scholarly journals Comparative Study on seismic analysis and Retrofitting of an Existing Building

2021 ◽  
Vol 9 (VII) ◽  
pp. 3018-3027
Author(s):  
Muniraju J
Keyword(s):  
Seismic Analysis ◽  
Time History ◽  
Time Frame ◽  
Base Shear ◽  
Existing Building ◽  
Building Model ◽  
Removal Time ◽  
Stacking Condition ◽  
Similar Code ◽  
The Impact

The target of this undertaking is to examine and comprehend the impact of utilizing retrofitting strategies on a structure against the seismic unique burden. The investigation is completed on four models of a G+4 building. Model 1 was not exposed to any seismic burden and was discovered to be protected against the arrangement load and live burden and its blend. Model 2 was exposed to dynamic seismic burden and its mix and the disappointment of primary individuals was noted. Accordingly retrofitting was done in the following two models. In Model 3 the structure was retrofitted with bracings were as in Model 4 section jacketing and in Model 5 shear divider were utilized. Boundaries like removal, time history, firmness and base shear were chosen subsequent to leading a careful writing audit. Time-frame of the structure was ascertain according to IS1893-2016, and Zone factor was chosen as 0.1 and 0.16 alongside significance factor as 1 and Soil type as II from a similar code. Then, at that point the same static examination and reaction range investigation was completed on Models 2,3,4 and 5 individually and there results were arranged. In light of the outcomes acquired for the given boundaries and dynamic stacking condition it was reasoned that retrofitting the structure will in general decrease the impacts of dynamic stacking on the design. Further it was noticed that retrofitting the structure with shear divider gave the best suitable outcomes. As it diminished the time-frame of the structure by 32.72% and furthermore lessen the sidelong relocation and story float in both X and Y heading by a decent edge.

scholarly journals Review on Seismic Analysis of Multistoried Building in Hilly Region

2021 ◽  
Vol 9 (12) ◽  
pp. 73-79
Author(s):  
Harsh Joshi
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Center Of Mass ◽  
Time History ◽  
Lateral Loads ◽  
Base Shear ◽  
Building Frames ◽  
Building Frame ◽  
History Analysis ◽  
Hilly Region

Abstract: Due to sloping land and high seismically active zones, designing and construction of multistory buildings in hilly regions is always a challenge for structural engineers. This review paper focuses to establish a review study on the Possible Types of building frame configuration in the hilly region and he behavior of Such building frames under seismic loading conditions, and (3) The recent research and developments to make such frames less vulnerable to earthquakes. This paper concludes that the dynamics characteristics of such buildings are significantly different in both horizontal and vertical directions, resulting in the center of mass and center of stiffness having eccentricity at point of action and not vertically aligned for different floors. When such frames are subjected to lateral loads, due to eccentricity it generates torsion in the frame. Most of the studies agree that the buildings resting on slanting ground have higher displacement and base shear compared to buildings resting on plain ground and the shorter column attracts more forces and undergoes damage when subjected to earthquake. Keywords: Building frame configuration, Seismic behavior, Dynamic characteristics, Response spectrum analysis, time history analysis.

scholarly journals Analisa Perilaku Bangunan Tidak Beraturan Secara Horizontal Dengan Dilatasi Terhadap Gempa

2019 ◽  
Vol 14 (2) ◽  
Author(s):  
Masnawari Rahmadani ◽  
Ririt Aprillin ◽  
Eka Murtinugraha
Keyword(s):  
Spectrum Analysis ◽  
Response Spectrum ◽  
Base Shear ◽  
Response Spectrum Analysis ◽  
Existing Building ◽  
Building Model ◽  
Story Drift ◽  
Building Form ◽  
Building Condition

The building model was made by using ETABS’s software version 9.7.1. Method that was used for earthquake analysis was response spectrum analysis. Result of this research showed that application of two columns dilatation produced different structure behavior when it applied on lengthways direction (X) and breadthways direction (Y) of existing building. Dilatation variation that was given on lengthways direction (X) of building produced better behaviors. More regular building form because of dilatation on lengthways direction (X) produced shorter period with bigger base shear. Along with the base shear that accepted by building, the column momen also became bigger. Based on displacement that was produced, application of dilatation on lengthways direction was influenced by re-entrant corner. Configuration of more regular building that has close re-entrant corner to existing building condition produced displacement that close to the existing, that thing was also in line with story drift that was produced. The displacement that was produced by all dilatation variation was still in safe category according to SNI 03-1726-2012. The biggest displacement that happened on X and Y direction was produced by variation 1 as big as 0.824m and 0.817m in a row.

