On-Site Experimental Testing to Study the Vibration of Composite Floors

2014 ◽  
Vol 601 ◽  
pp. 231-234
Author(s):  
Cristian Lucian Ghindea ◽  
Dan Cretu ◽  
Monica Popescu ◽  
Radu Cruciat ◽  
Elena Tulei
Keyword(s):  
Dynamic Characteristics ◽  
Experimental Testing ◽  
Concrete Slab ◽  
Human Perception ◽  
Experimental Tests ◽  
International Standards ◽  
Structural Element ◽  
Element Analysis ◽  
Floor Slabs ◽  
Composite Floors

As a general trend, in order to reduce material consumption or to reduce the mass of the structures, composite floor slabs solutions are used to achieve large spans floor slabs. This solutions led to floors sensitive to vibrations induced generally by human activities. As a verification of the design concepts of the composite floors, usually, it is recommended a further examination of the floor after completion by experimental tests. Although the experimental values of the dynamic response of the floor are uniquely determined, the processing can take two directions of evaluation. The first direction consist in determining the dynamic characteristics of the floor and their comparison with the design values. Another way that can be followed in the processing of the experimental results is to consider the human perception and comfort to the vibration on floors. The paper aims to present a case study on a composite floor, with steel beams and concrete slab, tested on-site. Both aspects of data processing are analyzed, in terms of the structural element, and in terms of the effect on human perception and comfort. Experimentally obtained values for the dynamic characteristics of the floor are compared with numerical values from finite element analysis, while the second type of characteristic values are compared with various human comfort threshold values found in international standards.

scholarly journals Experimental and Numerical Investigation into Failure Modes of Tension Angle Members Connected by One Leg

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5141
Author(s):  
Edyta Bernatowska ◽  
Lucjan Ślęczka
Keyword(s):  
Numerical Simulations ◽  
Failure Mode ◽  
Failure Modes ◽  
Experimental Testing ◽  
Load Capacity ◽  
Strength Function ◽  
Experimental Tests ◽  
Material Model ◽  
Design Standards ◽  
Element Analysis

This paper presents the results of experimental and numerical tests on angle members connected by one leg with a single row of bolts. This study was designed to determine which failure mode governs the resistance of such joints: net section rupture or block tearing rupture. Experimental tests were insufficient to completely identify the failure modes, and it was necessary to conduct numerical simulations. Finite element analysis of steel element resistance based on rupture required advanced material modelling, taking into account ductile initiation and propagation of fractures. This was realised using the Gurson–Tvergaard–Needleman porous material model, which allows for analysis of the joint across the full scope of its behaviour, from unloaded state to failure. Through experimental testing and numerical simulations, both failure mechanisms (net section and block tearing) were examined, and an approach to identify the failure mode was proposed. The obtained results provided experimental and numerical evidence to validate the strength function used in design standards. Finally, the obtained results of the load capacity were compared with the design procedures given in the Eurocode 3′s current and 2021 proposed editions.

Finite Element Analysis for Impact Tests on Polycarbonate Safety Guards: Comparison With Experimental Data and Statistical Dispersion of Ballistic Limit

2020 ◽  
Vol 6 (4) ◽  
Author(s):  
Alessandro Stecconi ◽  
Luca Landi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Standardized Test ◽  
Experimental Tests ◽  
Testing Procedure ◽  
International Standards ◽  
Ballistic Limit ◽  
Element Analysis ◽  
Statistical Dispersion ◽  
The Impact

Abstract Design and testing of machine guards are provided by international standards in which the inadequacy/suitability of the tested materials for machine guards is obtained by the perforation/nonperforation of the guard in an experimental test at the maximum foreseeable speed of a standardized projectile. Uncertainties and limitations of this standardized test are known by researchers, but a better testing procedure is not already agreed on the standardization level. In this paper, finite element analysis of the impact of three different projectiles of a given mass on polycarbonate guards is presented and compared with experimental tests made using a standardized gas cannon. The good correlation found in terms of ballistic limit, energy absorbed, and residual velocity is presented trying to open the discussion to a “probability of perforation.” Moreover, a statistical analysis of experimental results, based on a nonlinear regression model, is briefly introduced. The penetration behavior is described by the well-known Recht and Ipson equation, and an evaluation of the statistical dispersion of the ballistic limit for each type of projectile is presented through the calculation of confidence intervals.

