Time Variation Characteristics of Impact Force in Collision of Heavy Vehicle to the Bridge Pier

2017 ◽  
Author(s):  
Jiang Qian ◽  
Juan Wang ◽  
Wuchao Zhao ◽  
Deyuan Zhou
Keyword(s):  
Time Variation ◽  
Impact Force ◽  
Bridge Pier ◽  
Heavy Vehicle ◽  
Variation Characteristics

Analysis on the Impact Force of a Ship Colliding with a Bridge Pier

2012 ◽  
Vol 193-194 ◽  
pp. 693-701
Author(s):  
Jian Guo Ding ◽  
Zhi Qiao
Keyword(s):  
Mechanical Model ◽  
Mass Velocity ◽  
Impact Force ◽  
Impact Angle ◽  
Bridge Pier ◽  
Velocity Coefficient ◽  
The Impact

Because many accidents in China involve a ship in a barge fleet colliding with a bridge pier, determining the impact force of the ship is important. To obtain an equation that describes the impact force of a ship colliding with a bridge pier, a mechanical model of the collision is simplified, and the results from other researchers are applied. Based on the equation, it is found that the impact force of a ship colliding with a bridge pier is not only relevant to the mass，velocity, board thicknesses of the ship, and the impact angle, but also to the remaining velocity coefficient. It has been demonstrated that the result from the proposed equation in this paper is in accordance with that of Gkss’s test in Wosin G theory.

Initial response mechanism and local contact stiffness analysis of the floating two-stage buffer collision-prevention system under ship colliding

2021 ◽  
pp. 136943322098610
Author(s):  
Kai Lu ◽  
Xu-Jun Chen ◽  
Zhen Gao ◽  
Liang-Yu Cheng ◽  
Guang-Huai Wu
Keyword(s):  
Kinetic Energy ◽  
Impact Force ◽  
Contact Stiffness ◽  
Impact Angle ◽  
Bridge Pier ◽  
Two Stage ◽  
Collision Prevention ◽  
Prevention System ◽  
The Impact ◽  
Depth Curves

A floating two-stage buffer collision-prevention system (FTBCPS) has been proposed to reduce the impact loads on the bridge pier in this paper. The anti-collision process can be mainly divided into two stages. First, reduce the ship velocity and change the ship initial moving direction with the stretching and fracture of the polyester ropes. Second, consume the ship kinetic energy with the huge damage and deformation of the FTBCPS and the ship. The main feature of the FTBCPS lies in the first stage and most of the ship kinetic energy can be dissipated before the ship directly impacts on the bridge pier. The contact stiffness value between the ship and the FTBCPS can be a significant factor in the first stage and the calculation method of it is the focus of this paper. The contact force, the internal force and the general equation of motion have been given in the first part. The structure model of the ship and the FTBCPS are then established in the ANSYS Workbench. After that, 38 typical load cases of the ship impacting on the FTBCPS are conducted in LS-DYNA. The reduction processes of the ship kinetic energy and the ship velocity in different load cases have been investigated. It can be summarized that the impact angle and the ship initial velocity are the main factors in the energy and velocity dissipation process. Moreover, the local impact force-depth curves have also been studied and the impact angle is found to be the only significant factor on the ship impact process. Next, the impact force-depth curves with different impact angles are fitted and the contact stiffness values are accordingly calculated. Finally, the impact depth range, the validity of the local simulation results and the consistency of the fitted stiffness value are verified respectively, demonstrating that the fitted stiffness values are applicable in the global analysis.

Study on the Assessment of Impact Force Between Ship and Bridge Pier

2019 ◽  
Vol 161 (A4) ◽  
Keyword(s):  
Impact Force ◽  
Bridge Pier ◽  
Bulk Carrier ◽  
Explicit Finite Element ◽  
Collision Response ◽  
The Difference ◽  
Bridge Crossing ◽  
Collision Force ◽  
Comparison Of The Results ◽  
The Impact

The bridge crossing water way is in the risk of impact by vessel, and thus it is very important to estimate the collision force for the safety of bridge. The impact force between bridge pier and vessel is investigated by numerical simulation and various empirical formulae. The collision response between a 5000t DWT bulk carrier with bulb bow and rigid bridge pier is simulated in the explicit finite element code of ANSYS LS-DYNA. The difference of the impact force between the empirical formulae and FE analysis are discussed. Based on the comparison of the results, the coefficient in the formulae is suggested for obtaining more accurate assessment of impact force.

Numerical Simulation of Temporal Evolution of Local Scour in Bridge Pier with Nonuniform Sediment

2011 ◽  
Vol 250-253 ◽  
pp. 3610-3614 ◽  
Author(s):  
Mohammad J. Aarabi ◽  
Mohammad R. Chamani ◽  
Amir A. Dehghani ◽  
Keyvan Asghari
Keyword(s):  
Numerical Simulation ◽  
Time Variation ◽  
Temporal Evolution ◽  
Local Scour ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Nonuniform Sediment ◽  
Natural Rivers

Due to economical and serviceability reasons, local scour must be considered in the design of bridge piers. Although beds of natural rivers consist of nonuniform sediments, but most researches in this subject were carried out with uniform sediments. In nonuniform sediments case, the effect of sheltering of the finer particles by the coarser ones may alter the scour process. In this paper, the time-variation of local scour with nonuniform sediments around a cylinder pier is simulated using SSIIM software. This study shows that the SSIIM is capable of predicting the temporal evolution of local scour in bridge piers with nonuniform sediments.

