不同技术状况等级下公路桥梁限载

李松辉; 李硕; 聂瑞锋; 张宪堂

doi:10.19818/j.cnki.1671-1637.2020.06.011

不同技术状况等级下公路桥梁限载

doi: 10.19818/j.cnki.1671-1637.2020.06.011

山东科技大学土木工程与建筑学院, 山东青岛 266590

基金项目:

国家自然科学基金项目 51874189

山东省自然科学基金项目 ZR2020ME241

详细信息

作者简介:
李松辉(1970-), 男, 山东莱州人, 山东科技大学副教授, 工学博士, 从事桥梁限载分析理论与安全评估研究

中图分类号: U447
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- 被引次数: 0
出版历程
- 收稿日期: 2020-06-12
- 刊出日期: 2020-06-25

Weight limits for highway bridges under different technical condition ratings

College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, Shandong, China

Funds:

National Natural Science Foundation of China 51874189

Natural Science Foundation of Shandong Province ZR2020ME241

More Information

Author Bio:
LI Song-hui(1970-), male, associate professor, PhD, songhui.L@163.com

摘要

摘要: 以现行《公路桥涵养护规范》(JTG H11—2004)为依据, 提出一种考虑桥梁实际技术状况等级的钢筋混凝土简支梁桥限载分析方法, 并推算了不同时期规范中桥梁在不同技术状况等级下的典型车辆限载建议值; 以结构可靠度理论和现行规范设计表达式为基础, 以设计活恒载比为基本参数建立了公路桥梁限载简化分析模型; 以现行桥梁设计规范抗力标准值为基准确定了不同技术状况等级桥梁对应的抗力修正系数; 应用公路桥梁限载分析程序分别计算了按《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTJ 023—85、JTG D62—2004和JTG 3362—2018)设计的桥梁在不同技术状况等级下的限载系数; 依据设计汽车荷载标准值效应限值与典型车辆荷载效应等效假定, 提出了钢筋混凝土简支梁桥的限载建议值。分析结果表明: 在相同的技术状况和安全等级下, JTJ 023—85规范中汽车-超20级和汽车-20级桥梁限载较JTG D62—2004规范中安全等级一级的公路-Ⅰ级和公路-Ⅱ级高, 最大差值分别为1.2和5.0 t; JTG 3362—2018规范中公路-Ⅰ级和公路-Ⅱ级的桥梁限载明显高于JTJ 023—85和JTG D62—2004规范, 最大差值分别为13.8和8.6 t, 且技术状况等级越高, 桥梁限载差值越大; 不同时期规范中桥梁初始设计抗力的差异导致其在相同技术状况等级下的典型车辆限载不同, 在按技术状况等级对在役桥梁制定限载措施时, 应考虑不同时期设计规范的影响。
- 桥梁工程 /
- 限载 /
- 可靠度理论 /
- 限载系数 /
- 抗力修正系数 /
- 抗力折减系数 /
- 技术状况等级
Abstract: In accordance with the current Code for Maintenance of Highway Bridges and Culverts(JTG H11—2004), a weight limit analysis method for reinforced concrete(RC) simply supported beam bridges was proposed by considering the actual technical condition ratings. Moreover, the typical vehicle weight limits for bridges under different technical condition ratings recommended in codes in different periods were determined. Based on the structural reliability theory and design expressions in the current code, a simplified analytical model of weight limits for highway bridges was established by taking the design live-to-dead load ratio as the fundamental parameter. The nominal resistances in the current bridge design code were used as the basis for determining the corresponding resistance correction factors for bridges under different technical condition ratings. A program for the weight limit analysis of highway bridges was used to calculate the weight limit factors of bridges under different technical condition ratings designed in accordance with the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTJ 023—85, JTG D62—2004, and JTG 3362—2018). The recommended weight limits of RC simply supported beam bridges were proposed under the assumption that the standard effect limit of design vehicle load was equivalent to the typical vehicle load effect. Analysis result shows that under the same technical condition rating and safety level, the bridge weight limits with ratings of truck-S20 and truck-20 in the JTJ 023—85 code are higher than those with safety levels of highway-Ⅰ and highway-Ⅱ in the JTG D62—2004 code, and the maximum differences are 1.2 and 5.0 t, respectively. The bridge weight limits with ratings of highway-Ⅰ and highway-Ⅱ in the JTG 3362—2018 code are significantly higher than those in the JTJ 023—85 and JTG D62—2004 codes, and the maximum differences are 13.8 and 8.6 t, respectively. Moreover, the higher the technical condition rating, the greater the difference between the bridge weight limits. The differences in the initial design resistance of bridges in codes in different periods lead to different typical vehicle weight limits under the same technical condition rating. When formulating the weight limit measures for existing bridges according to their technical condition ratings, the influences of design codes in different periods should be considered.
- highway bridge /
- weight limit /
- reliability theory /
- weight limit factor /
- resistance correction factor /
- resistance reduction factor /
- technical condition rating

HTML全文

图 1 标准三轴重车模型

Figure 1. Standard three-axle truck model

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图 2 标准五轴重车模型

Figure 2. Standard five-axle truck model

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表 1 与JTJ 023—85规范中对应的桥梁抗力修正系数

