ETABS Software Research Articles

Structural Analysis of Asymmetrical Multistory Building with Watertank Act as a Seismicdamper

Overhead water tank commonly used in buildings for various requirements. Overhead water tank is not only for water supply which also control the displacement of building during the earthquake force acting on structure. RCC over head water tank which gives the certain mass to the building this mass reduce the lateral movement of the building during seismic force on structure. In multi story structure, water tank also will lead the important factor for reducing the seismic response of the building. Using this technique overhead water tank placed on asymmetrical multi story building at different places. In thatone particular location reduce the seismic response more that place is choose for placing water tank. The advantage of this method isoverhead water tank is used for water supply as well as controlling of seismic response. Response spectrum analysis are used for analysis the structure in ETABS software. This software is used to checking the particular location for fixing the overhead water tank.IS standards are used for this analysis. In this experiment purpose the G+10 building is analysed in this study. This method is very economical it save the extra money for strengthening the building.

“Analysis of Seismic Behaviours of RC Frame Structure With Bracing System and Without Bracing System”

Abstract: This work time history analysis is carried out for G+23 storey steel frame building with different pattern of bracing system. The member property of beams 300mm X 400mm and columns 300mm X 500mm and ISLB250 sections are used to compare for same patterns of beam, column and bracings. A software package ETABS SOFTWARE is using for the analysis of steel buildings and different parameters are compared. The property of the section is used as IS 456:2016 and per IS 800:2007 which is analysis for various types of bracings like X, V, inverted V, Eccen Forward, Eccen Back and without bracing and Performance of each frame is carried out and studied the comparatively through Response Spectrum Method as per IS:1893:2016. In this study model a G+23 with Square Shape building Plan 52m X 52m, height of each floor is 3.2m and Structure in Etabs software by Response Spectrum Method and Analysis the Earthquake analysis of the Structure in seismic zones III with soil Medium conditions. Parameter Using:Type of Building: RC buildings with and without Steel Bracing System Number of Floors: G+23 (Square Shape Building)Section Property: Beam size 300X400mm, Column size 300X500mm, and ISLB250 sections. Seismic Zone- III, Soil Site factor 2 for Medium Soil, Damping = 5% (as per table-3 clause 6.4.2), Zone factor for zone III, Z=0.16), Importance Factor I=1.5 (Important structure as per Table-6), Response Reduction Factor R=5 for Special steel moment resisting frame Table-7), Sa/g= Average acceleration coefficient (depend on Natural fundamental period)Grade of concrete is considered M25, Grade of Rebar is considered Fe-415, Grade of Steel –Fe-345,Dead Load for Wall = (3.2-0.4) X 0.23X20= 12.88 KN/m

Comparative Study of Conventional Slab, Flat Slab and Waffle Slab by using Finite Element Method

Abstract— The slab is the main component of the structure. There are different types of slab used in different structure and gives better appearance to the structure. In this project, three type of slab to be used. The comparative study of Conventional slab, flat slab, and waffle slab under seismic condition to be analyzed. An effort has been made to evaluate the study between Conventional slab, flat slab, and Waffle slab for G+10 story building. This type of slab has been analyzed and designed by ETABS software. The plan of waffle slab plan is done in such a way in order to accomplish better burden dispersion. The near investigation of waffle slab with flat Slabs and conventional slab and features the benefit waffle slab have over flat Slabs and conventional slab. The parametric studies comprise maximum lateral displacement, story drift, and axial forces generated in the column due to slab. Keywords— ETABS, Conventional Slab, Flat Slab, Waffle Slab, Story Displacement

Comparative Study on Tall Structures with Different Aerodynamic Modification Subjected to Wind Load Using ETABS

High rise Structures are in demand due to scarcity of land in urban areas, economic growth, technological advancement, etc. Wind effect is very important for high rise structures and provides significant contribution to overall loading and serviceability. But as we go higher wind excitation becomes one of the most precarious force acting on the surface of the structure. So modifications to the structural geometry is on of the best idea to reduce the wind impact. In this paper different aerodynamic modification are applied to the G+40 square structure. Minor modification like round corner, recessed corner and major modification like setback, tapered were considered. Wind analysis for these models were done in ETABS software and the obtained results were compared with basic square model. Then the model having less impact for wind is concluded as the best modified structure

