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Research of the Influence of the Frame’s Constrain to the Prestress

Author: SuoQingHui
Tutor: ZhaoShiChun
School: Southwest Jiaotong University
Course: Structural Engineering
Keywords: Prestressed Creep Shrink Finite element method
CLC: TU378.4
Type: Master's thesis
Year: 2002
Downloads: 109
Quote: 6
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Abstract


Due to the increasingly wide application of prestressed concrete , prestressed in different structural forms due to the requirements of the building function , the structure of the local span prestressed form , non-prestressed part of prestressed established the issues to be considered in the design . Established three - story building partially prestressed framework discussed to establish the impact of non-prestressed framework of prestressed and non- prestressed frame part of prestressed long-term loss of interaction of prestressed . The prestressed beam cross-sectional dimension in order to study , in the framework of the reinforcement ratio of the prestressing tendons , shape and tension control stress are the same . Applied finite element program ANSYS framework for simulation, modeling , concrete program DP material . Calculated as follows : To establish a framework for the structural model of prestress equivalent loads applied to the structure , the process simulation prestressed reinforced external load is applied , the structure is in the state . Calculate the long-term loss of prestressed concrete closing , reduced creep and reinforced relaxation caused by the loss of prestress were calculated prestress loss changes over time in the tension 1,60,180 effective prestress , effective prestress equivalent load applied to the frame, and the frame in normal use state of constant live load plus . Three load steps simulation framework normal use. Analysis and calculation , we can draw the following conclusions: (1 ) the constraints of the framework to establish the impact of prestressed should be considered in the design . Especially when constraint is larger role , will result in a large loss of prestress . ( 2 ) the D value of the method can use the framework Calculation Approximate estimated prestressing losses . (3) development over time , each structure prestressed decreasing trend , with the constraint stiffness increases , the structure prestressed decreasing trend increases .

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Prestressed Concrete Structure > Frame
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