scholarly journals Evaluation of Response Reduction Factor of Existing Masonry Infilled RC-Buildings in Pokhara

2020 ◽  
Vol 1 (1) ◽  
pp. 41-51
Author(s):  
Tekkan Pandit ◽  
Hemchandra Chaulagain
Keyword(s):  
Pushover Analysis ◽  
Structural Response ◽  
Reduction Factor ◽  
Base Shear ◽  
Rc Buildings ◽  
Design Standards ◽  
Natural Period ◽  
Infill Walls ◽  
Response Reduction Factor ◽  
R Value

Most of the structural designer do not consider masonry infill walls during design process due to a lack of modeling guidelines in design standards and are treated as non-structural elements. In fact, the interaction effect between bounding frames and infill masonry is a complicated issue in nonlinearity of structures. The current seismic codes indirectly incorporate the nonlinear response of structure through linear elastic approach by considering the response reduction factor ‘R’ without comprising infill. In this context, this study evaluates the response reduction factor of existing engineered designed RC frame structures that are designed based on Indian standard codes. For this, three existing RC buildings were selected and performed non-linear pushover analysis. The structural response was examined in terms of natural period, base shear, strength, stiffness, ductility and response reduction factor. The results specify that the buildings with infill walls significantly influence on ‘R’ value of structures. Additionally, study shows that the variation of ‘R’ value mainly depends on the percentage of infill inclusion.

scholarly journals Effect of Building Configuration on Overstrength Factor and Ductility Factor

2021 ◽  
Author(s):  
Sagun Kandel ◽  
Rajan Suwal
Keyword(s):  
Residential Buildings ◽  
Pushover Analysis ◽  
Large Earthquake ◽  
Lateral Force ◽  
Reduction Factor ◽  
Base Shear ◽  
Response Reduction Factor ◽  
Overstrength Factor ◽  
Ductility Factor ◽  
High Level

It is important for the structure to be economical and still have a high level of life safety. The lateral force sustained by the structures during a large earthquake would be several times larger than the lateral force for which the structures are designed. This is opposite to the fact that design loads such as gravity in codes are usually higher than the actual anticipated load. It is based on the probability that the occurrence of large earthquakes is quite rare and the capacity of the structure to absorb energy. The co-factors of response reduction factor which is the overstrength factor and ductility factor reduce the design horizontal base shear coefficient. A total of 36 low-rise residential buildings having different storey, bay and bay lengths are selected and analysed in this paper. NBC 105: 2020 is selected for the seismic design of RC buildings while provision provided in FEMA 356:2000 is used to carry out non-linear pushover analysis. The results indicated that between the different structures, the value of overstrength factor and ductility factor has a high deviation.

scholarly journals Assessment of Response Reduction Factor of Flat Slab Structures by Pushover Analysis.

2020 ◽  
Vol 9 (6) ◽  
pp. 157-163
Keyword(s):  
Large Scale ◽  
Seismic Waves ◽  
Smart Cities ◽  
Pushover Analysis ◽  
Elastic Base ◽  
Reduction Factor ◽  
Base Shear ◽  
Flat Slab ◽  
Response Reduction Factor ◽  
Reinforced Concrete Slabs

India is rapidly developing in every aspect now. As a result of which number of smart cities are now arising. while building such smart cities major role is played by infrastructural development. In this infrastructures, speedy and economical constructions are expected to make them more effective. Among such effective construction systems, Flat slab system is the one and is being widely applied on large scale. Flat slabs are thin solid reinforced concrete slabs which are supported directly by columns without beams. Flat slab system is now well adopted for constructions of high rise multi- storied commercial, residential, institutional buildings. They have adventitious constructive, architectural and economical features including easier formwork, speed of construction, spaciousness, etc. The purpose of this project is to study the seismic behavior of Flat Slab Structure for different seismic zones by assessment of Response Reduction Factor using Pushover analysis. Response reduction factor is the factor by which intensity of seismic waves produced during earthquake (maximum elastic base shear) can be reduced to calculate the design base shear. In the project parameters such as base shear, shear and bending stresses and deflection check in flat slab structure are examined by using ETABS Software.

scholarly journals Application of DDBD and FBD Methodology for 8-Story RC Frame Using IS 1893 Spectra

