Effect of joint rigidity on structural behavior of RC buildings

Non-linear static analysis or pushover analysis is now-a –days generally preferred by many researchers to analyse the non-linear behaviour of the structure. Present study includes the effect of joint rigidity on the behaviour of the structure. A building is modeled with 5 and 10 story and designed for gravity and earthquake resistant loads by considering joint rigidity factor as 0 and 1. The analysis is done in both X and Y directions by using pushover analysis in SAP2000 software. Comparison is made between then capacity curves obtained from designed models of rigidity and non-rigidity models. From the results it is concluded that structure designed using joint rigidity has more strength when compared non-rigid joints.

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Response Reduction Factor for Different Heights of RC Structure

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b6638.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 3273-3276

Keyword(s):

Seismic Analysis ◽

Pushover Analysis ◽

Reduction Factor ◽

Framed Structures ◽

Response Reduction Factor ◽

Rc Structure ◽

Non Linear ◽

Linear Behaviour ◽

Rc Framed Structures ◽

Strength And Ductility

Seismic analysis is considered as an important parameter for any structural design. The strength and ductility of frame members in seismic design depends on the response reduction factor. In this paper four symmetrically framed structures are considered of different heights under the critical zone condition. The primary emphases of this work is regarding calculation of response reduction factor values attained from designing RC framed structures. The results are computed by applying non-linear static pushover analysis. SAP-2000 software is used for analyzing the non-linear behaviour of the structure.

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Effect of Masonry Infill Panels on the Seismic Response of Reinforced Concrete Frame Structures

Civil Engineering Journal ◽

10.28991/cej-2021-03091764 ◽

2021 ◽

Vol 7 (11) ◽

pp. 1853-1867

Author(s):

Ali Zine ◽

Abdelkrim Kadid ◽

Abdallah Zatar

Keyword(s):

Reinforced Concrete ◽

Seismic Response ◽

Pushover Analysis ◽

Reinforced Concrete Frame ◽

Masonry Infill ◽

Concrete Frame ◽

Capacity Curves ◽

Infill Panels ◽

Highly Nonlinear ◽

Non Linear

The present work concerns the numerical investigation of reinforced concrete frame buildings containing masonry infill panel under seismic loading that are widely used even in high seismicity areas. In seismic zones, these frames with masonry infill panels are generally considered as higher earthquake risk buildings. As a result there is a growing need to evaluate their level of seismic performance. The numerical modelling of infilled frames structures is a complex task, as they exhibit highly nonlinear inelastic behaviour, due to the interaction of the masonry infill panel and the surrounding frame. The available modelling approaches for masonry infill can be grouped into two principal types; Micro models and Macro models. A two dimensional model of the structure is used to carry out non-linear static analysis. Beams and columns are modelled as non-linear with lumped plasticity where the hinges are concentrated at both ends of the beams and the columns. This study is based on structures with design and detailing characteristics typical of Algerian construction model. In this regard, a non-linear pushover analysis has been conducted on three considered structures, of two, four and eight stories. Each structure is analysed as a bare frame and with two different infill configurations (totally infilled, and partially infilled). The main results that can be obtained from a pushover analysis are the capacity curves and the distribution of plastic hinges in structures. The addition of infill walls results in an increase in both the rigidity and strength of the structures. The results indicate that the presence of non-structural masonry infills can significantly modify the seismic response of reinforced concrete "frames". The initial rigidity and strength of the fully filled frame are considerably improved and the patterns of the hinges are influenced by structural elements type depending on the dynamic characteristics of the structures. Doi: 10.28991/cej-2021-03091764 Full Text: PDF

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Accounting for the Spatial Variability of Seismic Motion in the Pushover Analysis of Regular and Irregular RC Buildings in the New Italian Building Code

Buildings ◽

10.3390/buildings10100177 ◽

2020 ◽

Vol 10 (10) ◽

pp. 177 ◽

Cited By ~ 1

Author(s):

Sergio Ruggieri ◽

Giuseppina Uva

Keyword(s):

