Papers by Keyword: Bridge Deck

Abstract: As the problem of asphalt concrete bridge deck pavement is becoming more and more serious, how to improve its road performance has become the focus of the study. As the lack of shear strength and bond strength between layers, flaking, raveling and other diseases were occurred on steel bridge deck asphalt pavement. This paper combines the common damages of bridge deck and asphalt concrete pavement in cold area of northeast region, focuses on the analysis of the cause of asphalt concrete pavement damage causes, puts forward preventive measures and recommendations, and present the bridge deck pavement structure in cold area combined with the engineering practice. The research results can effectively guide the construction of bridge deck pavement.

Abstract: The contribution focuses on the effect of selected input parameters on probabilistic estimation of chloride induced reinforced concrete bridge deck corrosion initiation. The reinforced concrete bridge deck with steel protected by epoxy-coating is considered. A finite element diffusion model in conjunction with a probabilistic method using Monte Carlo technique is used to address the inherited randomness of input variables. Presented parametric study shows the sensitivity of estimation of the corrosion initiation likelihood on variation of input parameters.

Abstract: In order to resolve the steel corrosion problem in bridge decks, glass fiber reinforced polymer (GFRP) has been recommended as a substitute to the conventional steel reinforcement in bridge decks. However, the use of GFRP bars in bridge decks is still limited by several concerns, including the long-term durability of GFRP bars in the concrete under sustained loadings. Literature review showed that the tensile strength reduction of the GFRP bar should be governed by the sustained stress level in the GFRP bar. In this regard, a GFRP reinforced concrete deck was simulated in this paper, aiming to investigate the sustained stress levels in the GFRP bars through three dimensional finite element (FE) modeling. Per AASHTO LRFD specifications, one lane loaded and two lane loaded cases were examined to identify the maximum tensile strains in the internal GFRP bars subjected to dead loads and HL-93 design loadings. The FE results showed that the maximum tensile stresses in GFRP bars under service loads were less than 1% of the GFRP design strength, which implied that the GFRP bars could have excellent long-term performance in real concrete bridge decks.

Abstract: An experimental study of an aeroelastic behavior of bridge deck under influence of the wind is carried out in a wind tunnel. Particular attention is paid to seldom analysed influence of the traffic upon the aeroelastic coefficients, known as flutter derivatives, characterising the dynamic response of a bridge deck. The results are compared to those of thin plate with high aspect ratio, which is proven to be aerodynamically stable.

Abstract: In order to guarantee the safety and smooth of road traffic in low temperature season, deicing salt is usually adopted to solute the problem of bridge deck snow. However, the frequent use of de-icing salt causes the salt frozen erosion damage of concrete, at the same time, it induces to internal corrosion of steel bars and concrete material performance, furthermore, it will also result in the bridge structure durability degradation, shorten the service life of the bridge. Aiming at this phenomenon, this paper analyzes the mechanism of concrete frost damage, and put forward the corresponding prevention measures.

Abstract: In the engineering background of zhijang bridge, shell finite element model of steel box girder segment was established by the ABAQUS finite element program. The transverse stress of the bridge deck was analyzed by two cases of body cable and external cable, and the transverse stress of the bridge deck caused with deadweight and vehicle load was been compared. Conclusions obtained mainly include: the transverse stress of the bridge deck induced by the four cases were not large, if lateral inclination of stay cable was not particularly large, the transverse stress of the bridge deck caused by space cable can not be given special consideration.

Abstract: Concrete is globally the most widely used construction material featuring outstanding properties as e.g. high mechanical strength, global availability, low cost and high durability if properly made. However, concrete exhibits also numerous intrinsic drawbacks as e.g. low tensile strength, poor elasticity, in many cases poor adhesion to various substrates and the formation of cracks and thus reduced durability. Many if not all of these drawbacks can be compensated by the addition of environmentally friendly water-based polymer dispersions. This article focuses on the fundamental understanding of the interaction of polymers with the other components in concrete, and its impact on the properties of latex-modified concrete (LMC), such as rheology, mechanical properties, adhesion, abrasion resistance etc. As a practical example the application of LMC in North American bridge deck overlays is discussed. Special attention is thereby paid to concrete mix designs, performance enhancement and the durability of these materials in the field.

Abstract: Bridge decks in composite bridges endure local vehicle load directly and failure is apt to occur in bridge decks, so the decks in Jiubao Bridge were designed to be renewable components. Space finite element model of Jiubao Bridge was established. Stress variation of upper and lower edge of the girder under dead load was analyzed when each deck changed locally. Stress variation processes of various whole span replacement plans had been analyzed and the stress envelope was obtained. The calculation results show that local bridge deck replacement has no obvious influence on the steel girder stress. While the plan that remove bridge decks from mid-span to arch foot has less influence on the girder stress compared to other whole span replacement plan.

Abstract: The finite element model is built by ANSYS, and the distribution of stress is studied. The stress intensity of each layer is computed by Tsai-Wu stress intensity standard. The value computed by Tsai-Wu stress intensity standard under given loads are smaller than 1, and the GFRP bridge deck is in a safe state. The first ply failure is also studied, and the result shows that the first ply failure value is determined by the webs when the webs are very thin. Other circumstances the value is determined by the size of the top and bottom plate. The material utilization is the highest when the thickness of the bottom is equal to the whole webs and a little thinner than the top plate.

Abstract: In order to study the reasonable thickness and width of bridge decks of concrete T beam bridge, 36 ANSYS finite element models of simply supported concrete T beam were established, stress performance of each models have been analyzed under the centre load. The analysis results indicated that when the bridge deck thickness reached 22cm, it was no much sense of influence of bridge decks stress and deflection change by increasing the thickness of the bridge deck, therefore, the recommended value of deck thickness was about 22cm. Since the width of the bridge deck has little effect of the mechanical properties and stiffness of it, so the recommended values of the bridge decks width should be determined combined with the diaphragm and the integral stiffness of T beam bridge.