桥梁基础抗震简化模拟方法适用性研究

发布时间：2018-11-06 08:30

【摘要】：桥梁基础的安全性设计对桥梁工程的重要性不言而喻。在目前的桥梁设计中,模拟桥梁基础的桩-土相互作用方面的问题,一直是工作中的难点。这也体现了对相关课题研究的必要性。因此,本文选取赣州市章江南大道延伸道路工程中一实例连续梁桥的桩基础作为研究原型,通过有限元分析软件midas/Civil,重点考虑桥梁基础局部结构响应,对我国目前广泛使用的桩基础简化模拟方法“n倍桩径嵌固法”作评估。本着探讨nd嵌固法精确性和适用性的目的,力求能够给工程师在桥梁工程设计工作中提供一定的参考。另外,考虑到场地条件对建筑物的抗震安全性有较大影响,本文提出将规范中场地的划分,作为一项影响因素,加入到桩基础简化模拟方法评估当中。主要完成以下几项工作:(1)大量查阅相关资料后,本文简明地对桥梁桩基础简化模拟的研究发展现状做了综合概述;选择目前我国工程中广泛运用的两种简化模拟方法:n倍桩径嵌固法(nd嵌固法)、“m法”作为研究对象。(2)对场地划分的各项影响因素及评定指标作了简要概述。并结合规范中场地划分的条件,从大量的钻孔资料中,选取了多组不同场地划分的场地剖面作为本文分析工况的场地条件。(3)阐述在midas/Civil中如何实现两种简化模拟方法;同时通过对实例桥梁桩基础的计算分析,与实例桥梁工程计算书中设计值做比对,验证建模方法的可行性。(4)使用验证后的建模方法,对nd嵌固法和m法分别建模:(1)将模型分别在共十数种静力工况下进行计算。选择单桩位移响应作为评估指标,以m法结果为基准,对不同场地条件下,nd嵌固法中的桩径倍数“n”的适宜取值进行探讨。(2)建立桩基础局部模型,在18个动力工况下进行动态时程分析,加入考虑墩台部位的内力及位移响应作为参考指标。同样以m法结果为基准,探讨对不同场地条件下,nd嵌固法中的桩径倍数的适宜取值。研究桥梁基础简化模拟方法在抗震方面适用性。
[Abstract]:The importance of safety design of bridge foundation to bridge engineering is self-evident. In the current bridge design, it is always difficult to simulate the pile-soil interaction of bridge foundation. This also reflects the necessity of research on related topics. Therefore, this paper selects the pile foundation of a continuous beam bridge as the research prototype in the extending road project of Zhangjiangnan Avenue in Ganzhou City. The local structural response of the bridge foundation is mainly considered by the finite element analysis software midas/Civil,. This paper evaluates the simplified simulation method of pile foundation which is widely used in our country. In order to discuss the accuracy and applicability of nd inlay method, this paper tries to provide a certain reference for engineers in bridge engineering design. In addition, considering that site conditions have a great impact on the seismic safety of buildings, this paper proposes to add the division of site in the code as an influential factor to the evaluation of simplified simulation method for pile foundation. The main works are as follows: (1) after consulting a large number of relevant data, this paper makes a comprehensive overview of the research and development of simplified simulation of bridge pile foundation; This paper selects two simplified simulation methods widely used in our country at present: nd method and m method. (2) the influencing factors and evaluation indexes of site division are briefly summarized. Combined with the condition of site division in the code, from a large number of borehole data, the site profiles of different sites are selected as the site conditions in this paper. (3) how to realize two simplified simulation methods in midas/Civil; At the same time, through the calculation and analysis of the bridge pile foundation, the feasibility of the modeling method is verified by comparing it with the design value in the calculation book of the example bridge engineering. (4) using the verified modeling method, The modeling of nd method and m method are as follows: (1) the model is calculated under ten kinds of static conditions. The displacement response of single pile is selected as the evaluation index. Based on the results of m method, the appropriate value of pile diameter multiple "n" in nd method is discussed under different site conditions. (2) the local model of pile foundation is established. The dynamic time history analysis is carried out under 18 dynamic conditions, and the internal force and displacement response of the pier and abutment are considered as the reference index. On the basis of the results of m method, the appropriate value of pile diameter multiple in nd method is discussed under different site conditions. The applicability of simplified simulation method for bridge foundation in earthquake resistance is studied.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U443.1

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