scholarly journals 1) FORMULAS OF BASE SHEAR COEFFICIENT AND PERIOD APPLIED IN EARTHQUAKE DESIGN OF TALL BUILDINGS

1962 ◽  
Vol 79 (0) ◽  
pp. 1-5
Author(s):  
TADASHI TANIGUCHI
Keyword(s):  
Tall Buildings ◽  
Base Shear ◽  
Shear Coefficient ◽  
Earthquake Design

Response of higherise buildings to ground motion from underground nuclear detonations

1969 ◽  
Vol 59 (6) ◽  
pp. 2343-2370
Author(s):  
John A. Blume
Keyword(s):  
Ground Motion ◽  
Las Vegas ◽  
Spectral Response ◽  
Vertical Plane ◽  
Time History ◽  
Tall Buildings ◽  
Response Spectra ◽  
Statistical Parameters ◽  
Typical Data ◽  
Earthquake Design

abstract Typical data obtained thus far in the AEC nuclear test program on the response of highrise Las Vegas buildings to ground motion from distant nuclear events including Boxcar and Benham are presented, together with measured building response to distant earthquakes and to wind gusts. Major variations in response spectra are shown over the city for a specific event, from period band to period band at the same location for different events, and statistical parameters are shown for the randomness of spectral response. The peak response of tall buildings is shown for the top levels in translation and in orbital motion, and in the vertical plane with simultaneous multi-level measurements. The variation of peak modal response is shown with elapsed time, modal combinations are noted, and an example of time-history computed response is compared to measured response. It is shown that highrise Las Vegas buildings respond to ground motion with considerable amplification, that the fundamental modes tend to dominate the peak responses although there are exceptions, that there can be significant modification of loading conditions because of simultaneous motion in the two horizontal axes even though a building is symmetric, and that some building periods vary with amplitude and history of non-damaging prior response while others do not. In general there are indications that code earthquake design criteria are by no means conservative.

scholarly journals Controlling Seismic Excitation in the RCC Building with a Tuned Mass Damper

2021 ◽  
Vol 1197 (1) ◽  
pp. 012039
Author(s):  
Avinash Kalamkar ◽  
N.H. Pitale ◽  
P.B. Patil
Keyword(s):  
Seismic Analysis ◽  
Tall Buildings ◽  
Seismic Excitation ◽  
Earthquake Response ◽  
Contemporary History ◽  
Base Shear ◽  
Tuned Mass Dampers ◽  
Rc Structures ◽  
Mass Damper ◽  
The Time Domain

Abstract The use of multiple tuned mass dampers (MTMDs) to monitor earthquake response of tall buildings is investigated. The MTMDs are located in three locations in the reinforced concrete (RC) structures. The time domain seismic analysis is performed on Etabs Software using imperial Earth movement used to analyze contemporary history. The performance of the MTMDs is compared to that of a TMD on the top floor, a TMD on the third and fifth floors, a TMD on each floor, and no TMD. The base shear vs time and displacement parameters were examined, and it was determined that the MTMDs on each floor are better for the building’s seismic response. Furthermore, it has been discovered that MTMDs are more powerful than STMDs.

scholarly journals An Investigation of the Fundamental Period of Vibration for Moment Resisting Concrete Frames

2019 ◽  
Vol 5 (12) ◽  
pp. 2626-2642
Author(s):  
Ahmed Nader Mohamed ◽  
Khaled F. El Kashif ◽  
Hamed M. Salem
Keyword(s):  
Dynamic Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Reduction Factor ◽  
Fundamental Period ◽  
Base Shear ◽  
Empirical Formulas ◽  
Moment Resisting Frames ◽  
Element Size ◽  
Moment Resisting ◽  
Earthquake Design

The determination of fundamental period of vibration for structures is essential to earthquake design. The current codes provide empirical formulas to estimate the approximated fundamental period and these formulas are dependent on building material, height of structure or number of stories. Such a formulation is excessively conservative and unable to account for other parameters such as: length to width ratios, vertical element size and floors area. This study investigated the fundamental periods of mid-rise reinforced concrete moment resisting frames. A total of 13 moment resisting frames were analyzed by ETABS 15.2.2, for gross and cracked eigenvalue analysis and Extreme Loading for Structures Software® or ELS, for non-linear dynamic analysis. The estimated periods of vibration were compared with empirical equations, including current code equations. As expected, the results show that building periods estimated based on simple equations provided by earthquake design codes in Europe (EC8) and America (UBC97 and ASCE 7-10) are significantly smaller than the periods computed using nonlinear dynamic analysis. Based on the results obtained from the analyzed models, equations for calculating period of vibration are proposed. These proposed equations will allow design engineers to quickly and accurately estimate the fundamental period of moment resisting frames with taking different length to width ratios, vertical element size, floors area and building height into account. The interaction between reduction factor and the reduced period of vibration is studied, and it is found that values of maximum period of vibration can be used as an alternative method to calculate the inelastic base shear value without taking reduction factors in consideration.

