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On the Design Theory and Method of External Prestressing Concrete Beams

Author: LiangXiaoFei
Tutor: XuYue；WangChunSheng
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: External prestressing Carrying capacity Stress increment Loss of prestress Variational
CLC: U448.35
Type: Master's thesis
Year: 2005
Downloads: 427
Quote: 13
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Abstract


China is in the bridge building another climax , this externally prestressed concrete technology is a rapid application development opportunity . However, the research and application of this new technology is mostly limited to the reinforcement of the existing bridges . From the available information , not enough in - depth study of the mechanical properties of the new reinforced concrete beams in vitro . Papers on the basis of analysis of experimental research data at home and abroad , design specifications and related literature , a more systematic study externally prestressed concrete bridge structures carrying capacity , deformation of the main beam , the principles and methods of calculation of the concrete stress , loss of prestress specific research work as follows : 1. reviews the history and current situation of the development of externally prestressed concrete bridge systematic analysis reviewed existing externally prestressed concrete bridge structure construction features . 2 summarizes the existing formula for the calculation of the stress increment , the main computing prestressed concrete frame limit stress formula detailed analysis . 3 on the basis of the analysis of the research results at home and abroad and a large number of test data , through the cross-section of the internal forces balance equation and deformation compatibility relationship start from overall deformation of the structure , the practical calculation of ultimate bearing capacity of prestressed concrete simple beam calculation vitro derived formula. The special problems of prestressed concrete bridge structures designed from studies in vitro explore the in vitro the prestressing system of prestressed loss calculation method . Use of energy variational principle derived during normal use external tendon stress increment formula . Use force characteristics of the stage , and for externally prestressed beams concrete stress and deformation of the beam is calculated . 6 . Analysis of the factors that affect the durability of externally prestressed concrete bridge , the proposed measures and recommendations to improve the durability .

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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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