Seismic Performance Assessment of Multi-storeyed RC Moment Resisting Frames Based on Plan Aspect Ratio by Pushover Analysis (original) (raw)
Related papers
In this paper study about the seismic analysis of special and ordinary moment resisting frame by the pushover analysis with the help of the SAP2000 software which is product of the Computer and Structure &Inc. The code used for seismic analysis IS CODE 1893 part1:2016. The method used in this analysis is Nonlinear static Analysis in which static analysis represent the Response Spectrum method. The main aims of this paper to study about the plastic hinges which produce after the collapse of the structure and also comparative study about the ordinary and special moment resisting frame that which one is perform better in the push over analysis. The hinges apply at the all beam and column to study about the plastic hinges in the structure. The main purpose to choose special moment resisting frame is that frame which resist the strong ground motion during the earthquake. The ordinary moment resisting frame is that frame which resists the low ground motion as compared to the special moment resisting frame. After analysis we can say that which frame produce little plastic hinges as compared to the other frame. The designing criteria of the Special Moment Resisting Frame and Ordinary Moment Resisting Frame are given in the Indian Standard Code 1893 part1:2016.
PUSHOVER ANALYSIS OF RC BUILDING: COMPARATIVE STUDY ON SEISMIC ZONES OF INDIA
Non-linear analysis is necessary to evaluate the seismic demand of the proposed or existing structure, as linear analysis is inadequate in assessing the seismic demand under severe earthquakes. In this article non-linear static analysis (pushover analysis) has been done to understand the behavior of G+9 multistoried residential building located in different seismic zones (II, III, IV, V) of India having similar geometrical properties using SAP2000. The behavior of multistoried building has been investigated in terms of force-displacement relationships, inelastic behavior of structure and sequential hinge formations etc. Plastic hinge formation gives real behavior of the structure. From the analysis results, it was observed that, when the zone varies from II to V, base shear, displacement and time period has been increased gradually, indicating the severity of seismic activity. In this analysis, firstly hinges were formed in beams and then in columns at ground floor of structure. The hinge formation propagates from ground floor to middle floor columns and then finally to the upper floor columns. The propagation of hinges from lower stories to upper stories leads to collapse of structure. Results indicate that, the damage in a building is limited and columns at the lower stories can be retrofitted based on the importance of the structure.
Effects of Building Configuration on Seismic Performance of RC Buildings by Pushover Analysis
In the recent earthquakes, concrete structures have been severely damaged or collapsed, which has raised questions against the seismic adequacy of existing buildings. These existing reinforced concrete buildings need to be evaluated to determine the capacity to resist seismic loads. The behavior of a building during earthquakes depends critically on its overall shape, size and geometry. Conventional approach to earthquake resistant design of buildings depends upon providing the building with strength, stiffness and inelastic deformation capacity which are great enough to withstand a given level of earthquake-generated force. This is generally accomplished through the selection of an appropriate building configuration and the careful detailing of structural members. In this research, nonlinear pushover analysis has been used to evaluate the seismic performance of three buildings with three different plans having same area and height. This method determines the base shear capacity of the building and performance level of each part of building under varying intensity of seismic force. The results of effects of different plan on seismic response of buildings have been presented in terms of displacement, base shear and plastic hinge pattern.
Seismic Performance of Existing RC Framed Buildings Using Pushover Analysis Method
Advances in intelligent systems and computing, 2020
The earthquakes disasters basically occur due to buildings damage not because of the earth shaking. Therefore, the countries have being updated the seismic codes. The seismic loads for buildings design in Egyptian Code have been changed from (EC-1994) to (ECP-201, 2012). On the other hand, the need is raised to study the vulnerability of existing buildings, which can be divided into the buildings designed to resist the gravity loads only (GLD) and the buildings designed according to Egyptian code (EC-1994). Comparison between forces due to Egyptian code for loads (EC-1994) and (ECP-201, 2012) is carried out on the multi-stories R.C. framed buildings which are the most common type of existing buildings in Egypt. To investigate the vulnerability of existing buildings, nonlinear static pushover analysis is conducted to evaluate the real strength of the existing buildings. Moreover, it is considered a useful and effective tool for the performance of three framed buildings: 3, 6 and 10 stories due to expected future earthquakes. Finally, it is found that the vulnerability of existing GLD buildings occurs at expected ground accelerations (a g) greater than 0.125 g in Egyptian seismic map, while the EC-94 designed buildings behave elastically up to (a g) equals to 0.2 g and above that a slight damage may occur.
Seismic Assessment of R.C.C Frame Building using Pushover Analysis
Regular, 2020
India is a making country with an arrangement of structure practices and social and money related structure, which needs to build up its own special strategies for seismic danger appraisal. The latest decade has shown our lack in peril decline programs, during the couple of hurting seismic quakes. In view of this quake alone in India there was massive loss of life and property. After this troublesome adversity thought is by and by being given to the appraisal of the adequacy of solidarity in structures to contradict strong ground developments. After Bhuj seismic quake IS-1893 was revised and appropriated in the year 2002, going before this scene it was refreshed in 1984. The code was first conveyed in 1962 as 'Recommendations for Earthquake Resistant Design of Structure'. The central reason behind the loss of life and property was inadequacy of learning of direct of structures during ground developments. The frailty of the structures against seismic development must be funda...