Inelastic analysis of a reinforced concrete shear wall building according to the National Building Code of Canada 2005

2006 ◽  
Vol 33 (7) ◽  
pp. 854-871 ◽  
Author(s):  
M Panneton ◽  
P Léger ◽  
R Tremblay
Keyword(s):  
Reinforced Concrete ◽  
Three Dimensional ◽  
Time History ◽  
Shear Walls ◽  
Shear Wall ◽  
Fundamental Period ◽  
Building Code ◽  
Base Shear ◽  
Inelastic Analysis ◽  
The Impact

An eight-storey reinforced concrete shear wall building located in Montréal and designed according to the 1995 National Building Code of Canada (NBCC) and the Canadian Standards Association standard CSA-A23.3-94 is studied to evaluate the impact of new requirements for inclusion in new editions of the NBCC and CSA-A23.3. Static and modal analyses were conducted according to the 2005 NBCC (draft 2003) and CSA-A23.3-04 (draft 4) procedures, and three-dimensional dynamic inelastic time history analysis was performed using three earthquake records. The building is braced by four flat shear walls and three cores. Various estimates of the fundamental period of vibration based on empirical expressions presented in the literature or structural models with different stiffness assumptions were examined. The analysis also permitted the study of the displacement and force demand on the lateral load resisting system. It was found that the base shear from the 2005 NBCC is 29% higher than the 1995 NBCC value when code empirical formulae are used for the fundamental period of vibration.Key words: building, shear wall, inelastic seismic response, NBCC, CSA-A23.3 design of concrete structures.

Seismic Analysis for the Subsea Pipeline System

2010 ◽  
Author(s):  
Rosman B. Arifin ◽  
Wan M. Shafrizal B. Wan M. Yusof ◽  
Pengfei Zhao ◽  
Yong Bai
Keyword(s):  
Seismic Wave ◽  
Seismic Analysis ◽  
Ground Deformation ◽  
Time History ◽  
Metal Loss ◽  
Pipeline System ◽  
Wave Impact ◽  
Ground Acceleration ◽  
Permanent Ground Deformation ◽  
The Impact

Seismic activity in Malaysia is very low as earthquakes are infrequent in this region. The strongest measured earthquake magnitude record in this region since 1978 was 4, which had a very low impact on the integrity of pipelines system in Malaysia. Although this is the case, there exists seismic events in the neighbouring regions and such events may impact the operability, stability and safety of Malaysia submarine pipeline systems. Based on this, a pipeline integrity analysis has been carried out to check the pipeline integrity under the seismic influence. The purpose of the analysis includes: • To calculate earthquake response for three PCSB PMO main export pipelines — for each pipeline both buried and unburied conditions will be taken into account. • To understand the characteristics of buried and unburied pipelines under strong earthquakes affecting Malaysia waters. • To determine the peak ground acceleration (PGA) the pipelines can withstand. • To determine the largest permanent ground deformation (PGD) the pipeline can withstand. • To estimate the impact of the metal loss on the pipeline integrity. • To assist PETRONAS to prepare for such severe earthquakes. Two typical methods have been employed to make the analysis: • Time history method is used to calculate both buried and unburied pipeline response. Two typical seismic wave records have been used in the analysis, which will give a better estimation of the pipeline response under the seismic wave impact. • Soil-pipe element method is used to simulate the behavior between the soil and buried pipeline system. Based on choosing the suitable experimental equations, this method can simulate the soil behaviour accurately. This paper discusses results of the seismic analysis. Based on the analysis results, the pipeline system will be safe under the seismic wave impact. More attention should be given to fault hazard, as the pipeline system will been failed under the fault impact. Finally, the metal loss will be taken into consideration, for the pipeline stress will be much higher due to great metal loss. All those analysis results will be further utilised to estimate the pipeline response in the case of the earthquake.

scholarly journals Comparative Study of Seismic Analysis of Pier Supported on Pile as per IRC:6-2017 and IRC SP:114-2018

