Dynamical Analysis of Stiffened Plates under Patch Loading

Srivastava, Ashok; Pandey, Shashank; Kumar, Ashwini

doi:10.2478/ijame-2013-0032

Cited by 7 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For industrial floors with a fundamental natural frequency not higher than 10 Hz, the velocity peak is limited to a maximum of 20 mm/s for short-term vibrations, see Figure 4. Depending on the detailing of joists, girders, and slab, in this regard, the structural behavior of a given floor takes the form of a variably stiffened plate [33][34][35][36]. When the dynamic behavior of the floor in Figure 3 is mostly governed by a 'joist panel model' vibration (i.e., with a fundamental natural frequency that is close to the frequency of the joists in bending about their major axis), Equation (3) can be taken into account for preliminary estimates, thus operating on a b eff × L y equivalent module.…”

Section: Reference Design Stantardsmentioning

confidence: 99%

Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations

2020

View full text Add to dashboard Cite

Machine-induced vibrations represent, for several reasons, a crucial design issue for industrial buildings. At the early design stage, special attention is thus required for the static and dynamic performance assessment of the load-bearing members, given that they should optimally withstand ordinary design loads but also potentially severe machinery operations. The knowledge and reliable description of the input vibration source is a key step, similarly to a reliable description of the structural system, to verify. However, such a kind of detailing is often unavailable and results in a series of simplified calculation assumptions. In this paper, a case-study eyewear factory built in 2019 is investigated. Its layout takes the form of a two-story, two-span (2 × 14.6 m) precast concrete frame (poor customer/designer communication on the final equipment resulted in various non-isolated computer numerical control (CNC) vertical machines mounted on the inter-story floor, that started to suffer from pronounced resonance issues. Following past experience, this paper investigates the validity of a coupled experimental–numerical method that could be used for efficient assessment predictive studies. Based on on-site experiments with Micro Electro-Mechanical Systems (MEMS) accelerometers mounted on the floor and on the machine (spindle included), the most unfavorable machine-induced vibration sources and operational conditions are first characterized. The experimental outcomes are thus used to derive a synthetized signal that is integrated in efficient one-bay finite element (FE) numerical model of the floor, in which the machine–structure interaction can be taken into account. The predictability of marked resonance issues is thus emphasized, with a focus on potential and possible limits of FE methods characterized by an increasing level of detailing and computational cost.

show abstract

Section: Reference Design Stantardsmentioning

confidence: 99%

Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations

2020

View full text Add to dashboard Cite

show abstract

“…The vibration analysis of stiffened plates was made by Hamedani et al (2012) employing both conventional and super finite element methods. Srivastava et al (2004Srivastava et al ( , 2005Srivastava et al ( , 2013 and Srivastava (2012) investigated vibration characteristics of stiffened plates with cut-outs subjected to in-plane uniform and partial edge loadings at the plate boundaries using FEM. These studies show that aspect ratio of the plate, position and number of stiffeners, and size of cut-outs have pronounced effects on the dynamic instability characteristics in comparison to unstiffened plate.…”

Section: Introductionmentioning

confidence: 99%

Seismic response of asymmetric systems with linear and non-linear viscous dampers

Mevada¹,

Jangid²

2012

Int J Adv Struct Eng

View full text Add to dashboard Cite

The free vibration characteristics, such as fundamental frequency and mode shape of stiffened plates employing standard finite element analysis, are investigated in this paper. The parametric study is presented for free vibration characteristics of stiffened plates with various parameters, such as type, orientation and number of stiffeners, boundary conditions and aspect ratio of plates and stiffener depth to plate thickness ratio. Typical mode shapes are also presented for clamped square eccentrically stiffened plates. Finally, design charts with non-dimensional parameters are proposed to determine the fundamental frequency of commonly adopted clamped stiffened plates in construction. These charts will be very much useful for designers for obtaining the fundamental frequencies of the stiffened plates of different dimensions without doing much complicated analysis or using standard computer codes. Keywords Stiffened plates • Frequency • Mode shape • Finite element analysis • Design charts List of Symbols a, b Length (span) and width of plate, respectively, in plan b st , d st Width and depth of stiffener, respectively {d} Eigen vector (mode shape) of stiffened plate E Young's modulus of isotropic plate and stiffener h Thickness of the plate [K e ], [K] Element and overall stiffness matrices of stiffened plates, respectively [K pe ], [K xe ], [K ye ] Element stiffness matrices of plate, x-directional stiffeners and y-directional stiffeners, respectively [M e ], [M] Element and overall mass matrices of stiffened plates, respectively [M pe ], [M xe ], [M ye ] Element mass matrices of plate, x-directional stiffeners and y-directional stiffeners, respectively

show abstract

“…It should not therefore cause catastrophic failure. A.K.L.Srivastava et al [5] have carried out the dynamical Analysis of stiffened plates under patch loading. The vibration characteristics are discussed and the results have been compared with those available in the literature.…”

Section: IImentioning

confidence: 99%

Investigations on Deformation and Stress Pattern of Plates with Various Types of Stiffeners

Devi¹

2017

IJRASET

View full text Add to dashboard Cite

This research work aims to investigate the deformation and stress pattern of plates with various types of stiffeners. The analysis has been carried out using Finite Element Analysis. ANSYS software has been used. Structures consisting of thin plates stiffened by a system of ribs have found wide application for aircraft, ships, bridges, and buildings as well as in many other branches of contemporary structural engineering. The analytical investigations of stiffened plates are rarely found in literature; hence it is found apt to carry out such investigations to provide design recommendations. The finite element analysis has been carried out for an isotropic rectangular plate by considering the master element as a shell 3D 4node 181 element and beam 2node 188 as a stiffener. Comparison has been done between the results obtained from ANSYS simulation and theoretical procedure to verify the approach. During the analysis the optimal thickness, loading and boundary conditions of the plate are kept constant and the cross section of the stiffener was varied. Effectiveness of various cross section of stiffeners were studied.

show abstract

Dynamical Analysis of Stiffened Plates under Patch Loading

Cited by 7 publications

References 18 publications

Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations

Efficiency of Coupled Experimental–Numerical Predictive Analyses for Inter-Story Floors Under Non-Isolated Machine-Induced Vibrations

Seismic response of asymmetric systems with linear and non-linear viscous dampers

Investigations on Deformation and Stress Pattern of Plates with Various Types of Stiffeners

Contact Info

Product

Resources

About