scholarly journals BASE SHEAR COEFFICIENT OF MEDIUM AND LOW-RISE STEEL STRUCTURE BASED ON ENERGY BALANCE FOR CONTINUOUS USE AFTER EARTHQUAKE

2021 ◽  
Vol 86 (784) ◽  
pp. 893-900
Author(s):  
Takuma HASHIMOTO ◽  
Tadashi TAMURA ◽  
Yuki FURUSHIMA ◽  
Shigenobu MORI ◽  
Taisuke MURAKI ◽  
...  
Keyword(s):  
Energy Balance ◽  
Steel Structure ◽  
Base Shear ◽  
Shear Coefficient ◽  
Continuous Use

Shake Table Testing of a Low Damage Steel Building with 2-4 Displacement Dependent (D3) Viscous Damper

2018 ◽  
Vol 763 ◽  
pp. 331-338
Author(s):  
Nikoo K. Hazaveh ◽  
Ali A. Rad ◽  
Geoffrey W. Rodgers ◽  
J. Geoffrey Chase ◽  
Stefano Pampanin ◽  
...  
Keyword(s):  
Viscous Fluid ◽  
Residual Deformation ◽  
Structural Response ◽  
Steel Structure ◽  
Experimental Tests ◽  
Base Shear ◽  
Moment Frame ◽  
Fluid Damper ◽  
Resistive Forces ◽  
Viscous Fluid Damper

To improve seismic structural performance, supplemental damping devices can be incorporated to absorb seismic response energy. The viscous fluid damper is a well-known solution. However, while they reduce displacement demand, they can increase overall base shear demand in nonlinear structures as they provide resistive forces in all four quadrants of force-displacement response. In contrast, Direction and Displacement Dependent (D3) viscous fluid dampers offer the opportunity to simultaneously reduce structural displacements and the total base-shear force as they only produce resistive forces in the second and fourth quadrants of a structural hysteresis plot. The research experimentally examines the response of a half-scale, 2-storey moment frame steel structure fitted with a 2-4 configuration D3 viscous fluid damper. The structure is also tested with conventional viscous dampers to establish a baseline response and enable comparison of results. Dynamic experimental tests are used to assesses the base shear, maximum drift and residual deformation under 5 different earthquakes (Northridge, Kobe, Christchurch (CCCC), Christchurch (CHHC), and Bam ground motion). Response metrics including base shear, the maximum structural displacement, and peak structural accelerations are used to quantify performance and to assess the response reductions achieved through the addition of dampers. It is concluded that only the 2-4 device is capable of providing concurrent reductions in all three of these structural response metrics.

Investigation on the Effect of Infilled Walls Utilizing Response Spectrum Analysis for Steel Staggered-Truss System

2012 ◽  
Vol 152-154 ◽  
pp. 34-39
Author(s):  
Qing Sheng Guo ◽  
Qing Shan Yang
Keyword(s):  
Spectrum Analysis ◽  
Earth Quake ◽  
Simulation Analysis ◽  
Response Spectrum ◽  
Steel Structure ◽  
3D Models ◽  
Structure Design ◽  
Seismic Load ◽  
Base Shear ◽  
Response Spectrum Analysis

Considering the structure type of the steel staggered-truss (SST) system, the effect of infilled walls will be major and need to be studied amply, some scientific design regulations need to be found for referrence. Based on two different 3D models considering or ignoring the stiffness of infilled walls (SIW), a numerical investigation is presented on the structural behaviors of the SST system utilizing the finite element 3D simulation analysis soft ware ETABS. The longitudinal structure is asymmetrical due to the SIW, it causes the torsion forces in the building. Comparing to the different results of response spectrum analysis, including storey drift and equivalent base shear under frequent earth quake and rare earth quake, some conclusions were made, including the capacity of the SST system under seismic load and the effect of the SIW for SST system. The increased base shear force factors due to the effect of the SIW were suggested for SST structure design, it is different from the other steel structure types.

scholarly journals Investigation of PTMD System Affected by Parkfield Near-Field Earthquake

2017 ◽  
Vol 11 (4) ◽  
pp. 70 ◽  
Author(s):  
Ali Vatanshenas
Keyword(s):  
Near Field ◽  
Structural Response ◽  
Time History ◽  
Steel Structure ◽  
Roof Displacement ◽  
Base Shear ◽  
Maximum Acceleration ◽  
Existing Structures ◽  
History Analysis ◽  
Reduction Methods

Earthquake is considered as the main destructive and collapsing factor of structures in near-fault zones, so design new structures and retrofitting existing structures in order to decrease structural responses is an unavoidable matter. One of the structural response reduction methods is using of TMDs. In this paper, a two-dimensional 10-storey steel structure as three structural models without PTMD, with a PTMD at the highest level and ten PTMDs with different characteristics at all levels with the Modal-FNA time-history analysis method under acceleration records with directivity and without directivity of Parkfield 2004 earthquake at the angle of the maximum acceleration response in the first mode period of structure after rotating the acceleration records at the station with directivity and its corresponding angle at the station without directivity were compared to each other in terms of the roof displacement, the input energy and the base shear. It was observed that the structure behavior in the case of using only one PTMD is better, but in the case where ten PTMDs with relative smaller masses were used compared to the case where only one PTMD was used is also with roof displacement reduction.

