【作者】 张俊杰；

【导师】 郑久建； 郭恩；

【作者基本信息】 燕山大学 ， 建筑与土木工程（专业学位）， 2020， 硕士

【摘要】 斜拉桥是一种用拉索把梁连接到桥塔上的桥梁,由主要承受压力的桥塔、承受弯矩的梁体以及受拉的拉索构成的一种结构体系。斜拉桥依靠其跨越能力强,刚度大,设计造型多样等优点广泛用于桥梁建设中。本文以山东省某大桥为工程背景,运用有限元分析软件MIDAS Civil 2019建立有限元分析模型,对该斜拉桥进行了全面分析、评估。本文围绕该桥主要进行以下几个方面的研究:(1)总结了国内外斜拉桥的发展历史、现状、结构特点,并介绍山东省某大桥的工程背景。(2)对大桥主梁、主塔以及斜拉索进行静力计算分析,根据计算结果验证大桥的静力性能。(3)对大桥进行了特征值分析,求解其自振特性,并结合规范对大桥进行颤振稳定性分析,反应谱分析以及抗震时程分析。(4)对大桥进行屈曲分析,计算桥梁在不同工况下的稳定安全系数。(5)依据该大桥2019年第二季度的监测数据对大桥进行分析,并结合静、动力计算分析评价大桥在结构温度、结构应变、结构变形以及斜拉索索力等方面的安全性能。计算分析表明,该大桥在静动力、稳定性方面均满足设计要求。桥梁监测结果表明,大桥处于安全可控状态。本文可为同类大跨度斜拉桥静动力、稳定分析以及性能监测评估提供参考。更多还原

【Abstract】 Cable-stayed bridge is a kind of bridge that connects the beam to the bridge tower with cables.It is a structural system composed of the bridge tower that mainly bears pressure,the beam body that bears bending moment and the cable that bears tension.Cable-stayed bridges are widely used in bridge construction due to their advantages of strong spanning capacity,large rigidity and various design shapes.Taking a bridge in Shandong province as the engineering background,this paper uses finite element analysis software MIDAS Civil 2019 to establish a finite element analysis model to comprehensively analyze and evaluate the cable-stayed bridge.This paper mainly studies the following aspects around the bridge:(1)This paper summarizes the development history,current situation and structural characteristics of cable-stayed bridges at home and abroad,and introduces the engineering background of a bridge in Shandong province.(2)Static calculation and analysis are carried out on the main girder,main tower and stay cables of the bridge,and the static performance of the bridge is verified according to the calculation results.(3)Eigenvalue analysis of the bridge is carried out to solve its natural vibration characteristics,and flutter stability analysis,response spectrum analysis and time history analysis are carried out in combination with the code.(4)Buckling analysis of the bridge is carried out to calculate the stability safety factor of the bridge under different working conditions.(5)According to the monitoring data of the bridge in the second quarter of 2019,the bridge is analyzed,and the safety performance of the bridge in structural temperature,structural strain,structural deformation,cable-stayed force and other aspects is evaluated by combining static and dynamic calculation analysis.Calculation and analysis show that the bridge meets the design requirements in static,dynamic and stability.The bridge monitoring results show that the bridge is in a safe and controllable state.This paper can provide reference for static and dynamic analysis,stability analysis and performance monitoring evaluation of similar long-span cable-stayed bridges.更多还原