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

CFRP prestressing tendons stiffness of reinforced concrete beams Study

Author YuGuoYu
Tutor YuTianLai
School Northeast Forestry University
Course Bridge and Tunnel Engineering
Keywords CFRP tendons Prestressing Reinforcement Stiffness
CLC U445.72
Type Master's thesis
Year 2011
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With the social development , the majority of the old bridge can not meet the increasing traffic demand , there are varying degrees of damage , affecting the normal performance , it takes an appropriate reinforcement of measures to enhance the applicability of the bridge , the bridge increases useful lives, to meet the needs of social development . Prestressing reinforcement method technology is one of many ways the most effective methods of reinforcement , reinforcement and other methods, which is an active reinforcement method , CFRP ( carbon fiber reinforced plastic composite ) rib reinforcement technology into full play the CFRP reinforced material material advantages, the field is expected to reinforce the bridge wide range of applications . Currently, externally prestressed concrete beam stiffness under normal use checking There are two main ways, first refer to \consider externally prestressed reinforced concrete beams secondary effects derived theoretical formula . In this paper, external prestressing CFRP tendons reinforced concrete beams experiment to study the concrete strength , the original beam reinforcement ratio , external prestressing beam bending angle , the degree of damage and load levels on the stiffness of reinforced concrete beams . By studying the following conclusions : With the original beam reinforcement to improve , CFRP prestressing tendons reinforced concrete beam stiffness increases, after yielding the original steel beams , this law is more obvious ; generally improved with concrete grade , strengthened beam stiffness has increased to some extent ; with the degree of damage and the original beams with load level increases, the strengthened beam span deflection increases, the stiffness decreases ; CFRP tendons bend angle less than 10 ° , in during normal use of the vertical stiffness of the beam is not significant . Looking at the results from the calculation , consider the secondary effects of the calculation results more accurate results than the norms settled , and this is taken into account in the calculation of the original beam damage with cracks after reinforcement stiffness reduction , the calculated results and experimental results closer and with a certain safety margin , research on CFRP prestressing tendons reinforcement technology has a certain reference.

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