摘要
钢材和混凝土热工性能差异较大,太阳辐射、气温变化等会导致钢-混组合梁内部产生显著的非均匀温度分布。为研究日照作用下不同桥面构造的铁路钢-混组合梁的温度分布规律,制作一段两端分别为道砟桥面与轨道板桥面、中部无桥面构造的钢-混组合梁试验模型。通过开展夏季晴天环境下的温度试验,分析3种桥面状态下钢-混组合梁的温度分布及变化规律,研究不同桥面钢-混组合梁的日照温度梯度模式。研究结果表明:不同桥面构造的钢-混组合梁日照温度场表现出明显的非均匀性,无桥面的竖向温度梯度日间呈S形,夜间呈反S形;道砟桥面和轨道板桥面的竖向温度梯度十分接近,在钢混界面处发生转折,混凝土顶板内几乎无温差,钢梁内温度梯度呈曲线分布,日间钢梁温度高于混凝土顶板,夜间温度低于混凝土顶板。利用ABAQUS建立不同桥面构造的钢-混组合梁日照温度场数值模型,数值模拟与试验测试温度吻合较好,最大偏差约±1℃。通过对成都地区日照温度场进行模拟,得到了不同桥面构造的铁路钢-混组合梁正、负竖向梯度温度分布模式。成都地区日照温度作用引起无桥面(道砟桥面)和轨道板桥面组合梁栓钉最大剪应力分别为20 MPa和23 MPa,道砟和轨道板桥面组合梁混凝土顶板最大拉应力较小,但无桥面组合梁混凝土顶板最大拉应力达1.121 MPa,工程中应予以重视。
The thermal properties of steel and concrete differ significantly,and factors such as solar radiation and temperature variations can lead to significant non-uniform temperature distributions within steel-concrete composite beams.To investigate the temperature distribution of railway steel-concrete composite beams with different bridge deck structures under solar radiation,a test model was fabricated.This model consisted of a steelconcrete composite beam with a ballasted deck at one end,a track slab deck at the other end,and an uncovered middle section.Temperature experiments were conducted under clear summer conditions to analyze the temperature distribution and variation patterns under the three deck configurations.The study also examined the solar-induced temperature gradient models for these beams.The results indicate that the temperature field of steelconcrete composite beams exhibits significant non-uniformity under different deck structures.For the uncovered section,the vertical temperature gradient follows an S-shaped distribution during the day and an inverted Sshaped distribution at night;the ballasted and track slab deck sections exhibit very similar vertical temperature gradients,with an inflection point at the steel-concrete interface.There is almost no temperature difference within the concrete slab,and the temperature gradient in the steel beam exhibits a curved distribution.The steel web temperature is higher during the day and lower at night than the concrete slab.By using ABAQUS®,the numerical temperature field model of steel-concrete composite beams with different deck structures was established.The simulated temperatures showed satisfactory agreement with experimental measurements,with a maximum deviation of approximately±1℃.By simulating the solar radiation temperature field in the Chengdu area,positive and negative vertical temperature gradient patterns for railway steel-concrete composite beams with different deck structures were obtained.The study found that under solar-induced temperature effects in Chengdu,the maximum shear stresses in shear studs for uncovered(ballasted deck)and track slab deck composite beams are 20 MPa and 23 MPa,respectively.The maximum tensile stress in the concrete slab is relatively small for ballasted and track slab deck beams.However,for the uncovered composite beam,the maximum tensile stress in the concrete slab reaches 1.121 MPa,which requires considerable attention in engineering applications.
作者
杨宇涵
杨永清
黄胜前
谢明志
YANG Yuhan;YANG Yongqing;HUANG Shengqian;XIE Mingzhi(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道科学与工程学报》
北大核心
2025年第10期4575-4586,共12页
Journal of Railway Science and Engineering
基金
国家自然科学基金面上项目(52178169)。
关键词
铁路桥梁
钢-混组合梁
温度场
试验研究
数值模拟
railway bridge
steel-concrete composite beam
temperature field
experimental research
numerical simulation
