为研究特重车荷载作用下PC 板桥的荷载效应,以河北省宣大高速公路WIM 数据为基础,共提取出883 个特重车荷载工况,使用“随机车流-桥梁耦合振动分析系统”计算各工况作用下PC 板桥各片板的最不利正弯矩效应及PC 板桥的最大正弯矩效应。通过对PC 板桥横向各片板最不利正弯矩效应的统计分析研究其横向受力性能,通过最大正弯矩效应与设计荷载效应的对比,分析PC 板桥的特重车正弯矩效应超限情况。结果发现:由于特重车在桥面鲜明的分布特点,PC 板桥1#板的最不利正弯矩效应极值最大,而5#板最不利正弯矩效应的均值最大,在特重车荷载作用下,PC 板桥正弯矩效应超限情况普遍,且部分工况最大正弯矩效应已超越设计荷载效应的1.8 倍,随着跨径的增加,PC 板桥正弯矩效应的超限工况数量、超限程度呈现下降趋势,但降幅并不明显。
For the purpose of studying the load effect of PC slab bridges under extra-heavy trucks, 883 extra-heavy truck scenarios were extracted based on WIM data from Xuanda highway in Hebei Province. The "bridge dynamic analysis system" was used to calculate the most unfavorable sagging moment of each slab and the maximum sagging moment effect of the bridge. The lateral performance of the slabs was investigated using statistics about the most unfavorable sagging moment of each slab. In addition, the overrun of sagging moment of PC slab bridges was analyzed based on comparison of the maximum sagging moment effect and design value. The results show that owing to the apparent distribution characteristics of extra-heavy trucks, the extreme unfavorable sagging moment of slab 1 was the highest, and the average unfavorable sagging moment of slab 5 was the highest. Under extra-heavy truck load, the overrun problem of sagging moment was universal. Besides, the maximum sagging moment of some scenarios was 1.8 times of the design value. Both the quantity of overrun scenarios and overrun level decreased slightly with the increase of bridge span.
[1] 交通运输部综合规划司. 2012年公路水路交通运输行业发展统计公报[EB/OL]. [2014-10-31]. http://www.moc.gov.cn/zizhan/siju/guihuasi/. Integrated Planning Division of Ministry of Transport. Transportation industry statistical bulletin of development of highway and waterway of 2012[EB/OL].[2014-10-31].http://www.moc.gov.cn/zizhan/siju/guihuasi/.
[2] 杭文. 公路货运车辆载重规制策略研究[D]. 南京: 东南大学, 2005. Hang Wen. Vehicle weight regulation research of high-way bridge[D]. Nangjing: Southeast University, 2005.
[3] 马亚丽, 王东威, 李光慧. 基于单板受力的预应力混凝土空心板桥承载力评定[J]. 公路交通科技, 2013, 30(6): 45-48. Ma Yali, Wang Dongwei, Li Guanghui. Evaluation of load-bearing capacity of pre-stressed concrete hollow slab based on single slab load bearing[J]. Journal of Highway and Transportation Research and Development, 2013, 30(6): 45-48.
[4] 赵卓, 蒋晓东, 霍达. 基于破坏荷载试验的预应力混凝土空心板单板受力分析[J]. 北京工业大学学报, 2007, 33(5): 498-501. Zhao Zhuo, Jiang Xiaodong, Huo Da. Single slab bearing analysis of pre-stressed concrete hollow slab based on broken test[J]. Journal of Beijing of Technology, 2007, 33(5): 498-501.
[5] 刘海洋. 预应力混凝土空心板荷载试验有限元模拟[D]. 天津: 天津大学, 2011. Liu Haiyang. Finite element simulation of pre-stressed concrete hollow slab load test[D]. Tianjin: Tianjin University, 2011.
[6] 康省桢. 混凝土空心板梁桥破坏机理试验研究[D]. 郑州: 郑州大学, 2010. Kang Shengzhen. Experimental study on failure mechanism of prestressed concrete hollow slab beam bridge[D]. Zhengzhou: Zhengzhou University, 2010.
[7] 刘家奎. 预应力混凝土空心板纵向裂缝成因分析研究[D]. 重庆: 重庆交通大学, 2013. Liu Jiakui. Analysis of longitudinal cracking for pre-stressed concrete hollow slab[D]. Chongqing: Chongqing Jiaotong University, 2013.
[8] 杨继新. 装配式空心板桥铰缝受力性能研究[D]. 呼和浩特: 内蒙古工业大学, 2009. Yang Jixin. Study on mechanical properties of fabricated hollow slab bridge hinge joints under the load [D]. Huhehaote Inner Mongolia University of Technology, 2009.
[9] 韩万水, 闫君媛, 武隽, 等. 基于长期监测的特重车交通荷载特性及动态过桥分析[J]. 中国公路学报, 2014, 27(2): 54-61. Han Wanshui, Yan Junyuan, Wu Jun, et al. Extra-heavy truck load features and bridge response based on long-term traffic monitoring record [J]. China Journal of Highway and Transport, 2014, 27(2): 54-61.
[10] 赵建峰. 多地域公路桥梁常规车辆及特重车荷载研究[D]. 西安: 长安大学, 2014. Zhao Jianfeng. Research on normal vehicle load and extra-heavy truck load of mutil-regional highway bridges [D]. Xi'an: Chang'an University, 2014.
[11] 中华人民共和国交通运输部. 中华人民共和国交通行业公路桥涵通用图[M]. 北京: 人民交通出版社, 2008. Ministry of Transport of the People's Republic of China. Highway bridge general fig ure of transportation industry of the People's Republic of China[M]. Peking: China Communications Press, 2008.
[12] 汉勃利E C. 桥梁上部构造性能[M]. 郭文辉, 译. 北京: 人民交通出版社, 1982. Hambly E C. Bridge deck Behaviour[M]. Guo Wenhui, Trans. Beijing: China Communications Press, 1982.
[13] 中华人民共和国交通部. JTG D60-2004, 公路桥涵设计通用规范[S]. 北京: 人民交通出版社,2004. Ministry of Transport of the People's Republic of China. JTG D60-2004. General code for design of highway bridges and culverts[S]. Beijing: China Communications Press, 2004.
