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Large span prestressed concrete continuous rigid frame bridge shrinkage , creep effect research

Author: YinLiang
Tutor: LiuLaiJun
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: PC continuous rigid frame bridge Shrink Creep Construction Control
CLC: U448.35
Type: Master's thesis
Year: 2007
Downloads: 196
Quote: 2
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Abstract


Large span prestressed concrete bridge structure shrinkage and creep under great internal forces , will reduce the crack resistance of the cross-section , and may crack , serious impact on the safety and durability of the bridge . Must be fully considered in the design and construction of its impact . Based on own research focuses on the analysis of concrete creep and shrinkage effects . Combination calculated to compare the similarities and differences between old and new specifications for creep coefficient and shrinkage strain . The calculation method is will age adjusted effective modulus instead of the elastic modulus of concrete to consider concrete shrinkage and creep , and combined with the finite element wears finite element gradually calculations , the method is able to simulate large - span prestressed concrete bridge shrinkage and creep of the development process , can be used in different shrinkage and creep model to analyze the structure . Henan Gongyi emerging road stone river channel seven -span prestressed continuous rigid frame bridge engineering examples for civil engineering structures , structural analysis and optimization design software MIDAS / Civil , new specification of highway bridges and culverts (JTGD62-2004) as well as the original highway reinforced concrete and pre-stressed concrete bridge design specification ( JTJ023 -85 ) , using the above method to analyze the impact of internal forces and deformation of the main bridge shrinkage and creep , and the results compared with the measured values ??. Come to shrinkage and creep under different norms calculated with the relationship between the actual deflection and continuous currently by results analysis shows - shrinkage and creep of concrete for long span continuous rigid frame bridge box structure of the upper and lower edge of the stress of the impact of the law ; just build a solution to the problem that made ??the stress monitoring results generally larger . The results of this paper is basically consistent with the measured values ??, the method of this study has some practical and valuable .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridges: the material points > Prestressed concrete bridge
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