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Interval method based safety assessment of bridges

Author: QiangChangXu
Tutor: LiuZhiWen
School: Hunan University
Course: Bridge and Tunnel Engineering
Keywords: Bridge structure Security Assessment Interval Finite Element Parameter uncertainty VC
CLC: U447
Type: Master's thesis
Year: 2010
Downloads: 130
Quote: 2
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Abstract

Bridge structure design criteria is \Therefore, in bridge structures throughout the life cycle, how to ensure the safety of the bridge structure is home to most bridge engineers concern. Foreign countries such as the United States, Japan, after World War II building a large bridge construction bridge structure more in 60 years or so, due to structural aging, load change and natural factors such as the role of these bridges is inevitable to conduct safety assessments, in order to ensure the safety of the bridge structure. Domestic fifties of the twentieth century after the construction of many bridges in the bridge construction had largely been about 60 years, due to structural aging, load level is low, and the role of natural factors such as the need for safety assessment. In the eighties the bridge after bridge construction has reached age 20-30 years or so, during the construction of the bridge design load though higher level to meet the basic requirements of the load now, but the construction quality of this part of the bridge is a major security issue factors, but also an urgent need for a reasonable and effective safety assessment. Therefore, how to establish a reasonable, effective bridge structural safety assessment methods have become the bridge structural engineering research hotspot issues. Bridge structure safety assessment will inevitably have to deal with structural parameters, load parameters uncertainty. How to consider the uncertainty of these parameters on the structural safety of the bridge, the bridge structure safety assessment is the key issue lies. This article has been extensive research literature on the consolidated basis, using interval decomposition, EBE unit discrete technology, penalty function method, the delay coordinate transformation and symbolic manipulation, etc., derived interval method based finite element structural stiffness matrix integration and range of structural equation solving, and the use of object-oriented programming language developed VC corresponding structural safety assessment software, through numerical example the correctness and effectiveness of this program, on this basis, on more than one prestressed simply supported beam bridge considering the security type parameter uncertainty assessment. The main contents are as follows: The first chapter briefly describes the security of domestic and international status of the bridge structure, and the structure of the existing assessment methods for bridges are classified brief assessment of each method principle and merits. The second chapter elaborates interval mathematics algorithms and interval mathematics combined with the finite element theory, the focus range is deduced the structure of the finite element stiffness matrix integration and interval equations. The third chapter briefly introduces the idea of ??object-oriented programming to elaborate each interval finite element base class definition and implementation of methods developed based interval finite element structural analysis program. Chapter IV developed in this paper based on interval finite element structural analysis program to perform detailed validation. Consider loads, materials and geometric parameters of uncertainty, respectively, three-span continuous beam structure, frame structure of two structural analysis model with ANSYS Carlo simulation results were compared with existing literature, as well as validation of the proposed method The validity and effectiveness of the development process. Chapter V over one prestressed simply supported beam bridge interval method based bridge safety assessment, a detailed method based on interval Bridge Safety Evaluation of the basic processes.

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