scholarly journals MATERIAL DAMPING IN DYNAMIC ANALYSIS OF STRUCTURES

1970 ◽  
Vol 13 (3) ◽  
pp. 13-18
Author(s):  
Мaria S. Barabash ◽  
Anatol V. Pikul
Keyword(s):  
Significant Influence ◽  
Physical Meaning ◽  
Strain State ◽  
Dynamic Loads ◽  
Newmark Method ◽  
Material Damping ◽  
Motion Equations ◽  
Earthquake Loads ◽  
Loads Analysis ◽  
Numerical Research

Abstract: The paper deals with numerical research as to how material damping influences the load-bearingstructures in dynamic loads. Certain technique is suggested for modelling behaviour of structure in time historyanalysis with account of material damping. A set of motion equations is solved according to Newmark method asmatrix. Physical meaning of material damping is described. The authors suggest the technique for account ofdifferent materials in parts of structure. The following example is provided: analysis of structure together withsoil and with account of earthquake loads. Analysis results are compared (with and without account of materialdamping). Significant influence of damping on the stress-strain state of the structure is confirmed.

scholarly journals ANALISIS GAYA GEMPA PADA BANGUNAN RUMAH TINGGAL DI WILAYAH GEMPA TINGGI

2018 ◽  
Vol 7 (2) ◽  
pp. 57-64
Author(s):  
Alfian Wiranata Zebua
Keyword(s):  
Structural Analysis ◽  
Shear Force ◽  
Structure Model ◽  
Dynamic Shear ◽  
Earthquake Loads ◽  
Story Drift ◽  
Loads Analysis ◽  
Support Reactions ◽  
Static Shear

Abstract : Four stories building was used as structure model. Static earthquake loads distribution were determined according to SNI 1726:2012. The effect of dynamic earthquake loads also considered. The result of structural analysis determined using ETABS. It were static shear force 1.082,64 KN and dynamic shear force, Fx = 1.057 KN and Fy = 983,5 KN. Colomn and beam forces were also determined. Support reactions and joint displacements were determined through structural analysis. Mass modal participation has been reached over 90% at mode 5. Story drift was still smaller than the allowable story drift.Keywords : earthquake loads analysis, residential building.Abstrak:Model struktur yang dianalisis yaitu gedung beraturan lantai 4 untuk rumah tinggal. Distribusi beban gempa statik diperoleh sesuai dengan SNI 1726:2012. Pengaruh beban gempa dinamik juga diperhitungkan. Hasil analisis struktur diperoleh antara lain besaran gaya geser statik 1.082,64 KN dan gaya geser dinamik, Fx = 1.057 KN dan Fy = 983,5 KN. Besaran gaya elemen kolom dan balok juga diperoleh. Reaksi tumpuan serta perpindahan titik buhul dapat diketahui dari hasil analisis yang dilakukan. Pada mode 5, partisipasi massa model yang dianalisis sudah mencapai 90%.Simpangan antar lantai yang terjadi pada model struktur tidak melebihi simpangan yang diijinkan.Kata kunci : analisis gaya gempa, bangunan rumah tinggal.

scholarly journals Stress-strain state of brickwork under the action of static and dynamic loads

2019 ◽  
Vol 9 (1) ◽  
pp. 38-49
Author(s):  
Ilya N. Arkhipov ◽  
◽  
Vladimir I. Palagushkin ◽  
Nikolay I. Marchuk ◽  
Inna Ya. Petukhova ◽  
...  
Keyword(s):  
Strain State ◽  
Dynamic Loads ◽  
Stress Strain ◽  
Stress Strain State ◽  
Static And Dynamic Loads

scholarly journals The behaviour of roof gable walls under the effect of earthquake load

2010 ◽  
Vol 10 (2) ◽  
pp. 251-263 ◽  
Author(s):  
M. Kamanli ◽  
F. S. Balik
Keyword(s):  
Dynamic Load ◽  
Shaking Table ◽  
Dynamic Loads ◽  
Roof System ◽  
Earthquake Loads ◽  
Research Department ◽  
Earthquake Research ◽  
Earthquake Load

Abstract. In this study, the effect of earthquake loads on roof gable walls and the behaviours of these roof gable walls are investigated. In preparation of the study, two experiments on cradle roof system which gets and does not get any loads off the roof members were carried out in all. The experiments were performed on the shaking table in Earthquake Research Department of General Directorate of Disaster Affairs. Through the experiments, some considerable results were obtained on the behaviours of roof gable walls under the effect of horizontal dynamic loads. The results obtained at the end of these examinations are given and discussed. Furthermore, suggestions to make the brick gable walls more reliable against the loads of earthquake are given. When the results of the experiments were generally taken into consideration, it was realized that the gable walls in both roof systems would partly or completely collapse even under the effect of a little horizontal dynamic load.

