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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2025年03期

Page:

115-127

Research Field:

桥梁与隧道工程

Publishing date:

Info

Title:

Nonlinear analysis of prestressed concrete members subjected to bending and torsion

Author(s):

ZHANG Hao¹;  CHEN Yi-yan¹;  ZHOU Jian-jie¹;  DONG Ju-can²;  ZHAO Qiu¹

(1. School of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China; 2. Yunji Intelligent Engineering Co. Ltd., Shenzhen 518000, Guangdong, China)

Keywords:

bridge engineering;  bending-torsion coupling effect;  theoretical model of full range analysis;  prestressed concrete beam;  optimized algorithm

PACS:

U448.35

DOI:

10.19721/j.cnki.1671-8879.2025.03.010

Abstract:

To study the full range performance of prestressed concrete beams under bending-torsion coupling effect, an improved theoretical model of full range analysis in bending-torsion coupling effect was proposed based on the combined action softening truss model(CA-STM). Firstly, according to the bending-torsion coupling force mechanism of prestressed concrete beams, the equilibrium equations, compatibility equations and constitutive relationships satisfying the initial stress-strain relationship caused by prestress were established. Then, the initial torque formulas of hollow and solid sections considering the prestressing effect were introduced based on the previous codes. Additional the equations, the strains and compatibility relations for thin walls were established, and the simplified equivalence methods for steel and prestressing tendons were also proposed. On this basis, the gradient decreasing method was used instead of the traditional trial-and-error method to improve the solution rate and stability, and the solution program for the bending-torsion coupling analysis of prestressed concrete beams was prepared by MATLAB. Finally, the proposed theoretical model was validated by comparing the existing experimental and theoretical results. It can be concluded that the established initial torque equations for hollow and solid sections are in good agreement with the existing test results. The result shows that the cracking and ultimate torque values predicted by the improved model are underestimated without considering the prestressing effect. The improved model accurately predicts the full range torque-twist curves and bending moment-curvature curves of prestressed concrete members subjected to bending-torsion effect. Compared with the traditional trial-and-error method, the proposed optimized algorithm provides a higher solution rate and stability, and its average computation time is only 12 s.3 tabs, 12 figs, 23 refs.

References:

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Memo

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Common functions

Last Update: 2025-05-30