scholarly journals CORRELATION BETWEEN INTENSITY MEASURE PARAMETERS OF GROUND MOTION EARTHQUAKES AND STRUCTURAL RESPONSE OF MOMENT RESISTING STEEL FRAMES

2020 ◽  
Vol 32 (3) ◽  
Author(s):  
Emad Ali Elhout
Keyword(s):  
Ground Motion ◽  
Pearson Correlation ◽  
Steel Frames ◽  
Structural Response ◽  
Time History ◽  
Base Shear ◽  
Intensity Measure ◽  
Response Parameter ◽  
Drift Ratio ◽  
Moment Resisting

Identify and select a suitable ground motion intensity measure (IMs) parameters associated with the structural response to specific levels of damages or collapse in structures are very important in the seismic response of structural analyses. This paper investigated the correlation between 25 intensity measure (IMs) parameters of earthquakes and the structural response parameters of 3-, 6- and 12-story moment resisting steel frames (MRSFs). Nonlinear time history analyses are performed for these frames under near- and far-source ground motion records. The maximum story drift ratio (MSDR), the roof drift ratio (RDR), and the maximum base shear force (SF) are chosen as the structural response parameters. The Pearson correlation coefficient with the regression analyses is utilized to display the correlation between the structural response parameter and the ground motion IMs parameters. The results reveal that MSDR appears to be a suitable engineering demand parameter to correlate with most of the ground motion IMs parameters compared to both the RDR and the SF parameters. Also, Max. Incremental velocity (MIV) parameter is considered as the highest correlated IMs parameters with MSDR in both near- and far-source earthquakes.

scholarly journals Steel Frames Exposed to Severe Ground Motions: Use of Viscous Dampers and Buckling Restrained Braces to Dissipate Earthquake Induced Energy

2021 ◽  
Author(s):  
Osman Hansu ◽  
Esra Mete Guneyisi
Keyword(s):  
Steel Frames ◽  
Structural Response ◽  
Time History ◽  
Base Shear ◽  
Viscous Dampers ◽  
Finite Element Program ◽  
Buckling Restrained Braces ◽  
Interstorey Drift ◽  
Element Program ◽  
Nonlinear Time History

This study addresses an alternative use of viscous dampers (VDs) associated with buckling restrained braces (BRBs) as the innovative seismic protection devices. For this, 4, 8 and 12 storey steel frames were designed with 6.5 m equal span length and 4 m storey height. Thereafter, the VDs and BRBs were placed over the height of each frame considering three different configurations. The structures were modeled using SAP2000 finite element program and evaluated by the nonlinear time history analyses subjected to the six natural accelerograms (1976 Gazlı, 1978 Tabas, 1987 Superstition Hills, 1992 Cape Mendocino, 1994 Northridge and 1999 Chi-Chi). The structural response of the structures with and without VDs and BRBs were studied in terms of variation in the displacement, interstorey drift, absolute acceleration, maximum base shear, time history of roof displacement. The results clearly indicated that the application of VDs and BRBs had remarkable improvement in the earthquake performance of the case study frames by reducing the local/global deformations in the main structural systems and satisfied the serviceability.

scholarly journals Seismic Upgrading of Steel Moment-Resisting Frames by Means of Friction Devices

2014 ◽  
Vol 8 (1) ◽  
pp. 289-299 ◽  
Author(s):  
Esra Mete Güneyisi ◽  
Mario D'Aniello ◽  
Raffaele Landolfo
Keyword(s):  
Structural Response ◽  
Time History ◽  
Seismic Behaviour ◽  
Steel Moment Resisting Frames ◽  
Residual Drift ◽  
Moment Resisting Frames ◽  
Drift Ratio ◽  
Nonlinear Time History Analyses ◽  
Moment Resisting ◽  
Nonlinear Time History

In recent decades, several passive energy dissipation systems have been conceived in order to minimize the damage in structural and non-structural components of either new or existing buildings. In this study, the use of friction damped tension-compression diagonal braces for seismic upgrading of a steel moment resisting frames is investigated. To this aim, nonlinear time history analyses have been carried out on a set of representative frames with and without friction damped braces. In the nonlinear time history analyses, two sets of natural accelerograms compatible with seismic hazard levels of 10% and 2% probability of exceedance in 50 years have been considered. Under these records, the structural response has been comparatively investigated in terms of the maximum inter-storey drift ratio, maximum storey acceleration, residual drift ratio and displacement demand for the friction device. The results clearly highlighted that the application of friction damped braces allows reducing the damages to the main structural elements, thus significantly improving the seismic behaviour of the frame.

