Reliability-Based Design and Optimization Method for External Prestressing Reinforcement of Simply-Supported Beams

MA Shibin; LIU Yuezhao; JI Gangsheng; XU Zifei; LIU Zilong

doi:10.13204/j.gyjzG22052104

Volume 52 Issue 10

Oct. 2022

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2022 > 52(10): 168-175,145

Li Qingning, Zhang Pinle, Li Xiaolei. SHEAR LAG EFFECT ANALYSIS OF SHORT PIER SHEAR WALL[J]. INDUSTRIAL CONSTRUCTION, 2011, 41(9): 59-62. doi: 10.13204/j.gyjz201109013

Citation:

MA Shibin, LIU Yuezhao, JI Gangsheng, XU Zifei, LIU Zilong. Reliability-Based Design and Optimization Method for External Prestressing Reinforcement of Simply-Supported Beams[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(10): 168-175,145. doi: 10.13204/j.gyjzG22052104

Li Qingning, Zhang Pinle, Li Xiaolei. SHEAR LAG EFFECT ANALYSIS OF SHORT PIER SHEAR WALL[J]. INDUSTRIAL CONSTRUCTION, 2011, 41(9): 59-62. doi: 10.13204/j.gyjz201109013

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Reliability-Based Design and Optimization Method for External Prestressing Reinforcement of Simply-Supported Beams

doi: 10.13204/j.gyjzG22052104

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Received Date: 2022-05-21
Available Online: 2023-03-22

Abstract

Abstract

In order to scientifically and reasonably study the design optimization of RC simply-supported T-beams with external prestressing reinforcement, a design optimization method for external prestressing reinforcement based on the target reliability was proposed, which fully considered the uncertainty and variability of the geometric design values during the external prestressing deployment. In addition, finite element analysis software was used to calculate the structural reliability of the beams with external prestressing reinforcement based on the six sigma theory, and a response surface method was adopted to analyze the influence of random design variables (equivalent diameter of steel tendon, included angle of steel tendon, fillet radius of steel tendon, bend length of steel tendon, and tensile strength design value of steel strand) on the reliability of the simply-supported T-beams with external prestressing reinforcement. The results show that the reliability of the simply-supported T-beams with external prestressing reinforcement is highly related to the equivalent diameter of the steel tendon with external prestressing reinforcement. In addition, recommended design values for random variables with external prestressing reinforcement were given, which took into account the target reliability indicators for the first level of safety of concrete bridges in use and were verified by an on-site bridge reinforcement project. Furthermore, the span deflection and strain were well controlled in two static load tests, with minimum calibration factors of 0.72 and 0.73, respectively.
- simply-supported T-beam,
- bridge reinforcement,
- external prestressing,
- target reliability,
- design optimization

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References

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