Study of Extreme Wave Forces on T-and Box-Types Girder
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摘要:近海桥梁常采用的箱形截面主梁与T形截面主梁由于几何构型差异较大，在极端波浪（海啸和飓风）作用下波浪力有较大差别. 分别以孤立波、椭圆余弦波模拟海啸和飓风波浪，基于RANS方程和SST k- ω湍流模型建立二维数值模型，采用VOF (volume of fluid)法追踪自由液面，对数值水槽造波效果及波浪力计算结果进行验证；在此基础上，分析海啸和飓风作用下波高及淹没系数对T梁、箱梁受力的影响，并比较二者受力差别. 研究结果表明：海啸波作用下,箱梁受到的水平力峰值小于T梁，最大差值接近箱梁水平力峰值的32%，箱梁的竖向力峰值大于T梁，最大差值接近T梁竖向力峰值的13%； 飓风波作用下，箱梁的水平力峰值小于T梁，最大差值接近箱梁水平力峰值的31%，且箱梁的竖向力峰值小于T梁竖向力峰值；相比于飓风波，海啸对桥梁主梁的作用力更大，对桥梁安全性威胁更大.Abstract:The extreme wave forces on costal bridges with T-type girder and box-type girder have great differences due to their special geometrical shapes. First, numerical models based on solitary wave theory and cnoidal wave theory were developed to simulate the tsunami waves and hurricane waves, in which the RANS (Reynolds-averaged Navier-Stokes) equations combined with the SST (shear stress transport) k- ωturbulence model were utilized to describe the mean flow motion, and the VOF (volume of fluid) method was used to trace the interface of air and water. Then, the effectiveness of the numerical models was verified. On this basis, the tsunami and hurricane induced wave forces on T-type girder and box-type girder were compared and discussed, considering different wave heights and submergence depths. The results show as follows: Tsunami wave induced horizontal peak forces on T-type girder are greater than those on box-type girder by over 32%; however, the box-type girder suffers greater vertical peak forces than the T-type girder and the maximum difference between them is near 31%. Hurricane induced horizontal peak forces on T-type girder are greater than those on box-type girder by over 31%; meanwhile, the vertical peak forces on T-type girder are also greater than those on box-type girder. Compared with hurricane waves, tsunami waves pose a greater threat to the safety of coastal bridges.
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Key words:
- tsunami/
- hurricane/
- wave force/
- T-type girder/
- box-type girder/
- numerical model
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图 4网格尺寸变化对箱梁所受海啸竖向力峰值的影响
Figure 4.Variations of horizontal wave force versus different mesh sizes
图 5波面数值解与理论解对比
Figure 5.Comparison of water elevation between numerical results and the theoretical results
图 6波浪力数值解与试验值对比
Figure 6.Comparison of wave forces between numerical results and experimental data
图 7海啸作用下T梁与箱梁波浪力时程
Figure 7.Time series of tsunami wave forces on T girder and box girder
图 10T梁和箱梁在Cs= −0.1时受飓风波浪力的时程曲线（H= 0.3d）
Figure 10.Time-histories of hurrican wave forces on T girder and box girder whenCs= −0.1，H= 0.3d
表 1计算工况
Table 1.The calculation condition
模型类型 模型
截面d/m 波浪类型 波高H/m Cs Ⅰ T梁/箱梁 0.086 孤立波 0.1d～0.5d 0.3、0、−0.1 Ⅱ T梁/箱梁 0.086 椭圆余弦波 0.1d～0.4d 0.3、0、−0.1 
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FRENCH J A. Wave uplift pressures on horizontal platforms[D]. California: California Institute of Technology, 1970. KULIN G. Solitary wave forces on submerged cylinders and plates[R]. Washington D. C.: National Bureau of Standards, 1958. MCPHERSON R L. Hurricane induced wave and surge forces on bridge decks[D]. Texas: Texas A & M University, 2008. 方庆贺. 跨海近岸桥梁极端波浪作用研究[D]. 哈尔滨: 哈尔滨工业大学, 2012. HAYATDAVOODI M, SEIFFERT B, ERTEKIN R C. Experiments and computations of solitary-wave forces on a coastal-bridge deck. part II:deck with girders[J]. Coastal Engineering, 2014, 88: 210-228.doi:10.1016/j.coastaleng.2014.02.007 GUO A, FANG Q, BAI X, et al. Hydrodynamic experiment of the wave force acting on the superstructures of coastal bridges[J]. Journal of Bridge Engineering, 2015, 20(12): 04015012.1-04015012.11. HAYASHI H, AOKI K, SHIJO R, et al. Study on tsunami wave force acting on a bridge superstructure[C]//Proceedings of the 29th US-Japan Bridge Engineering Workshop. Tsukuba: [s.n.], 2013: 1-12. 张家玮,祝兵,康啊真,等. 跨海桥梁箱梁结构受波浪力作用试验研究[J]. 土木工程学报,2017,50(12): 80-86.ZHANG Jiawei, ZHU Bing, KANG Azheng, et al. Experimental study on wave loads on box girders in costal bridges[J]. China Civil Engineering Journal, 2017, 50(12): 80-86. HUANG B, ZHU B, CUI S, et al. Experimental and numerical modelling of wave forces on coastal bridge superstructures with box girders,part I:regular waves[J]. Ocean Engineering, 2018, 149: 53-77.doi:10.1016/j.oceaneng.2017.11.046 NAKAO H, NOZAKA K, IZUNO K, et al. Tsunami hydrodynamic force on various bridge sections[C]//15th World Conf. Earthquake Engineering. Lisbon Portuguese: WCEE, 2012: 1-9. SARPKAYA T, ISAACSON M. Mechanics of wave forces on offshore structures[M]. New York: Van Nostrand Reinhold, 1981: 231-256. KORTEWEG D J, DE VRIES G. On the change of form of long waves advancing in a rectangular canal,and on a new type of long stationary waves[J]. Phil. Mag, 1895, 39(5): 422-443. -
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