大跨度系杆拱桥一阶面内振型对称性判别条件研究  

Conditions for Symmetry in Vertical Plane of the First Vibration Mode Shape for Tied Arch Bridges

作　　者：周仁相[1] 吴定俊[1] 李奇[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2013年第1期100-104,共5页Structural Engineers

摘　　要：系杆拱桥一阶面内振型分别为正对称和反对称时,其对应的动力特性和车致动力响应具有较大差别。根据拱桥一阶面内振型形态将系杆拱桥划分为两类:以主梁正对称振型为主的强梁弱拱和以主拱反对称振型为主的强拱弱梁。选取矢跨比、主拱长细比、梁拱刚度比、跨度等主要参数,利用有限元软件ANSYS进行参数分析,从而给出系杆拱桥一阶面内振型形态对称性近似判别条件。Dynamic characteristics and responses are quite different when tied arch bridges show different mode shapes （symmetric and antisymmetric） in vertical plane for the first vibration mode. In this paper, we define two types of tied arch bridge by the first vibration mode shape： （ 1 ） strong beam weak arch, which mainly has symmetric vibration mode shape of the beam; （2） strong arch weak beam, which has mainly antisymmetric vibration mode shape of the arch. Considering different parameters such as the rise span ratio, rigid ratio between beam and arch, bridge span, extensive analyses were performed by using ANSYS. Conditions for symmetrical mode shape in the vertical plan for the first vibration mode of the tired arch bridges were provided.

关 键 词：系杆拱桥 一阶面内振型 正对称 反对称 强梁弱拱 强拱弱梁 

分 类 号：U448.225[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]