Evaluation of seismic performance of 6-storeys RC buildings, in ABHA City - KSA, by using pushover analysis method, 2021
Recently, the evaluation of the seismic performance of existing buildings has received great attention. Since Saudi Arabia has low to moderate seismicity, most of the existing buildings were designed only for gravity load. The objective of this study is to assess the seismic performance of existing reinforced concrete (RC) buildings in Abha city, Saudi Arabia. One typical building was investigated using pushover analysis according to the Applied Technology Council (ATC-40). They were designed according to the Regulations for earthquake-resistant design of buildings in Egypt (Egyptian Society for Earthquake Engineering, ESEE) and International Building Code (IBC2012). Results showed that the buildings designed considering by ESEE and IBC2012 loads were found adequate and satisfies the Immediate Occupancy (IO) acceptance criteria according to ATC-40. The comparison of the pushover curve shows that the stiffness of frames is larger when using ESEE Regulations compared to the IBC2012 design. This means that ESEE design procedure provides a greater capacity to resist seismic load than the IBC2012 design. Where are Findings?
Influence of Combine Vertical Irregularities in the Response of Earthquake Resistance Rc Structure
This study investigates the effect of frame setback with vertical irregularity in height on accuracy of Pushover Analysis for predicting target displacement, story drifts, base shear and performance point. The behavior of high rise building during strong earthquake motion depends on the distribution of mass, stiffness and strength in both horizontal and vertical planes of the buildings. The Indian IS code 1893:2002(Part 1) has pointed out of different structures irregularities like plan irregularity and vertical irregularity. In this study the seismic performance of G+ 16 storey having combine effect of vertical irregularity with R.C building are examined using Non Linear Static Analysis (Pushover Analysis). The Base shear, lateral displacement, storey drift and performance points are the response parameters use to quantify the performance of the structure. These irregularities are responsible for structural collapse of buildings under the action of dynamic loads. Five different types of building geometry are taken one regular and four irregular frames. The all buildings are modeled and analyzed in software SAP 2000. It was found that irregularity in elevation of the building reduce the performance level of structure.
Seismic Performance Assessment of RCS Building By Pushover Analysis
RCS moment-resisting frame systems, consisting of Reinforced Concrete (RC) columns and Steel (S) beams, take advantage of the inherent stiffness and damping, as well as low-cost of concrete, the lightweight and construction efficiency of structural steel. Past studies have shown these systems to be efficient in both design and construction stages while able to maintain sufficient strength and ductility necessary in seismic applications. Despite this past research, use of this hybrid structural system in the United States has been limited to non-or low-seismic zones. In addition, past studies have acknowledged that there is a fundamental need to test full structural systems, both analytically and experimentally, in order to substantiate the knowledge that has accumulated up to this point and (2) act as a proof of concept for the composite RCS frames. This paper aim to facilitate the greater acceptance and use of composite RCS systems as a viable alternative to conventional lateral resisting systems in comparison with the ordinary RC building. Two structures are considered to represent low rise RCS and RC structures for study. Theses consist of two typical steel beam and RC columns frame buildings without shear walls. Three story RCS buildings is designed according to EGP Codes of practice. Design columns under provisions of Egyptian reinforced concrete structures code and beams are designed according to Egyptian steel construction code. The comparative studies for the two buildings are presented.
Seismic design evaluation of T shaped irregular RC building plans by using pushover analysis
Sakarya University Journal of Science
This study has been conducted to find out how Turkish Seismic Code 2007 is effective in providing the Life Safety (LS) and Performance Level (PL) of T shaped plan irregularities reinforced concrete multi-story buildings; with special lateral loads bearing moment frame systems. For this purpose, a set of 12 multi-story residential buildings: 3-rectangular plans as reference and their respective 9-different T shaped plans of 3-, 6and 8-stories were considered in the North Anatolian Fault Zone (NAFZ) Turkey and were designed based on the code. Then, a modal and a static non-linear pushover analysis were conducted for all buildings. Base shear forces and roofs displacement for each building were computed. Besides, the formation trend of plastic hinges and their respective distribution in the entire buildings were inspected for evaluating the seismic performances. Results show that for some buildings the expected performance level which is LS has been overreached and even in some cases buildings reach the collapse prevention level. Based on this, it seems that the code provisions still require further upgrading to create enough confidence in the civil engineering community.
Open first storey and Floating column are typical features in the modern multi-storey constructions in urban India. The increase in urban population for the past few years has made the vehicle parking a major concern and hence the first storey of the apartment is used for parking. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes like Bhuj 2001. In this study an attempt is made to reveal the effects of floating column & soft storey in different earthquake zones by seismic analysis. For this purpose Push over analysis is adopted because this analysis will yield performance level of building for design capacity (displacement) carried out up to failure, it helps determination of collapse load and ductility capacity of the structure. In this present study four number of G+10 storey RCC building frame models are considered, out of which two models are regular ba...