scholarly journals A Comparative Study on Different Exterior Vertical Grid System in Tall Building

2021 ◽  
pp. 392-402
Author(s):  
Kutbuddin A Ranpurwala ◽  
Vimlesh V Agrawal ◽  
Vishal B Patel
Keyword(s):  
Comparative Study ◽  
Urban Areas ◽  
Large Scale ◽  
Tall Buildings ◽  
Lateral Load ◽  
Frame Structure ◽  
Seismic Load ◽  
Base Shear ◽  
Tube System ◽  
Vertical Grid

The large-scale urbanization in the country and shortage of land in urban areas for accommodating the vast population migrating thereto is being addressed through vertical developments in the form of tall buildings. Tall buildings are generally governed by lateral load, so the selection of an appropriate lateral load resisting system is of much importance. One of the efficient lateral load resisting systems is the tube system. Diagrid and Hexagrid are a form of the tube system. In this research a comparative study is carried out between frame Structure, diagrid, horizontal hexagrid, and vertical Hexagrid to resist lateral load along with the gravity load by varying various parameters. Around 120 models were analyzed in ETABS software with different parameters like Module height, module angle, Building Height, Soil type, and Column location. Seismic load are applied as per Indian code. The results are compared in terms of Base Shear, Storey drift, Storey displacement, and Time period.

scholarly journals Seismic Analysis of L-Shape Multi-Storey RCC Building with X-Bracing in Different Effective Location and Pattern

2021 ◽  
Vol 9 (8) ◽  
pp. 1150-1170
Author(s):  
Mr. Suryakant Pandey
Keyword(s):  
Large Scale ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Bending Moment ◽  
Engineering Industry ◽  
Frame Structure ◽  
Base Shear ◽  
High Rise ◽  
The Face ◽  
Seismic Forces

Abstract: In this day and age of urbanization, there is a strong need for a large-scale high-rise apartment building in every city but high-rise construction systems are extremely difficult to construct in any seismic region due to the intense and disruptive nature of seismic forces. Seismic forces have the highest risk of causing the most harm to high-rise buildings. To meet this need, the Civil Engineering industry is constantly developing new groundbreaking techniques. To solve this problem RCC or steel bracings are provided in high-rise buildings which help to the low down the effect of seismic and wind forces. The main objective of this paper is to locate an effective position and pattern of the RCC X-bracing system in the L- shape multi-storey building which is subjected to seismic forces. According to a previous reference paper, X-bracing produces better results than other bracing systems. Analysis the seven types of frame models are taken – (1) Normal L-shape building without bracing, (2) Xbracing are provided at the face of L-shape building, (3) X-bracing are provided alternative pattern at the face of L-shape building from bottom to top floor, (4) X- bracing are provided zig-zag pattern at the face of L-shape building, (5) X-bracing are provided at the corner of L-shape building, (6) X-bracing are provided alternative pattern at the corner of L-shape building from bottom to the top floor, (7) X-bracing are provided zig-zag pattern at the corner of L-shape building. Developed and evaluated by response spectrum analysis method (Linear dynamic analysis) as per IS 1893-2000 using STAAD PRO V8i. In the present work G+12 storey, the L-shape frame structure is analyzed by using X-bracing. It is analyzed and the results of the Following Parameters are taken - (1) Peak storey shear, (2) Base shear, (3) Nodal displacement, (4) Maximum bending moment, (5) Total quantity of steel in the whole structure, (6) Total volume of concrete in the whole structure are evaluated and compared. Keywords: RCC Bracing, Seismic Behavior, Seismic Analysis, Peak Storey Shear, Base shear, Nodal Displacements, Maximum Bending Moment, The Total Quantity of Steel, The Total Volume of Concrete

scholarly journals The Effect of Shear Wall Configuration on Seismic Performance in the Hotel Building

2018 ◽  
Vol 159 ◽  
pp. 02074
Author(s):  
Daud Rahmat Wiyono ◽  
Roi Milyardi ◽  
Cindrawaty Lesmana
Keyword(s):  
Seismic Performance ◽  
Structural Damage ◽  
Shear Wall ◽  
Lateral Load ◽  
Dual System ◽  
Frame Structure ◽  
Seismic Load ◽  
Time Period ◽  
Story Drift ◽  
Slender Columns