Pushover Analysis ◽

Three Dimensional ◽

Nonlinear Dynamic Analysis ◽

Building Code ◽

Rc Buildings ◽

Capacity Curves ◽

Conventional Procedure ◽

Relevant Point ◽

General Test ◽

Global And Local

Pushover analysis is the main methodology adopted in practice-oriented applications for investigating the non-linear response of reinforced concrete (RC) buildings; it is applicable for both new and existing buildings. It is well-known that several limitations characterize this methodology and the scientific literature proposes several non-conventional approaches to provide results comparable to those of the more efficient nonlinear dynamic analysis. In most recent seismic guidelines, some improvements have been introduced, in order to overcome the main drawbacks of conventional pushover methods, in view of practice-oriented applications. In particular, new prescriptions are related to the load profiles and the choice of control nodes, aspects that lead to different results in terms of capacity curves and in the safety assessment. Another relevant point is represented by the spatial combination of effects, which suggests the opportunity of executing simultaneous bi-directional pushover analyses. The aim of this paper is to investigate the effects of the new trends followed by some guidelines about pushover analysis, such as the recent 2018 release of the Italian Building Code. In particular, after a general test of the new conventional procedure for the case of RC buildings, a set of case studies has been generated, consisting of three-dimensional RC-archetypes specifically designed and investigated in order to cover the more significant scenarios. The results in terms of global and local performances are processed and critically analyzed, with the aim of appraising the main differences between the traditional and new approaches and identifying the effectiveness and of the actual improvements achieved.

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Efficiency of Shear Wall Location on Reinforced Concrete Buildingsin Ethiopia under Seismic Excitation

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.d4252.118419 ◽

2019 ◽

Vol 8 (4) ◽

pp. 10624-10631

Keyword(s):

Pushover Analysis ◽

Time History ◽

Shear Walls ◽

Time History Analysis ◽

Seismic Excitation ◽

High Rise ◽

Capacity Curves ◽

History Analysis ◽

Non Linear ◽

Dynamic Time

Shear walls play a key role in the lateral-load resistance process in high-rise buildings, as well as resisting the lateral loads generated by seismic forces. This paper examines the effect of shear walls in rectangular, L, and U type and their locations in RC building under seismic excitation. Seismic impact is primarily concerned with structural protection, particularly during the earthquake and also with high-rise buildings, ensuring adequate lateral rigidity to withstand seismic loads is very critical. Rectangular, L and U shaped shear walls was analyzed and compared at various location using non-linear analysis. For analysis three models were considered with various above said shapes at different locations of high rise buildings in high seismic regions of Ethiopia. The structure's seismic capacity and demand were analyzed using non-linear pushover analysis based on displacement. Regular in plane and elevation building for this investigation G+7 was targeted to estimate the structure's seismic response and resistance capacity Non-linear dynamic time-history analysis was performed for comparison, by applying 30 artificially generated ground motion for all sample buildings. The capacity curves of the structures, as derived by pushover analysis were compared for buildings with rectangular, L and U shape shear walls using Seismo-Struct software. Also, the performance levels of structures are estimated and compared using Seismo-Struct software to perform nonlinear dynamic time-history analysis.

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Development of Fragility Functions of RC Buildings in Yangon City Using Push over Analysis

Journal of Disaster Research ◽

10.20965/jdr.2018.p0031 ◽

2018 ◽

Vol 13 (1) ◽

pp. 31-39 ◽

Cited By ~ 2

Author(s):

Chaitanya Krishna Gadagamma ◽

Aung Ko Min ◽

Hideomi Gokon ◽

Kimiro Meguro ◽

Khin Than Yu ◽

...

Keyword(s):

Risk Evaluation ◽

Seismic Vulnerability ◽

Pushover Analysis ◽

Disaster Mitigation ◽

Rc Buildings ◽

Seismic Vulnerability Assessment ◽

Capacity Curves ◽

Damage Probability ◽

Nonlinear Static ◽

Static Pushover Analysis

The recent apprehensions about active seismicity in Myanmar is a reminder of the significant hazards caused by earthquakes. Since some cities are subjected to high seismic risk, its assessment can be invaluable for disaster mitigation. This study focused on the development of fragility/damage probability functions for reinforced concrete (RC) buildings in Yangon city because seismic vulnerability assessment is being an essential component of risk evaluation. Nonlinear static pushover analysis is carried out on a group of 54 RC buildings (39 low-rises and 15 high-rises) by varying the material strengths, as well as and analysis based on capacity curves over the demand spectrum with fixed performance points representing the damage probability as a function of both spectral displacement and ground accelerations.

