摘要
桥梁动态称重(BWIM)系统可通过标定正交异性钢箱梁的纵向加劲肋以识别车辆的轴重信息。基于标定车行驶过桥产生的动态响应信号,计算得到桥梁纵向加劲肋的弯矩影响线;然后基于标定影响线,进而识别过桥车辆的轴重及总重等信息。车辆荷载作用于钢桥面时,得到的动力响应信号可以视为由两部分组成,一部分是加劲肋的响应,称为局部效应,另一部分是箱梁的响应,称为整体效应。基于广东省佛山市佛陈新桥的现场试验,选择四分点和支点两个不同的测试断面进行标定试验,分析BWIM应用于正交异性桥面板时整体效应的影响。结果表明:对于正交异性钢箱梁桥,支点处的局部效应更加显著,整体效应相对较小;四分点及支点两个测试断面的轴重识别均具有较高的精度。
This paper presents a Bridge Weight-in-motion（ BWIM） system in which the longitudinal ribs of an orthotropic box-girder bridge are instrumented to identify axle weights of trucks. Based on the measured dynamic strains caused by the calibrated trucks,the ILs of the longitudinal ribs of OSDs（ Orthotropic Steel Decks） are calibrated. With these calibrated ILs,the axle weights of moving vehicles crossing the instrumented ribs are identified. The live load stress in a rib can be viewed as the sum of two components,one part is contributed to the continuous beam function of the rib（ simply referred to the local effect）,and the other due to the main girder function of the bridge（ referred to the global effect）.A field test was conducted on the Fochen Bridge,a newly constructed OSD bridge,located in Guangdong,China. Two different sections were set to investigate the impact of the global effect when applying BWIM system to OSDs. According to the analysis,the local effect in the support section is more obvious,while the global effect is less significant. Moreover, the identified axle weights agreed with the static measurements,and the identified axle weights by both sections showed similar accuracy of results.
出处
《公路工程》
北大核心
2017年第6期261-267,共7页
Highway Engineering
