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Long-Term Effect of Prestress on Self-Anchored Suspension Bridge

Author: WangDan
Tutor: ShenRuiLi
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Self-anchored suspension Concrete Loss of prestress Prestressing equivalent load
CLC: U448.25
Type: Master's thesis
Year: 2008
Downloads: 114
Quote: 0
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Abstract


As the self - anchored suspension bridge , the main cable is anchored in the stiffening beam , install the main cable tensioning slings and bridge deck pavement construction process , stiffening beam will produce elastic deformation , resulting in a new loss of prestress , known as prestressed additional loss . In addition , the stress relaxation of the prestressing tendons and concrete shrinkage creep change will cause the loss of prestressed development with time changes , called prestressed long-term loss . Prestressed additional loss of long-term losses and contraction of the concrete creep will inevitably lead to structural internal force redistribution and linear change , therefore , must be taken into account in the design of the structure the prestressed additional losses , long - term losses as well as shrinkage and creep joint action . The paper briefly set forth the basic principles of prestressed concrete based on the analysis and comparison of prestress loss calculation methods at home and abroad , the use of different time periods and itemized summation method to calculate loss of prestress derivation of prestress loss computer calculation method applicable to , and the preparation of the corresponding computer program ; paper equivalent load method to deal with the role of prestressed structure derived tendon linear prestressing equivalent load applied to computer the method of calculation , and the preparation of the corresponding computer program . Papers , for example, two-span self - anchored suspension bridge with a single tower and a three-span self-anchored suspension application of nonlinear analysis of bridge structures system BNLAS and author preparation prestress analysis program structure prestressed shrinkage and creep effects analysis . The results show that , prestressed concrete shrinkage creep structure is a long process , with the extension of computing time , the structure has been increased , but their rate of change with the extension of the computing time should be determined according to the specific circumstances of the termination of a reasonable calculation time ; prestressed long-term losses to reduce the adverse impact on the structure of the internal forces and linear shrinkage and creep .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Suspension Bridge
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