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Design method of partially prestressed concrete beam based on crack width(PDF)


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Design method of partially prestressed concrete beam based on crack width
DU Jin-sheng1 LIU Ling1 FENG Wei2 XU Bing2
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Xi'an Highway Research Institute, Xi'an 710054, Shaanxi, China
bridge engineering partially prestressed concrete beam design method crack width reinforcement stress amount of prestressed reinforcement
In order to simplify the design process of partially prestressed concrete(PPC)beam and reduce the number of trial calculation and the range of prestressed reinforcement amount, a design method of partially prestressed concrete(PPC)beam based on crack width was proposed. Starting from the crack width under normal service condition and based on the regulations of crack width in Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTG D62—2004)(Highway Code for short), the stress of non-prestressed reinforcement in tensile region was derived based on the maximum crack width. A cubic equation was established to calculate the neutral axis height of cracking section. Then based on the requirements of effective strain of prestressed reinforcement and the provisions of the minimum reinforcement ratio inHighway Code, the maximum and minimum amounts of prestressed reinforcement were obtained. Key design procedure and a detailed design example were also presented. Furthermore, a T-shaped test girder was designed to verify the design proposed method. Research result shows that the flexural bearing capacity and the maximum and minimum amount of prestressed reinforcement of designed girder can meet the code requirements. The load and deflection of test girder basically show a tri-line relationship. When the external load is 50.0 kN, crack occurs in the midspan of test girder. When the external load is 128.5 kN, the tensile non-prestressed reinforcement yields. When the external load is 157.8 kN, the concrete is broken in the midspan of test girder. The test girder designed by the proposed method exhibits the characteristics of ductile failure and can meet the requirements of bearing performance. The measured maximum crack width of test girder is 0.18 mm before the non-prestressed reinforcement yielding and less than the predicted maximum crack width 0.20 mm, which means that it can meet the requirements of normal use. Obviously, the proposed design method is reasonable and feasible for practical design. It can simplify the design procedure of PPC beam. 9 figs, 25 refs.


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Last Update: 2018-05-20