中国标准化Issue(12)：189-193,5.DOI:10.3969/j.issn.1002-5944.2024.12.033
大跨铁路斜拉桥组合梁温度标准化监测及作用规律研究
Research on Standardized Monitoring and Law of Action of Temperature for Large-span Railway Cable-stayed Bridge Composite Beam
摘要
Abstract
In order to study the effect of temperature on the structure of a large-span railway cable-stayed bridge composite beam,this paper relies on the construction of a large-span railway cable-stayed bridge project on the Shanghai Su Hu Intercity Railway to conduct on-site monitoring experiments on the temperature distribution law of the main bridge composite beam,and analyze the temperature transfer law of the large-span railway cable-stayed bridge composite beam.The results show that the composite beam reaches the minimum negative temperature gradient at 7:00 and the maximum positive temperature gradient at 15:00,with obvious heat conduction pattern within a range of 400 mm from the top surface of the bridge deck;The lateral temperature gradient of the composite beam changes dramatically in the position of the steel nozzle affected by solar radiation,and the amplitude of the lateral temperature change in the double-sided box is uniform;The use of exponential form for fitting the vertical temperature gradient has a good effect and can provide reference for the design and standardized construction of similar large-span railway bridges;Under the action of positive temperature gradient,the vertical arch at the mid span of the composite beam is 4.76 mm,and the maximum pressure at the upper edge of the concrete slab is-3.5 MPa;Under the action of negative gradient,the vertical deflection at the mid span is-2.1 mm,and the maximum pressure at the upper edge of the concrete slab is 1.5 MPa.关键词
大跨铁路/组合梁/温度作用/试验研究Key words
large-span railway/composite beams/temperature effect/experimental research引用本文复制引用
梁金宝..大跨铁路斜拉桥组合梁温度标准化监测及作用规律研究[J].中国标准化,2024,(12):189-193,5.基金项目
本文受中铁第四勘察设计院集团有限公司科技研究开发计划课题"高速铁路大跨度桥梁桥轨一体化监测体系及行车安全研究"(项目编号:KY2023014S)资助. （项目编号:KY2023014S）
