Main Arch Ring Research Articles

Seismic Analysis of Long Span Double-Curved Arch Bridge

Take one long span double-curved arch bridge as the example, built the finite element model of bridge structure and analyzed the modeling method, dynamic features and response under ground motion. It demonstrates that response spectrum method could meet the calculation requirement in seismic analysis of the double-curved arch bridge, and the result accords with time-history analysis method. Bridge vibration type is dispersing in quality distribution of double-curved arch bridge; it should take adequate vibration types in bridge combination. At frequent earthquake, it is actual to considerate the coalition function between arch crown structure and the main arch ring. But at rare earthquake, the arch crown buildings of masonry structure is easy to be damaged, it is not suitable to considerate the coalition function in bridge reinforcement.

Calculating Analysis of Reinforcing Layer Utilization on Stone Arch Bridge Strengthened by Composite Main Arch Circle Method

The calculation formulas for concrete and steel utilization rate of reinforcing layer have been deduced, in view of the underutilization of reinforcing layer material by composite main arch circle method. The calculation formulas is defined as load bearing capacity of reinforcing layer divided by the ultimate bearing capacity of reinforcing layer, combined with initial strain of main arch ring before reinforcement and reinforcing layer section edge strain, take compression zone partial of reinforcing layer subjected to tension and compression as example. The calculation formulas for concrete utilization rate of reinforcing layer is divided into 2 types according to the height of compression zone and on the edge of compressive strain in the reinforcing layer, the calculation formulas for steel utilization rate of reinforcing layer is divided into 1 types according to tension strain of the steel. The results show that controlling the stress and strain of stone arch bridge before reinforcement can make full use of compression resistance on main arch ring, strength of materials and reduce the waste of materials relying on engineering example. The calculation formulas provide the theoretical basis for calculation and design of the similar reinforcement structure.

Internal Force Calculation of Two-Way Curved Arch Bridge

Because of two-way curved arch bridge with low design load, less structural steel, improper construction, overloading and poor integrity, when the bridge structure can’t satisfy the carrying capacity and traffic capacity requirements, we urgently need reinforce the bridge, which has become an important link of safety assessment and insurance of the bridge structures. Internal force calculation of two-way curved arch bridge is done, and calculation conclusions of Aohan Bridge are shown. Plane rod unit’s calculation results show that the bridge under the action of steam-20, hang-100 loads, eccentricity of the section at the arch feet in main arch ring beyond allowable eccentricity, a state of large eccentric's stress appears, and on surface of the arch feet appeared tensile crack in the load simulation. The calculation results of the main arch ring shows that a phenomenon of stress concentration exists in the arch feet, in addition to the influence of big eccentric. Technology processing should be considered when do the arch feet reinforcement. Data from the arch ring calculation results, the bridge has certain overload potential. But according to the bending moment distribution, strengthen the resistance bending moment in the arch feet, an allow full play to the potential of concrete iron in the arch rib under the premise of reinforced the positive bending moment.

Internal Force Calculation Method of the Double-Curved Arch Bridge Reinforcement Based on Stress Superposition

Increasing the section method is the commonest method in double-curved arch bridge reinforcement. In order to research on the force condition of main arch ring in double-curved arch bridge reinforcement, we use internal force superposition method and stress superposition method to deduce the stress distribution of arch ring, and make contrastive analysis on each construction stage in bridge reinforcement. Internal force superposition method is unsafe; the stress superposition meets the actual situation.

Force Analysis Methods and Experimental Research on Double-Curved Arch Bridge

Research on section conversion of main arch ring and computation theory of lateral distribution in double-curved arch bridge. Through analyzing load experimental data of ShuiWen bridge, it demonstrates that the plane system finite element method is simple and practical compared to three-dimensional physical model in double-curved arch bridge computation, and the accuracy meets the design requirement .To double-curved arch bridge with spandrel arch, it can put loads distribute averagely on main arch ring to compute, the result is security without regard to joint action of above arch structure

The Reinforcement and Optimum Design of JiShan Bridge

In this paper, Jishan Bridge is taken for example to introduce a strengthening method focusing on strengthening the vault and arch foot control sections and making full use of the surplus cross section to thicken the main arch ring, i.e., the special-shaped section arch-strengthening method, and put forward the reasonable construction procedure. Subsequently, the strengthening effect is verified from three aspects: static load test, dynamic reliability-based post-strengthening life prediction and strengthening economic indicators. Finally, the finite element software ANSYS is used for further study on the strengthening Optimum design.

Construction technology of concrete reinforcement for the main arch ring of double-curvature arch bridge

Construction technology of concrete reinforcement for the main arch ring of double-curvature arch bridge

Erection of Pearl Bridge by Bear Angle Vertical Swivel Method

Bear Angle Vertical Swivel Method for arch bridge has been developed for many years overseas and obtained stated success such as Kobaru Valley Bridge in Japan and ArgenLobel bridge in Germany, this method is in the researching period right now in China. During the processing of construction, concrete of arch rib was casted vertically and then rotated, main arch ring was casted vertically by formwork climbing technology, main arch ring was laid to completed bridge elevation by using continues jacks, forming a set of swivel construction method for arch bridge.