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The Study on External Prestressing Technique in Bridge Strengnening

Author: WanZhiWei
Tutor: HuZhiJian；MengXianLi
School: Wuhan University of Technology
Course: Traffic and Transportation Engineering
Keywords: External prestressing Bridge reinforcement Theoretical analysis
CLC: U445.72
Type: Master's thesis
Year: 2011
Downloads: 158
Quote: 0
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Abstract


With China's economic development, transportation substantial growth and accumulation of time, a lot of bridges has a disease carrying capacity decline. Plus a considerable portion of the bridge built in accordance with the original design standards can no longer meet the requirements of normal use, a serious impediment to the development of the transportation of existing roads and bridges. The idea of ??the dangerous bridge demolition and reconstruction of the Old Bridge is neither realistic nor science, the old bridge reinforcement is a very effective way. The external prestressing reinforcement technology is very effective reinforcement method, and it is one of the important branch of the post-tensioned system. The external prestressing reinforcement bridges principle is internal forces generated by the prestressed tendons to offset control section at some or all of the constant, live load internal forces, the essence is to uninstall the cross-section of structure control. Relative to the passive reinforcement method increases the cross-sectional reinforcement method, external prestressing reinforcement beams few body weight increase, but it can substantially improve the adjustment of the original structure of the force, and to improve the bearing capacity and crack resistance of the pier and the basis of the impact very small, while the bridge traffic has little effect, saving maintenance costs. Compared with prestressed structures in the body, externally prestressed structures relatively small reinforcement research is more. This paper summarizes existing reinforcement about the the Bousso way of simply supported and continuous beam bridge, and then from the material, stress analysis, theoretical calculations and construction process of the external cable solid technical research through the introduction of engineering examples. First selection including tendons, anchor blocks and steering blocks three aspects summary, the tendon steel wire strand and coarse reinforced three categories, anchor blocks and steering blocks are divided into two kinds of concrete and steel, should be based on different design using different materials, and to do anti-corrosion measures; describes the current domestic and international research and development of new materials fiber reinforced plastic FRP and Scope. Then reinforced structure stress analysis, summarize the algorithm on the stress increment at home and abroad, on the basis of the existing the specification design theory research, the completion of external prestressing reinforcement technology design theory research, including the estimates of cross section of the tendon prestress loss estimates , mentioning carrier section strength after checking, mentioning contained carrying capacity. The next study the quality control points and considerations on the construction process and provide a reliable basis to ensure the smooth implementation of the External Prestressing. Divided into the anchor block production of materials, construction technology of concrete and steel anchor block two of the most important aspects in the concrete anchor blocks anchorage, an important step in the steel anchor block for high-strength bolts anchoring. Finally, the above summary of material selection, theory research and construction technology applied to several engineering examples and validated by calculating the estimated fair cross-section of the tendon in the research.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge Construction > Bridge maintenance, repair and remediation > Bridge strengthening
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