STUDY ON THE ASSESSMENT OF IMPACT FORCE BETWEEN SHIP AND BRIDGE PIER

2021 ◽  
Vol 161 (A4) ◽  
Author(s):  
J Pan ◽  
S W Huang ◽  
Y F Huang ◽  
M C Xu
Keyword(s):  
Impact Force ◽  
Bridge Pier ◽  
Bulk Carrier ◽  
Explicit Finite Element ◽  
Collision Response ◽  
The Difference ◽  
Bridge Crossing ◽  
Collision Force ◽  
Comparison Of The Results ◽  
The Impact

The bridge crossing water way is in the risk of impact by vessel, and thus it is very important to estimate the collision force for the safety of bridge. The impact force between bridge pier and vessel is investigated by numerical simulation and various empirical formulae. The collision response between a 5000t DWT bulk carrier with bulb bow and rigid bridge pier is simulated in the explicit finite element code of ANSYS LS-DYNA. The difference of the impact force between the empirical formulae and FE analysis are discussed. Based on the comparison of the results, the coefficient in the formulae is suggested for obtaining more accurate assessment of impact force.

Two Dimensional Parametric Analysis of Time Variation Characteristics of Raft Foundation on Saturated Subsoil

2011 ◽  
Vol 90-93 ◽  
pp. 2167-2172
Author(s):  
Chun Yi Cui ◽  
Zhong Tao Wang ◽  
Xiao Fei Li
Keyword(s):  
Pore Water ◽  
Time Variation ◽  
Pore Water Pressure ◽  
Yield Criterion ◽  
Water Pressure ◽  
Fe Model ◽  
Excess Pore Water Pressure ◽  
Raft Foundation ◽  
Variation Characteristics ◽  
Excess Pore

For further discussing time variation characteristics of raft foundation on saturated subsoil due to consolidation, parameterized numerical analyses are completed based on Biot consolidation equations by developing elasto-plastic coupled FE model in plane strain state, together with adopting Mohr-Coulomb yield criterion. Computational results show that internal force and deformation of raft foundation display obvious non-monotonic features, which is associated with dissipation of excess pore water pressure. The disequilibrium of dissipation of excess pore water pressure displays more intensive between subsoil areas near raft center and the border due to less Poission’s ratio of subsoil, which leads to more dissipation time and regulation magnitude of distribution of stress and deformation in subsoil. When subsoil is of low permeability coefficients and Poission’s ratios, the non-monotonic features become more clearly and sustain with longer term variation characteristics.

scholarly journals Design and Fabrication of Safety Impact Guard

2021 ◽  
Vol 9 (VIII) ◽  
pp. 273-281
Author(s):  
Sachin Nikam
Keyword(s):  
Natural Disaster ◽  
Impact Force ◽  
Road Accident ◽  
Heavy Vehicle ◽  
Road Accidents ◽  
Heavy Vehicles ◽  
Terror Attack ◽  
Loss Of Life ◽  
The Impact

Death due to Accidents are greater than natural disaster and terror attack in India. One of the most injurious cases is the crash between car and heavy vehicle. Every year lacks of passengers are killed due to road accidents in which 8% are due to heavy vehicles. Road accident causes loss of life and also property. Accidents can not be avoided completely but the impact force is decreased by application of Design and Fabrication of safety impact guard. Safety impact guard is protecting device used to reduce collision impact at rear end of heavy vehicle when accident occurs.

Numerical analysis of collision between a tractor-trailer and bridge pier

2018 ◽  
Vol 9 (4) ◽  
pp. 484-503 ◽  
Author(s):  
Luwei Chen ◽  
Hao Wu ◽  
Qin Fang ◽  
Tao Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Force ◽  
Element Model ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Highway Bridge ◽  
Heavy Duty ◽  
The Impact ◽  
The Finite Element Model

Accidents involving collisions of heavy-duty trucks with highway bridge piers occurred occasionally, in which the bridge piers might be subjected to severe damage, and cause the collapse of the superstructure due to the loss of axial loading capacity. The existing researches are mostly concentrated on the light- or medium-duty trucks. This article mainly concerns about the collisions between the heavy-duty trucks (e.g. tractor-trailer) and bridge piers as well as the evaluation of the impact force. First, by modifying the finite element model of Ford F800 single-unit truck, which was developed by National Crash Analysis Center, the finite element model of a tractor-trailer is established. Then, the full-scale tractor-trailer crash test on concrete-filled steel pier jointly conducted by Texas Transportation Institute, Federal Highway Administration, and Texas Department of Transportation is numerically simulated. The impact process is well reproduced and the established model is validated by comparison of the impact force. It indicates that the tractor-trailer impact force time history consists of two or three peaks and the corresponding causes are revealed. Furthermore, the parametric influences on the impact force are discussed, including the diameter and cross section shape of the pier, cargo weight, impact velocity, relative impact position, and vehicle type. Finally, the finite element model of an actual reinforced concrete highway bridge pier is established, and the impact force and lateral displacement of the pier subjected to the impact of the tractor-trailer are numerically derived and discussed.

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