Pushover Analysis of Sir M Visvesvaraya Block NMAMIT NITTE

Pushover analysis is one of the most-used nonlinear static procedures for the seismic assessment of structures, due to its simplicity, efficiency in modeling and low computational time. The previous studies about pushover analysis are almost based on symmetric building structures and unidirectional earthquake excitation. This analysis is conducted to evaluate the seismic capacities of an existing asymmetric-plan building. The seismic response of RC building frame in terms of performance point and the effect of earthquake forces on multi storey building frame with the help of pushover analysis are carried out. In the present study the building frame is designed as per IS 456:2000 and IS 1893:2002. We should also go through ATC-40, FEMA 356. To get knowledge of pushover analysis we have to learn Etabs and should practice to analysis a RC building. The main objective of this study is to check the kind of performance a building can give when designed as per Indian Standards. The pushover analysis of the building frame is carried out by using structural analysis and design software ETABS (Version 19).

Seismic Retrofit using ETABS

In India, Multi-storied structures built are deficient of land and have to carry maximum load. Earthquake could be a circumstance which might result in the failure of the structure. Buildings are to be created so that they are safe to live in and the structure before failure should possess ductile property. To prevent structures from failing and from serious damages the structures before construction should be analyzed for its seismic performance along with support reactions and wind calculations both are to be included in the design of an earthquake resistant structure. The primary objective of present study is to make earthquake resistant structure by retrofitting its columns and the process is known as column jacketing. The retrofitted structure is analyzed in the E-tabs software. For this purpose, a retrofitted G+5residentialbuilding is considered. Calculations are done for an earthquake in seismic zone V. To guarantee the safety of the structure all the forces acting on the structure including the lateral loads due to wind and seismic excitations are considered. Because of the jacketing the column strength and the overall stability of the structure will increase. By using IS Code (IS 15988-2013), the jacketing will be done in E-tabs software. After the jacketing the various responses including bending moment, shear force of existing building will be studied under various loads for an earthquake in seismic zone V.

Performance of Mid Rised RCC Structure using Flat Slab System

Flat-slab building structures possesses major advantages over traditional slab-beam-column structures because of the free design of space, shorter construction time, architectural –functional and economical aspects. Because of the absence of deep beams and shear walls, flat-slab structural system is significantly more flexible for lateral loads then traditional RC frame system and that make the system more vulnerable under seismic events. The critical moment in design of these systems is the slab-column connection, i.e., the shear force in the slab at the connection, which should retain its bearing capacity even at maximal displacements. The behavior of flat slab building during earthquake depends critically on ‘Building Configuration’. This fact has resulted in to ensure safety against earthquake forces of tall structures hence, there is need to determine seismic responses of such building for designing earthquake resistant structures. Response Spectrum analysis is one of the important techniques for structural seismic analysis. In the present work analysis of 4 models of multi-storied RCC Flat slab structure is carried out by response spectrum analysis. The BIS guideline in IS 1893:2002 says “Regular and Irregular Configuration to perform well in an earthquake, a building should possess four main attributes, namely simple and regular configuration, and adequate lateral strength, stiffness and ductility. Buildings having simple regular geometry and uniformly distributed mass and stiffness in plan as well, suffer much less damage than buildings with irregular configurations”. Similarly, in IS 4326:1993 it is mentioned that “The building should have a simple rectangular plan and be symmetrical both with respect to mass and rigidity so that the center of mass and rigidity of the building coincide with each other.” But the limiting “plan aspect ratio” and “Slenderness ratio” for the regular structure is not prescribed. This study is concerned with the behavior of structure having same plan area but different plan aspect ratio (L/B) and slenderness ratio (H/B) under seismic condition. The structures are simulated in ETABS software and analyzed using Response Spectrum method.

