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 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 Non-Linear Performance of Strong Column Weak Beam RC Frame Building

2019 ◽  
Vol 9 (2) ◽  
pp. 22-26
Keyword(s):  
Pushover Analysis ◽  
Rc Frame ◽  
Lateral Loads ◽  
Base Shear ◽  
Plastic Hinges ◽  
Frame Building ◽  
Weak Beam ◽  
Non Linear ◽  
Rc Frame Building

Buildings are designed in different methods for resisting the lateral loads, in which strong column weak beam concept is one of the methods of designing, this method is used to avoiding the global failure of the structure In this work 3bay 5 story RC frame building is consider for the analysis, the structures are design strong column weak beam with the help of static non-linear pushover analysis of RC frame building with increasing the percentage of column sizes 20%, 40%, 60%, 80% and 100%. By varying with percentage of columns resistances of structure is increased. The parameters base shear, story displacement, and hinge formations in the structure is obtained from this analysis. The base shear and displacement are increased by increasing the column sizes, these parameters are discussed the results in detail. Comparing the all six model results the base shear in increased by 266.64% when the column size is increased by 100%. From this analysis we can reduce the failure in the structure during the earthquake. Formation of plastic hinges in column changes to beam by increasing the column size, so increase the capacity of structure. The building is analyzed by using SAP2000.

scholarly journals Seismic Performance of Multistorey RC Frame Building With The Soft Storey and Masonry Infill

2021 ◽  
pp. 650-656
Author(s):  
Kugan K ◽  
Mr. Nandha Kumar P ◽  
Premalath J
Keyword(s):  
Time History ◽  
Seismic Loading ◽  
Rc Frame ◽  
Base Shear ◽  
Maximum Displacement ◽  
Soft Storey ◽  
Masonry Infills ◽  
Frame Building ◽  
History Analysis ◽  
Rc Frame Building

In this study, four geometrically similar frames having different configurations of masonry infills, has been investigated. In this article attempts are made to explain the factors that impact the soft storey failure in a building are compared with different type of infill. That is Four models like RC bare frame, RC frame with brick mansonry infill, RC frame with brick infill in all the storeys exept the firstsoft storey, RC frame with inverted V bracing in the soft storey. Time history analysis has been carried out for a G+8 multistoried building to study the soft storey effect at different floor levels using E tabs software. The behavior of RC framed building with soft storey under seismic loading has been observed in terms of maximum displacement ,maximum storey drift, base shear and storey stiffness as considered structure.

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 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 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).

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