scholarly journals Seismic Performance of Steel Framed Building With Mass Irregularities With The Use of Different Combinations of Base Isolators and Dampers

2021 ◽  
pp. 636-643
Author(s):  
Yatri K. Thakkar ◽  
Mrs. Noopur Shah
Keyword(s):  
Linear Time ◽  
Time History ◽  
Steel Frame ◽  
Friction Damper ◽  
Frame Building ◽  
First Case ◽  
Lead Rubber Bearing ◽  
Irregular Buildings ◽  
Ground Motion Records ◽  
Base Isolators

This study addresses the nonlinear seismic responses of 3D Steel frame building upgraded with a series of passive protective systems. To this, friction damper (FD) as an energy dissipation device and lead rubber bearing (LRB), and friction pendulum bearing (FPB) base isolators are considering. For this purpose, eight different cases are taken into account. The first case contains a ten-story steel frame regular compare with irregular buildings (mass irregularities) as fixed-base (FB), the other four cases are the single use of FD, LRB and FPB in such frame, and the last three cases are the combined use of FD with LRB and FPB, Combination of isolators LRB and FPB, Combination of LRB, FPB and FD. Above same cases are considering for fifteen story steel frame regular buildings compare with irregular buildings (mass irregularities). Two ground motion records considering in this study by non-linear time history analysis in ETABS.

Seismic performance of Greater Jakarta LRT with added lead rubber bearing using non-linear time history analysis

2021 ◽  
Author(s):  
Iswandi Imran ◽  
Marie Hamidah ◽  
Tri Suryadi ◽  
Hasan Al-Harris ◽  
Syamsul Hidayat
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Performance Level ◽  
Structural Performance ◽  
Isolation System ◽  
Rubber Bearing ◽  
Lead Rubber Bearing ◽  
History Analysis ◽  
Seismic System

<p>In order to overcome stringent seismic requirement in the new Greater Jakarta Light Rail Transit Project, a breakthrough seismic system shall be chosen to obtain expected structural performance. This seismic system shall be designed to provide operational performance level after strong earthquake events. To achieve the criteria, seismic isolation system using Lead Rubber Bearings is chosen. With this isolation system, Greater Jakarta LRT has become the first seismically isolated infrastructure and apparently an infrastructure with the largest numbers of LRBs in one single project in Indonesia. More than 10.400 Pcs LRBs are used for the first phase of the construction and the numbers will be certainly increased in the next phase of the construction. To evaluate the structural performance, non-linear time history analysis is used. A total of 3 pair matched ground motions will be used as the input for the response history analysis. The ability of the lead rubber bearing to isolate and dissipate earthquake actions will determine its structural performance level. This will be represented by the nonlinear hysteretic curves obtained throughout the earthquake actions.</p>

scholarly journals Effectiveness of fluid viscous damper for steel frame building subjected to earthquake load

2021 ◽  
Vol 263 ◽  
pp. 03015
Author(s):  
Thanh Binh Pham ◽  
Ngoc Quang Vu
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Steel Frame ◽  
Frame Structure ◽  
Seismic Load ◽  
Viscous Damper ◽  
Maximum Displacement ◽  
Fluid Viscous Damper ◽  
Frame Building ◽  
Earthquake Load

Since the appearance of the first modern multistories buildings, besides the demand of ensuring the bearing capacity, one of the urgent problems facing the engineer is to do how to design structure to ensure the requirements of normal use such as displacement, motion acceleration within permissible limits. There exist many methods to reduce these response of structure under lateral load. Among these, using fluid viscous damper (FVD) is one of the most applied equipment because of its simplicity. This paper presents the examination of eight-story steel frame structure subjected to seismic load. The FVD system is defined in Etabs with link properties. In each story, four dampers are located in each direction of plan, with two on each side of the center of stiffness of the story. The time history analysis was conducted to study the structure subjected to seimic load collected from the function library of program Etabs. The effect of FVD system was determined by the dynamic response of the building and displacement indexes such as maximum displacement of roof, story drift ratio. The results show that, all the dynamic response characters of structure were decreased significantly when providing the FVD to it.

