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 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.

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

scholarly journals Response Reduction Factor for SMRF 3D Frame Buildings on Sloppy Ground

2020 ◽  
Vol 9 (4) ◽  
pp. 2085-2092
Keyword(s):  
Control Method ◽  
Pushover Analysis ◽  
Research Work ◽  
Regular Structure ◽  
Reduction Factor ◽  
Nonlinear Static Analysis ◽  
Analytical Models ◽  
Analysis And Design ◽  
Response Reduction Factor ◽  
Finite Element Software

Lateral forces are key factors in the design of building structure and in general these forces are evaluated using linear static method with the incorporation of response reduction factor. The actual intensity of lateral force is minimized by response reduction factor. However IS Code 1893:2016 does not give information about the components of response reduction factor. The value mentioned in IS code may be based on expert engineering judgment without any scientific basis. The Present research work focus on the estimation of response reduction factor (R) of SMRF frames considering slope terrain without any impairment in slope in Zone V. Fifteen frame models are prepared according to the guideline of IS Code 456:2000 and lateral load on frame was assigned as per IS 1893:2016 (Part-1) for the research purposes. Evaluation of response Reduction Factor according to Applied Technical Council (ATC-19) is carried out which stated that response reduction factor is the product of Strength factor, Redundancy factor and Ductility factor. Pushover analysis also termed as nonlinear static analysis under displacement control method is performed on the analytical models by an integrated finite element software for structural analysis and design called ETABS 2017. P-delta governs the geometrical non-linearity of structure. It has been observed over strength of regular structure is more as compared to irregular geometrical model whereas the ductility reduction factor does not show any significant trend. Moreover, all the models are limited in 6 story only with same structural property additional research is needed considering wider set of parameters framework.

scholarly journals Response Reduction Factor for Different Heights of RC Structure

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.

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 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 Analytical Investigation of Response Reduction Factor (R) for R.C. Elevated Water Tank with Non-linear Static (Pushover) Analysis

2021 ◽  
Author(s):  
Saurabh Kulkarni ◽  
S. S Kadam ◽  
P. B Zambare
Keyword(s):  
Soil Properties ◽  
Pushover Analysis ◽  
Reduction Factor ◽  
Soil Conditions ◽  
Water Tank ◽  
Response Reduction Factor ◽  
Finite Element Software ◽  
Nonlinear Static ◽  
Static Pushover Analysis ◽  
Nonlinear Static Pushover Analysis

In the present work, an attempt is made to investigate response reduction factor (R) values of different soil types by using nonlinear static (Pushover) analysis for R.C. elevated rectangular water tank structure. All the parameters were investigated by varying properties of soft, medium and hard soils to cover a method of nonlinear static (Pushover) analysis. The zone factor (Z) kept constant Z – III for pandharpur site location and capacity of 150 m3 tank full in condition. This has resulted into SAP 2000 finite element software. The analysis of response reduction factor (R) value was done under three different soil conditions i.e. soft soil properties, medium soil properties, and hard soil properties. Response reduction factor (R) values indicate that R.C. elevated rectangular water tank structure without soil properties behaves quite the one value as per codal provisions.

Evaluation of R-Factor for 5 Storey RC Frame (IMRF) Building

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Aditya Kushwah ◽  
Aditya Kushwah ◽  
Aditya Kushwah
Keyword(s):  
Mode Shape ◽  
Fundamental Mode ◽  
Lateral Displacement ◽  
Pushover Analysis ◽  
Reduction Factor ◽  
Rc Frame ◽  
Response Reduction Factor ◽  
R Factor ◽  
Frame Building ◽  
Rc Frame Buildings

According to IS 1893 part 1 (2016), the philosophy of earthquake resistant structures allows for some damages and inelastic lateral displacement in the structure for energy dissipation during an earthquake. The non-linear behaviour of elements in the structure plays a crucial role in earthquake resistance. There are three detailed classes for distinct seismic zones in different national codes. In India, the draught IS 13920 advocated the usage of IMRF (intermediate moment resisting frame) in zones II and III. The 5 story IMRF is designed and detailed as per IS 1893 (part 1) 2016, IS 13920 (2016), IS 1893 draft, IS 13920 draft, IS 456 (2000). In addition, nonlinear static pushover analysis was performed on IMRF and SMRF RC frame buildings in accordance with FEMA 356. (Displacement Coefficient method) During the analysis, two distinct load patterns (i) parabolic as per IS 1893 (part 1) 2016 (ii) fundamental mode shape are utilised, and the influence of p-delta is also taken into account when evaluating the response reduction factor. The analysed R-factor for studied frame building for fundamental mode shape loading was found to be near to the initial estimated R-factor during the design.

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

scholarly journals Response Reduction Factor for Mansory Buildings

2020 ◽  
Vol 19 (1) ◽  
pp. 196-203
Author(s):  
Jagat Kumar Shrestha
Keyword(s):  
Pushover Analysis ◽  
Reduction Factor ◽  
Analytical Models ◽  
Elastic Response ◽  
Masonry Building ◽  
Masonry Buildings ◽  
Response Reduction Factor ◽  
Nonlinear Static ◽  
Static Pushover Analysis ◽  
Nonlinear Static Pushover Analysis

Most of the seismic codes used today incorporate the nonlinear response of a structure by providing an appropriate response reduction factor so that a linear elastic force-based approach can be used in designs. This study focuses on evaluating the response reduction factor for masonry buildings with different mechanical properties, which are used in modern codes to scale down the elastic response of the structure. Using a similar frame-approach, a nonlinear static pushover analysis is carried out on the analytical models of masonry building in finite element analysis software SAP2000v20.0.0. The response reduction factor components, flexibility, and over strength were computed from the results obtained from the nonlinear static pushover analysis. Finally, the response reduction factor is evaluated for different masonry buildings. It is concluded that the R-value given in IS: 1893-2016 for unreinforced masonry is not recommended for random rubble stonemasonry buildings in mud mortar.

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