10.29007/m72w ◽  
2018 ◽  
Author(s):  
Kunjan D. Gamit ◽  
Jignesh A. Amin
Keyword(s):  
Pushover Analysis ◽  
Reduction Factor ◽  
Rc Frame ◽  
Base Shear ◽  
Response Reduction Factor ◽  
Capacity Curves ◽  
Direct Displacement Based Design ◽  
Effective Period ◽  
Frame Building ◽  
Rc Frame Building

This study investigates the direct displacement based design (DDBD) and convectional force based design (FBD) approach for 8 storey RC frame building in DDBD methodology the displacement profile is calculated and the given MDOF is converted to equivalent single degree of freedom system. After calculating the effective period, secant stiffness, and viscous damping of the equivalent structure, the base shear is obtained, based on which the design and detailing process can be carried out. The designed frames as per DDBD and FBD approach are then analyzed using nonlinear pushover analysis to obtain the capacity curves and response reduction factor. Results of the analysis and comparison of ‘R’ factor indicate the efficiency of the DDBD approach for RC frame buildings

Evaluation of response reduction factor by pushover analysis

2018 ◽  
Vol 9 (2) ◽  
pp. 116
Author(s):  
Mayank Desai ◽  
Anurag Nambiar ◽  
Shefali Gahrana ◽  
Ronak Motiani ◽  
J.R. Kunal
Keyword(s):  
Pushover Analysis ◽  
Reduction Factor ◽  
Response Reduction Factor

scholarly journals IMPAβ: Incremental Modal Pushover Analysis for Bridges

2020 ◽  
Vol 10 (12) ◽  
pp. 4287 ◽  
Author(s):  
Alessandro Vittorio Bergami ◽  
Camillo Nuti ◽  
Davide Lavorato ◽  
Gabriele Fiorentino ◽  
Bruno Briseghella
Keyword(s):  
Pushover Analysis ◽  
Structural Response ◽  
Small Contribution ◽  
Base Shear ◽  
Higher Modes ◽  
Modal Pushover Analysis ◽  
Complementary Method ◽  
Incremental Methods ◽  
Total Base ◽  
Modal Pushover

In the present study, the incremental modal pushover analysis (IMPA), a pushover-based approach already proposed and applied to buildings by the same authors, was revised and proposed for bridges (IMPAβ). Pushover analysis considers the effects of higher modes on the structural response. Bridges are structurally very different from multi-story buildings, where multimodal pushover (MPA) has been developed and is currently used. In bridges, consideration for higher modes is often necessary: The responses of some structural elements of the bridge (e.g., piers) influence the overall bridge response. Therefore, the failure of these elements can determine the failure of the whole structure, even if they give a small contribution total base shear. Incremental dynamic analysis (IDA) requires input accelerograms for high intensities, which are rare in the databases, while scaling of generated accelerograms with a simple increment of the scaling acceleration is not appropriate. This fact renders IDA, which is by its nature time-consuming, not straightforward. On the contrary, the change of input spectrum required by IMPA is simple. IMPAβ also utilizes a simple complementary method coupled to MPA, to obtain bounds at very high seismic intensities. Finally, the two incremental methods based on static nonlinear and dynamic nonlinear analyses are compared.

scholarly journals Dynamic Analysis of Steel Silo

2020 ◽  
Vol 9 (1) ◽  
pp. 1986-1990
Keyword(s):  
Dynamic Analysis ◽  
Linear Time ◽  
Response Spectrum ◽  
Structural Response ◽  
Time History ◽  
Time History Analysis ◽  
Base Shear ◽  
Natural Period ◽  
History Analysis ◽  
Lateral Displacements

The structural response of any structure is the result of various dynamic phenomenon which lead to vibrations or shaking of the structure , depending on the duration of the ground motion, its frequency and time period. In the present work, dynamic analysis of a typical steel silo is done by using linear Time History Analysis and Response Spectrum method for earthquake Zone V as per Indian code. Two analyses are carried out namely, Time History Analysis (THA) and Response Spectrum Analysis (RSA) using STAAD.ProV8i software. The Load combinations are worked out as per IS-1893-2002. The results in terms of Fundamental natural period, Design Base shear, Lateral Displacements, are compared for the two different silo models considered in the present study.

Evaluation of response reduction factor by pushover analysis

2018 ◽  
Vol 9 (2) ◽  
pp. 116
Author(s):  
Ronak Motiani ◽  
J.R. Kunal ◽  
Shefali Gahrana ◽  
Anurag Nambiar ◽  
Mayank Desai
Keyword(s):  
Pushover Analysis ◽  
Reduction Factor ◽  
Response Reduction Factor
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