The Damping Energy Dissipation Study on Buckling Restrained Brace in Multilayer Steel Frame

2010 ◽  
Vol 160-162 ◽  
pp. 910-914
Author(s):  
Yun Peng Chu ◽  
Yong Yao ◽  
Bin Xu ◽  
Yong Jun Deng ◽  
Shu Lian Xiao
Keyword(s):  
Energy Dissipation ◽  
Linear Time ◽  
Time History ◽  
Steel Frame ◽  
Structure Stability ◽  
Finite Element Software ◽  
Buckling Restrained Brace ◽  
History Analysis ◽  
Multilayer Steel ◽  
Brace Frames

The buckling-restrained brace has stable energy dissipation capability. It has been widely used in recent years. This paper uses finite element software ANSYS to do non-linear time history analysis for Center Braced Steel Frame, Eccentrically Braced Steel Frame, Buckling-restrained Braced Steel Frame under the earthquake. The results show that: (1) The peak acceleration, residual displacement and top floor displacement of buckling-restrained braced steel frame is smaller than the other two brace frames, provide support for the structure stability. (2) The damping energy and bracing energy dissipation capability of buckling-restrained braces and eccentrically braced are strong, so it can avoid the collapse of the main structure under the large or medium earthquake.

scholarly journals Effect of the Improved Pall Friction Damper on the Seismic Response of Steel Frames

2017 ◽  
Vol 7 (4) ◽  
pp. 1833-1837 ◽  
Author(s):  
P. H. Sarjou ◽  
N. Shabakhty
Keyword(s):  
Seismic Response ◽  
Linear Time ◽  
Steel Frames ◽  
Time History ◽  
Friction Damper ◽  
Base Shear ◽  
Absorbed Energy ◽  
Steel Bracing ◽  
History Analysis ◽  
Energy Absorbing

Energy-absorbing dampers are used to reinforce structures which are vulnerable to earthquakes. This study evaluates the performance of Improved Pall Frictional Dampers (IPFD) which is a type of Pall Frictional Damper (PFD). For this purpose, this study compares the performances of steel frames with concentric steel bracing reinforced by IPFD and steel frames with concentric steel bracing with no damper. Frames with different stories and pans were modelled in sap2000 and exposed to accelerograms of earthquakes for non-linear time history analysis. Results of analysis were studied; parameters such as story displacement, base shear and absorbed energy were compared in steel frames with damper and without damper.

scholarly journals Seismic Vulnerability Assessment of Portuguese Adobe Buildings

Buildings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 200
Author(s):  
Samar Momin ◽  
Holger Lovon ◽  
Vitor Silva ◽  
Tiago Miguel Ferreira ◽  
Romeu Vicente
Keyword(s):  
Structural Damage ◽  
Seismic Vulnerability ◽  
Linear Time ◽  
Time History ◽  
Building Stock ◽  
Seismic Vulnerability Assessment ◽  
Ground Shaking ◽  
Brittle Behavior ◽  
Historical Significance ◽  
Ground Motion Records

Adobe construction represents 5.3% of the total Portuguese building stock according to the latest National Housing Census. The distribution of these adobe buildings is scattered across the country, with higher density in the central region and in Algarve in the south, where the seismic hazard is highest. A large proportion of these buildings are still in use for residential and commercial purposes and are of historical significance, contributing to the cultural heritage of the country. Adobe buildings are known to exhibit low seismic resistance due to their brittle behavior, thus making them vulnerable to ground shaking and more prone to structural damage that can potentially cause human fatalities. Three buildings with one-story, two-stories, and two-stories plus an attic were numerically modeled using solid and contact elements. Calibration and validation of material properties were carried out following experimental results. A set of 30 ground motion records with bi-directional components were selected, and non-linear time-history analyses were performed until complete collapse occurred. Two novel engineering demand parameters (EDPs) were used, and damage thresholds were proposed. Finally, fragility and fatality vulnerability functions were derived. These functions can be used directly in seismic risk assessment studies.

scholarly journals Seismic Behavior of LRB and FPS Type Isolators Considering Torsional Effects

2021 ◽  
Author(s):  
Esra Ozer ◽  
Mehmet Inel ◽  
Bayram Tanik Cayci
Keyword(s):  
Ground Motion ◽  
Seismic Behavior ◽  
Time History ◽  
Nonlinear Behavior ◽  
Shear Walls ◽  
Rc Frame ◽  
Structural Members ◽  
Earthquake Records ◽  
Frame Building ◽  
Ground Motion Records

Abstract This study aims to investigate seismic behavior of LRB and FPS type base isolated models considering torsional irregularity due to distance between stiffness center of isolators and mass center of superstructure for low- and mid-rise reinforced concrete (RC) frame buildings with no shear walls. Nonlinear behavior of structural members was also considered to be able to observe probable yielding of structural members in superstructure due to the torsional irregularity. 528 different nonlinear time history analyses of 3-dimensional 3, 5, 7 and 9-story models subjected to 11 pairs of earthquake records were performed. The results indicate that FPS type isolators tend higher displacement demands while LRB type isolators are more sensitive to torsional effects. Torsional irregularity coefficient values of LRB models with 20% eccentricity are 47% higher than symmetrical models in terms of averages. Since significant part of the demands is absorbed by the isolator system, the remaining seismic demands for the superstructure is relatively low. Besides, the outcomes underline the careful selection of number of ground motion records in dynamic analysis as mentioned in the literature. While some studies in the literature indicate that torsional effects due to 10% or 20% eccentricity have significant role on building response, they used very limited building models subjected to a few earthquake records. The use of four different RC frame building model with LRB and FPS type isolators subjected to 11 pairs of ground motion records do not strongly support the abovementioned studies in literature. Therefore, more research is needed in this field.

