飞燕式提篮系杆拱桥极限承载力及地震响应分析  

Analysis of Ultimate Bearing Capacity and Seismic Response of Swallow Arch Bridges

作　　者：郑雨凡 ZHENG Yufan(Fujian Provincial Institute of Architectural Design and Research Co.,Ltd.,Fuzhou 350001)

机构地区：[1]福建省建筑设计研究院有限公司,福建福州350001

出　　处：《福建建筑》2024年第5期136-142,共7页Fujian Architecture & Construction

摘　　要：为进一步完善我国系杆拱桥理论,以某飞燕式提篮系杆拱桥为研究对象,通过Midas Civil,对该桥建立空间有限元模型,分析该桥的动静力结构特性及极限承载力;开展地震荷载下的响应分析;并以边跨拱肋跨径为参数进行了对比分析;同时对拱肋钢混结合段进行实体有限元建模分析。结果表明,成桥运营后,吊杆和系杆都有较大的安全系数;主拱肋全部承受压应力,且均在相应材料的承载能力之内,拱肋变形呈曲线形;三角刚架混凝土段受力满足规范要求;在地震作用下,可满足“中震不坏、大震有限损坏”的抗震设防目标,E1地震反应谱作用下,顺桥向最大响应位移为5.6 mm,竖向响应位移最为6.7 mm;边中跨比为0.246时受力较为合理。文章还提出了钢混结合段面面摩擦接触模拟的方法。In order to further improve the theory of tied arch bridges,a swallow arch bridge is taken as a research object,and a spatial finite element analysis model is established for the bridge by using Midas Civil finite element analysis software to analyze the dynamic and static structural characteristics as well as the ultimate bearing capacity of the bridge.The response analysis is carried out under seismic loading.Comparison analyses were carried out using the span diameter of the side-span arch ribs as a parameter,and finally solid finite element modelling was carried out for the steel-hybrid section of the arch ribs.Results show that,after the bridge is operated,the suspension rods and tie rods have large safety coefficients;The main arch ribs are all subjected to compressive stresses,and they are all within the bearing capacity of the corresponding materials,and the deformation of the arch ribs is in the form of curves;the stresses of the concrete section of the triangular stiffener satisfy the requirements of the specification;and the bridge meets the requirements of the seismic design and protection of the bridge,such as the principle of"moderate quake is not bad,and the large quake has limited damage".Under the seismic action,it meets the seismic defense goal of"no damage in medium earthquake and limited damage in large earthquake",and under the action of E1 seismic response spectrum,the maximum response displacement in the downward direction of the bridge is 5.6mm,and the vertical response displacement is the most 6.7mm.The force is more reasonable when the side-mid span ratio is 0.246.A method for simulating the face-to-face frictional contact of steel-hybrid section is proposed.

关 键 词：飞燕式拱桥 极限承载力 有限元分析 地震响应 

分 类 号：U44[建筑科学—桥梁与隧道工程]