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Zhang Z.-Q.,Beijing University of Technology | Bai S.-W.,Beijing University of Technology | Wang G.-Z.,Daxinganling Survey and Design Institute | Wang W.-H.,Changchun Institute of Technology | And 2 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2010

To solve he problem of serious premature damage of asphalt pavement structure of Harbor-shaped Bus Stop road of Beijing, a finite element model is built by using software ANSYS to stimulate the speed-varying braking and loading of large-scale bus stop roads. The results show that during vehicle braking, the road vertical displacement and horizontal shearing stresses of superficial pavement layer is increasing, and the horizontal shearing stresses of pavement layers alternate between positive and negative changes. The location of maximum shear stress of pavement layers varies under the moving load, and the most likely shear failure occurs in the part of asphalt layer and at the location of combination asphalt layer with base course. The horizontal shearing stresses increase obviously and the vertical displacement increases little with increasing braking acceleration. Therefore, attention should be paid to enhancing the strength of structure layers and to improving the shear strength in design of Harbor-shaped Bus Stop asphalt pavement under frequent braking and loading.

Wang W.-H.,Jilin University | Wang W.-H.,Changchun Institute of Technology | Wang Q.,Jilin University | Zhao W.-D.,JiLin Province Highway Survey and Design Institute
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2011

In order to protect the slope and the natural environment alongside mountain in highway, three-centered circular arch with oblique slant steel pillars support system was constructed. Cut and cover method, tunneling method, arch protection and other excavation methods were taken according to different depths, so it can protect the ecological environment and maintain the stability of the slopes. Numerical simulations analysis of plane strain at the most disadvantageous position indicated that three-centered circular arch with oblique slant steel pillars support system with the principal tensile stress of 1.44 MPa, principal compressive stress of 3.24 MPa and displacement of 2.1 mm, was rational on the seasonal frozen region weather conditions, accorded with norm requirements in safety. The structural style of shed-tunnel and measures of waterproof and drainage was designed, which fit for the seasonal frozen region. It supplied experience for highway construction alongside mountain in the seasonal frozen region, fully embody building concepts of disaster prevention and environmental protection.

Wang W.-H.,Changchun Institute of Technology | Ju Y.-H.,JiLin Province Highway Survey and Design Institute | Zhao W.-D.,JiLin Province Highway Survey and Design Institute | Qu J.,JiLin Province Highway Survey and Design Institute
ICCTP 2010: Integrated Transportation Systems: Green, Intelligent, Reliable - Proceedings of the 10th International Conference of Chinese Transportation Professionals | Year: 2010

This paper analyzed the scientific & technical traffic data from the in Jilin Province. The Structure of the High Fill Culvert in Mountain Areas, including the structure from of high fill culverts were further researched in this article. Combined with the nonlinear soil pressure calculation theory of unloading arch and the variational rule of soil pressure of the high fill culverts along with the fill height and the precarious characteristics of arch effect, the new structure form fitting for high fill culverts were put forward. The arch ring of arch culvert and slab culverts were replaced by prefab reinforced concrete bars with little curvature. These arches were connected with concrete abutment capping. Using finite element theory, the load bearing superiority and rationality of prefab reinforced concrete bar with little curvature arches (ratio of rise to span is 1/20, arch axis is circular arc line, the other dimensions are the same as the slab culvert) was analyzed under the same load. The results show that under the condition of the same fill height, the midspan moment will decrease by 16.1 using hinge-jointed little curvature arch bars with little curvatures. The midspan moment decreased by 7.4 by using rigid- connected little curvature arch bars. In the high fill culverts, the use of prefab reinforced concrete bar with little curvature arches reduced the erection time, decreased costs by 25, and increased the safety coefficient. The use of these bars are considered to be promising for future culvert applications. © 2010 ASCE.

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