Fuzzy comprehensive evaluation of urban bridge reliability based on combination weighting method

doi:10.16265/j.cnki.issn1003-3033.2023.S1.2494

Abstract

Abstract:

In order to evaluate the reliability of urban bridges and prevent safety accidents of bridges, the multi-standard and multi-factor requirements of urban bridge evaluation and the complexity and fuzziness of the evaluation system were considered. A comprehensive evaluation index system for bridge structure reliability was established according to the structural characteristics and code requirements of urban bridges. An improved AHP was adopted to construct a judgment matrix through the 1-9 scale method and the natural index scale method, so as to determine the subjective weights of indexes at all levels of the evaluation system. The objective weights of indexes at all levels were determined through the EWM, and the indexes were empowered by combining the above two methods. The fuzzy theory was introduced, and the Cauchy distribution membership function was selected and corrected based on the characteristics of bridge structure engineering. Then the membership matrix values of the indexes at all levels were calculated. The index system and calculation method were validated in real bridge structure engineering. The results show that combining industry codes and expert experience to establish an evaluation index system, using an improved AHP based on the existing research, and introducing fuzzy theory can enhance the objectivity and accuracy of bridge reliability evaluation.

Key words: combination weighting method, urban bridge, fuzzy comprehensive evaluation, analytic hierarchy process (AHP), entropy weight method (EWM)

ZHOU Haiyi, BAO Quangui, YE Mao, ZHU Shengwen, LIN Yingdian. Fuzzy comprehensive evaluation of urban bridge reliability based on combination weighting method[J]. China Safety Science Journal, 2023, 33(S1): 156-161.

Figures/Tables 4

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一级指标	二级指标	主要指标	标准特征值
一级指标	二级指标	主要指标	健康	亚健康	病变	危情
B₁	C₁₁	跨中挠度	无明显变形	≤1/1 000	1/1 000	承重结构
	C₁₂	沿支座一侧外鼓长度/ 相应边长/%	无外鼓或串动	≤10	10~25	>25
	C₁₃	裂缝缝长	钢筋完好,无裂缝	≤1/3	1/3~2/3	>2/3
	C₁₄	凹凸不平差值/cm	无凹凸不平且无破损	≤1	1~3	>3
	C₁₅	缺陷设施/总设施数量/%	泄水管、引水槽无缺陷	≤5	5~8	>8
	C₁₆	损坏长度/总长度/%	无撞坏、缺失	≤3	3~10	>10
B₂	C₂₁	冲蚀累计面积/构件面积/%	基础无冲蚀	≤3	3~10	>10
	C₂₂	露筋单处面积/m²	基础无露筋	≤0. 25	0.25~1.0	>1.0
	C₂₃	裂缝缝长	基础无裂缝	≤1/3	1/3~1/2	>1/2
B₃	C₃₁	年平均大风级数与天数	6级以上<10	6级以上<15	6级以上≥15	8级以上≥20
	C₃₂	桥梁所处环境	一般环境	干湿交替、尾气严重	轻度盐雾区、酸雨作用	重度盐雾、盐结晶
	C₃₃	冻结温度/℃	低于-15	-11~-15	-7~-11	-3~-7
	C₃₄	年能见度距离及天数	500 m以下<4	500 m以下<6	500 m以下≥6	200 m以下≥8
B₄	C₄₁	过桥车辆设计车速/(km·h^-1)	≤40	40~60	60~80	≥60
	C₄₂	超载率	1.2	1.5	1.8	≥2
	C₄₃	河流流速/(m·s^-1)	≤1.5	1.5~3	3~5	≥5
	C₄₄	抗爆设防等级	4级	3级	2级	低于2级
B₅	C₅₁	单跨跨径/m	5~20	20~40	40~150	>150
B₅	C₅₂	桥梁类别	一类桥	二类桥	三类桥	四类桥及以上
B₆	C₆₁	巡检次数	每季度巡检一次	一季度至半年巡检一次	半年至一年巡检一次	一年以上巡检一次
	C₆₂	管理报告及多层级多领域人员结构	全部满足	大多满足	一半满足	较少满足
	C₆₃	安全观测设施和流程	整体完备	较为完备	基本完备	部分缺失

鉴定项目	指标	评分条件	得分
B₁	C₁₁	梁体无明显变形,结构无明显位移	85
	C₁₂	支座完好	90
	C₁₃	钢筋有锈蚀现象,较少裂缝,缝宽未超限	70
	C₁₄	略有凹凸不平,锚固构件松动	75
	C₁₅	局部排水不畅,桥下出现漏水现象	67
	C₁₆	局部构件脱落、缺失,不影响功能	70
B₂	C₂₁	基础无冲蚀	85
	C₂₂	承台出现少量剥落、露筋、锈蚀现象	82
	C₂₃	结构应力异常,出现剪切裂缝, 缝宽未超限	83
B₃	C₃₁	年平均出现6级以上大风天数<15 d	86
	C₃₂	一般环境	90
	C₃₃	冻结温度范围在低于-15 ℃	90
	C₃₄	年能见度<500 m的雾天数<6 d	92
B₄	C₄₁	车辆过桥的设计车速<60 km/h	75
	C₄₂	超载率为1.5	67
	C₄₃	流速≥3 m/s且<5 m/s	78
	C₄₄	抗爆设防等级为4级	85
B₅	C₅₁	二类桥,抗爆设防等级为4级	85
B₅	C₅₂	大桥,总长100 m≤L≤1 000 m	90
B₆	C₆₁	一季度巡检一次,并形成巡检报告	87
	C₆₂	有书面化的管理制度及多层级多领域的人员配置	85
	C₆₃	有完备的安全观测设施和流程	83

指标项	专家评分	等级1	等级2	等级3	等级4
C₁₁	85	0.800 0	0.307 7	0.075 5	0.086 5
C₁₂	90	1.000 0	0.200 0	0.058 8	0.075 5
C₁₃	70	0.200 0	1.000 0	0.200 0	0.137 9
C₁₄	75	0.307 7	0.800 0	0.137 9	0.116 8
C₁₅	67	0.159 0	0.917 4	0.257 1	0.153 3
C₁₆	70	0.200 0	1.000 0	0.200 0	0.137 9
C₂₁	85	0.800 0	0.307 7	0.075 5	0.086 5
C₂₂	82	0.609 8	0.409 8	0.089 0	0.094 3
C₂₃	83	0.671 1	0.371 7	0.084 1	0.091 6
C₃₁	86	0.862 1	0.280 9	0.071 6	0.084 1
C₃₂	90	1.000 0	0.200 0	0.058 8	0.075 5
C₃₃	90	1.000 0	0.200 0	0.058 8	0.075 5
C₃₄	92	0.961 5	0.171 2	0.053 6	0.071 6
C₄₁	75	0.307 7	0.800 0	0.137 9	0.116 8
C₄₂	70	0.200 0	1.000 0	0.200 0	0.137 9
C₄₃	67	0.159 0	0.917 4	0.257 1	0.153 3
C₄₄	78	0.409 8	0.609 8	0.113 1	0.106 3
C₅₁	85	0.800 0	0.307 7	0.075 5	0.086 5
C₅₂	90	1.000 0	0.200 0	0.058 8	0.075 5
C₆₁	87	0.917 4	0.257 1	0.068 1	0.081 8
C₆₂	85	0.800 0	0.307 7	0.075 5	0.086 5
C₆₃	83	0.671 1	0.371 7	0.084 1	0.091 6