摘要
在桥梁施工过程中,施工方法及预应力钢束张拉的先后顺序对主梁的变形和内力均有较大的影响。本文以某铁路桥(48+80+48)m连续梁为工程背景,通过建立实桥计算模型,对施工过程进行模拟并做详细分析,将结构计算结果与现场实测数据对比分析发现,钢束张拉顺序不当是导致梁体产生较大非正常变形的主要原因。研究结果表明,(1)经过参数修正后的结构计算模型可以准确模拟实际施工工况;(2)钢束张拉顺序错乱会导致梁体产生较大的非正常变形,严重时会导致梁体开裂;(3)通过采取边跨顶升和跨中压重相结合的整治方案,可以使桥梁线形和应力结果达到较为理想的状态。
During bridge construction,the construction methodology and the sequence of prestressed tendon tensioning significantly influence the deformation and internal forces of the main girder.Taking a railway bridge with a(48+80+48)m continuous girder as the case study,this paper established a computational model of the actual bridge to simulate and analyze the construction process in detail.By comparing the structural calculation results with the field-measured data,it was identified that improper tensioning sequence was the primary cause of abnormal girder deformation.The research findings demonstrate that(1)The structural calculation model,after parameter correction,accurately simulates actual construction conditions.(2)Disordered tendon tensioning sequences induce significant abnormal deformation in the girder,potentially leading to cracking under severe circumstances.(3)A remediation strategy combining side-span lifting and mid-span loading effectively optimizes the bridge geometry and stress distribution to an ideal state.
作者
印建文
李帅
马雅林
曹凌飞
吕奇伟
侯勇
YIN Jianwen;LI Shuai;MA Yalin;CAO Lingfei;LV Qiwei;HOU Yong(Chengdu-Lanzhou Railway Co.,Ltd.,Chengdu 610072,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2025年第3期68-73,共6页
High Speed Railway Technology
关键词
铁路连续梁桥
非正常变形
缺陷整治设计
线-轨-桥综合整治法方案
railway continuous girder bridge
abnormal deformation
defect remediation design
integrated alignment-track-bridge remediation plan
