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Bridges prestressing reinforcement design evaluation and analysis methods

Author: GuanYanChao
Tutor: HuangQiao
School: Harbin Institute of Technology
Course: Bridge and Tunnel Engineering
Keywords: Bridge Reinforcement Prestressing Limit stress
CLC: U445.72
Type: Master's thesis
Year: 2007
Downloads: 378
Quote: 6
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Abstract


Prestressing technology has simple construction , reliable structure , economic cost , etc., in the new bridge structure is widely used ; while a large number of in-service bridges, as well as steel corrosion overloading and other factors , structural cracks or deformation too large, or because the highway bridge load mentioning level requirements need to be strengthened , the use of external prestressing reinforcement is very effective methods. Based on the existing data externally prestressed concrete beam test , the theoretical analysis on the basis of the existing groups of prestressing tendons ultimate stress simplified formula for confirmatory analysis . Discussion on non- prestressed reinforcement ratio , external prestressing reinforcement ratio , cross- height ratio , concrete strength, as well as methods for loading external tendons ultimate stress increment impact analysis of the steering block , prestressed beam shape and a form of load factors on external tendons secondary effects. Through comparative analysis to identify a set of best agreement with the experimental results of the ultimate stress formula. On this basis, then consider the existing bridge structure design safety factor , the bridge can be used to guide the engineering design of externally prestressed structures . By prestressing reinforcement system mechanical characteristics of the analysis and evaluation of the reinforced system of flexural capacity , diagonal shear capacity, using state of the external tendons stress increment , the use of state of stress and deformation and steering blocks, etc. is calculated , respectively, through the reinforced concrete beams and prestressed concrete beams reinforced numerical example checking . From checking the results, the paper recommended prestressing reinforcement calculation method, an ideal reflection of the beam in the use of external prestressing reinforcement after the force can be applied to practical reinforcement of bridge engineering design . Calculation examples in this article are for the purpose of strengthening capacity can also be used for external prestressing reinforcement method using the function and durability of the structure reinforcement .

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