Papers by Keyword: Hollow Slab Bridge

Abstract: Relative displacement method is considered to be one of the most direct methods used for rapidly and conveniently evaluating the deterioration of hinged joints in fabricated hollow slab bridges. Based on the relative displacement method, a statistical analysis on the results from the measured 265 diseased hinge joints in 11 bridges was conducted in this paper. The status of hinge joints can be classified into four regimes of perfect, micro damage, damage and failure according to a dimensionless damage evaluation index η, whose value was also presented in the paper. Finally, the reasonable strengthening time and strategies for hinged joints and corresponding strengthening strategies were proposed based on the parameter η.

Abstract: For the reinforced concrete hollow slab bridge with six spans is in Shandong, Zhucheng province. Through the general inspection, special inspection and checking and analysis of bearing force. We make a comprehensive evaluation of bearing force and working conditions. So it could provide detailed reference material and data for future maintenance.

Abstract: Structural defects and heavy traffic make the hollow slab bridge serious diseases, such as “Single Beam Bearing”. Transverse prestressed tendons (TPTS for short) is an effective methods to solve this problem. A detailed test study of hollow slab bridge modeled by plexiglass with TPTS is done in this article. The analysis parameters include the TPTS’ layout and the value of prestress. The test results show that TPTS can effectively even the transverse load distribution, and improve the integrity of bridges.

Abstract: There are some common diseases occurred on hollow slab bridge often, such as large deflections and Single Beam Bearing caused by insufficient strength of hinge joints, and so on. Transverse prestressed tendons (TPTS for short) is an effective methods to solve the above diseases. A detailed analysis of hollow slab bridge with TPTS is done by FEM in this article. The analysis parameters include the TPTS layout and the value of prestress. The results show that the TPTS can effectively even the transverse load distribution, and improve the integrity of bridges.

Abstract: For the purpose of the study of the mechanical mechanism of beam-reduction and rib-addition strengthening method as well as the difference between hinged beam method and rigidly connected beam method, finite element models are established for hollow slab bridge before and after strengthening respectively with the finite element software Ansys. The stress distributions on hollow slab bridge before and after strengthening are compared through numerical simulation analysis. The improvement effects of beam-reduction and rib-addition method on the transverse connection and stress state of hollow slab bridge are analyzed at the same time. It is proved that this strengthening method is of obvious effect and the bearing capacity of the existing bridge can be greatly enhanced. Meanwhile, the result of numerical simulation analysis shows that the beam-reduction and rib-addition hinged beam method and rigidly connected beam method have the similar effects. Both of them result in much improvement of transverse distribution and enhancement of transverse connection. But the rigidly connected beam method has a better overall rigidity and a tighter transverse connection. Its improvement effect on the stress state of the old beam slab is superior to that of the hinged beam method.

Abstract: Simply supported hollow slab bridge is widely used in highway network of China. Under overload vehicles, the concrete hinges of such bride are easily damaged, which usually causes single slab bearing and tremendously reduces the bridge’s load capacity. It is necessary to take some reinforcement measures to enhance the carrying capacity of such impaired bridge for traffic safety. In this paper, a field reinforcement experiment of an actual hollow slab bridge, which has experienced a destructive test with its transverse connections seriously damaged, was performed by applying external transverse and longitudinal prestress to it. The strengthening scheme adopted in this experiment was detailed. By means of static truck load test, the variation of deflections of the bridge before and after strengthening was obtained. The test results showed that the proposed strengthening method can effectively enhance the damaged hollow slab bridge’s transverse stiffness and improve its bearing capacity.

Abstract: For hollow slab bridge, its concrete hinge joint is prone to be damaged under overload vehicles, as weakens the transverse integrity of bridge, leads to single slab bearing and threatens the safety of service. Aiming at the problem, a strengthening experiment of an actual concrete hollow slab bridge, which has experienced a destructive test with its transverse connections seriously damaged, was performed by applying external transverse prestressing to it. The strengthening design and construction technology of external prestressing were introduced. By means of truck static load test, the variation of deflections and strains of the bridge before and after strengthening under different tension force was obtained, and the influence of tension value to strengthening effect was emphatically analyzed. The test results proved the effectiveness of the strengthening method and some improvement suggestions were also presented.