缺损钢筋混凝土梁桥模糊可靠性评价模型

吕颖钊; 贺拴海

缺损钢筋混凝土梁桥模糊可靠性评价模型

长安大学桥梁与隧道陕西省重点实验室, 陕西西安 710064

基金项目:

陕西省交通科技项目 03-08K

详细信息

作者简介:
吕颖钊(1978-)，男，浙江湖州人，长安大学博士研究生，从事在役桥梁可靠度研究

中图分类号: U441
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- 文章访问数: 290
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- PDF下载量: 224
- 被引次数: 0
出版历程
- 收稿日期: 2005-07-25
- 刊出日期: 2005-12-25

Fuzzy reliability evaluation of defective RC beam bridge

Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, China

More Information

Author Bio:
Lu Ying-zhao(1978-), male, doctoral student, 86-29-82334837, lyz117@126.com

摘要

摘要: 结合模糊评价理论、层次分析法以及概率可靠度方法, 建立了钢筋混凝土梁桥缺损状况模糊可靠性评价模型。通过建立模糊评价集, 确定项目层、指标层模糊评价因素集和模糊评价因素权重集, 构造概率型判断矩阵, 经加权平均值法计算, 得到梁桥缺损状况模糊评判得分, 以目标可靠指标和最低可靠指标为界, 将模糊评判得分转换为模糊可靠指标, 实现在役梁桥缺损状况的模糊可靠性评价。采用该方法对一座使用25年的多跨简支钢筋混凝土梁桥进行评价, 得到模糊可靠指标为3.769, 满足最低可靠指标要求, 与桥梁实际状况相符, 表明该方法可行。
- 桥梁工程 /
- 缺损状况 /
- 模糊评价 /
- 可靠度 /
- 模糊可靠指标
Abstract: In order to improve the safe evaluation reliability of bridge, a fuzzy reliability evaluation model of defective RC beam bridge was put forward by fuzzy evaluation theory, analytical hierarchy process method and probability method. Through establishing fuzzy evaluation criterion, determining item level factors, index level factors and their weight coefficients, constructing probabilistic matrix of membership degree, the score of fuzzy reliability evaluation of defective RC beam bridge was calculated by weighted average method. The score was switched to fuzzy reliability index by the bounds of target reliability index and lowest reliability index. An existing multi-span RC beam bridge with 25 years was evaluated by the method. Its fuzzy reliability index is 3.769, which accords with the bridge condition. The evaluation result indicates that the method is feasible.
- bridge engineering /
- defective condition /
- fuzzy evaluation /
- reliability /
- fuzzy reliability index

HTML全文

图 1 梁桥缺损状况评价模型

Figure 1. Evaluation model of defective beam bridge

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表 1 一级评判模型因素权重系数

Table 1. Weight coefficients of item level factors

部件i	部件名称	权重(α_i)
1	主梁	0.21
2	横隔板	0.06
3	支座	0.03
4	墩台盖梁	0.15
5	墩台身	0.23
6	墩台基础	0.24
7	地基冲刷	0.08

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表 2 二级评判模型因素权重系数

Table 2. Weight coefficients of index level factors

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表 3 公路桥梁结构的目标可靠指标

Table 3. Target reliability indices of highway bridges

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