Response of Elevated Water Tanks Subjected to Lateral Loads

Abstract During previous earthquakes around the world, it was discovered that elevated water tanks were severely damaged or collapsed. As a result, structural engineers are concerned about the analysis of these structures to gain a better understanding of the effects of seismic loads on elevated water tanks. In the current study, E-Tabs software, which is based on finite elements, is used to model various shapes of elevated water tanks along with various staging patterns. The higher stiffness of the supports in cross staging tanks makes them better than normal staging tanks, according to the results of the analysis. Furthermore, circular tanks perform better than other tank shapes when subjected to seismic loads. The study looks at water tanks subjected to static seismic loads. More research is needed to determine the analysis results for the dynamic seismic loads applied to the structure. All the analysis results are derived from the software’s tank analysis results.

COMPARATIVE STUDY ON THE EFFECTS OF SHEAR WALL AND BRACING ON MULTISTORIED BUILDING

High rise structures are susceptible to failure and collapse in case of earthquakes. Now a days, shear wall and steel bracings are most popular systems to resist lateral loads due to earthquakes. Both the systems have significant roles in reducing the damage caused due to lateral loads in case of an earthquake. In this study, an attempt has been made to study the performance of a G+9 story building with shear wall and bracing in seismic zone V and comparison has been made between the two systems to find the most suitable earthquake resistant structure. Response Spectrum Analysis has been performed in the software ETABS. The performance is evaluated on the basis of story displacement and story drift.

Comparative Study of Linear Static and Linear Dynamic Method of Seismic Analysis of RCC Multistoried Building Using ETABS

Abstract: As the modern buildings have been getting taller and narrower than before, the structural engineers have to perform both static and dynamic analysis for seismic loads that may affect on structures in order to make sure of the safety verifications and the optimal design requirements. Reinforced concrete (RC) building frames are the most common types of constructions in urban India. Throughout their lifetime, these are subjected to various types of forces such as static forces due to dead loads, live loads and dynamic forces due to earthquakes. In the present study, one tall RCC building of 10 stories is assumed to be situated in seismic zone 4 is analyzed using two different methods i.e., Equivalent static method (static) and response spectrum method (dynamic), using ETABS software. From analysis, the parameters like storey displacement, storey drift, base shear and time period and frequency are determined and also comparative study is done for both the methods Keywords: {RCC Buildings, Equivalent static method, response spectrum method, storey displacement, storey drift, Base shear, time period.}

Seismic analysis of a frame structure equipped with displacement-amplified torsional dampers

The angular displacement of the beam-column joints of the frame structure is small under earthquake action, and the seismic mitigation effect of ordinary dampers placed at the joints is not obvious. The displacement-amplified torsional damper (DATD) is one that can be directly installed at the joint and has a displacement-amplifying function. Finite element numerical simulation on the mechanical properties of DATD was carried out in this paper. The theoretical mechanical model of DATD was derived, and the trilinear mechanical model and the modified Bouc-Wen model were used to describe the mechanical characteristics of DATD, respectively. Numerical simulation and theoretical analysis results agreed well with the experimental results. Then, the ETABS software was adopted to analyze and compare the dynamic responses of ordinary frame and frame equipped with DATAs under frequent and rare earthquakes. Results showed that compared with the uncontrolled structure, the inter-story angular displacement, top-story displacement and internal force at the frame joints of the controlled structure equipped with DATDs remarkably decrease, and the effect of energy dissipating and vibration control is obvious. DATD significantly delays the structural damage at the joints while dissipating the input earthquake energy and reducing the structure’s dynamic responses.

A Review on Dynamic Analysis of Outrigger Systems in High Rise Building against Lateral Loading

Abstract: In this research dynamic analysis of outrigger system was carried out for a 60-storey building having an overall height of 180 m. First of all, comparison of performance between single and multi-outrigger was drawn, then analysis was carried out on different outriggers such as X, V, Inverted V and shear wall. Outriggers were placed according to Taranto theory i.e. (1/n+1), (2/n+1), (3/n+1), (4/n+1) … (n/n+1) of height [30]. Frame with only shear wall core and other outrigger models were analysed in ETABS software and different parameters as Maximum Story Displacement, Maximum Story Drift and Story Shears was compared. By analysing all the models by dynamic analysis for Earthquake Load (Response Spectrum) and static analysis for Wind Load it was concluded that structure becomes more resistive to lateral load with increase in no. of outriggers. Between X, V and inverted V type steel outrigger, inverted V is most effective but when shear wall was used as an outrigger, it gave better results than steel outriggers. Also belt trusses or shear bands increases the effect of outriggers even more. Keywords: Outrigger System, ETABS, Dynamic Analysis, Static Analysis, Lateral Load