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Vivek Gajera ◽  
V. R. Panchal ◽  
Vishal Vadgama
Keyword(s):  
Seismic Analysis ◽  
Bridge Piers ◽  
Base Shear ◽  
Seismic Behaviour ◽  
Reinforced Concrete Bridge ◽  
Reinforced Cement ◽  
Acceleration Method ◽  
Vertical Ground ◽  
The Impact ◽  
Crucial Part

This paper depicts the study of seismic analysis of reinforced concrete bridge piers as per provisions of Indian Road Congress (IRC) guidelines. Bridges are designed having two main structural elements named – “Superstructure” and “Substructure”. Superstructure consists of deck and supporting girder/truss system below deck. Substructure includes Abutments, Piers, Portals and Foundations. Amongst these, Abutments/Piers are crucial part of bridge. Therefore, as per the seismic design philosophy, it is necessary to study the seismic behaviour of bridge piers. With the advancements in technology and subsequent researches in Infrastructure fields, IRC guidelines are updated and revised time-to-time. Introduction of IRC SP:114-2018 guideline for earthquake forces in bridges is an example of such developments. In this research, seismic analysis of Reinforced Cement Concrete (RCC) bridge pier is carried out as per provisions of prevailing guideline IRC:6-2017. Base shear value of IRC:6-2017 is compared with IRC SP:114-2018 which now supersedes seismic provisions of IRC:6-2017. For analysis, different span lengths of 25 m, 30 m and 36 m are used. To assess the impact of height of piers in earthquake analysis, various pier heights such as 10 m, 20 m and 30 m are assumed. The analysis is carried out as per Elastic Seismic Acceleration Method with consideration of different zones and importance of the bridge as per IRC guidelines. Effect of vertical ground motion is also considered in analysis. From analysis, it is observed that base shear and vertical forces have been increased remarkably as per IRC SP:114-2018 compared to IRC:6-2017.

scholarly journals Seismic bridge pier analysis for pile foundation by force and displacement based approaches

2015 ◽  
Vol 13 (2) ◽  
pp. 155-166
Author(s):  
NP.R. Singh ◽  
Hemant Vinayak
Keyword(s):  
Pile Foundation ◽  
Seismic Analysis ◽  
Slenderness Ratio ◽  
Soft Soil ◽  
Time History ◽  
Bridge Pier ◽  
Base Shear ◽  
Displacement Based ◽  
Shear Demand ◽  
Analytical Approaches

Seismic analysis of bridge pier supported on pile foundation requires consideration of soil-pile-structure (kinematic and inertial) interactions. This paper presents the design forces generated for bridge piers with varying height and constant diameter for medium and soft soils in earthquake probability zones considering contribution of soil-pile-structure interactions by developed analytical approaches. The results have shown that the difference in base shear demand between force based and displacement based approach and that between capacity spectrum and displacement based method in general decreases with the increase in slenderness ratio of the pier. The base shear demand by non-linear time history analysis has been found to be much higher compared to that by other methods. The relationship between height and pier cross-section has been developed for different soils and seismic zones such that the base shear demands by force based and displacement based method are of the same order. The overall value of the slenderness ratio works out to be such that failure of the pile shall be as a short column for both medium and soft soil.

scholarly journals Soil-pile-structure interaction effects on high-rise building under seismic shaking

2019 ◽  
Vol 2 (1) ◽  
pp. 153-164
Author(s):  
Umesh Jung Thapa ◽  
Ramesh Karki
Keyword(s):  
Soil Structure ◽  
Seismic Analysis ◽  
Time History ◽  
Soil Structure Interaction ◽  
Base Shear ◽  
Structure Interaction ◽  
High Rise ◽  
High Rise Building ◽  
History Analysis ◽  
Fixed Base

In this paper, study of the response (base shear, time period, storey drift, storey displacement) of a structure is done for the tall building including basement with fixed base and with pile foundation considering Soil Structure Interaction (SSI). Finite element based program ETABS2016 v16.1.0 is used for the analysis of the superstructure. Seismic analysis is done to get the dynamic response of superstructure for two types of model,one model is with fixed baseand second is Model with Winkler spring for Chhaya Center, Thamel, a high rise building with 14 story including double basements. Itisobserved with the consideration of Soil Structure Interaction (SSI). The soil is replaced by spring and assigned at joints. El Centro earthquake (1940) is used for time history analysis. The response obtained due to SSI effect is compared with fixed based model. Results of analysis presented include the comparison of natural periods, base shears, displacements and overturning moment. It is observed that the natural periods increase and the base shears decrease as the base become more flexible.

