基于延性的中小跨公路梁桥抗震细化设计研究

发布时间：2018-01-08 22:00

  本文关键词：基于延性的中小跨公路梁桥抗震细化设计研究　出处：《南京工业大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 中小跨公路桥梁 桥梁抗震 墩柱延性 多级性能目标 细化设计 能力保护构件

【摘要】：通过对国内外主要震害的调研发现,墩柱抗剪承载力不足和延性能力不足是造成墩柱破坏的重要原因。确保桥墩在地震作用下具有良好的延性和耗能能力,是实现桥梁结构基于性能抗震设计的重要前提。我国的《公路桥梁抗震设计细则》(JTG/T B02-01-2008)对如何实现延性抗震设计,特别是考虑不同性能要求的延性设计并没有具体规定；对能力保护构件的验算规定得也比较宏观,无法体现桥梁的不同性能要求。因此,很有必要从性能设计的角度,深化和细化桥梁的延性设计。本文采用调研分析、理论计算和数值模拟相结合的方法进行研究。本文的主要成果如下：(1)明确了墩柱延性的评价指标及量化标准。在已有的相关规范及研究成果的基础上,全面了解国内外对于墩柱延性程度的划分及延性指标的量化标准,初步确定延性指标。对位移延性系数、曲率延性系数、位移角三个指标之间的相互关系进行研究,并提出以位移延性系数作为衡量桥梁整体结构的延性水平的指标。(2)提出了中小跨径公路桥梁的多级延性性能水平评价标准。建议将中小跨径公路桥梁的多级性能水平设定为：性能Ⅰ—在E1地震作用下桥梁结构处于弹性状态,在E2地震作用下墩柱出现轻微损伤；性能Ⅱ—在E1地震作用下桥梁结构处于弹性状态,在E2地震作用下墩柱出现可修复损伤；性能Ⅲ-在E1地震作用下桥梁结构处于弹性状态,在E2地震作用下墩柱出现重大损伤,但不倒塌。(3)给出了公路桥梁墩柱受剪承载力计算公式的改进建议。明确了纵桥向和横桥向最不利轴力的确定方法；对墩柱抗剪设计没有考虑墩柱不同延性能力的要求,参考《Caltrans规范》的规定,引入位移延性系数将墩柱的延性要求与墩柱的受剪承载力相联系。(4)系统分析了截面形式混凝土强度、纵筋、箍筋等因素对墩柱延性能力的影响规律,并提出了具体的设计建议。同时就轴力变化对墩柱横桥向的延性能力影响进行了初步研究。(5)明确和细化了基于延性能力、需求相一致的简化设计方法。该简化方法适用于可以简化为单自由度体系的一般规则的中小跨径公路桥梁,可以实现延性能力与延性需求相一致的性能目标。(6)提出了基于多级延性性能目标的设计思路及实现方法,并结合具体典型桥梁提出实现不同延性能力及性能目标的设计方案。针对板桥和组合梁桥,利用Pushover方法,采用基于能力的设计方法,提出满足多种性能能力的设计方案。
[Abstract]:Through the investigation of the main earthquake damage at home and abroad, it is found that the insufficient shear bearing capacity and ductility capacity of the pier column are the important reasons to cause the damage of the pier column, and ensure that the pier has good ductility and energy dissipation ability under the earthquake action. It is an important premise to realize the performance-based seismic design of bridge structure. JTG / T / T B02-01-2008 of our country's "detailed rules for Seismic Design of Highway Bridges" is how to realize the ductile seismic design. In particular, the ductility design considering different performance requirements is not specified; The checking calculation of the capacity protection component is also macroscopical, which can not reflect the different performance requirements of the bridge. Therefore, it is necessary to design from the point of view of performance. To deepen and refine the ductility design of bridges. The main results of this paper are as follows: 1) the evaluation index and quantitative standard of ductility of pier column are defined. Based on the existing related specifications and research results, the main results of this paper are as follows: (1) the main results of this paper are as follows: (1) the evaluation index and quantitative standard of ductility of pier column are defined. Comprehensive understanding of the classification of ductility degree and the quantitative criteria of ductility index at home and abroad, the preliminary determination of ductility index, displacement ductility coefficient, curvature ductility coefficient. The relationship between the three indexes of displacement angle is studied. The displacement ductility coefficient is put forward as the index to measure the ductility level of the whole bridge structure. The evaluation standard of multi-stage ductility performance of medium and small span highway bridges is put forward. It is suggested that the multistage performance level of medium and small span highway bridges should be set as follows: performance 鈪，

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