Seismic Vulnerability Assessment for Various Shapes and Types of Reinforced Concrete Shear Walls in Multi-Storey Buildings

To improve the lateral stiffness and economy, reinforced concrete shear walls are introduced in buildings. This study aims to conduct the seismic assessment of shear walls in a multi-storey building. In this work, various factors are investigated and their performance is compared for various shapes and types of shear walls with respect to strength, displacement, time period, etc. The building considered for the study purpose is a G+12 residential building and is situated in a high seismic zone. The response spectrum analysis of the building is carried out by using the software ETABS. The results show that shear walls not only reduce the seismic forces in a building, but also are advantageous if they are situated in proper positions.

Structural analysis and optimal retrofitting solutions for historical monument with masonry walls

Abstract ”Braila Emergency County Hospital (ECH)” historical monument represents one of the main objectives of structural rehabilitation in both Braila county and Braila city. Thus, a structural strength verification for Pavilion B, Section 2, using ETABS software was performed, in order to find optimal retrofitting (rehabilitation) solutions. This analytical procedure proved to be beneficial and absolutely necessary, due to observations regarding the spatial contribution of masonry shear walls and finally the proper establishment of capable/design efforts. Following the structural calculation, it was concluded that the best solution would be to use composite materials for retrofitting a certain number of masonry shear walls, as classical retrofitting methods proved to be more expensive and structurally inefficient. Furthermore, in the context of the COVID-19 pandemic, the solution to use composite materials is beneficial, as it would entail no personnel or patients to be evacuated during the rehabilitation works, i.e. the hospital being able to continue to operate.

The Effect of Shear Wall Openings on the Response Reduction Factor

This research attempts to investigate the effect of shear wall openings on the response reduction factor. Openings are commonly necessary because of other engineering disciplines’ requirements. When openings are modest in proportion to the size of the wall, their effects are frequently disregarded. On the other hand, when these openings are large or located in a high-risk area, they can have a significant impact. A broad literature review has been conducted in the present study. A verified comparative example consisting of eight stories was studied. Then, a numerical study has been conducted on two different model sets with 16 and 8 stories, which were designed according to the Egyptian code of loads, ECP-201 (2012), and checked according to the Euro code, EC8 (2004). ETABS software was used to conduct pushover analysis before and after applying different-sized openings. The ground-opening effect has also been studied. The results show that by increasing the opening area, the R-factor was reduced. It is more influenced by the opening height than the width, though. By increasing the number of stories, the reduction percentage in the R-Factor increased for openings that are less than 30% of the wall area. The R-factor increases slightly when half of the reinforcement bars are added. Doi: 10.28991/CEJ-2022-08-04-013 Full Text: PDF

Structural Resistance of a Reinforced Concrete Building under Earthquake and Wind Loads in Isparta and Burdur Region

It has been clearly seen from building experiences and studies that lateral load effects such as earthquake load and wind load make building irregularities more obvious. Hence, it is of great importance to evaluate the regularity of the structural systems in accordance with the conditions determined by the building regulations. In this paper, irregularity effects were investigated according to Turkish Building Earthquake Regulation (TBEC) 2018. A reference building which have vertical setback irregularity were analzed under earthquake and wind loads. Etabs software were used for structural analyses. Response spectrum method were used for the seismic analysis and TS498 for Wind load analysis. Effective relative storey drift, A1 –Torsional irregularity and B2 –Soft Storey Irregularity are comparatively investigated and Irregularity values were determined.