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A Non-Linear Tubular Joint Response Model for Pushover Analysis

21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3 ◽

10.1115/omae2002-28634 ◽

2002 ◽

Cited By ~ 6

Author(s):

Adrian F. Dier ◽

Oyvind Hellan

Keyword(s):

Test Data ◽

Full Range ◽

Pushover Analysis ◽

Offshore Structures ◽

Comparative Approach ◽

Analysis Tool ◽

Tubular Joints ◽

Non Linear ◽

Linear Behaviour ◽

Joint Behaviour

Pushover analyses are increasingly being used by the offshore industry in the assessment, and design, of offshore structures. Traditionally, such analyses are conducted on the basis that the tubular joints are assumed to be rigid. Whereas special finite elements for capturing the buckling behaviour of beam-columns have been in existence for some years, there has been no comparative approach for dealing with tubular joints, that is until the work reported in this paper. The work was carried out under the aegis of a major international Joint Industry Project concerned with the development, testing and calibration of an efficient analysis tool that allows the non-linear behaviour of tubular joints within a space frame structure to be appropriately accounted for. Pushover analysis incorporating proper joint behaviour can now be efficiently conducted with minimal user intervention. The paper describes the algorithms that were developed to simulate the non-linear behaviour of tubular joints under combined axial, in-plane and out-of-plane moment loads, across the full range of the load-deformation response. The (uncoupled) P-δ and M-θ responses were first represented by powerful, yet simple, equations whose coefficients were established by reference to test data. Coupling, for combined loads, was achieved by adapting plasticity theory algorithms. The interaction of chord loads on joint response and how the issue of joints having mixed K/X/Y classification is encompassed in the algorithms is addressed. Ductility limits and unloading behaviour are discussed. Finally, testing of the codified algorithms and calibration against frame test data are mentioned. The results demonstrate that frame response is more accurately captured when joint behaviour is taken into account.

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PERILAKU STRUKTUR BAJA TIPE MRF DENGAN BEBAN LATERAL BERDASARKAN SNI 1726-2012 DAN METODE PERFORMANCE BASED PLASTIC DESIGN (PBPD)

Jurnal Teknik Sipil ◽

10.24002/jts.v13i1.640 ◽

2014 ◽

Vol 13 (1) ◽

Author(s):

Nidiasari Jati Sunaryati Eem Ikhsan

Keyword(s):

Pushover Analysis ◽

Time History ◽

Time History Analysis ◽

Plastic Design ◽

History Analysis ◽

Non Linear ◽

Static Pushover Analysis

Struktur rangka baja pemikul momen merupakan jenis struktur baja tahan gempa yang populer digunakan. Daktilitas struktur yang tinggi merupakan salah satu keunggulan struktur ini, sehingga mampu menahan deformasi inelastik yang besar. Dalam desain, penggunaan metode desain elastis berupa evaluasi non-linear static (Pushover analysis) maupun evaluasi non-linear analisis (Time History Analysis) masih digunakan sebagai dasar perencanaan meskipun perilaku struktur sebenarnya saat kondisi inelastik tidak dapat digambarkan dengan baik. Metode Performance-Based Plastic Design (PBPD) berkembang untuk melihat perilaku struktur sebenarnya dengan cara menetapkan terlebih dahulu simpangan dan mekanisme leleh struktur sehingga gaya geser dasar yang digunakan adalah sama dengan usaha yang dibutuhkan untuk mendorong struktur hingga tercapai simpangan yang telah direncanakan. Studi dilakukan terhadap struktur baja 5 lantai yang diberi beban gempa berdasarkan SNI 1726, 2012 dan berdasarkan metode PBPD. Hasil analisa menunjukkan bahwa struktur yang diberi gaya gempa berdasarkan metode PBPD mencapai simpangan maksimum sesuai simpangan rencana dan kinerja struktur yang dihasilkan lebih baik .

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