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.

scholarly journals KINERJA STRUKTUR BANGUNAN CANDI SIWA MENGGUNAKAN METODE ANALISIS RESPONSE SPECTRUM DAN TIME HISTORY

Konstruksia ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 144
Author(s):  
Andina Prima Putri ◽  
Reza Ranjani Yazid
Keyword(s):  
Response Spectrum ◽  
Time History ◽  
Base Shear ◽  
Drift Ratio ◽  
Immediate Occupancy

Candi Siwa merupakan salah satu candi yang terdapat di kompleks Candi Prambanan yang terletak di perbatasan Yogyakarta dan Jawa Tengah. Candi Siwa mengalami kerusakan akibat gempa pada tahun 2006, setelahnya dilakukan kegiatan rehabilitasi pada Candi Siwa berupa perkuatan kolom, balok dan pelat beton bertulang. Adanya perkuatan yang diberikan pada Candi Siwa, maka perlu diketahui bagaimana kekuatan struktur tersebut apabila diberi beban gempa. Pada penelitian ini menggunakan analisis response spectrum dan analisis time history. Pembebanan yang diberikan dalam analisis mengacu pada SNI 1726:2019 dan SNI 1727:2013. Berdasarkan hasil analisis menggunakan program bantu, didapatkan nilai base shear adalah 38213,296 ton. Displacement arah X terbesar terjadi pada Undak IV sebesar 39,54 mm dan displacement terbesar arah Y terjadi pada Undak IV sebesar 25,6 mm. Nilai drift maksimum yang terjadi pada Candi Siwa, pada arah X sebesar 0,00459 m pada Kaki I, sedangkan pada arah Y sebesar 0,00551 m terjadi pada Kaki I. Untuk level kinerja struktur Candi Siwa berdasarkan nilai drift ratio pada arah X dan arah Y masing-masing bernilai 0,0011 m dan 0,0007 m, nilai tersebut masuk ke dalam kategori Immediate Occupancy, yaitu kinerja yang umum digunakan dengan tingkat kerusakan yang sangat minim, risiko korban jiwa manusia yang sangat kecil, dan bangunan diharapkan mampu digunakan kembali.

scholarly journals Response Quantities of Framed Buildings under Dynamic Excitation

2019 ◽  
Vol 8 (11) ◽  
pp. 3798-3804
Keyword(s):  
Seismic Analysis ◽  
Structural Response ◽  
Base Shear ◽  
Response Factors ◽  
Analysis And Design ◽  
Dynamic Excitation ◽  
Combination Methods ◽  
Time Period ◽  
Moment Resisting ◽  
Seismic Forces

Seismic analysis of structure is employed to make the structure enable to resist the seismic forces and perform against the factors causing the failure of the structure under dynamic excitation. Among various response factors, the base shear and time period of buildings are predominant factors used in the analysis and design of the structure. The prime objective of the paper is to present an analytical study on non-linear seismic analysis of moment resisting framed buildings (as per Indian code IS1893 – 2016) to evaluate the base shear of different configurations of buildings according to different mode combination methods. The obtained results have been presented the comparative analysis of different combination methods. The paper also presents the evaluated results in the form of the time period values of the different buildings depending upon variation in its configuration. As a result, the responses of multistoried moment-resisting framed buildings have been evaluated for various models of considered buildings based on different mode combination methods, and the results of obtained responses have been analyzed in a comparative manner to understand the behaviour of buildings under various methods and configuration conditions. The work presented in the paper can support to develop better understanding of structural response and efficient designing of structures.

scholarly journals Improvement of Performance Level of Steel Moment-Resisting Frames Using Tuned Mass Damper System

2020 ◽  
Vol 10 (10) ◽  
pp. 3403 ◽  
Author(s):  
Masoud Dadkhah ◽  
Reza Kamgar ◽  
Heisam Heidarzadeh ◽  
Anna Jakubczyk-Gałczyńska ◽  
Robert Jankowski
Keyword(s):  
Steel Structures ◽  
Tuned Mass Damper ◽  
Performance Level ◽  
Base Shear ◽  
Tuned Mass Dampers ◽  
Ground Acceleration ◽  
Steel Moment Resisting Frames ◽  
Drift Ratio ◽  
Mass Damper ◽  
Moment Resisting

In this paper, parameters of the tuned mass dampers are optimized to improve the performance level of steel structures during earthquakes. In this regard, a six-story steel frame is modeled using a concentrated plasticity method. Then, the optimum parameters of the Tuned Mass Damper (TMD) are determined by minimizing the maximum drift ratio of the stories. The performance level of the structure is also forced to be located in a safety zone. The incremental dynamic analysis is used to analyze the structural behavior under the influence of the artificial, near- and far-field earthquakes. The results of the investigation clearly show that the optimization of the TMD parameters, based on minimizing the drift ratio, reduces the structural displacement, and improves the seismic behavior of the structure based on Federal Emergency Management Agency (FEMA-356). Moreover, the values of base shear have been decreased for all studied records with peak ground acceleration smaller or equal to 0.5 g.