Earthquake effects on the buildings must be evaluated within the current standard provision. The shape of building gives a unique seismic performance on the structure. In typical hotel building, the lobby area in the first floor usually has some slender columns due to the needs of higher clearance to give a widely space area. The slender columns in the big hall tends to create asymmetric building and torsional behaviour on seismic performance. This behaviour is one of the most frequent source of structural damage and failure. One of the solution is to add shear wall in elevator area. The purpose of this paper is to seek the effect of shear wall configuration in elevator area on the seismic performance through numerical analysis. There are some requirements for structural analysis under seismic load, such as: time period, modal analysis, story drift, and other details. In building with dual system, story shear in frame at each level must carry over 25 % of total story shear at that level. In this study, an eleven-storey hotel building located in Tanjung Pinang City, Indonesia was evaluated due to gravity and seismic load. For the building, the requirements of the time period from the standard are 1.21 sec (minimum) and 1.70 sec (maximum). As results, two-sided shear wall in X direction and two-sided shear wall in Y direction is recommended because it has the best seismic performance, time period below the minimum, story drift below allowable, the dynamic lateral load has meet minimum requirement (85% Static Load), and frame structure has carry more than 25% lateral load in dual system building.

scholarly journals Effect of Infill Wall on Plan Irregular Tall Structure

2020 ◽  
Vol 9 (4) ◽  
pp. 3273-3285
Keyword(s):  
Response Spectrum ◽  
Tall Buildings ◽  
Tall Building ◽  
Seismic Load ◽  
Seismic Zone ◽  
Base Shear ◽  
Infill Wall ◽  
Modeling And Analysis ◽  
Importance Factor ◽  
Almost All

In the present study, the behavior of plan irregular (C, T, I shaped irregular building and regular building) tall building subjected to the seismic load alongwith the importance of infill wall is considered. The modeling and analysis of (G+14) storey structure for seismic zone (III), soil type (II) with importance factor (1) and M20 grade concrete are carried out, by equivalent static and response spectrum method, as per IS 1893-2016(Part-1), using E-tabs 2015 commercially available software.. The results obtained are discussed in terms of base shear, storey displacement and storey drift. Many critical observations are drawn from the analysis. From these critical observations, it is concluded that, in almost all shape of plan irregular tall buildings, storey displacement and storey drift are found to be more in bare frame when compared with infill frame, whereas the base shear will be less in bare frame compared with infill frame. However, the results obtained amongst the different shapes, indicates that C, I and regular shaped tall building are yielding lesser storey displacement and storey drift compared to T shaped building. Presence of infill walls will increase the stiffness of the frame.

Simulation of Seismic Load Resistance of Core-Walls for Tall Buildings

2011 ◽  
Vol 82 ◽  
pp. 386-391 ◽  
Author(s):  
Susumu Kono ◽  
Kohei Sakamoto ◽  
Masanobu Sakashita
Keyword(s):  
Seismic Performance ◽  
Axial Load ◽  
Numerical Models ◽  
Load Capacity ◽  
Concrete Strength ◽  
Tall Buildings ◽  
Lateral Load ◽  
Loading Path ◽  
Seismic Load ◽  
Concrete Core

This paper addresses the seismic performance of core-walls based on an experiment and numerical analysis on two 1/7.5 scaled L-shaped concrete core-wall specimens. Concrete strength was 77 MPa and the yield strength of vertical reinforcement was over 700MPa. Test variable was the loading path on the axial load – lateral load relation. Axial load was varied as high as 6MN or 50% of the axial load capacity for one specimen and 4.2MN or 35% for the other specimen as a linear function of the lateral load. The lateral load-drift relations were recorded with local deformation and damage, focusing on the yield of reinforcement and crushing of concrete. Damage of columns was severe and indicated the importance of good confinement at this region for better seismic performance. The numerical models with finite shell elements well simulated the intensity and extent of damage in addition to backbone curves of lateral load - drift angle relations when the pullout of longitudinal reinforcement of columns is considered.

scholarly journals Effect of Infill Wall on Vertical Irregular Tall Structure

2019 ◽  
Vol 9 (1) ◽  
pp. 1488-1495
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Frame Structure ◽  
Seismic Load ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Infill Wall ◽  
Soft Storey ◽  
Infilled Frame ◽  
Tall Structure

