铁路独塔斜拉桥结构温度效应分析  

Analysis of Temperature Effect on Railway Single Tower Cable-stayed Bridge Structure

作　　者：王海涵 彭琦 梁金宝 WANG Hai-han;PENG Qi;LIANG Jin-bao(China Railway Guangzhou Group Co.,Ltd.;China Railway Siyuan Survey and Design Group Co.,Ltd.)

机构地区：[1]中国铁路广州局集团有限公司 [2]中铁第四勘察设计院集团有限公司

出　　处：《中国标准化》2024年第22期215-218,284,共5页China Standardization

基　　金：中国铁路广州局集团有限公司科技研究开发计划课题(项目编号:2022K055-Z);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(项目编号:KY2023014S)资助。

摘　　要：为研究大跨铁路独塔斜拉桥温度作用对桥梁结构的影响,本文以广汕客专跨深汕西高速大桥为工程背景,开展主桥温度效应的现场监测试验研究。结果表明:主梁外侧腹板位置温度变化明显,受太阳照射影响日温差达到18.13℃,且主梁温度传递具有滞后性;结构应变及支座位移与结构温度相关性较强,主梁应变最小为14.65με,最大为63.04με,支座位移最大为11.24 mm,最小为4.43 mm;设计温度荷载包络情况下,主梁跨中截面钢梁上缘最大应力为18.4 MPa,最小应力为-26.7 MPa,主梁纵向最大伸缩为39.1 mm,现场实测值远小于设计计算值,主桥运营期状态指标在安全范围内,分析结果可供类似大跨铁路桥梁设计和标准化施工提供参考。In order to study the influence of temperature on the structure of a large-span railway single tower cablestayed bridge,this paper takes the Guangshan Passenger Dedicated Line Crossing Shenshan West Expressway Bridge as the engineering background and conducts on-site monitoring experiments on the temperature effect of the main bridge.The results show that the temperature change at the outer web plate position of the main beam is significant,and the daily temperature difference under the influence of solar radiation reaches 18.13℃,and the temperature transfer of the main beam has hysteresis.The correlation between structural strain and support displacement and structural temperature is strong.The minimum strain of the main beam is 14.65με,the maximum is 63.04με,and the maximum support displacement is 11.24 mm,the minimum is 4.43 mm.Under the designed temperature load envelope,the maximum stress on the upper edge of the steel beam in the mid span section of the main beam is 18.4 MPa,and the minimum stress is-26.7 MPa.The maximum longitudinal expansion and contraction of the main beam is 39.1 mm,and the measured value on site is much smaller than the design calculation value.The operational status indicators of the main bridge are within the safe range.The analysis results can provide reference for the design and standardized construction of similar large-span railway bridges.

关 键 词：大跨铁路 斜拉桥 温度效应 试验研究 

分 类 号：U441.5[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]