scholarly journals Numerical research of horizontally weighted bases from hollow circular piles with the reduced step

2016 ◽  
Vol 4 (2) ◽  
pp. 0-0
Author(s):  
Светлана Ямаева ◽  
Svetlana Yamaeva ◽  
Олег Денисов ◽  
Oleg Denisov
Keyword(s):  
Comparative Analysis ◽  
Computational Model ◽  
Numerical Simulations ◽  
Numerical Investigation ◽  
Strain State ◽  
Full Scale ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Research ◽  
Full Scale Tests

The results of numerical investigation of the stress-strain state of subgrade groups of hollow circular piles with diameters of less than three step under the action of horizontal loads. Shows the effect of pitch on piles move horizontally loaded the bases and a comparative analysis of the nature of their work with full-scale tests and numerical simulations. Pseudoplane used computational model of the foundation for the theory of local deformations and linearly deformable half.

scholarly journals DETERMINATION OF RUPTURE SOURCES OF TURBINE BLADE PACKETS AT PERFORMANCE OF FORENSIC EXAMINATIONS

2017 ◽  
Vol 17 ◽  
pp. 297-307
Author(s):  
A. V. Rusanov ◽  
G. Yu. Martynenko ◽  
K. V. Avramov ◽  
V O. Varlahov ◽  
V. G. Martynenko
Keyword(s):  
Gas Dynamics ◽  
Strain State ◽  
Turbine Blades ◽  
Dynamic Strength ◽  
Dynamic Loads ◽  
Applied Physics ◽  
Stress Strain ◽  
Bladed Disk ◽  
Stress Strain State ◽  
Gas Dynamic

The technique ofdetermination of rupture sources of the turbine blades packets, which can be used at performance of forensic expertise is suggested. Its distinctive feature is completeness of the account of the various factors concerning different areas of the applied physics, such as gas dynamics, heat conductivity, thermoelasticity, static and dynamic strength. The following series of calculations was made for acknowledgement of rupture sources of bladed disk. I. Calculation of a viscous compressed subsonic current. II. Calculation periodic gas-dynamic loads operating on the blades. III. Calculation of a non-stationary stress-strain state of the bladed disk under the action of periodic forces. The technique is based on use of the numerical methods of gas dynamics and dynamic strength. The steam current through a turbomachine step calculated with the help of model of the viscous, compressedfluid. The forced vibrations of the bladed disk under the action of the aerodynamic loads are analyzed by the numerical integration of the nonlinearfinite elements design model. Four cases are considered for the numerical calculations of the stress-strain state. I. The clearance in the disk slots are not accounted and the vibrations under the action ofgas-dynamic loads from ideal directing device are investigated. II. The clearance in the disk slots are not accounted and the vibrations under the action of gas- dynamic loads from defective directing device are investigated. III. The clearance in the disk slots are taken into account and the vibrations under the action of gas-dynamic loads from ideal directing device are investigated. IV. The clearance in the disk slots are taken into account and the vibrations under the action of gas-dynamic loads from defective directing device are investigated. It’s established that a source of rupture ofworking blades of a regulating step of a compartment of a high pressure of the steam turbine is damage of blades of the directing device.

scholarly journals Strength resistance of reinforced concrete elements of high-rise buildings under dynamic loads

2018 ◽  
Vol 33 ◽  
pp. 02049 ◽  
Author(s):  
Mikhail Berlinov
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Load Capacity ◽  
Phenomenological Theory ◽  
Dynamic Loads ◽  
Successive Approximations ◽  
Step Method ◽  
High Rise ◽  
The Finite Difference Method ◽  
Concrete Elements

A new method for calculating reinforced concrete constructions of high-rise buildings under dynamic loads from wind, seismic, transport and equipment based on the initial assumptions of the modern phenomenological theory of a nonlinearly deformable elastic-creeping body is proposed. In the article examined the influence of reinforcement on the work of concrete in the conditions of triaxial stress-strain state, based on the compatibility of the deformation of concrete and reinforcement. Mathematical phenomenological equations have been obtained that make it possible to calculate the reinforced concrete elements working without and with cracks. A method for linearizing of these equations based on integral estimates is proposed, which provides the fixation of the vibro-creep processes in the considered period of time. Application of such a technique using the finite-difference method, step method and successive approximations will allow to find a numerical solution of the problem. Such an approach in the design of reinforced concrete constructions will allow not only more fully to take into account the real conditions of their work, revealing additional reserves of load capacity, but also to open additional opportunities for analysis and forecasting their functioning at various stages of operation.

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