Table 1. Resistance correction factors of bridges according to JTJ 023—85 code

ρ	γ_R	1、2类桥梁	3类桥梁	4类桥梁
0.10	1.312 5	1.166	1.050	0.875
0.25	1.312 5	1.166	1.050	0.875
0.50	1.287 5	1.144	1.030	0.858
1.00	1.250 0	1.111	1.000	0.833
1.50	1.250 0	1.111	1.000	0.833
2.50	1.250 0	1.111	1.000	0.833

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表 2 JTJ 023—85中不同技术状况等级桥梁对应的限载系数

Table 2. Weight limit factors corresponding to different technical condition ratings of bridges in JTJ 023—85 code

限载安全等级	ρ	1、2类桥梁	3类桥梁	4类桥梁
一级	0.10	0.599	0.232
	0.25	0.944	0.426
	0.50	0.997	0.680	0.217
	1.00	1.007	0.802	0.492
	1.50	1.039	0.866	0.605
	2.50	1.064	0.916	0.694
二级	0.10	1.492	0.450
	0.25	1.332	0.780
	0.50	1.226	0.895	0.394
	1.00	1.158	0.939	0.607
	1.50	1.166	0.981	0.701
	2.50	1.172	1.014	0.775

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表 3 JTG D62—2004和JTG 3362—2018规范中不同技术状况等级桥梁对应的限载系数

Table 3. Weight limit factors corresponding to different technical condition ratings of bridges in JTG D62—2004 and JTG 3362—2018 codes

设计安全等级	限载安全等级	ρ	1、2类桥梁	3类桥梁	4类桥梁
一级	一级	0.10
		0.25	0.650
		0.50	0.877	0.578
		1.00	0.987	0.784	0.478
		1.50	1.022	0.851	0.593
		2.50	1.049	0.903	0.684
	二级	0.10	0.765
		0.25	1.017	0.493
		0.50	1.099	0.779	0.297
		1.00	1.137	0.919	0.592
		1.50	1.148	0.964	0.688
		2.50	1.156	0.991	0.764
二级	一级	0.10
		0.25	0.203
		0.50	0.605	0.332
		1.00	0.802	0.617	0.338
		1.50	0.866	0.710	0.476
		2.50	0.916	0.783	0.584
	二级	0.10
		0.25	0.541
		0.50	0.808	0.517
		1.00	0.939	0.741	0.442
		1.50	0.981	0.814	0.562
		2.50	1.014	0.871	0.657

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表 4 车辆荷载换算系数

Table 4. Vehicle load conversion factors

跨径/m	JTG D62—2004规范		JTG 3362—2018规范
跨径/m	m_Ⅰ5	m_Ⅱ3	m_Ⅰ5	m_Ⅱ3
6	1.004	0.878	1.414	1.236
8	1.013	0.886	1.377	1.205
10	1.049	0.867	1.381	1.141
12	1.096	0.876	1.403	1.122
14	1.149	0.898	1.435	1.122
16	1.139	0.928	1.390	1.133
18	1.115	0.962	1.333	1.150
20	1.093	0.998	1.283	1.172
22	1.088	1.037	1.255	1.196
24	1.088	1.077	1.236	1.224
26	1.093	1.118	1.224	1.252
28	1.104	1.160	1.220	1.282
30	1.119	1.203	1.221	1.313
32	1.138	1.246	1.227	1.344
34	1.158	1.289	1.236	1.376
36	1.181	1.333	1.248	1.409
38	1.205	1.377	1.262	1.442
40	1.231	1.422	1.277	1.475

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表 5 JTJ 023—85规范中的桥梁限载建议值

Table 5. Recommended weight limits for bridges in JTJ 023—85 code t

限载安全等级	设计荷载等级	1、2类	3类	4类
一级	汽车-超20级	55.4	44.1	27.1
一级	汽车-20级	30.2	24.1	14.8
二级	汽车-超20级	63.7	51.6	33.4
二级	汽车-20级	34.7	28.2	18.2

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表 6 JTG D62—2004和JTG 3362—2018规范桥梁限载建议值

Table 6. Recommended weight limits for bridges in JTG D62—2004 and JTG 3362—2018 codes t

设计规范	设计安全等级	限载安全等级	设计荷载等级	1、2类	3类	4类
JTG D62—2004	一级	一级	公路-Ⅰ级	54.3	43.1	26.3
		一级	公路-Ⅱ级	25.8	20.5	12.5
		二级	公路-Ⅰ级	62.5	50.5	32.6
		二级	公路-Ⅱ级	29.7	24.0	15.5
	二级	一级	公路-Ⅰ级	44.1	33.9	18.6
		一级	公路-Ⅱ级	20.9	16.1	8.8
		二级	公路-Ⅰ级	51.6	40.8	24.3
		二级	公路-Ⅱ级	24.5	19.3	11.5
JTG 3362—2018	一级	一级	公路-Ⅰ级	66.2	52.6	32.1
		一级	公路-Ⅱ级	33.2	26.4	16.1
		二级	公路-Ⅰ级	76.3	61.7	39.7
		二级	公路-Ⅱ级	38.3	30.9	19.9
	二级	一级	公路-Ⅰ级	53.8	41.4	22.7
		一级	公路-Ⅱ级	27.0	20.8	11.4
		二级	公路-Ⅰ级	63.0	49.7	29.7
		二级	公路-Ⅱ级	31.6	24.9	14.9

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