Application of CSPC composite shear wall equipped with tension-and-compression damper in multi-storey structures

The purpose of this study is to investigate the performance and application of concrete composite shear walls with corrugated steel sheet equipped with damper system in a variety of real structures of 4, 8 and 15 storey under seismic load. In the studied structures, the seismic load-bearing system includes the dual system of special moment- resisting frame in combination with the mentioned concrete composite shear wall. To achieve the objectives of the present study, the replaceable vertically corrugated steel plate-concrete (CSPC) composite shear wall (i.e. NEW_V) and the replaceable horizontally CSPC composite shear wall (i.e. NEW_H) equipped with replaceable dampers are simulated utilizing ABAQUS software. In order to gain the sections and profiles of the dual system employed in ABAQUS software, ETABS software is applied for modeling and designing in accordance with the required standards. First, to ensure the conformity of the numerical model with the laboratory model of the mentioned shear walls, validation is accomplished. Criteria such as displacement, stiffness, shear capacity and energy dissipation are compared for validation. Based on the validation results, the outputs of the numerical models of the present study are in good agreement with the laboratory results. After performing the necessary simulation and modeling, the proposed scheme is implemented on the proposed structures. It can be said that structures equipped with damper had better performance (between 25% and 35%) than structures without damper (for both NEW_V and NEW_V specimens). The reason is the creation of less base shear in structures equipped with damper under seismic force. Thus, these structures have good energy absorption and ductility. Also, the stiffness of these structures is not significantly reduced.

Comparison of RCC and Post-Tensioned Flat Slabs Using ETABS

Flat slabs are widely used nowadays. The system’s insufficient punching shear capacity is a major and serious flaw. There are numerous approaches to increasing the punching shear strength of concrete slabs to solve the problem of punching failure. Increasing the thickness of the slab adjacent to the column, as well as the thickness of the column, contradicts the architectural intent. In developing countries such as India, the benefits of prestressing, particularly post-tensioning, have yet to be recognized. In this study, the technique of post-tensioning is used to strengthen a flat slab. RCC flat slabs are compared to post-tensioned flab slabs with different tendon profiles. Tendons are available in two forms: distributed and banded. The models were built as per ACI 318-14. These slab models were created using ETABS software, and the following parameters were compared: thickness, supporting reactions, punching shear, and deflection. When compared to traditional flat slabs. The results indicate that post-tensioned flat slabs have a higher punching shear capacity even at shallower depths, resulting in more cost-effective sections. The provision of tendons also results in lower deflection.

Seismic Behavior of Flat Slab for Optimum Location of Bracings

As increasing population necessity of the land required to build a structures is keep on decreasing so that high rise structures are everywhere. Use of flat slab in high rise structure has many advantages compared to RC conventional slab system. To increase the lateral resistivity of the flat slab building, diagonal type buckling restrained braces are provided at the corners. The main objective is to know about the Seismic behavior of flat slab with BRB for different re-entrant corner irregularities(Plus, T, L), using nonlinear time history analysis with help of ETABS software. 20storey flat slab drop panel building with BRB is modelled and analyzed in zone III. Comparing the different re-entrant irregularity buildings with and without bracings. Plus shape flat slab with bracing building shows better performance compared to all other models with respects to various parameters such as lateral displacement. Storey drift, storey stiffness, base shear and time period.

Static Analysis of 23 Storey Building in ETABS with Geometric Plan Irregularities

Static analysis is a simplified method of analysis in which the effect of an immediate change to a system is calculated without regard to the longer-term response of the system to that change. This analysis also deals with calculating the shear force and bending moment parameters for structural members of a building[1]. ETABS stands for Extended 3Dimensional Analysis of Building Systems and is a product of Computers and Structures Inc. It is engineering software that is used in construction for analysis and design of structural elements of a building. It has highly efficient structural analysis and design programs developed for catering to multi-story building systems[2][3]. Our project “Static Analysis of 23 storeys building in ETABS with geometric plan irregularities” is an attempt to analyse a multi storey building using ETABS software. Analysis is carried out by static method as per IS 456 and IS 875:1975 Part 3. The scope of the study is to produce good results of structural analysis of different structural elements of a high rise building.