A Design Method for Concrete Bridge Reinforcement Based on Tendon Stress Test Results

Abstract

The invention relates to a concrete bridge reinforcing design method based on a force rib stress test result. A test system adopted in the reinforcing design method comprises a steel strand, a surface strain gauge, a protective layer concrete chisel-away region, a stress release point, a data acquisition instrument and a cutting machine. The steel strand is coated with the protective layer concrete chisel-away region. The surface strain gauge is stuck to a steel wire at one end of the to-be-tested steel strand along the axis of the steel wires. The stress release point is arranged on a steel wire at the other end of the to-be-tested steel strand, and the point serves as the release point to conduct cutting. The data acquisition instrument is connected to the surface strain gauge through a conductor. The cutting machine cuts off the to-be-tested steel wires at the stress release point. Compared with the prior art, a reinforcing material calculation area result reckoned through the prestressed concrete bridge flexural capacity reinforcing design method based on the force rib stress test result is accurate and reliable, and the method is suitable for flexural capacity reinforcing design of a cracked and damaged prestressed concrete bridge.

Description

technical field [0001] The invention belongs to the technical field of bridge structure engineering, and in particular relates to a reinforcement design method for concrete bridges based on stress test results of tendons. Background technique [0002] With the increase of bridge operation time, the continuous increase of traffic volume, the increase of vehicle load, the accumulation of bridge damage, and the deterioration of material properties, the bearing capacity of bridges will also decrease. In order to ensure the safety of road and bridge transportation, it is necessary to Reinforcement of existing bridges. At present, the commonly used bridge reinforcement methods include: increasing section method, pasting steel plate method, pasting fiber composite reinforcement method, external prestress reinforcement method and changing structural system method, etc. Since the new reinforcement material in passive reinforcement begins to hold force after the original structural m...

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Problems solved by technology

However, there is no clear regulation on how to select the actual flexural stiffness of components with different damage degrees in different positions of the longitudinal bridge of the structure. Therefore, the actual internal force of each unit after damage cannot be obtained. The stress state of the tendon cannot be calculated, so the staged force cannot be considered in the reinforcement design

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