Entity

Time filter

Source Type


Liu Z.,Central South University | Liu Z.,Shantou University | Liu Y.,Guangdong Hualu Transportation Technology Co | Fu H.,Central South University | Li L.,Central South University
Engineering for Progress, Nature and People | Year: 2014

Large volume of high-speed railway infrastructure have been constructed in China, which are very important to the economic development of China. However, whether these structures can stand for dynamic loading such as blast load, wind load, moving load and seismic load is very crucial to the safe operation of them. The effects on the bridges from above dynamic loads such as wind load, moving load and seismic load have been investigated, but the blast load effects have been studied very little, especially to the high-speed railway infrastructure. Since blast load is a kind of short duration dynamic loading influencing structural response significantly, which often exhibits strong spatial and time variations, resulting in sharp stress gradients in the structures. Consequently, the analysis of bridge structures subjected to blast loading becomes a very complex issue and it is hard to analyze accurately deformation or crack conditions of bridges subjected to blast wave using equations. On the other hand, experiments on real bridge are so exhibitive that it is hardly carried out. So in recently years numerical simulation technique become very important tool to investigate such issues. In this paper, the prestressed pier of high-speed railway bridge is selected as the research target, 3D numerical simulation models are used to analyze the dynamic response and damage mechanism of it subjected to blast loading. The numerical simulation method such as algorithm, constitutive model, failure model and contact algorithm are also discussed in the following contents. Source


Wu C.-H.,South China University of Technology | Wu C.-H.,Guangdong Hualu Transportation Technology Co
Applied Mechanics and Materials | Year: 2011

This paper aims to explore the reasonability of an evaluation method on high temperature performance of asphalt mixture through a series of experiments. The first step of these experiments is to formulate specimens of different high-temperature performances by Gyratory Testing Machine which simulates the on-road pavement to the most extent, and then adopt triaxial dynamic compression test to compare and analyze high-temperature performances of these specimens. By introducing concepts and indicators such as validity, reliability, discrimination, this paper evaluates comprehensively the discrimination results of various compression test parameters on high-temperature performance of asphalt mixture. It concludes that the evaluation effect of compression stiffness modulus is best, followed by the slope of logarithmic creep curve and accumulated strain area, and the evaluation effect of final compression strain is comparatively poor. That provides an objective evaluation method on high temperature performances of asphalt mixtures. © (2011) Trans Tech Publications. Source


Wu C.,South China University of Technology | Wu C.,Guangdong Hualu Transportation Technology Co
Geotechnical Special Publication | Year: 2011

This paper carried out a research on variable paramenters of GTM tests of different asphalt mixture. A correlative analysis was made between those parameters and laboratory results of the corresponding triaxail repeated load creep tests. The paper concludes that Parameter K1 of compaction curve which is obtained from GTM test (K1 here refers to the average slope of compaction curve from the start of compaction to 97% density) can show high temperature stability performance of asphalt mixture better as Parameter K1 has a good correlative relationship with creep stiffness modulus of triaxial repeated load creep test, and the linear correlation coefficient is above 0.90. Thus, it can be adopted as a simple and practical method to evaluate high temperature stability performance of asphalt mixture. © 2011 ASCE. Source


Fang Y.,Highway Traffic Safety and Emergency Protection Technology and Equipment Transportation Industry R & nter | Fang Y.,Guangdong Hualu Transportation Technology Co | Yan C.,Highway Traffic Safety and Emergency Protection Technology and Equipment Transportation Industry R & nter | Yan C.,Guangdong Hualu Transportation Technology Co | And 4 more authors.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Structure and composition was researched by elemental analysis, scanning electron microscopy and infrared spectrum. Mixing process and road performance of central plant hot recycling mixture modified by American gilsonite were researched. The result shows that it's technically feasible for American gilsonite to modify central plant hot recycling mixture. The American gilsonite influence law to hot recycling mixture is consistent with the conventional asphalt mixture. High temperature stability of hot recycling mixture increase is especially obvious due to common effect of American gilsonite and old asphalt in the reclaimed asphalt pavement(RAP). Bonding property of asphalt and aggregate is improved with gilsonite softening and heteroatom group adsorption. American gilsonite powder increases asphalt viscosity and mixture film thickness to improve water stability of hot recycling mixture. ©, 2015, Wuhan University of Technology. All right reserved. Source


Wu C.,South China University of Technology | Wu C.,Guangdong Hualu Transportation Technology Co | Liu Y.,Guangdong Hualu Transportation Technology Co
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2012

With the impact of high temperature and heavy traffic, asphalt pavement of expressways is facing a severe situation. It is urgent to solve the problem on how to prevent and reduce rut. By applying the method of GTM and Marshall, this paper carries out proportion design for the commonly used asphalt mixture for pavement in Guangdong province and it identifies the similarities and differences between GTM method and Marshall method. By integrating advantages of two methods, this paper improve the proportional design of anti-rutting asphalt mixture. In addition, by the analysis of comparative experiment of road performance, it shows that not only the high-temperature performance of asphalt mixture designed by the improved method more than doubled compared with the result by Marshall method, but also the water resistance stability of it is improved due to the decrease of void volume. Source

Discover hidden collaborations