Structural analysis of wing ribs obtained by additive manufacturing

2019 ◽  
Vol 25 (4) ◽  
pp. 708-720 ◽  
Author(s):  
Pedro Miguel Cardoso Carneiro ◽  
Pedro Gamboa
Keyword(s):  
Additive Manufacturing ◽  
Structural Analysis ◽  
Fused Deposition Modeling ◽  
Experimental Testing ◽  
Experimental Tests ◽  
Limiting Factor ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Content Type ◽  
Fused Deposition

Purpose Additive manufacturing (AM) has emerged over the past years as a key technology in aircraft structural components’ manufacturing. This paper aims to describe the numerical analysis and experimental testing of five wing ribs with different 2D topologies manufactured with polylactic acid (PLA) using the fused deposition modeling technology. The main purpose is to determine the best wing rib topology in terms of strength, stiffness and mass. Design/methodology/approach Numerical analyses are performed using Ansys Workbench’s static structural analysis for two distinct loading cases. In the first loading, the chord-wise distributed load, resulting from wing lift, is replaced by two equivalent concentrated loads at the leading and trailing edges. This simplification allows the numerical results to be experimentally validated. The second loading has distributed loads applied on the upper and on the lower surfaces of the wing rib to produce a more realistic structural response. Experimental tests are performed with the first loading case to determine maximum displacement and failure loads of the wing ribs studied. SEM is used to analyze fracture surfaces. Findings From the five different PLA printed wing rib topologies studied, it is found that truss type configurations are the more structural efficient, that is, truss topologies exhibit better specific strength and specific stiffness. Additionally, the limiting factor in the design of these wing ribs is stiffness rather than strength. Originality/value The work identifies the kind of structural topologies that are best suited for 2D wing ribs obtained by AM and leads the way to more complex and more efficient structural layouts to be explored in the future using topology optimization coupled with simple Finite Element Analysis (FEA).

scholarly journals Uniaxial Tension of Yellow Meranti Timber at an Angle to the Grain

2017 ◽  
Vol 4 (2) ◽  
pp. 83-87
Author(s):  
Yosafat Aji Pranata ◽  
Roky Surono
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Strength ◽  
Uniaxial Tension ◽  
Experimental Tests ◽  
Experimental Results ◽  
Tension Stress ◽  
Structural Element ◽  
Element Analysis ◽  
Grain Angle

Tensile strength measures the force applied to a timber element/structural element to the point where it breaks. In this paper, a finite element analysis (FEA) of uniaxial tension of Yellow Meranti timber (Shorea spp.), using von Mises Criterion to include orthotropic nature of the material, was used to derive a prediction of tensile strength at an angle to the grain (cross grain) in plane stress (2D) modeling. To investigate the validity of the finite element analysis results, various 5°, 10°, and 15° cross grain specimens of Yellow Meranti (Shorea spp.) were tested in laboratory under uniaxial tension stress using UTM instrument. Comparison with experimental results shows that the FEA simulation predicts the stress-strain curves lower than experimental results, which result shows good agreement, it is seen from %-relative difference which is less than 30%. Calculations were performed with the numerical analysis (FEA) and Experimental Tests gives results that the difference is not too significant, for specimens with a grain angle of 5° difference in outcomes by 27%, for a grain angle of 10° difference in outcomes by 25%, and for a grain angle 15° difference in outcomes by 22%.

scholarly journals Impact Testing on Composite Panels of Fiberglass, Carbon and Kevlar-Carbon A comparison and validation study

2017 ◽  
Vol 54 (4) ◽  
pp. 700-707 ◽  
Author(s):  
Emilian Ionut Croitoru ◽  
Gheorghe Oancea ◽  
Nicolae Constantin
Keyword(s):  
Validation Study ◽  
Experimental Testing ◽  
Software Tool ◽  
Experimental Tests ◽  
Carbon Composite ◽  
Impact Testing ◽  
Composite Panels ◽  
Statistical Distributions ◽  
Element Analysis ◽  
Design Expert

