在役RC桥梁的可靠度分析与剩余寿命研究
发布时间：2019-01-06 05:38
【摘要】：桥梁作为交通枢纽性工程,其在公路、铁路工程中占据关键的地位。随着钢筋混凝土桥梁地兴建,它在运营过程中受材料性能、受力荷载、环境因素的影响,其结构承载能力随时间发展而逐渐降低,当降低到极限值时可能会发生桥梁坍塌事故。因此,为了确保桥梁结构运营的安全,对其可靠性研究具有非常重要的意义。本文在国内外可靠度研究的基础上,介绍了桥梁结构可靠度、使用寿命概念,分析了新建、在役RC桥梁使用寿命、剩余寿命的研究方法,并采用蒙特卡罗法进行在役桥梁可靠度分析,主要完成了以下几项工作:1.分析了在役钢筋混凝土桥梁在环境作用下的混凝土碳化、钢筋锈蚀等耐久性损失过程,研究了混凝土抗压强度、混凝土弹性模量、钢筋强度等时变抗力模型,并分析了不同规范中作用在桥梁上的车辆荷载值以及横纵分布位置,为准确分析在役钢筋混凝土桥梁时变可靠度提供了数据支撑;2.介绍了ANSYS中的PDS分析模块,并以钢筋混凝土梁为实例,以ANSYS分离式模型在不同荷载下的挠度值与试验值相近,验证了ANSYS有限元模拟的准确性以及ANSYS分析钢筋混凝土梁可靠度的可行性;3.以某在役RC桥梁为工程背景,在对该桥梁进行外观和无损检测的基础上得出T梁钢筋锈蚀、混凝土碳化、混凝土抗压强度等基本状态,并以T梁活载、恒载、混凝土抗压强度、混凝土弹性模量、钢筋截面积、钢筋抗拉强度等为随机变量在T梁刚度和强度为判断准则下进行时变可靠度分析,从而得出不同时间桥梁的可靠度,并预测出该桥的使用寿命与剩余寿命。
[Abstract]:As a transportation hub, bridge plays a key role in highway and railway engineering. With the construction of reinforced concrete bridge, the bearing capacity of reinforced concrete bridge decreases gradually with the development of time, and the bridge collapse accident may occur when it is reduced to the limit value. Therefore, in order to ensure the safety of bridge structure operation, it is of great significance to study its reliability. Based on the research of reliability at home and abroad, this paper introduces the concept of reliability and service life of bridge structure, and analyzes the research methods of service life and residual life of newly built and existing RC bridges. Monte Carlo method is used to analyze the reliability of existing bridges. The main works are as follows: 1. The durability loss processes of existing reinforced concrete bridges such as carbonation and corrosion of steel bars are analyzed. The time-varying resistance models such as compressive strength of concrete, elastic modulus of concrete and strength of steel bar are studied. The vehicle load value and the transverse and longitudinal distribution position of the bridge acting in different codes are analyzed, which provides the data support for the accurate analysis of time-varying reliability of the existing reinforced concrete bridge. 2. The PDS analysis module in ANSYS is introduced. Taking reinforced concrete beam as an example, the deflection value of ANSYS separation model under different loads is close to the experimental value. The accuracy of ANSYS finite element simulation and the feasibility of ANSYS to analyze the reliability of reinforced concrete beams are verified. 3. Taking a RC bridge in service as the engineering background, on the basis of the appearance and nondestructive testing of the bridge, the basic states of T beam steel bar corrosion, concrete carbonization and concrete compressive strength are obtained, and the T beam live load, dead load, concrete compressive strength, etc. Under the criterion of T beam stiffness and strength, the time-varying reliability analysis of concrete elastic modulus, section area and tensile strength of steel bar is carried out, and the reliability of bridges at different times is obtained. The service life and remaining life of the bridge are predicted.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.7;U448.34
本文编号：2402412
[Abstract]:As a transportation hub, bridge plays a key role in highway and railway engineering. With the construction of reinforced concrete bridge, the bearing capacity of reinforced concrete bridge decreases gradually with the development of time, and the bridge collapse accident may occur when it is reduced to the limit value. Therefore, in order to ensure the safety of bridge structure operation, it is of great significance to study its reliability. Based on the research of reliability at home and abroad, this paper introduces the concept of reliability and service life of bridge structure, and analyzes the research methods of service life and residual life of newly built and existing RC bridges. Monte Carlo method is used to analyze the reliability of existing bridges. The main works are as follows: 1. The durability loss processes of existing reinforced concrete bridges such as carbonation and corrosion of steel bars are analyzed. The time-varying resistance models such as compressive strength of concrete, elastic modulus of concrete and strength of steel bar are studied. The vehicle load value and the transverse and longitudinal distribution position of the bridge acting in different codes are analyzed, which provides the data support for the accurate analysis of time-varying reliability of the existing reinforced concrete bridge. 2. The PDS analysis module in ANSYS is introduced. Taking reinforced concrete beam as an example, the deflection value of ANSYS separation model under different loads is close to the experimental value. The accuracy of ANSYS finite element simulation and the feasibility of ANSYS to analyze the reliability of reinforced concrete beams are verified. 3. Taking a RC bridge in service as the engineering background, on the basis of the appearance and nondestructive testing of the bridge, the basic states of T beam steel bar corrosion, concrete carbonization and concrete compressive strength are obtained, and the T beam live load, dead load, concrete compressive strength, etc. Under the criterion of T beam stiffness and strength, the time-varying reliability analysis of concrete elastic modulus, section area and tensile strength of steel bar is carried out, and the reliability of bridges at different times is obtained. The service life and remaining life of the bridge are predicted.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.7;U448.34
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