检索结果-南通市图书馆

Comparative Study on Test Performance of Two Kinds of High Modulus Asphalt Concrete for the steel bridge deck

在线全文

学校读者我要写书评

暂无评论

Journal of Architectural Research and Development 2021年第2期5卷 21-24页

作者： Jianlin Yuan Junjie Yang Yunnan Kunyu Expressway Development Co. Ltd.Kunming 650200Yunnan ProvinceChina Yunnan Zhongtong Highway Investigation Design Co. Ltd.Kunming 650000Yunnan ProvinceChina

Along with the popularization and application of the steel bridge in China,due to the high modulus of asphalt concrete with good waterproof,anti-fatigue,anti-aging and good performance,asphalt concrete with high modulus was widely used in steel bridge deck pavement,the test and comparative study of high modulus asphalt concrete were carried out based on two types of common high modulus asphalt concrete which include the casting type asphalt concrete and epoxy resin modified asphalt concrete,aims to further explore the performance features of the steel bridge deck with high modulus asphalt concrete,and provide help on the application of this asphalt concrete on the steel bridge deck.

关键词： steel bridge deck High modulus Asphalt concrete Test performance

Effect of crack-closure treatment on fatigue durability of cracked rib-to-deck welded joints in steel bridge decks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2019年第9期26卷 2554-2568页

作者： WANG Qiu-dong JI Bo-hai FU Zhong-qiu YE Zhi College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China

To evaluate the effect of treating long cracks with the impact crack-closure retrofit(ICR)technique,three rib-to-deck welded specimens with a crack length of about 100 mm were *** metallographic structure,crack section,crack propagation life,and stress variation were ***-element models were also developed,and some optimal values of certain parameters are suggested according to the simulated *** results show that new crack sources are generated on both sides of the ICR-treated region because of the stress *** fatigue lives of cracked specimens with long cracks are significantly improved by the *** residual compressive stress is also induced,and so it is suggested that the optimal impact angle to be applied to real bridges should be 70°.The stress at the weld root is distributed uniformly with the crack closed,and the optimal crack-closure depth is 4 *** evaluate the effect of different crack-closure depths in tests,it is recommended that a hot-spot stress method which is extrapolated by three reference points should be adopted.

关键词： steel bridge deck fatigue durability impact crack-closure retrofit technique fatigue life stress distribution

Interfacial behaviors of epoxy asphalt surfacing on steel decks

在线全文

学校读者我要写书评

暂无评论

Journal of Southeast University(English Edition) 2007年第4期23卷 594-598页

作者：陈先华黄卫钱振东东南大学交通学院南京210096

A model for predicting the interface behavior of epoxy asphalt and steel composite beam under negative bending is developed incorporating partial interaction theory. Interfacial slips between the steel deck and the epoxy asphalt surfacing are included in the model with a new parameter of membrane stiffness. A series of analytical equations based on this model are derived to calculate slip and strain at the interface. Also, a numerical procedure for calculating the load responses of simply supported composite beams with concentrated force at the mid-span is established and verified with two samples. Characters of slip and strain at the interface, sensitivities of tensile stress and interface shear stress with material parameters are studied. It can be concluded that interfacial effects decrease the bending stiffness of the composite; hard and stiff bonding material is better for asphalt surfacing layer working at normal to low temperatures, and the damage of the asphalt surfacing layer will be accelerated with the damage accumulation of the bonding coat.

关键词： epoxy asphalt surfacing steel bridge deck interfacial behavior composite beam

Analysis of structural hot-spot stress in orthotropic plates

在线全文

学校读者我要写书评

暂无评论

Engineering Sciences 2012年第3期10卷 88-92页

作者： Chen Ce Ji Bohai Xu Hanjiang College of Civil and Transportation Engineering Hohai University Nanjing 210098 China Jiangsu Provincial Yangtze River Highway bridge Construction Commanding Department Taizhou Jiangsu 225321 China

On the basis of the actual steel deck structure of Taizhou bridge, this paper carries out hot-spot stress analysis on some key spots by using the finite element model which simulates local structure of orthotropic steel bridge decks. A finite element model is established for local structure of orthotropic steel bridge decks, and in the analysis of linear elasticity of the structure, face load is employed to simulate the loads from vehicle wheels. Analysis results show that main stresses are relatively heavy at the joints between diaphragm plates, top plates and U-shaped ribs and the joints between diaphragm plates and U-shaped ribs. These joints shall be regarded as key points for hot-spot stress analysis. Different mesh densities are adopted in the finite element model and the main stresses at different hot spots are contrasted and linear extrapolation is carried out using extrapolation formulae. Results show that different mesh densities have different influences on the hot-spot stresses at the welded seams of U-shaped ribs. These influences shall be considered in calculation and analysis.

关键词： steel bridge deck local structure mesh density hot-spot stress