A validation study between finite element analysis and experimental testing considering an impact loading of Fiberglass, Carbon and Kevlar-Carbon composite panels of 150 x 100 mm2 was conducted by the authors. Using the design of experiments method and the Design Expert software tool, the data obtained in FEA environment is validated, through means of statistical distributions, by the experimental tests results.

scholarly journals FINITE ELEMENT ANALYSIS ON DYNAMIC CHARACTERISTICS OF THE BUILDING FRAME

2019 ◽  
Vol 7 (1) ◽  
pp. 39-44
Author(s):  
Галина Кравченко ◽  
Galina Kravchenko ◽  
Елена Труфанова ◽  
Elena Trufanova ◽  
Дмитрий Тронин ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
Natural Vibrations ◽  
Element Analysis ◽  
Building Frame ◽  
Floor Slabs ◽  
Static Calculation ◽  
Pulsation Component

The article deals with the study of the dynamic characteristics of the building frame by finite element method, using the method of regulating the stiffness of the system. The spectrum of frequencies and forms of natural vibrations of the building frame is obtained. The pulsation component of the wind load on the two main axes of the building is determined and a static calculation is made taking into account this load. Different variants of the frame modeling differed in the thickness of floor slabs and stiffening diaphragms. Variation of the geometric characteristics of the elements of the frame of the building allowed to choose the best option of the design scheme. The level of dynamic comfort is estimated by the results of the analysis of acceleration of the upper floor of the frame.

scholarly journals Finite Element Analysis of One-Way Hollow Plate Capacity with Bamboo Apus and Bamboo Petung

2021 ◽  
Vol 5 (1) ◽  
pp. 13-23
Author(s):  
Dani Nugroho Saputro ◽  
Arnie Widyaningrum ◽  
Agus Maryoto ◽  
Thomas Calvin Putro Sasongko
Keyword(s):  
Finite Element ◽  
Test Object ◽  
Shear Crack ◽  
Concrete Slab ◽  
Experimental Tests ◽  
Element Analysis ◽  
Concentrated Load ◽  
Structural Reinforcement ◽  
Long Time ◽  
Collapse Behavior

Design capacity is one of the main parameters in the analysis of concrete slab behavior. In general, bent tests for concrete slab will be tested experimentally in the laboratory. However, it requires a lot of energy, cost, and a long time. For that we need a simulation approach with numerical methods that is the finite element method using ABAQUS program. The test object is a composite structure in the form of a one-way hollow plate with bamboo Apus and Petung as structural reinforcement, the test object is modeled in a 3D solid model with a concentrated load. Furthermore, material will be inputted their properties based on the result of experimental tests. Numerical analysis using ABAQUS shows similar collapse behavior with experimental analysis, yet the result of concrete slab capacity to the ultimate and the deflection indicates a difference in the value of the experimental tests. Tests with numerical and experimental methods, both concrete slab specimens with bamboo apus and petung produce a similar crack pattern, namely flexural shear crack. The maximum stress hollow concrete slab bamboo apus +17.71 Mpa and bamboo petung +23.2 Mpa

Theoretical and experimental research on slip and uplift of the timber-concrete composite beam

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 7079-7099
Author(s):  
Jianying Chen ◽  
Guojing He ◽  
Xiaodong (Alice) Wang ◽  
Jiejun Wang ◽  
Jin Yi ◽  
...  
Keyword(s):  
Differential Equations ◽  
Deformation Theory ◽  
Concrete Slab ◽  
Theoretical Calculations ◽  
Structural Element ◽  
Structural Efficiency ◽  
Theoretical Investigations ◽  
New Type ◽  
Interlayer Slip ◽  
Good Agreement

Timber-concrete composite beams are a new type of structural element that is environmentally friendly. The structural efficiency of this kind of beam highly depends on the stiffness of the interlayer connection. The structural efficiency of the composite was evaluated by experimental and theoretical investigations performed on the relative horizontal slip and vertical uplift along the interlayer between composite’s timber and concrete slab. Differential equations were established based on a theoretical analysis of combination effects of interlayer slip and vertical uplift, by using deformation theory of elastics. Subsequently, the differential equations were solved and the magnitude of uplift force at the interlayer was obtained. It was concluded that the theoretical calculations were in good agreement with the results of experimentation.

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