate layer was put between the deck and the asphalt concrete, slow down stress difference between asphalt concrete and deck through superior deformation coordination ability, could reduced the shearing force, reduced to the bonding power request, thus reduced deck pavement destruction. Asphalt sand and composite structure performances were carried out by mechanical analysis and laboratory experiment. The result indicated that, this kind of composite structure had the good anti-distortion ability, could reduce the shearing force of deck pavement 30%, the low temperature performance and the water stable performance satisfied the request, and in order to ensure the high temperature performance, intermediate layer thickness should between 12.5cm. This research proposed a new deck pavement structure, provided the reference for the future deck pavement. © 2011 IEEE.


Xu Y.-L.,Northeast Forestry University | Zhang B.-Z.-M.,Northeast Forestry University | Tao L.,Northeast Forestry University | Xing Z.-Z.,JILIN Provincial Highway Survey and Design Institute
Advanced Materials Research | Year: 2012

The tensile test to the fiberglass geogrid had been carried on, in the normal temperature, the low temperature, the water immersion, the freezing and the freeze-thaw cycle and so on conditions. The results indicated, the fiberglass geogrid had achieved saturated after been immersed 12h, the water absorption was about 20%, the tensile strength reduced approximately 80%; the tensile strength was dropped slightly on the next freezing test and the freeze-thaw cycle test. So it could be stated that the fiberglass geogrid had the good low temperature performance. Then the interlaminar shearing test had been conducted in the different temperature to the composite structure in which the fiberglass geogrid was laid or not. The result showed that the interlaminar shearing strength had weaken about 20% when laid down the fiberglass geogrid, and along with temperature drop, the shearing strength increased gradually. This research provide the reference for used the fiberglass geogrid correctly in the cold region, had great practical value. © (2012) Trans Tech Publications, Switzerland.


Yue H.,Beijing Jiaotong University | Yue H.,Beijing University of Technology | Shao C.-F.,Beijing Jiaotong University | Guan H.-Z.,Beijing University of Technology | Duan L.-M.,Jilin Provincial Highway Survey and Design Institute
Wuli Xuebao/Acta Physica Sinica | Year: 2010

Simulation of pedestrian evacuation flow with affected visual field is carried out on the basis of cellular automata. The room to be evacuated is divided into exit visible area, wall visible area and blind area by pedestrian sight radius, and two basic dynamic parameters in the dynamic parameters model are used to simulate the varied movement characteristics of pedestrian in different evacuation areas, including normal evacuation movement, movement along the wall and movement in fixed direction. The effect of pedestrian sight radius on evacuation time is studied with evacuation signs on the wall and pedestrian stochastically moving to find the wall in fixed directions and then moving along the wall. It is observed that the evacuation time depends not only on the pedestrian sight radius but also on the length and utilization rate of exit. © 2010 Chin.Phys.Soc.

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