Calibration of Barge Models for the Reliable Prediction of Impact Force on Bridge Piers

2017 ◽  
Author(s):  
D. S. Saini ◽  
B. Shafei
Keyword(s):  
Impact Force ◽  
Bridge Piers ◽  
Reliable Prediction

The Factors Sensitivity Analysis of Drift Ice Impact Force on the Pier

2014 ◽  
Vol 852 ◽  
pp. 472-475
Author(s):  
Su Feng Zhang ◽  
Tian Lai Yu
Keyword(s):  
Impact Force ◽  
Nonlinear Finite Element ◽  
Bridge Piers ◽  
Element Analysis ◽  
Analysis Theory ◽  
Increasing Trend ◽  
Force Impact ◽  
Ice Strength ◽  
Simulation Results ◽  
The Impact

This paper base on the actual form and structure of the original bridge piers actual data, according to the exposure collision theory and nonlinear finite element analysis theory, using LS-DYNA software, research the realationship of drift ice strength, modulus of elasticity, thickness factors with affecting convection ice impact force, while the drift ice impact force impact of the bridge was tested and simulated contrast. Simulation results show that the impact force with the flow of ice floe strength, elastic modulus, the increase of the thickness of the ice sheet was an increasing trend.

The Design and Analysis of Pile Protection Devices for the Qiantang River Bridge

2010 ◽  
Author(s):  
Jin Pan ◽  
Weiguo Wu ◽  
Mingcai Xu
Keyword(s):  
Force Control ◽  
Impact Force ◽  
Design Method ◽  
Bridge Piers ◽  
Deformation Characteristics ◽  
Dynamic Finite Element ◽  
Qiantang River ◽  
Traditional Design ◽  
Protection Devices ◽  
Explicit Dynamic

According to the Qiantang River Bridge project, the pile structures are adopted as protection devices for bridge piers. Because the pile structures are not contact with bridge piers, the traditional design method of impact force control is no longer applicable. Therefore, this paper studies on the large deformation characteristics of piles, takes the interaction between the piles and soil into account by “m” method, puts forward a new anti-collision design method, and at last determined the form and dimension of pile structures. LS-DYNA, a nonlinear explicit dynamic finite-element code, was used for analysis. The protection devices are used to Qiantang River Bridge, and then some useful conclusions were achieved.

Damage assessment of bridge piers subjected to vehicle collision

2018 ◽  
Vol 21 (15) ◽  
pp. 2270-2281 ◽  
Author(s):  
Deyuan Zhou ◽  
Ruiwen Li
Keyword(s):  
Impact Force ◽  
Numerical Study ◽  
Numerical Models ◽  
Failure Process ◽  
Damage Index ◽  
Bridge Piers ◽  
Nonlinear Material ◽  
Force Equation ◽  
Vehicle Collision ◽  
Vehicle Impact

In this article, a method was proposed to assess damage of the bridge piers subjected to vehicle collision with the help of the detailed numerical model. Nonlinear material constitutive laws considering the strain rate effect were adopted in the models. Validation was performed by comparing the numerical results with the available experimental results in terms of impact force, displacement, and failure pattern. Based on the validated numerical models, the failure process and different damage levels of the piers under impacts were analyzed. The results showed a four-stage failure process as well as four damage levels with the increase of the vehicle impact force. According to the numerical study, a new damage index and the corresponding assessment criterion were defined to assess damage of the impacted pier. A vehicle impact force equation and a half-sine impact impulse were developed for damage index.

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.

Visualization of impact force using pressure sensitive paper "Prescale"

2000 ◽  
Vol 10 (PR9) ◽  
pp. Pr9-185-Pr9-190
Author(s):  
K. Ogawa ◽  
T. Yokoyama
Keyword(s):  
Impact Force ◽  
Pressure Sensitive

Dosimetry with 188Re-labelled monoclonal anti-CD66 antibodies

2006 ◽  
Vol 45 (03) ◽  
pp. 134-138 ◽  
Author(s):  
T. Kull ◽  
N. M. Blumstein ◽  
D. Bunjes ◽  
B. Neumaier ◽  
A. K. Buck ◽  
...  
Keyword(s):  
Monoclonal Antibody ◽  
Bone Marrow ◽  
Gamma Camera ◽  
Absorbed Dose ◽  
Correlation Coefficients ◽  
Residence Times ◽  
Reliable Prediction ◽  
Red Bone Marrow ◽  
Antibody Preparation ◽  
Simplified Method

SummaryAim: For the therapeutic application of radiopharmaceuticals the activity is determined on an individual basis. Here we investigated the accuracy for a simplified assessment of the residence times for a 188Re-labelled anti-CD66 monoclonal antibody. Patients, methods: For 49 patients with high risk leukaemia (24 men, 25 women, age: 44 ± 12 years) the residence times were determined for the injected 188Re-labelled anti-CD66 antibodies (1.3 ± 0.4 GBq, 5–7 GBq/mg protein, >95% 188Re bound to the antibody) based on 5 measurements (1.5, 3, 20, 26, and 44 h p.i.) using planar conjugate view gamma camera images (complete method). In a simplified method the residence times were calculated based on a single measurement 3 h p.i. Results: The residence times for kidneys, liver, red bone marrow, spleen and remainder of body for the complete method were 0.4 ± 0.2 h, 1.9 ± 0.8 h, 7.8 ± 2.1 h, 0.6 ± 0.3 h and 8.6 ± 2.1 h, respectively. For all organs a linear correlation exists between the residence times of the complete method and the simplified method with the slopes (correlation coefficients R > 0.89) of 0.89, 0.99, 1.23, 1.13 and 1.09 for kidneys, liver, red bone marrow, spleen and remainder of body, respectively. Conclusion: The proposed approach allows reliable prediction of biokinetics of 188Re-labelled anti-CD66 monoclonal antibody biodistribution with a single study. Efficient pretherapeutic estimation of organ absorbed dose may be possible, provided that a more stable anti-CD66 antibody preparation is available.

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