scholarly journals Laminated Glass Cantilevered Plates under Static and Impact Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Luigi Biolzi ◽  
Antonio Bonati ◽  
Sara Cattaneo
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Impact Loading ◽  
Structural Performance ◽  
Laminated Glass ◽  
Finite Element Analyses ◽  
Tempered Glass ◽  
Low Velocity ◽  
Glass Plates ◽  
Experimental Findings

The structural performance of cantilevered laminated glass plates for different glass thicknesses and interlayers is considered in this paper. Heat-strengthened and tempered glass plies and two different interlayer films were utilized. The response of laminated glass specimens is then evaluated under low-velocity hard and semirigid impacts. Experimental findings were simulated and discussed by means of finite element analyses. In particular, this discussion includes the evaluation of the influence that the fixed edge clamping technique (number of clamps, their size, and their stiffness) has on the stress distribution in the specimens.

scholarly journals On the Numerical Modelling of Bond for the Failure Analysis of Reinforced Concrete

2017 ◽  
Author(s):  
Peter Grassl ◽  
Morgan Johansson ◽  
Joosef Leppänen
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Impact Test ◽  
Nonlinear Finite Element ◽  
Structural Performance ◽  
Finite Element Analyses ◽  
Tension Stiffening ◽  
Bond Slip ◽  
Element Size ◽  
Weight Impact

The structural performance of reinforced concrete relies heavily on the bond between reinforcement and concrete. In nonlinear finite element analyses, bond is either modelled by merged, also called perfect bond, or coincident with slip, also called bond-slip, approaches. Here, the performance of these two approaches for the modelling of failure of reinforced concrete was investigated using a damage-plasticity constitutive model in LS-DYNA. Firstly, the influence of element size on the response of tension-stiffening analyses with the two modelling approaches was investigated. Then, the results of the two approaches were compared for plain and fibre reinforced tension stiffening and a drop weight impact test. It was shown that only the coincident with slip approach provided mesh insensitive results. However, both approaches were capable of reproducing the overall response of the experiments in the form of load and displacements satisfactorily for the meshes used.

A method for the measurement of residual stresses using a fracture mechanics approach

1989 ◽  
Vol 24 (1) ◽  
pp. 23-30 ◽  
Author(s):  
K J Kang ◽  
J H Song ◽  
Y Y Earmme
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Fracture Mechanics ◽  
Residual Stresses ◽  
Residual Stress Distribution ◽  
The State ◽  
Two Dimensional ◽  
Finite Element Analyses ◽  
Simple Method

A simple method for measuring residual stresses in a plate is described. In this method residual stresses are evaluated using a fracture mechanics approach, that is, the strains or displacements measured at a point on the edge of a plate as a crack is introduced and extended from the edge are used to deduce the state of stresses that existed in the uncracked plate. Through finite element analyses and experiments this method is shown to be valid and effective for measuring the two-dimensional residual stress distribution of a welded plate.

Preliminary Finite Element Analyses on Seismic Resistant FREE from DAMage Beam to Column Joints under Impact Loading

2018 ◽  
Vol 763 ◽  
pp. 592-599 ◽  
Author(s):  
Marina D'Antimo ◽  
Mariana Zimbru ◽  
Mario D'Aniello ◽  
Jean François Demonceau ◽  
Jean Pierre Jaspart ◽  
...  
Keyword(s):  
Finite Element ◽  
Impact Loading ◽  
Rational Design ◽  
Design Guidelines ◽  
Dissipative Systems ◽  
Finite Element Analyses ◽  
Steel Moment Resisting Frames ◽  
Structural Robustness ◽  
Moment Resisting ◽  
Push Down

Nowadays, the interest on structural robustness is increasing because of the recent terroristic attacks. Although a large number of research projects have been carried out in this field, limited design guidelines as well as code recommendations are nowadays available. Leading to the fact that the design for robustness is far from being current practice. Conversely, the design for natural hazards as the earthquake is a well-consolidated practice and modern codes implement effective and well-recognized design rules. Even though seismic design philosophy based on the concept of hierarchy of resistance enables structural robustness for conventional structural systems, this is not demonstrated for structures equipped with anti-seismic devices as well as innovative dissipative systems. Recently, the use of friction based dissipative joints has been proved to be a promising solution for seismically design steel moment resisting frames. However, the robustness and the resistance against impact loading of this type of joints is not yet investigated. With the aim to develop an experimental campaign based on impact tests, preliminary finite element analyses have been carried out to identify the main criticisms and to drive the rational design of the joint specimens. With this regard, in the present paper, the results of a numerical parametric study on the preliminary push-down test are presented and discussed.

Engineering Studies on Joint Bar Integrity: Part II — Finite Element Analyses

2014 ◽  
Author(s):  
Michael E. Carolan ◽  
David Y. Jeong ◽  
A. Benjamin Perlman
Keyword(s):  
Finite Element ◽  
Structural Integrity ◽  
Structural Response ◽  
Relative Effect ◽  
Structural Performance ◽  
Finite Element Analyses ◽  
Field Surveys ◽  
Engineering Studies ◽  
Toe Angle ◽  
Support Conditions

This paper is the second in a two-part series describing research sponsored by the Federal Railroad Administration (FRA) to study the structural integrity of joint bars. In Part I, observations from field surveys of joint bar inspections conducted on revenue service track were presented [1]. In this paper, finite element analyses are described to examine the structural performance of rail joints under various loading and tie-ballast support conditions. The primary purpose of these analyses is to help interpret and understand the observations from the field surveys. Moreover, the finite element analyses described in this paper are applied to conduct comparative studies and to assess the relative effect of various factors on the structural response of jointed rail to applied loads. Such factors include: discrete tie support (i.e. supported joint versus suspended joint with varying spans between effective ties), bolt pattern (four versus six bolts), initial bolt tension, and easement. In addition, results are shown for 90 lb rail joined with long-toe angle bars compared to 136 lb rail joined with standard short-toe joint bars.

scholarly journals On the Numerical Modelling of Bond for the Failure Analysis of Reinforced Concrete

2017 ◽  
Author(s):  
Peter Grassl ◽  
Morgan Johansson ◽  
Joosef Leppänen
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Impact Test ◽  
Nonlinear Finite Element ◽  
Structural Performance ◽  
Finite Element Analyses ◽  
Tension Stiffening ◽  
Bond Slip ◽  
Element Size ◽  
Weight Impact

The structural performance of reinforced concrete relies heavily on the bond between reinforcement and concrete. In nonlinear finite element analyses, bond is either modelled by merged, also called perfect bond, or coincident with slip, also called bond-slip, approaches. Here, the performance of these two approaches for the modelling of failure of reinforced concrete was investigated using a damage-plasticity constitutive model in LS-DYNA. Firstly, the influence of element size on the response of tension-stiffening analyses with the two modelling approaches was investigated. Then, the results of the two approaches were compared for plain and fibre reinforced tension stiffening and a drop weight impact test. It was shown that only the coincident with slip approach provided mesh insensitive results. However, both approaches were capable of reproducing the overall response of the experiments in the form of load and displacements satisfactorily for the meshes used.

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