PDF全文阅读

鞠森森 , 钱若霖

 

(陕西工业职业技术大学 数智城市学院 , 咸阳   712000)

摘  要: 为了准确评估火损后桥梁的实际承载能力 , 根据火灾温度值推定混凝土材料的刚度损伤程度 , 引入刚度折减系数对其弹性模量参数进行修正 , 推导出适用于火损桥梁的计算方法 ; 结合有限元仿真模拟和实桥荷载试验结果 , 分别绘制横向分布影响线并计算横向分布系数 , 结果表明 : 针对试验桥梁 , 传统刚性横梁法横向分布系数为 0. 583, 有限元法计算结果为 0. 631, 实桥荷载试验反算结果为 0. 77, 而考虑刚度折减效应后的刚度折减系数内插法和高温后混凝土弹性模量公式法的计算结果分别为 0. 622 和 0. 598, 更接近于有限元仿真和实桥荷载试验结果 。采用考虑刚度折减效应的计算理论值可以更加准确地评估受火损桥梁的承载能力 , 更好地反映桥梁的实际受力情况 , 为有效修复和保养提供科学依据。

关键词: 火损桥梁 ; 刚度折减 ; 荷载试验 ; 横向分布

中图分类号: U443. 3      文献标志码: A      文章编号: 1005-8249 (2026) 05-0115-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 017

 

JU Sensen, QIAN Ruolin

(Digital Intelligence City College, Shaanxi Polytechnic University, Xianyang 712000, China)

Abstract : In order to accurately evaluate the actual bearing capacity of the bridge after fire damage, it is necessary to estimate the degree of stiffness damage of the concrete material based on the fire temperature value, introduce stiffness reduction factors to correct their elastic modulus parameters, and derive a calculation method applicable to fire damaged bridges; Based on the results of finite element simulation and real bridge load test, draw the lateral distribution influence lines and calculate the lateral distribution coefficient. The results showed that for the test bridge, the traditional rigid beam method had a lateral distribution coefficient of 0. 583, the finite element method had a calculation result of 0. 631, and the back calculation result of the real bridge load test was 0. 77.  However, the calculation results of the stiffness reduction coefficient interpolation method considering the stiffness reduction effect and the formula method for the elastic modulus of concrete after high temperature were 0. 622 and 0. 598, respectively, which were closer to the results of finite element simulation and real bridge load test. The use of theoretical values that consider the stiffness reduction effect can more accurately evaluate the bearing capacity of bridges damaged by fire, better reflect the actual stress situation of the bridge, and provide scientific basis for effective repair and maintenance.

Key words: fire damaged bridge; stiffness reduction; load test; lateral distribution

  

 项目来源 : 陕西省教育厅一般专项科学研究计划项目 (23JK0044)。

作者简介 : 鞠森森 (1985—) , 男, 硕士, 讲师, 研究方向 : 防灾减灾工程与防护工程。

收稿日期 : 2024-01-09