Comparison between fixed base and isolated base in seismic response of high-rise buildings: a case study

2020 ◽  
Vol 6 (4) ◽  
pp. 204
Author(s):  
Anas M. Fares
Keyword(s):  
Response Spectrum ◽  
Soft Soil ◽  
Structural Response ◽  
Time History ◽  
Soil Condition ◽  
Soil Conditions ◽  
Spectral Acceleration ◽  
Base Shear ◽  
High Rise ◽  
Fixed Base

In this study, the influence of soil condition under the isolated and fixed bases is studied by using ETABS 16 software for the high-rise regular building. A regular building with 10 floors is modeled and the results are obtained for story displacements, story shear forces and spectral acceleration according to Uniform Building Code 97 (UBC-97) code. The time history analysis has been performed by using 1999 Izmit earthquake record. 3 types of soil which had different stiffnesses are considered in this study. The results show that the value of base shear increases when the soil stiffness decreases. It also noticed that the spectral acceleration is larger in soft soil condition than that of other soil conditions; and this confirms that the structural response spectrum is associated with the soil condition. In addition, when using base isolated building the drift of lower floors will be larger than that of using base isolated, but in the upper floors the drifts of fixed base building will be larger than that of the isolated base building. Finally, time history method in the seismic design will produce base shear less than that from equivalent static method, so calibration factor for design purpose shall be used.

scholarly journals Statics And Kinematics Of Semirigid Steel Frames Under Seismic Action

2015 ◽  
Vol 5 (2) ◽  
pp. 59-64
Author(s):  
Aliz Mathe ◽  
Al. Cătărig ◽  
Ilinca Moldovan
Keyword(s):  
Shear Force ◽  
Degrees Of Freedom ◽  
Steel Frames ◽  
Time History ◽  
Bending Moment ◽  
Cyclic Behavior ◽  
Seismic Action ◽  
Base Shear ◽  
Planar Frames ◽  
Lumped Masses

Abstract Intended contribution emphasizes the statics and kinematics of semi-rigid steel frames seismically acted upon. The dynamic model of analyzed structures consists of multi degree of freedom systems with lumped masses located at floor levels. The dynamic degrees of freedom are the lateral seismically induced floor displacements. A cyclic behavior of semi-rigid beam – column connections associated with the four parameters analytical bending moment M – relative rotation θr is considered. Time history seismic analyses are performed on multi-story steel planar frames equipped with several top and seat and web angle beam – column connections acted upon by recorded seismic actions. The computed numerical results refer to the contrary static and effects of semi-rigidity: the increase in lateral floor displacements accompanied by a decrease in the seismic base shear force. Relevant comments are drawn.

scholarly journals Optimal Design of Liquid Dampers for Structural Vibration Control Based on GA andH∞Norm

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Linsheng Huo ◽  
Wenhe Shen ◽  
Hongnan Li ◽  
Yaowen Zhang
Keyword(s):  
Optimal Design ◽  
Ground Motion ◽  
Structural Response ◽  
Optimal Solution ◽  
Time History ◽  
Optimization Procedure ◽  
Structural Vibration ◽  
Earthquake Excitation ◽  
Liquid Dampers ◽  
Ground Motion Records

This paper focused on the optimal design of liquid dampers for the seismic response control of structures. TheH∞norm of the transfer function from the ground motion to the structural response is selected as the optimal objective. The optimization procedure is carried out by using Genetic Algorithms (GAs) in order to reach an optimal solution. The proposed method has the advantages that it is unnecessary to solve the equation of motion for the control system and that the obtained optimal parameters of dampers are not dependent on the ground motion records. The influences of weighted functions on the optimization results are analyzed. The generality and effeteness of the proposed method are verified by the time history analysis of a 3-story structure subjected to earthquake records in different sites. The results show that the structural responses can be effectively reduced subjected to earthquake excitation at different sites.

Research on Structural Influencing Coefficient of Moment-Resisting Steel Frames

2011 ◽  
Vol 105-107 ◽  
pp. 937-942
Author(s):  
Cheng Li ◽  
Qiang Gu ◽  
Jun Wang
Keyword(s):  
Strong Earthquake ◽  
Steel Frames ◽  
Local Buckling ◽  
Time History ◽  
Shell Element ◽  
Seismic Code ◽  
Behaviour Factor ◽  
Satisfactory Performance ◽  
Moment Resisting ◽  
Ductility Capacity

This paper is focused on the evaluation of the structural influencing coefficient in multi-story moment-resisting steel frames involving local bucking effect, with due consideration to both their ductility and overstrength. Ductility and overstrength play an important role in keeping satisfactory performance of structures during strong earthquake. Firstly, moment-resisting steel frames of are designed according to Chinese seismic code. Based on the non-linear shell element method, both inelastic time history and pushover analyses has been performed on these steel frames to get the global capacity envelopes. The results show that number of stores and spans have effect on the behaviour factor values, and that the local buckling affects the ductility capacity of steel frames. Finally, based on the findings presented in the article, tentative influencing coefficient values are proposed for moment-resisting steel frames.

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