scholarly journals Structural Control Using LRB in Irregular Building

2021 ◽  
pp. 136-156
Author(s):  
Aamir A. Mansuri ◽  
Vishal B. Patel ◽  
Chetan Machhi
Keyword(s):  
Associate Degree ◽  
Structural Control ◽  
Base Isolation ◽  
Linear Time ◽  
Time History ◽  
Structural Vibration ◽  
Management Technique ◽  
Base Shear ◽  
Loma Prieta Earthquake ◽  
Lead Rubber Bearing

Earthquakes are measure as one of all nature’s greatest hazards; throughout the historic time they need to cause important loss of life and severe harm to property, particularly to man-made structures. On the opposite hand, earthquakes offer architects and engineers a variety of vital criteria foreign to the traditional style method. during this analysis paper study, base isolation as an associate degree earthquake resisting style technique was used that well dissociate a construction from its substructure and increase flexibility resisting on the bottom vibration areas by providing the isolators. Lead rubber bearing (LRB) isolator could be a passive structural vibration management technique. during this analysis study, unstable behavior of irregularity building in the simple model, re-entrant corner plan irregular model, mass irregular model, and stiffness irregular model are measure configurations with varied frame sections with and while not LRB base isolation was analyzed for the comparative analysis on the idea of base shear, storey shear, stoery displacement, storey drift and storey acceleration with 3 earthquake information, first is Bhuj earthquake, second is Kobe Japan earthquake, and third is Loma Prieta earthquake analysis is done by E-TABS 18.0.20software. Non-linear time history analysis and for design purpose of a base-isolated system and for seismic design of isolated structure consistent with IS 1893 (part 1):2016 and UBC 1997.

scholarly journals Seismic Performance of Damper Installed In High-Rise Steel Building In Bangladesh

2018 ◽  
Vol 9 (1) ◽  
pp. 1-12
Author(s):  
T. Tabassum ◽  
K.S. Ahmed
Keyword(s):  
Linear Time ◽  
Time History ◽  
Time History Analysis ◽  
Friction Damper ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
High Rise ◽  
History Analysis ◽  
Steel Building ◽  
Joint Acceleration

This research paper describes the results of analysis of the seismic behavior of a thirty story steel building with and without damper under different earthquake acceleration signals. The proposed procedure placed the various types of damper like friction damper, bilinear damper and exponential damper on the top three floors of the building. The study compares the different performances such as the joint displacement, joint acceleration, the base force of structure with and without damper for a thirty-story steel building using ETAB2015. The study further performs time history analysis for different seismic accelerograms to observe the actual time domain responses of the structure. Linear time-history analysis on this steel building structure indicates that maximum displacement, maximum base force, and maximum acceleration effectively reduce in the presence of damper at top three floors of the building.

scholarly journals Minimization of Torsional Parameters in Dual Asymmetrical Building through Proper Configuration of Centres

2020 ◽  
Vol 8 (5) ◽  
pp. 5426-5433
Keyword(s):  
Linear Time ◽  
Angular Acceleration ◽  
Time History ◽  
Lateral Load ◽  
Early Research ◽  
The Core ◽  
Basic Model ◽  
Gravitational Loading ◽  
History Analysis ◽  
Irregular Buildings

Columns are the core lateral load resisting elements in the buildings which do not have any other forms of resisting components. The sectional dimensions of the columns are often judge based upon the gravitational loading or a combined effect of gravitational and lateral loading on the structure. As per the early research on irregular buildings, they are highly vulnerable for damage when subjected to lateral forces (seismic/wind) when compared to regular shaped buildings, due to the presence of torsional forces. It has also been proved that these torsional forces are generated due to structural eccentricities of the system. The centres of stiffness and strength are predominantly dependent upon the configuration of the lateral load resisting elements. In this study, the effect of proper configuration of column’s dimensions on torsional parameters of irregular buildings is carried out. Non-linear Time History analysis on Plan irregular building with dual asymmetry is performed using scaled acceleragrams and the torsional parameters such are diaphragm’s rotation, torsional irregularity ratio, angular acceleration of the diaphragm are compared with the basic model.

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