Transverse Impact of a Horizontal Beam on a Vertical Column

被引:4
作者
Khowitar, Eid [1 ]
Riggs, H. Ronald [1 ]
Kobayashi, Marcelo H. [2 ]
机构
[1] Univ Hawaii, Dept Civil & Environm Engn, Honolulu, HI 96822 USA
[2] Univ Hawaii, Dept Mech Engn, Honolulu, HI 96822 USA
基金
美国国家科学基金会;
关键词
Shear waves - Finite element method - Floods - Poles;
D O I
10.1061/(ASCE)EM.1943-7889.0001011
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The transverse impact of a uniformly translating beam hitting a fixed-fixed column is investigated. Although in-air impact is considered, the study is motivated by water-driven woody debris during flood, storm surge, and tsunami. Hence, the beam (pole) is assumed to be wood, and the column is concrete, steel, or wood. Given the relatively small magnitude of the impact speed in such events, only elastic impact is considered. An analytical solution method is presented, which is also used to verify finite-element results. The results show that the contact force between the pole and the column depends on the local shear deformation in the pole and the column, and hence Timoshenko beam theory is needed. Multiple impacts are considered, and the whole collision event is divided into contact phases and separation phases. It is shown that for all cases the maximum contact force occurs during later contact phases and its value can reach up to 1.5 times the peak force in the first contact phase. The impact duration of the first contact phase depends on the shear wave in the pole or the column according to the mass and wave speed ratios. The total impulse on the pole ranges between 1.5 and 1.8 times the initial momentum of the pole, depending on the stiffness of the column. The energy exchange during the multiple impacts, while it can be complicated, reveals that for relatively stiff columns the sum of the translational kinetic and bending strain energies of the pole constitutes approximately 90% of the total energy. In all cases considered, relatively little net energy has been transmitted to the column at the time of final separation. (C) 2015 American Society of Civil Engineers.
引用
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页数:13
相关论文
共 26 条
[1]   Estimation of demands resulting from inelastic axial impact of steel debris [J].
Aghl, P. Piran ;
Naito, C. J. ;
Riggs, H. R. .
ENGINEERING STRUCTURES, 2015, 82 :11-21
[2]   Full-Scale Experimental Study of Impact Demands Resulting from High Mass, Low Velocity Debris [J].
Aghl, P. Piran ;
Naito, C. J. ;
Riggs, H. R. .
JOURNAL OF STRUCTURAL ENGINEERING, 2014, 140 (05)
[3]  
ASCE, 2010, ASCE/SEI 7-16, DOI DOI 10.1061/9780784414248
[4]  
Boley B.A., 1955, Journal of Applied Mechanics, V22, P579, DOI [10.1115/1.4011158, DOI 10.1115/1.4011158]
[5]   Effect of flexibility on low velocity impact response [J].
Christoforou, AP ;
Yigit, AS .
JOURNAL OF SOUND AND VIBRATION, 1998, 217 (03) :563-578
[6]   Numerical evaluation of tsunami debris impact loading on wooden structural walls [J].
Como, Anisa ;
Mahmoud, Hussam .
ENGINEERING STRUCTURES, 2013, 56 :1249-1261
[7]   Transverse impact of free-free square aluminum beams: An experimental-numerical investigation [J].
Dorogoy, A. ;
Rittel, D. .
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2008, 35 (06) :569-577
[8]   Vibro-Impact Behavior of Two Orthogonal Beams [J].
Ervin, Elizabeth K. .
JOURNAL OF ENGINEERING MECHANICS, 2009, 135 (06) :529-537
[9]   Maximum impact force of woody debris on floodplain structures [J].
Haehnel, RB ;
Daly, SF .
JOURNAL OF HYDRAULIC ENGINEERING, 2004, 130 (02) :112-120
[10]  
Heintz JA., 2012, GUIDELINES DESIGN ST