scholarly journals Seismic Performance of Flat Slab in Tall Buildings with and without Shear wall

2019 ◽  
Vol 9 (1) ◽  
pp. 2672-2675 ◽  
Keyword(s):  
Seismic Performance ◽  
Lateral Displacement ◽  
Tall Buildings ◽  
Shear Wall ◽  
Lateral Force ◽  
Modern Trend ◽  
Base Shear ◽  
Flat Slab ◽  
Industrial Buildings ◽  
Time Period

Tall buildings structure has been a considerable increase in both residential and commercial as well as modern Trend structures. There are two systems comprise the most attractive and commonly used now a days are flat slab and shear wall system. Flat slab is most widely used system in reinforced concrete construction in offices, industrial buildings etc. It supports floor slab without beams. When it comes to seismic performance or lateral force flat slab tall buildings without shear wall is relatively less when compared to with shearwall.in this study I have done two models of flats slab tall buildings one with shear wall and another one without shear wall by using ETABS software. The comparison of analysis results will take place in order to see how both a buildings are performing under lateral and seismic loads and finding a seismic parameters like time period, base shear, lateral displacement, and storey displacement are checked out.

scholarly journals Effect Of Vertical Geometric And Mass Irregularities In Structure

10.29007/6pnf ◽  
2018 ◽  
Author(s):  
Kevin Shah ◽  
Prutha Vyas
Keyword(s):  
Masonry Wall ◽  
Vertical Position ◽  
Lateral Loads ◽  
Base Shear ◽  
Zone Structure ◽  
Soft Storey ◽  
Earthquake Design ◽  
Infill Masonry ◽  
Earthquake Zone ◽  
G 14

Earthquake design plays major role in designing of any structure. The base shear is developed during an earthquake in a structure. The base shear is calculated by using the codes IS 1893:2002 (Part–1). The study includes the calculations of storey shear, storey drift and storey displacement of G+14 building which is situated in zone-5 with different irregularities. Irregularities are crucial in studying the seismic behavior of building. The irregularities considered are mass irregularity and vertical geometric irregularity. The mass irregularity has first floor without masonry wall and rest of floor with infill masonry wall i.e. soft storey and vertical geometric irregularity has uneven geometry in vertical position & shape of building. In very severe earthquake zone, structure fail due to high lateral loads in this project lateral loads are considered in both direction (EQX & EQY). The modelling and calculations of building are done using ETABS.

scholarly journals Investigation responses of the diagrid structural system of high-rise buildings equipped with Tuned mass damper using new dynamic method

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Arash Karimipour ◽  
Mansour Ghalehnovi ◽  
Mahmoud Edalati ◽  
Mehdi Barani
Keyword(s):  
Dynamic Method ◽  
Lateral Displacement ◽  
Tall Buildings ◽  
Tuned Mass Damper ◽  
Structural System ◽  
Base Shear ◽  
Structural Behaviour ◽  
High Rise ◽  
Mass Damper ◽  
Story Drift

Due to the shortage of land in cities and population growth, the significance of high rise buildings has risen. Controlling lateral displacement of structures under different loading such as an earthquake is an important issue for designers. One of the best systems is the diagrid method which is built with diagonal elements with no columns for manufacturing tall buildings. In this study, the effect of the distribution of the tuned mass damper (TMD) on the structural responses of diagrid tall buildings was investigated using a new dynamic method. So, a diagrid structural systems with variable height with TMDs was solved as an example of structure. The reason for the selection of the diagrid system was the formation of a stiffness matrix for the diagonal and angular elements. Therefore, the effect of TMDs distribution on the story drift, base shear and structural behaviour were studied. The obtained outcomes showed that the TMDs distribution does not significantly affect on improving the behaviour of the diagrid structural system during an earthquake. Furthermore, the new dynamic scheme represented in this study has good performance for analyzing different systems. 

