摘要
为了全面掌握某横穿城市道路段电力隧道结构安全性,在对其进行现场调研与检测的基础上,获取该段电力隧道的病害状况、材料强度、钢筋配置等一系列安全技术指标,并考虑单、双车辆荷载通过该电力隧道上方时的9种可能工况,建立“车辆-道路-电力隧道”三维有限元分析模型。模型计算结果表明:该段电力隧道顶、底板在最不利工况下的弯矩分别为32.44kN·m/m和31.50kN·m/m,隧道边墙在最不利工况下承受的剪力为22.78kN/m,经结构验算后发现电力隧道顶板现状承载力存在明显不足,有着很大的安全隐患。为了解决这一隐患,本文提出采用局部病害修补和框架钢梁加固的综合治理方案,并经有限元建模分析,发现采用该方案加固后电力隧道弯矩比加固前明显降低,降低率达22.13%,可满足电力隧道顶板现状配筋要求,取得了较为良好的加固治理效果。
In order to fully understand the structural safety of a power tunnel crossing the city,On the basis of field investigation and detection,a series of safety technical indexes such as the disease status of the power tunnel,material strength and reinforcement configuration are obtained,The three dimensional finite element analysis model of“vehicle-road-power tunnel”was established by considering nine possible working conditions when single or double vehicle loads passed over the power tunnel.The model calculation results show that:The bending moments of the roof and floor of the power tunnel in this section are respectively 32.44 kN•m/m and 31.50 kN•m/m under the most unfavorable working conditions,the shear force of side wall of the power tunnel under the most unfavorable condition is 22.78 kN/m,Through structural checking calculation,it is found that the bearing capacity of the roof of the power tunnel is obviously insufficient,which has a great safety hidden danger.In order to solve this hidden danger,in this paper,a comprehensive treatment scheme of local damage repair and frame steel beam reinforcement were put forward.Through finite element modeling analysis,it is found that the bending moment of the power tunnel strengthened by this scheme is significantly lower than that before the reinforcement,and the reduction rate is up to 22.13%.It can meet the current reinforcement requirements of power tunnel roof,that is,it has achieved a better reinforcement and management effect.
作者
田岗
TIAN Gang(China Electronic Engineering Design Institute Co.,Ltd.,Beijing 100142,China;C+E Center for Engineering Research Test and Appraisal Co.,Ltd.,Beijing 100142,China)
出处
《工程质量》
2022年第4期26-31,共6页
Construction Quality
关键词
电力隧道
检测
有限元
安全性
加固
power tunnel
detection
finite element
security
reinforcement
