scholarly journals Effect of Joint Characteristics and Geometries on Tunnel-Type Anchorage for Suspension Bridge

2021 ◽  
Vol 11 (24) ◽  
pp. 11688
Author(s):  
Hyunsung Lim ◽  
Seunghwan Seo ◽  
Junyoung Ko ◽  
Moonkyung Chung
Keyword(s):  
Rock Joint ◽  
Three Dimensional ◽  
Suspension Bridge ◽  
Friction Angle ◽  
Rock Joints ◽  
Joint Orientation ◽  
Pull Out ◽  
Joint Characteristics ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this study, the pull-out behavior of a tunnel-type anchorage was examined by considering both geometric and rock joint characteristics. Three-dimensional finite element analyses were performed with reference to the tunnel-type anchorage cases designed and constructed in Korea. The factors influencing the anchorage response were analyzed: the enlarged part, anchorage spacing, joint orientation, spacing, and the shear strength of the rock joints. According to the numerical studies, the size of the enlarged part influenced the failure shape of the tunnel-type anchorage. It was found that the anchorage spacing, the relationship between the tunnel-type anchorage, and the joint orientation and spacing greatly influenced the pull-out behavior of the anchorage. Additionally, the friction angle had a larger impact on the anchorage’s pull-out resistance than the cohesion between the rock joints.

Dynamic Characteristics Simulation and Analysis for the Stable Type Suspension Bridge

2013 ◽  
Vol 444-445 ◽  
pp. 173-177
Author(s):  
Xiao Chun Wang ◽  
Ben Ning Qu ◽  
Jiao Long Peng ◽  
Meng Xi Geng
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Suspension Bridge ◽  
Element Model ◽  
Fish Bone ◽  
Suspension Bridges ◽  
Stable Type ◽  
Stable Suspension ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Under the background of a stable type suspension bridge (A suspension bridge with a inverse-tensional system), the effect of inverse-tensional system for suspension bridge is studied. Using finite element method, three-dimensional finite element model of stable type suspension bridge and a common suspension bridge is established by fish bone model consisting of beam elements respectively. The finite element characteristic equation of two bridges is solved with Block Lanczos method respectively. 20 order eigenpairs of two kind of suspension bridges are obtained. The inherent characteristics of the two type bridges are analyzed comparatively. The results showed that due to the effect of inverse-tensional structures, the overall stiffness of the stable suspension bridge is better than common suspension bridge obviously, which can effectively suppress the torsional vibration of the suspension bridge.

Modelling of Bond Behavior of Injected Anchors in Masonry Elements

2019 ◽  
Vol 817 ◽  
pp. 126-133
Author(s):  
Francesca Ceroni ◽  
Thomas Celano
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Fe Model ◽  
Bond Behaviour ◽  
Pull Out ◽  
Strength Capacity ◽  
Steel Bars ◽  
Dimensional Finite Element ◽  
Global Strength ◽  
Three Dimensional Finite Element

The paper focuses attention on the performance of injected anchors embedded in masonry elements. The bond behaviour is investigated by means of a three-dimensional Finite Element model aimed to assess the global strength capacity of the injected anchors and to investigate the stresses distribution in the masonry element when some meaningful parameters change. Along the anchor-grout and grout-masonry interfaces, nonlinear bond laws have been assumed. Such laws have been assessed by comparing the FE model outcomes with the experimental results of pull-out tests carried out on ribbed steel bars embedded by means of lime-based grout in prisms made of tuff stones

Experimental and Numerical Study of Reinforcement Strains in RC Ties

2021 ◽  
Vol 322 ◽  
pp. 100-105
Author(s):  
Ronaldas Jakubovskis ◽  
Domas Valiukas ◽  
Gintaris Kaklauskas
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Microscopic Level ◽  
Scale Model ◽  
Strain Gauges ◽  
Transfer Length ◽  
Pull Out ◽  
Dimensional Finite Element ◽  
Element Approach ◽  
Three Dimensional Finite Element

The importance of interaction between concrete and reinforcement for reinforced concrete (RC) mechanics is a known issue, yet its complexity enforces one to perform in-depth investigations at the microscopic level. In this paper, short RC ties with lengths less than transfer length of bond stresses were chosen to investigate contact zones between concrete and reinforcement. A three-dimensional finite element approach (Model-3D) with simplified geometry of ribs (rib-scale model) is modelled. Its effectiveness is checked against the results yielded by a number of double pull-out tests on RC prisms, where the strain distribution of the bars was measured with strain gauges. As it turns out, the considered model shows a good correlation with experimental data at different loading levels, and the most important factor describing the effectiveness is the geometry of ribs.

