高墩桥梁划分标准

发布时间：2018-03-19 08:20

本文选题：高墩桥　切入点：质量参与系数　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来随着西部大开发战略的实施,国家投入了大量资金和精力用于西部公共交通设施的建设。西部地区由于地形、地貌条件复杂,且多为山地、丘陵。高墩桥梁较其他地区比重大,其中一些高墩桥梁结构较复杂,已超出现有桥梁设计规范的适用范围。国内外学者针对高墩桥的特点也进行了大量研究,并提出了大量切实可行的计算分析,其中广泛得到认可的IDA(增量时程分析)法可以很好的满足高墩桥梁结构设计需求,但却有耗费时间长、操作困难等缺点,且对于大多桥梁也没有必要进行如此精细化的分析工作。这就使得对高墩桥梁提出合适的划分标准变的很有必要。据此从弹性和弹塑性两个阶段展开分析工作,以期可以得到有效,且对工程实际有一定参考价值的理论。具体包含如下几个方面。首先,本文分析了高墩桥梁区别于非高墩桥梁的关键因素：高阶振型对结构地震响应的贡献,即如何有效地表征各阶振型的参与情况成为区分高墩桥与中、低墩桥梁的关键。据此,从结构的两种不同工作状态展开分析工作：弹性阶段、弹塑性阶段。弹性阶段,首先比较了多种可以有效衡量振型参与情况的多种指标,并最终选取质量参与系数作为建立判别标准的指标。并从理论上对质量参与系数的各种影响因素进行了分析,确定了分析模型建立的各种物理参数。进而展开分析工作,对质量参与系数的各种影响因素展开参数分析,并最终得到一阶模态及二阶模态质量参与系数的计算公式,可以使得工程技术人员可以很快的评估各阶振型的参与程度。同时,考虑到质量参与系数本身假设条件的局限性(等反应谱值只反映墩底剪力的各阶贡献),采用反应谱方法对上述的划分标准进行校对。弹塑性阶段,首先对国内外规范的计算方法进行分析(基于一阶振型占主导地位的公式计算法和Pushover方法来确定),本文采用IDA方法与以一阶模态为加载方式的Pushover方法进行对比分析。进而对弹性阶段提出的判定标准进行有效的验证及修订。
[Abstract]:In recent years, with the implementation of the strategy of developing the western region, the state has invested a lot of funds and energy in the construction of public transport facilities in the west. The structure of some high-pier bridges is more complex than that of other regions, which has exceeded the applicable scope of the existing bridge design code. Many scholars at home and abroad have also carried out a lot of research on the characteristics of high-pier bridges. A large number of practical calculation and analysis are put forward, in which IDA (incremental time history analysis) method, which is widely accepted, can meet the design requirements of bridge structure with high piers well, but it has many shortcomings, such as time-consuming and difficult to operate. And for most bridges, it is not necessary to carry out such fine analysis work, which makes it necessary to put forward appropriate dividing standards for high-pier bridges. Based on this, the analysis work is carried out from the two stages of elasticity and elastic-plasticity. In order to get the effective theory, and has certain reference value to the engineering practice. The concrete includes the following several aspects. First of all, In this paper, the key factors that distinguish high-pier bridge from non-high-pier bridge are analyzed: the contribution of high-order modes to structural seismic response, that is, how to effectively characterize the participation of various modes of vibration is the key to distinguish high-pier bridge from medium-low pier bridge. From two different working states of the structure, the analysis is carried out: elastic stage, elastic-plastic stage and elastic stage. First of all, a variety of indexes which can effectively measure the participation of vibration modes are compared. Finally, the quality participation coefficient is selected as the index to establish the criterion, and the influence factors of the quality participation coefficient are analyzed theoretically, the physical parameters of the analysis model are determined, and the analysis work is carried out. The parameter analysis is carried out on the various influencing factors of the mass participation coefficient, and the calculation formulas of the first and second order modal mass participation coefficients are obtained, which enables engineers and technicians to evaluate the participation degree of the various modes quickly. At the same time, Considering the limitation of the hypothetical condition of the mass participation coefficient itself (that the equal response spectrum value only reflects the contribution of each order of the shear force at the pier bottom, the response spectrum method is used to calibrate the above classification criteria in the elastic-plastic stage, First of all, the calculation methods of domestic and foreign norms are analyzed (based on the formula calculation method and Pushover method, which are dominant in the first order mode). In this paper, the IDA method is compared with the Pushover method which uses the first order mode as the loading mode. Then the criterion proposed in the elastic stage is validated and revised effectively.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442

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