[1]唐思聪,刘金松,张维,等.极端温差地区框架棚洞结构温度效应影响及结构优化研究[J].高速铁路技术,2023,14(02):64-69，74.[doi:10.12098/j.issn.1674-8247.2023.02.013]
　TANG Sicong,LIU Jinsong,ZHANG Wei,et al.A Study on Temperature Effect and Structural Optimization of Frame Shed Tunnel Structure in Extreme Temperature Difference Area[J].HIGH SPEED RAILWAY TECHNOLOGY,2023,14(02):64-69，74.[doi:10.12098/j.issn.1674-8247.2023.02.013]
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极端温差地区框架棚洞结构温度效应影响及结构优化研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
14卷
期数:
2023年02期
页码:
64-69，74
栏目:
出版日期:
2023-04-30

文章信息/Info

Title:
A Study on Temperature Effect and Structural Optimization of Frame Shed Tunnel Structure in Extreme Temperature Difference Area
文章编号:
1674-8247（2023）02-0064-06
作者:
唐思聪; 刘金松; 张维; 罗禄森
中铁二院工程集团有限责任公司，? 成都610031
Author(s):
TANG Sicong; LIU Jinsong; ZHANG Wei; LUO Lusen
China Railway Eryuan Engineering Group Co. ， Ltd. ， Chengdu? 610031 ，China
关键词:
棚洞; 框架; 隧道洞口; 温度荷载
Keywords:
shed tunnel; frame; tunnel portal; temperature load
分类号:
U452.2
DOI:
10.12098/j.issn.1674-8247.2023.02.013
文献标志码:
A
摘要:
本文以拉林铁路达嘎拉隧道进口棚洞为研究对象，研究了外界温度变化对棚洞结构的整体稳定性的影响，分析了温度变化时立柱、纵梁、纵向联系梁及横向联系梁的内力变化，结果表明：（1）棚洞结构的最大变形随着降温及升温幅度的增加而增大，降温对结构变形的影响高于升温；（2）纵梁跨中弯矩受升温25°控制，而纵梁端部弯矩、桩基最大弯矩、纵向联系梁最大弯矩及轴力受降温25°控制；（3）横向联系梁的增加对控制棚洞结构的变形作用并不大；在降温作用下，横向联系梁的增加使桩基端部弯矩增加了约3倍，同时承受巨大的轴向拉力；（4）取消设置横向联系梁，既可以保证棚洞结构的整体稳定性，又可以降低降温引起的附加内力。
Abstract:
This paper took the shed tunnel at the entrance of the Dagala Tunnel of Lhasa–Nyingchi Railway as a case to study the impact of external temperature change on the overall stability of the shed tunnel structure，and analyzed the changes of internal forces of columns，longitudinal beams，longitudinal connecting beams and transverse connecting beams when the temperature changes. The results show that：（1） The maximum deformation of shed tunnel structure increases with the increase of temperature drop／rise，and the impact of the temperature drop on structural deformation is greater than that of temperature rise. （2）The critical temperature change for the midspan bending moment of the longitudinal beam is temperature rise of 25°，while that for the bending moment at the end of the longitudinal beam，the maximum bending moment of the pile foundation，the maximum bending moment of the longitudinal connecting beam and the axial force is temperature drop of 25°. （3） The addition of the transverse connecting beam has little effect on controlling the deformation of the shed tunnel structure. Under the cooling effect，the addition of the transverse connecting beam will increase the bending moment at the end of the pile foundation by about 3 times and bears huge axial tension simultaneously. （4） The removal of transverse connecting beams can ensure the overall stability of the shed tunnel structure and reduce the additional internal force caused by cooling.

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备注/Memo

备注/Memo:
收稿日期：2022-01-10
作者简介：唐思聪（1988-），男，高级工程师。
更新日期/Last Update: 2023-04-30