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 Effect of Lintel Beam on Seismic Response of Reinforced Concrete Buildings with Semi-Interlocked and Unreinforced Brick Masonry Infills

2021 ◽  
Vol 6 (1) ◽  
pp. 6
Author(s):  
Mangeshkumar R. Shendkar ◽  
Denise-Penelope N. Kontoni ◽  
Sasankasekhar Mandal ◽  
Pabitra Ranjan Maiti ◽  
Dipendra Gautam
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Pushover Analysis ◽  
Reduction Factor ◽  
Brick Masonry ◽  
Rc Frame ◽  
Masonry Infill ◽  
Response Reduction Factor ◽  
Rc Frames ◽  
Adaptive Pushover

The primary focus of this study is to evaluate the nonlinear response of reinforced concrete (RC) frames with two types of brick infills viz., unreinforced brick masonry infill (URM) and semi-interlocked brick masonry infill (SIM) together with lintel beams, subjected to seismic loads. The seismic response is quantified in terms of response reduction factor and base shear. Infill walls are modeled using double strut nonlinear cyclic element. Nonlinear static adaptive pushover analysis is performed in the finite element program SeismoStruct. The response reduction factor (R) is computed from adaptive pushover analysis and performance for all models is obtained. The results showed that the average R factor of the RC framed structure with semi-interlocked masonry (SIM) is 1.31 times higher than the RC frame with unreinforced masonry (URM) infill. The R value of the bare frame with the lintel beam is found to be less than the corresponding value recommended in the Indian Standard Code. The results obtained in this study highlight that if the impacts of lintel beams and various brick infill scenarios are considered in the RC frames then the R values used for the design of RC frame buildings with infills would be underestimated (i.e., the evaluated R values are greater than the R values used for the design purpose).

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.

scholarly journals Response Reduction Factor for Lateral Load Resisting Frames with Vertical Discontinuity of Asymmetrical Structure

2021 ◽  
Vol 1197 (1) ◽  
pp. 012005
Author(s):  
Trupti Dongare ◽  
Preeti Kulkarni
Keyword(s):  
Static Analysis ◽  
Reduction Factor ◽  
Soil Conditions ◽  
Response Reduction Factor ◽  
R Factor ◽  
Lateral Forces ◽  
Asymmetrical Structure ◽  
Non Linear ◽  
Wall System ◽  
Linear Static Analysis

Abstract In recent times, the RC building construction with vertical discontinuity that is floating column structures are unavoidable feature and increases trends day by day. To reduce lateral forces the earthquake resistance structures are designed so the response reduction factor (R) is used to determine these lateral forces by using base shear values. The R factor depends upon the overstrength factor, ductility factor, redundancy factor also the sizes of columns, types of soil, zones and load transferring path, etc. The IS code provides response reduction factor only for OMRF and SMRF along with other structures like Braced frame system, Structural wall system, Dual system, Flat slab structure wall system, etc. so there are no codal provisions for floating column structures. Thus it is essential to study the real behaviours of RC buildings with discontinuity in load transferring path through non-linear static analysis, so the present research work is done on trying to find R factor for vertical discontinuous asymmetrical structure for different soil conditions and different positions of floating column using moment resisting frames. And the structure is analyzed by response spectrum analysis and non-linear static analysis using SAP2000 software.

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.

Sign in / Sign up

Export Citation Format

Share Document