In reinforced concrete (RC) frames, the masonry infill walls are used to fill the gaps between the two columns and one horizontal beam which form the single bay. Stiffness of this bay or reinforced concrete frame structure increases by filling the gap between the bays of a structure. The present study investigates that the influence of the infill wall in the vertical irregular tall structure with bottom soft storey and the behavior of (G+14) storey building subjected to seismic load. The study carries different type of models which are regular frame, regular full infilled frame, regular infilled with 15% central opening frame and regular infilled with 15% corner opening frame are analysed. Similarly the same study has been extended for vertical irregular bare frame, inverted vertical irregular bare frame. This study is made for a case applicable to earthquake zone (III), soil type (II) with importance factor (1) and M20 grade of concrete. The analysis is performed using the equivalent static method and response spectrum method as per IS 1893-2016 using E-Tabs 2015 commercially available software. The parameters considered for study are storey displacement, storey drift and base shear. The results obtained for storey displacement and storey drift, in the infilled frame are reduced due to presence of infill wall. However, as expected, the base shear is increased from bare frame to infilled frame.

Engineering in the time of cholera: overcoming institutional and political challenges to rebuild Zimbabwe's water and sanitation infrastructure in the aftermath of the 2008 cholera epidemic

2013 ◽  
Vol 3 (2) ◽  
pp. 222-229 ◽  
Author(s):  
Clarissa Brocklehurst ◽  
Murtaza Malik ◽  
Kiwe Sebunya ◽  
Peter Salama
Keyword(s):  
Urban Areas ◽  
Large Scale ◽  
Humanitarian Aid ◽  
Urban Systems ◽  
Political Crisis ◽  
Rapid Improvement ◽  
Cholera Epidemic ◽  
Rapid Action ◽  
Water And Sanitation Infrastructure ◽  
Urban Rehabilitation

A devastating cholera epidemic swept Zimbabwe in 2008, causing over 90,000 cases, and leaving more than 4,000 dead. The epidemic raged predominantly in urban areas, and the cause could be traced to the slow deterioration of Zimbabwe's water and sewerage utilities during the economic and political crisis that had gripped the country since the late 1990s. Rapid improvement was needed if the country was to avoid another cholera outbreak. In this context, donors, development agencies and government departments joined forces to work in a unique partnership, and to implement a programme of swift improvements that went beyond emergency humanitarian aid but did not require the time or massive investment associated with full-scale urban rehabilitation. The interventions ranged from supply of water treatment chemicals and sewer rods to advocacy and policy advice. The authors analyse the factors that made the programme effective and the challenges that partners faced. The case of Zimbabwe offers valuable lessons for other countries transitioning from emergency to development, and particularly those that need to take rapid action to upgrade failing urban systems. It illustrates that there is a ‘middle path’ between short-term humanitarian aid delivered in urban areas and large-scale urban rehabilitation, which can provide timely and highly effective results.

scholarly journals Modeling Spatiotemporal Population Changes by Integrating DMSP-OLS and NPP-VIIRS Nighttime Light Data in Chongqing, China

2021 ◽  
Vol 13 (2) ◽  
pp. 284
Author(s):  
Dan Lu ◽  
Yahui Wang ◽  
Qingyuan Yang ◽  
Kangchuan Su ◽  
Haozhe Zhang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Relative Error ◽  
Urban Areas ◽  
Large Scale ◽  
Population Distribution ◽  
Spatial Optimization ◽  
Distribution Data ◽  
Mountainous Areas ◽  
Mean Relative Error ◽  
Nighttime Light

The sustained growth of non-farm wages has led to large-scale migration of rural population to cities in China, especially in mountainous areas. It is of great significance to study the spatial and temporal pattern of population migration mentioned above for guiding population spatial optimization and the effective supply of public services in the mountainous areas. Here, we determined the spatiotemporal evolution of population in the Chongqing municipality of China from 2000–2018 by employing multi-period spatial distribution data, including nighttime light (NTL) data from the Defense Meteorological Satellite Program’s Operational Linescan System (DMSP-OLS) and the Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (NPP-VIIRS). There was a power function relationship between the two datasets at the pixel scale, with a mean relative error of NTL integration of 8.19%, 4.78% less than achieved by a previous study at the provincial scale. The spatial simulations of population distribution achieved a mean relative error of 26.98%, improved the simulation accuracy for mountainous population by nearly 20% and confirmed the feasibility of this method in Chongqing. During the study period, the spatial distribution of Chongqing’s population has increased in the west and decreased in the east, while also increased in low-altitude areas and decreased in medium-high altitude areas. Population agglomeration was common in all of districts and counties and the population density of central urban areas and its surrounding areas significantly increased, while that of non-urban areas such as northeast Chongqing significantly decreased.

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