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Analysis and optimization of effect of lining concrete on efficiency of prestressing introduction(PDF)

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

Issue:
2024年2期
Page:
80-88
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Analysis and optimization of effect of lining concrete on efficiency of prestressing introduction
Author(s):
WANG Xiao-ming1;  BAI Yun-teng1;  LU Zhe-yuan2;  HUANG Chun-yang1;  WANG Bing-yu1
(1. Institute of Bridge Engineering, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Yellow River Engineering Consulting Co. Ltd., Zhengzhou 450003, Henan, China)
Keywords:
bridge engineering;  rigid frame bridge with corrugated steel webs;  FEM;  lining concrete;  brace first and then lining construction method;  prestressing introduction efficiency
PACS:
U445
DOI:
10.19721/j.cnki.1671-8879.2024.02.008
Abstract:
Aimed at the problem that the restraint of the lining concrete on the crease effect of the corrugated steel webs will reduce the prestressingefficiency in the supporting area of composite girder bridges with corrugated steel webs. A “brace first and then lining” construction method, which adjusted the construction sequence of liningconcrete, was proposed to improve the prestressing efficiency. An “internal brace and external tension” devicewas proposed for the brace first and then lining construction method to ensure the stability of the corrugatedsteel webs during construction. The formula for calculating the axial stiffness of composite girders withcorrugated steel webs was derived, and the accuracy was verified by an example of simply supported corrugatedsteel web girder. Based on a four-span corrugated steel web prestressed concrete(CSW-PC)continuousrigid-frame bridge, an ANSYS solid finite element model was established to analyze the effect of differentconstruction methods, variations of lining concrete length and thickness on the prestressing efficiency in thesupporting area. And a reasonable construction procedure, length and thickness of lining concrete was suggested. The results show that the lining concrete reduces the crease effect and prestressing efficiency of the corrugated steel webs, and causes a stress concentration in the transition section between the lining and unlininggirder sections. By adopting the brace first and then lining method, the axial stiffness of composite girderswith corrugated steel webs is reduced and the prestressing efficiency is increased. The prestressing efficiency inthe supporting area decreases with the increase of lining concrete's length and thickness. In the actual design, itis recommended that the minimum length of lining concrete should be greater than the height of the girder at thepier, the maximum length should be less than 2.15 times the height of the girder at the support, the maximumthickness should be more than 6% the height of the girder at the support, and the minimum thicknessshould meet the construction requirements.14 figs, 23 refs.

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Last Update: 2024-03-01