摘要
综合管廊各类特殊节点由于结构形式不规则且存在大开孔情况,受力分析及设计均较为复杂。本文以管廊各类节点中受力最不利之一的燃气舱吊装口的受力及结构加强入手进行分析研究,探索吊装口较合理的新型加强方式采用Midas Gen软件建立了管廊燃气舱吊装口三维有限元分析模型,研究了不同覆土荷载及不同纵向吊装口长度下管廊外壁的弯矩大小以及挑板、上翻梁两种吊装口加强措施对结构的加强效果研究表明:吊装口开洞对管廊整体性有削弱,会导致管廊配筋率加大;当3m覆土厚度时吊装口长度超过12m以及5m覆土厚度时吊装口长度超过10m,管廊裂缝控制配筋率超过0.8%的合理限制;挑板以及上翻梁均为有效的加强措施,使得管廊在不改变截面厚度情况下保持合理的配筋率和变形,并减少钢筋的用量,节省工程量。
Due to the irregular structure and large opening of various special nodes in the utility tunnel,the mechanical analysis and design are complicated Analysis and research on the stress and structural strengthening of the hoisting opening of gas tank were carried out in this paper,and the new reasonable mode of the hoisting opening we re studied.Midas Gen software was used to establish a three-dimensional finite element analysis model of the hoisting opening of the gas tank in the utility tunnel.The bending moment of the outer wall of the utility tunnel under different overburden load and different longitudinal lifting port length were studied.and the strengthening effect of two hoisting opening strengthening measures on the structure were analyzed.The results showed that:the opening size of the hoisting opening weakened the integrity of the tunnel,and led to the increase of the reinforcement ratio of the utility tunnel.The reinforcement ratio of utility tunnel exceeded the reasonable limit of 0.8%,when the length of hoisting opening exceeded 12 m(the soil thickness of covering soil was 3 m)or 10 m(the soil thickness was 5 m).The cantilever slab and upturned beam were effective strengthening measures,which could maintain reasonable reinforcement ratio and deformation without changing section thickness of utility tunnel,reduce the amount of steel bar and save the amount of engineering work.
作者
尹克明
张桦
牛犇
林雪斌
Yin Keming;Zhang Hua;Niu Ben;Lin Xuebin(Southwest Municipal Engineering Design&Research Institute of China,Chengdu 610081,China)
出处
《特种结构》
2020年第1期1-6,共6页
Special Structures
关键词
综合管廊
吊装口
加强措施
挑板
上翻梁
Utility tunnel
Hoisting opening
Strengthening measure
Cantilever slab
Upturned beam