A decentralized response-dependent MR damper for controlling building structures excited by seismic load

2011 ◽  
Vol 22 (16) ◽  
pp. 1913-1927 ◽  
Author(s):  
Sang-Hyun Lee ◽  
Kyung-Jo Youn ◽  
Kyung-Won Min
Keyword(s):  
Frictional Force ◽  
Response Spectrum ◽  
Mr Damper ◽  
Steel Structure ◽  
Experimental Tests ◽  
Seismic Load ◽  
Building Structures ◽  
Control Performance ◽  
Base Shear ◽  
Mr Dampers

In this study, a decentralized algorithm for operating a semiactive MR damper was presented. The frictional force of the MR damper was determined based on the assumed shape functions using the displacement and velocity of the damper piston itself. The seismic response control performance of the MR damper was numerically and experimentally evaluated and compared to that of the passively or semiactively operated MR damper. The results from numerical analysis of SDOF system indicated that passively operated MR damper to have an optimal frictional force less than about 30% of the base shear force provided the smallest displacement response spectrum over all the periods. The proposed MR damper showed the better performance in reducing the absolute acceleration with the larger frictional force than the passive one. Also, the results from a three-storey benchmark building indicated that the proposed decentralized MR damper provided control performance equivalent to or better than the performance shown by the semiactive MR damper using a centralized LQR algorithm. Finally, the effectiveness of the proposed MR damper was verified through experimental tests of a full-scale five-storey steel structure with the MR dampers.

scholarly journals A note about base shear

1969 ◽  
Vol 2 (2) ◽  
pp. 171-175
Author(s):  
A. L. Andrews
Keyword(s):  
New Zealand ◽  
Seismic Analysis ◽  
Rational Method ◽  
Base Shear ◽  
Vibration Period ◽  
Shear Coefficient ◽  
Mode Vibration

Californian and Japanese seismic analysis rules have in common with New Zealand seismic rules a relation between the base shear coefficient and the prime mode vibration period. The prime mode period may be assessed by a rational method or it may be approximated.

scholarly journals A Comparative Study of Pre-Engineered and Conventional Multi-Span Industrial Building

2020 ◽  
Vol 10 (1) ◽  
pp. 59-67
Keyword(s):  
Construction Material ◽  
Limit State ◽  
Construction Materials ◽  
Steel Structure ◽  
Industrial Building ◽  
Modern World ◽  
Base Shear ◽  
Actual Structure ◽  
Analysis And Design ◽  
Building Inventory

Steel is one of the oldest construction materials and become a popular construction material in late seventeenth and eighteenth century. Environment friendly, rapid construction, easy availability and better fire rating are some of inherent advantages of steel construction. In current modern world, steel structure contributes a highest number of industrial buildings and sheds in the world building inventory. Pre-Engineered Building concept involves the steel building systems which are predesigned and prefabricated. This particular study includes the design of industrial storage structure which is situated in Mangalore. The actual structure is of pre-engineered structure of 90m width of three spans each span 30m width, and running 42m length and of eave height 6m with roof slope 1:10. The analysis and design is carried out by considering the live loads, dead loads, wind loads and earthquake load using relevant IS codes for the given PEB structure. The whole Pre-engineered building and Conventional steel structure is analyzed by using staad pro V8i SS6 software and designed by limit state method as per IS 800-2007. The moment, shear force and axial force decreases in PEB structure in various components as compared to CSB structure, due to increase in stiffness. Deformation decreases in PEB structure in various components as compared to CSB structure, due to increase in stiffness. Base shear and displacement decreases in PEB structure as compared to CSB structure, due to increase in stiffness. The percentage decrease in weight in PEB structure is 16.28% in comparison to CSB structure, hence cost of PEB structure reduces. Reduction in steel quantity reduces the dead load ultimately reduces the size of the foundation

Research of Seismic Effect for Light Steel Structure with Added Stories

2014 ◽  
Vol 1030-1032 ◽  
pp. 838-842
Author(s):  
Pei Cheng Wu ◽  
Xue Qing Tang ◽  
Shou Cai Ma
Keyword(s):  
Theoretical Analysis ◽  
Safety Factor ◽  
Steel Structure ◽  
Seismic Effect ◽  
Seismic Action ◽  
Existing Buildings ◽  
Base Shear ◽  
Magnification Factor ◽  
Action Effect ◽  
Dynamic Magnification Factor

Light steel structure with added stories is a economic and effective method of strengthening design for existing buildings, and it is promoted and applied widely. But it still has some problems about computing of seismic action effect. The computing is not simply in accordance with the base shear method. The value of dynamic magnification factor which was counted as ß needs further research. In this paper, the value of is 2 on the basis of theoretical analysis and calculation example. The safety factor of the value is higher, and the design with the ß is more economic and reasonable.

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