Dynamic response and critical temperature of a steel beam subjected to fire and subsequent impulsive loading

2014 ◽  
Vol 135 ◽  
pp. 100-108 ◽  
Author(s):  
F. Xi ◽  
Q.M. Li ◽  
Y.H. Tan
Keyword(s):  
Critical Temperature ◽  
Dynamic Response ◽  
Impulsive Loading ◽  
Steel Beam

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

2013 ◽  
Vol 13 (01) ◽  
pp. 1350010 ◽  
Author(s):  
IOANNIS G. RAFTOYIANNIS ◽  
GEORGE T. MICHALTSOS
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Constant Velocity ◽  
Steel Beam ◽  
Continuum Approach ◽  
Theoretical Formulation ◽  
Modal Superposition ◽  
Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

Dynamic response of metallic lattice sandwich structures to impulsive loading

2012 ◽  
Vol 43 ◽  
pp. 1-5 ◽  
Author(s):  
Xiaodong Cui ◽  
Longmao Zhao ◽  
Zhihua Wang ◽  
Han Zhao ◽  
Daining Fang
Keyword(s):  
Dynamic Response ◽  
Sandwich Structures ◽  
Impulsive Loading

Impulsive Forming of Shell Structures With Apertures

2003 ◽  
Author(s):  
V. Sabelkin
Keyword(s):  
Dynamic Response ◽  
High Explosive ◽  
Impulsive Loading ◽  
Shell Structures ◽  
Plastic Properties ◽  
Aperture Diameter ◽  
Jet Engine ◽  
Explosive Charges ◽  
Explosive Forming ◽  
Static And Dynamic Loading

Different modern shell structures are exposed to impulsive loading very often. Some of them may have different imperfections such as apertures, welds, and irregular thickness. These structures can be made by static or impulsive loading. To know fractureless dynamic response of shell structures with apertures is important in many cases, especially for forming processes, because of the first appeared fracture can extend through a shell blank especially if material is brittle with low plastic properties. The tooling for impact and static loading of flat and shell structures was developed. Dynamic response of shell structures with unsupported apertures on internal impulsive loading by point high explosive charges is described. Strain state of shaped shell structures with apertures after explosive forming is shown. The limit aperture diameter for dynamic fractureless response is determined. Distributions of strain intensities on a sample cross section for different aperture diameters, static and dynamic loading are shown. Different jet engine parts were made using developed technology.

scholarly journals Research on Laterally Restrained Built Up Steel Beam Under Dynamic Response

2019 ◽  
Vol 8 (6S4) ◽  
pp. 1057-1061
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Mode Shape ◽  
Extraction Methods ◽  
Analytical Investigation ◽  
Mode Shapes ◽  
Linear Perturbation ◽  
Steel Beam ◽  
Finite Element Software ◽  
Eigen Value

This paper presents the analytical investigation of laterally restrained built up steel beam under dynamic response using finite element software ABAQUS. The main objective of this study was to estimate the mode shapes and mode shape curvature of the laterally restrained built up steel beam. The three parameters such as modal frequencies, mode shapes and mode shape curvature are suggested for identifying the damages in built up steel beam. Damage assessment is done by linear perturbation free vibration study using finite element software ABAQUS. The frequency extraction methods for built up steel beam was done in ABAQUS to get the dynamic response. The Lanczos eigen solver was used for finding the mode shapes. Eigen value extraction, the natural frequencies and the corresponding mode shapes of a system were studied

The estimate of dynamic response of spacecraft and launcher fragmentation system components under impulsive loading

2015 ◽  
Vol 21 (1(92)) ◽  
pp. 15-19 ◽  
Author(s):  
M.G. Shulzhenko ◽  
◽  
B.P. Zajtsev ◽  
P.P. Gontarovskyi ◽  
T.V. Protasova ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Impulsive Loading ◽  
System Components

The Dynamic Response of an Offshore Wind Turbine With Realistic Flexibility to Breaking Wave Impact

2011 ◽  
Author(s):  
Erik Jan de Ridder ◽  
Pieter Aalberts ◽  
Joris van den Berg ◽  
Bas Buchner ◽  
Johan Peeringa
Keyword(s):  
Dynamic Response ◽  
Wind Turbine ◽  
Breaking Waves ◽  
Impulsive Loading ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Breaking Wave ◽  
Extreme Waves ◽  
Wave Impact ◽  
Pilot Model

The effects of operational loads and wind loads on offshore monopile wind turbines are well understood. For most sites, however, the water depth is such that breaking or near-breaking waves will occur causing impulsive excitation of the monopile and consequently considerable stresses and displacements in the monopile, tower and turbine. To investigate this, pilot model tests were conducted with a special model of an offshore wind turbine with realistic flexibility tested in (extreme) waves. This flexibility was considered to be necessary for two reasons: the impulsive loading of extreme waves is very complex and there can be an interaction between this excitation and the dynamic response of the foundation and tower. The tests confirmed the importance of the topic of breaking waves: horizontal accelerations of more than 0.5g were recorded at nacelle level in extreme cases.

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