Numerical evaluation of a deeply buried pipe testing facility

2018 ◽  
Vol 21 (16) ◽  
pp. 2571-2588 ◽  
Author(s):  
Van Thien Mai ◽  
Neil Hoult ◽  
Ian Moore
Keyword(s):  
Boundary Conditions ◽  
Three Dimensional ◽  
Friction Angle ◽  
Buried Pipe ◽  
Overburden Pressure ◽  
Testing Procedures ◽  
Novel Approach ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
The Impact

A new facility for testing pipes under deep burial has been developed. However, before the facility was commissioned, the influence of the loading scheme and boundary conditions on the pipe behaviour was investigated so that the most appropriate experimental setup could be developed. Two- and three-dimensional finite element analyses were used to assess the impact of the top and side boundary conditions on both flexible and rigid pipes with varying diameters. The vertical overburden pressures expected in the field are simulated using actuators applying vertical forces to two steel grillages. The numerical results show that the use of two independent grillages on the surface produced a more uniformly distributed ‘overburden’ pressure, a novel approach that performs significantly better than previous loading systems. Proximity of the test facility’s walls to the pipes was also investigated and found to have less than a 0.2% impact on pipe response when compared to simulations of field geometries. Results examining five different approaches to reducing the effect of sidewall friction were compared to the case of zero friction (i.e. the field case), and it was found that while lubricating the wall to create a friction angle of 5° over the full height produced the most accurate results, lubrication of only the top 2.5 m of the wall also produces thrust forces and bending moments within 10% of values from the zero-friction case. Finally, the effect of the position of the pipe within the test cell was investigated, where pipe testing with 0.3 m of bedding is expected to produce results like those for pipes close to rock foundations in the field. These results are already being used to inform testing procedures using this unique facility.

scholarly journals Estimation of the Fatigue Life of Railroad Joint Bars

2007 ◽  
Author(s):  
Brandon Talamini ◽  
David Y. Jeong ◽  
Jeff Gordon
Keyword(s):  
Fatigue Life ◽  
Dynamic Load ◽  
Three Dimensional ◽  
Load Factor ◽  
Element Analysis ◽  
Joint Characteristics ◽  
Dimensional Finite Element ◽  
Bending Stresses ◽  
Track Stiffness ◽  
Three Dimensional Finite Element

This paper investigates the influence of physical track conditions in the vicinity of a rail joint on the fatigue life of the joint bars. Recent derailments due to broken joint bars, such as the Minot, ND accident in January 2002, have highlighted the need for better understanding of the effects of joint conditions on premature joint bar failure. Fatigue life estimates can be used to guide the selection of inspection intervals for joint bars in service. Engineering approximations are used to infer the dynamic load factor at a rail joint due to joint characteristics including: • rail end gap; • joint efficiency (looseness); • track stiffness (vertical foundation modulus). A three-dimensional finite element analysis of a rail joint is conducted and the dynamic load is applied to develop an estimate of the live (bending) stresses at the joint due to passing wheels. These stresses are then used to estimate the fatigue life of the joint bars. The methodology is demonstrated for 132RE rail with companion joint bars. The effect of thermal expansion (or the temperature difference below the rail neutral temperature) is investigated. Typical wheel loads and railcar speeds are considered and results are presented for a baseline a joint condition.

scholarly journals Effect of Modification of Deck Properties on Suspension Bridges

2017 ◽  
Vol 12 (1) ◽  
pp. 39-50
Author(s):  
Jagat Kumar Shrestha
Keyword(s):  
Three Dimensional ◽  
Suspension Bridge ◽  
Design Parameters ◽  
Suspension Bridges ◽  
Finite Element Models ◽  
Real World Problem ◽  
Dimensional Finite Element ◽  
Design Requirements ◽  
Three Dimensional Finite Element ◽  
Steel Deck

Different type of deck configuration has been used for suspension bridge depending upon different design requirements. Changes in deck properties lead to changes in behavior of a suspension bridge. In this study, effect of deck modification of a existing bridge from timber to steel deck is considered. Three dimensional finite element models is developed and analyzed changing the deck material from timber to steel which causes reduction in weight and changes in design parameters. This changes the dynamic behavior of the bridge and affects the performance of bearings. The study has been carried out in real world problem encountered in Mugling Suspension Bridge over Trishuli River in Nepal. The study has come up with conclusions and recommendations to increase mass of deck material and replacement of bearings for better performance.Journal of the Institute of Engineering, 2016, 12(1): 39-50

Dynamic Performance Analysis of Single Tower Self-Anchored Suspension Bridge Using Measured Modal Identification

2012 ◽  
Vol 256-259 ◽  
pp. 1557-1562
Author(s):  
Zhi Guo Ma ◽  
Zhi Jun Li ◽  
Yi Huan Zhu ◽  
Xiao Wen Zhu
Keyword(s):  
Dynamic Performance ◽  
Three Dimensional ◽  
Joint Stiffness ◽  
Suspension Bridge ◽  
Element Model ◽  
Modal Identification ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Dynamic Performance Analysis ◽  
Suspension Structure

Recent years, Single tower self-anchored suspension structure system is more available around us. The research on dynamic characteristic types of structures is an example Nanjing Jiangxin-island Bridge, together with its field modal test and calculated value from a three-dimensional finite element model which focuses on the boundary sensitivity impact to dynamic characteristics of such bridges. The results show that, larger error appears when we do not consider expansion joint stiffness and bearing friction force relative to measured value, so this phenomenon should have to be considered. The conclusions provide important research basis for design and health monitoring of the bridge.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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