scholarly journals Dynamic Response of Tall Building with Base Isolation Subjected to Earthquake Forces

2019 ◽  
Vol 9 (2) ◽  
pp. 4157-4166
Keyword(s):  
Base Isolation ◽  
Linear Time ◽  
Time History ◽  
Tall Buildings ◽  
Ground Vibration ◽  
Tall Building ◽  
Structural Vibration ◽  
Control Technique ◽  
Base Shear ◽  
Seismic Behaviour

In the fast-paced contemporary world, new inventions with rapid construction techniques came across usually built to resist the lateral forces. Among them, the demand for tall buildings has put a revolutionary impact on society. In this study, base isolation as an earthquake resisting design technique was utilized which substantially dissociate a superstructure from its substructure and increase flexibility resisting on the ground vibration areas by providing the different types of base isolators. Lead rubber bearing (LRB) isolator is a passive structural vibration control technique. In this research study, seismic behaviour of tube in tube system steel tall building in square, circular, hexagonal, and octagonal plan configurations with varying frame sections with and without LRB base isolation was analyzed for the comparative analysis on the basis of base shear, overturning moment, time period, storey displacement, storey drift and storey acceleration according to IS 1893 (part 1):2016 and UBC 1997 Earthquake code in E-TABS software by non-linear time history analysis. From the results, Octagonal shape was found to be the best option for tall buildings whereas the hexagonal shaped building showed poor performance during an earthquake.

scholarly journals Effect of foundation compliance on earthquake stresses in multistory buildings*

1954 ◽  
Vol 44 (4) ◽  
pp. 551-569
Author(s):  
R. G. Merritt ◽  
G. W. Housner
Keyword(s):  
Tall Buildings ◽  
Strong Motion ◽  
Analog Computer ◽  
Fundamental Period ◽  
Base Shear ◽  
Shear Forces ◽  
Multistory Buildings ◽  
Building Models ◽  
Wide Range ◽  
Building Practice

Abstract This paper shows the quantitative effect that foundation compliance has on the maximum base shear force and the fundamental period of vibration in typical tall buildings subjected to strong-motion earthquakes. A study was made of five-, ten-, and fifteen-story building models on the Electric Analog Computer, subjecting them to the ground accelerations of actual earthquakes. The base shear forces were measured, the foundation compliance of the models being changed through a very wide range. The properties specified for the building models are shown to be similar to the properties found in real buildings. The experimental results imply that the maximum base shear forces in typical buildings of five stories and higher during strong-motion earthquakes will be essentially unaffected by any degree of foundation compliance that can be expected in normal building practice. The fundamental period of typical buildings will be increased by about 10 per cent if the foundation compliance is the maximum that can be expected in standard building practice.

scholarly journals Wind Analysis of Tall Buildings for Vertical Irregularity : A Review

2020 ◽  
pp. 121-126
Author(s):  
Syed Mudassir ◽  
Kuldeep Dabhekar ◽  
Syed Faiz ◽  
Isha P. Khedikar
Keyword(s):  
Tall Buildings ◽  
Bending Moment ◽  
Wind Load ◽  
Base Shear ◽  
Structural Behaviour ◽  
Analysis And Design ◽  
Irregular Structure ◽  
Axial Forces ◽  
Tall Structures ◽  
Wind Analysis

Now every day, various buildings are being built for different purposes such as residential, commercial, and industrial etc. In general, in order to stabilize these longitudinal tall structures for both loads such as gravity and lateral (wind and earthquake) loads are required to take when considering the analysis and design. In addition to this there are several types of structures or buildings having different geometry in vertical and horizontal plan in the sense regular or irregular. This paper presents detailed review on the analysis of vertically irregular structure subjected to wind loads, the failure of structure starts from the weak point or joint. This weakness is exacerbated by the uneven distribution of mass, changes in elasticity or stiffness and also changes in the vertical geometry of the structure. Properties that have objections to physical or geometric regularity are referred to as irregular structures. The present study shows a review on analysis and effects in vertical irregular structure under lateral load especially in case of wind load. Many structural software and standard codes are reviewed for the creation of all members under wind load. At the end of this paper concerns the comparison of regular building with irregular structure and describes the effects in vertical irregular structure with the help of structural behaviour such as displacement, drift, axial forces, base shear and bending moment etc.

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