Non-linear FEM analysis of earthquake-induced pounding between the main building and the stairway tower of the Olive View Hospital

2009 ◽  
Vol 31 (8) ◽  
pp. 1851-1864 ◽  
Author(s):  
Robert Jankowski
Keyword(s):  
Fem Analysis ◽  
Main Building ◽  
Non Linear

Assessment of Damage Due to Earthquake-Induced Pounding between the Main Building and the Stairway Tower

2007 ◽  
Vol 347 ◽  
pp. 339-344 ◽  
Author(s):  
Robert Jankowski
Keyword(s):  
Reinforced Concrete ◽  
Fem Analysis ◽  
Layered Material ◽  
Reinforced Concrete Structures ◽  
Material Behaviour ◽  
Main Building ◽  
Structural Interactions ◽  
Non Linear ◽  
San Fernando ◽  
Linear Material

The reports after earthquakes indicate that earthquake-induced pounding between insufficiently separated structures, or their parts, may cause substantial damage or even lead to structural collapse. One of the most spectacular example of pounding-involved destruction resulted from interactions between the Olive View Hospital main building and one of its independently standing stairway towers during the San Fernando earthquake of 1971. The aim of the present paper is to assess the range and intensity of damage caused by collisions between these reinforced concrete structures based on the results of a detailed 3D non-linear FEM analysis of poundinginvolved response. In the study, reinforced concrete has been modelled as layered material with rebar elements embedded into concrete. The non-linear material behaviour, including stiffness degradation of concrete due to damage under cyclic loading, has been incorporated in the numerical model. The results of the study show that pounding may lead to the significant increase of the range and intensity of damage at the base of the stairway tower, as a lighter structure, as well as may cause substantial damage at the points of contact. On the other hand, the intensity of damage induced in the heavier main building has been found to be nearly unaffected by structural interactions.

Design and FEM analysis of pentagonal photonic crystal fiber for highly non-linear applications

2020 ◽  
Vol 52 (10) ◽  
Author(s):  
Raisa Mamtaz ◽  
Kawsar Ahmed ◽  
Bikash Kumar Paul ◽  
Md. Aslam Mollah ◽  
Mst. Nargis Aktar ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Fem Analysis ◽  
Crystal Fiber ◽  
Non Linear

Damage-Involved Response of Two Colliding Buildings under Non-Uniform Earthquake Loading

2013 ◽  
Vol 577-578 ◽  
pp. 197-200
Author(s):  
Robert Jankowski
Keyword(s):  
Ground Motion ◽  
Seismic Wave ◽  
Damage Model ◽  
Fem Analysis ◽  
Stochastic Modelling ◽  
Earthquake Loading ◽  
Non Linear ◽  
San Fernando ◽  
The Difference ◽  
Ground Motion Records

Pounding between insufficiently separated buildings, which may result in considerable damage or may even lead to the total collapse of colliding structures, has been repeatedly observed during earthquakes. Earthquake-induced collisions of buildings has been intensively studied applying various structural models. It was assumed in the analyses, however, that the seismic excitation is identical for all structural supports; whereas, in the reality, the ground motion differs from place to place due to spatial seismic effects connected with propagation of the seismic wave. The aim of the present paper is to conduct a detailed non-linear damage-involved analysis of pounding between two structures under non-uniform earthquake loading. A case of pounding between the Olive View Hospital main building and one of its stairway towers, observed during the San Fernando earthquake of 1971, has been considered in the study. In the numerical FEM analysis, non-linear material properties have been simulated using stiffness degradation (due to damage under cyclic loading) model of concrete and elastoplastic damage model of reinforcing steel. A method of conditional stochastic modelling has been used to generate the input ground motion records. The results of the study indicate that the incorporation of the non-uniform ground motion excitation may lead to substantial change of pounding-involved response of the structures. The difference between the uniform and non-uniform responses has been found to be relatively large considering the fact that the variation in the simulated input ground motion records was rather small. This shows the importance of incorporation in the damage-involved numerical analysis the effects connected with propagation of the seismic wave.

Simulation of Crack Dynamic Characteristics of Rotor Based on FEM Analysis

2010 ◽  
Vol 139-141 ◽  
pp. 2677-2680
Author(s):  
Kang Yang ◽  
Yi Yang
Keyword(s):  
Dynamic Characteristics ◽  
Dynamic Equation ◽  
Fem Analysis ◽  
Simulation Method ◽  
Disk Center ◽  
Wave Crest ◽  
Cracked Rotor ◽  
Element Analysis ◽  
Stiffness Characteristic ◽  
Non Linear

A new simulation method is proposed for dynamic characteristics of cracked rotor based on the finite element analysis, in which the stiffness model has been derived for the exact description of variation rules of cracked shafts. A non-linear dynamic equation is constituted according to stiffness characteristic of cracked-rotor change in time domain. Then the corresponding dynamic equation of the cracked rotor based on FEM analysis is modeled and the numerical simulation is carried out with solutions of high accuracy. At last, the dynamic characteristics of cracked rotor in diverse conditions are analyzed, and the simulation results are compared. It is shown that the non-linear oil film bearing force coupling with periodicity variety stiffness of cracked rotor has a great effect on dynamic behavior of the rotor and that the cracked rotor can be diagnosed effectively by the criterion that the swing of disk center obviously accretes and the wave crest appears when rotation speed is a half critical speed of rotor shaft system.

Fem Analysis of Non-Linear, Anisotropic Permanent Magnets

2005 ◽  
Author(s):  
F. Caricchi ◽  
F. Crescimbini ◽  
A. Di Napoli ◽  
E. Santini
Keyword(s):  
Permanent Magnets ◽  
Fem Analysis ◽  
Non Linear

Non-Linear FEM Analysis of the Trunnion Suspension System

1991 ◽  
Author(s):  
Naoshi Satoh ◽  
Tetsuya Sakai ◽  
Mamoru Aida
Keyword(s):  
Fem Analysis ◽  
Suspension System ◽  
Non Linear
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