文档介绍：河北工业大学
硕士学位论文
基于振动的RC梁桥承载力的评估研究
姓名:曹连波
申请学位级别:硕士
专业:结构工程
指导教师:杜青
20081101
河北工业大学硕士学位论文
基于振动的 RC 梁桥承载力的评估研究
摘要
本文围绕如何对桥梁承载力作出评估这一问题,尝试用基于振动的理论来评估 RC 梁
桥的承载能力,运用数值分析方法和试验测试等研究手段,完成了以下工作:
,运用大型通用有限元软件 ADINA 对钢筋混凝土 T 梁进行分
析与计算,得出模型梁从开裂至破坏过程中在不同荷载等级下的挠度、频率值,通过对所
需数据的回归分析,拟合出了静、动刚度比与理论、实测基频比之间的关系方程;
RC 梁桥承载力评估的可行性方法及基本理论;
,得出了结构的动力特性参数,初步修正
了该桥整体结构的弹性模量和密度,并依据实测基频和外观裂缝特征将整桥的动刚度分解
为单个梁的动刚度;
,
所得结论与静载试验一致,验证了本文理论的适用性。
关键词:桥梁,静刚度,动刚度,振动,承载能力
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基于振动的 RC 梁桥承载力的评估研究
STUDY ON THE ASSESSMENT OF BEARING
CAPACITY OF THE RC BRIDGE
BASED ON THE VIBRATION
ABSTRACT
Centering on how to assess the bearing capacity of the bridge, this paper tried to use the
theory of vibration to evaluate the load-carrying capacity of the RC bridge, and finished the
following study work by numerical analysis method and experiment testing and so on.
1. Based on the nonlinear finite element theory, using the large general finite element
software ADINA in the analysis and calculation of the reinforced concrete T-beam, obtained the
T-beam of the value of deflection and frequency under different load lever from cracking to
failure, Through the regression analysis of the necessary date, established the relationship
equation between the static and dynamic stiffness’s ratio and the theoretical and measured
frequency’s ratio,
2. Elucidating the feasible methods and basic theory of the assessment of the bearing
capacity of RC bridge based on the vibration,
3. According to the dynamic test of the cheliuhe RC bridges under the ambient stiffness,
measured the parameters of the structural dynamic characteristics, preliminarily modified the
elastic modulus and density of whole structure of the bridge, and then basis for the measured
frequency and the characteristics parameter of cracks posed the whole bridge’s dynamic
stiffn