scholarly journals Seismic Analysis for Multi-Story Building Horizontally Damped Above Basement Level

2018 ◽  
Vol 7 (2.29) ◽  
pp. 955
Author(s):  
Mohammed Ziauddin Patowary ◽  
Abdul Kadir Marsono
Keyword(s):  
Seismic Analysis ◽  
Numerical Study ◽  
Time History ◽  
Seismic Energy ◽  
Ground Level ◽  
Time History Analysis ◽  
Base Shear ◽  
History Analysis ◽  
Natural Time ◽  
Story Building

Due to the urbanization multi-story building with underground story for parking space and storage are very common in practice. Now a day, seismic energy dissipating devices are being used for various types of structures and located in basements which are difficult to maintain.  The main objective is to evaluate the effectiveness of horizontal dampers in the ground floor level of the multi-story building above basement. Among different types of dampers, visco-elastic [VE] dampers are used for this numerical study. Comparing with other types of passive energy dissipating devices, visco-elastic [VE] dampers are considered most suitable. For the better understanding of the effectiveness of horizontal dampers, stiff foundation system is considered thus soil-structure interaction is omitted. In this numerical study, seismic response of different hypothetical structures analyzed having different underground stories and horizontal dampers only in the ground level. Modeling and analysis of the structures and installation of the dampers are done by using finite element modeling software [ETABS]. Time history analysis was used to simulate the response of the structures. Sabah earthquake [05/June/2015] with the PGA of 0.126g was used for the time history analysis. Different dynamics parameters such as natural time period, displacement, base shear and inter-story drift were evaluated. Changes in the results among the structures demonstrated the efficiency of horizontal dampers. Optimum locations of the horizontal dampers were also revealed in this study in the basis of the analysis results.  

scholarly journals Comparison and analysis of seismic isolation, energy dissipation structure and traditional seismic structure

2021 ◽  
Vol 248 ◽  
pp. 01001
Author(s):  
Shu-jiang Jiang ◽  
Shun-zhong Yao ◽  
De-wen Liu
Keyword(s):  
Seismic Isolation ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Seismic Structure ◽  
Base Shear ◽  
Finite Element Software ◽  
History Analysis ◽  
Rare Earthquake ◽  
Nonlinear Time History ◽  
The Impact

This paper uses SAP2000 finite element software to perform nonlinear time history analysis of nine structural systems, and compares the period, total floor displacement, base shear force, vertex displacement, and top acceleration of the structure under the action of an 8-degree rare earthquake. The research results show that seismic isolation and damping technology can effectively reduce the impact of earthquakes on structures.

scholarly journals Effect of a Near Fault on the Seismic Response of a Base-Isolated Structure with a Soft Storey

2017 ◽  
Vol 25 (4) ◽  
pp. 34-46
Author(s):  
B. Athamnia ◽  
A. Ounis ◽  
M. Abdeddaim
Keyword(s):  
Seismic Isolation ◽  
Seismic Analysis ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Base Shear ◽  
Rc Structures ◽  
Soft Storey ◽  
Near Fault ◽  
Nonlinear Time History ◽  
Far Fault

AbstractThis study focuses on the soft-storey behavior of RC structures with lead core rubber bearing (LRB) isolation systems under near and far-fault motions. Under near-fault ground motions, seismic isolation devices might perform poorly because of large isolator displacements caused by large velocity and displacement pulses associated with such strong motions. In this study, four different structural models have been designed to study the effect of soft-storey behavior under near-fault and far-fault motions. The seismic analysis for isolated reinforced concrete buildings is carried out using a nonlinear time history analysis method. Inter-story drifts, absolute acceleration, displacement, base shear forces, hysteretic loops and the distribution of plastic hinges are examined as a result of the analysis. These results show that the performance of a base isolated RC structure is more affected by increasing the height of a story under nearfault motion than under far-fault motion.

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