Parametric stress distribution and displacement functions for tall buildings under lateral loads

2012 ◽  
Vol 23 (1) ◽  
pp. 22-41 ◽  
Author(s):  
Reza Rahgozar ◽  
Ali Reza Ahmadi ◽  
Mostafa Ghelichi ◽  
Younes Goudarzi ◽  
Mohsen Malekinejad ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Tall Buildings ◽  
Lateral Loads

scholarly journals Seismic Performance of Bracing, Diagrid and Outrigger System

2020 ◽  
Vol 9 (7) ◽  
pp. 32-36
Keyword(s):  
Seismic Performance ◽  
Tall Buildings ◽  
Lateral Load ◽  
Lateral Loads ◽  
Steel Buildings ◽  
Efficient System ◽  
Effective System ◽  
Tension And Compression ◽  
Lateral Bracing ◽  
Bracing System

In this paper bracing, diagrid and outrigger system have been analyzed for comparing the seismic performance of multistorey buildings. Bracing system is a very efficient system which can be used as a lateral load resisting system in concrete and steel buildings, in this system lateral loads are transferred through lateral bracing by undergoing in tension and compression .diagrid is another effective and efficient system that can be used as lateral load resisting system in steel and concrete tall buildings, in this system lateral loads are transferred by inclined members of the building. Another very effective system which commonly used for resisting lateral loads in concrete and steel high rise building is outrigger system, in this system lateral loads will be resisted by outrigger belt truss and core shear wall. Location and number of outrigger and type of bracing is very important which needs to be optimized in this system. In this paper comparison of bracing, diagrid and outrigger system have been studied on a 24 storey by using a standard package of ETABS 2017.

scholarly journals Stability Analysis of High-Rise Buildings by Altering the Beam Members: A Review

2021 ◽  
Vol 9 (10) ◽  
pp. 501-507
Author(s):  
Ankur Nagar
Keyword(s):  
Reinforced Concrete ◽  
Composite Beam ◽  
Concrete Beams ◽  
Tall Buildings ◽  
Reinforced Concrete Beams ◽  
Steel Beams ◽  
Lateral Loads ◽  
Rigid Frame ◽  
Lateral Rigidity ◽  
The Impact

Abstract: For buildings larger than 15 to 20 floors, a system with a clean rigid frame is not adequate because it does not provide the required lateral rigidity and causes excessive deflection of the building. These requirements are met in two ways. By introducing the effective section such as beam, column etc in to the structure. This increases the stability and rigidity of the structure, and also limits the requirement for deformation. Now days the composite beam is also used for tall buildings. The Paper present the short summery report of use of various beam elements in building to get the effective out comes to sustained under the lateral forces response. The literature review focus on the impact on the building analysis by altering the Beam Members. Reinforced Concrete Beams, Steel Beams, and Composite Beams. The articles reviewed the concept on introducing the alternating beam in the structure are effective and achieve the higher resisting capacity against the lateral loads. Keywords: Reinforced Concrete Beams, composite beam, Steel Beams, tall buildings, deformation, stability

scholarly journals Comparative Analysis of RC Building Using Dampers and with Shear Wall under Wind Load: A Review

2021 ◽  
Vol 9 (10) ◽  
pp. 490-495
Author(s):  
Bashar Iqbal
Keyword(s):  
Comparative Analysis ◽  
Tall Buildings ◽  
Shear Wall ◽  
Wind Load ◽  
Lateral Loads ◽  
Human Beings ◽  
Friction Damper ◽  
Wind Analysis ◽  
Highly Sensitive ◽  
Rc Building

Abstract: The requirement of tall building in recent years increase the construction to satisfy the need of human beings. Very tall buildings located in high velocity wind area are highly sensitive therefore calculation and analysis of wind load is very impotent. Due to change in climatic condition the basic wind speed are increases. The main aim of this paper is to introducing the different techniques which is used to reduce the effect of wind load or lateral loads. Keywords: wind analysis, comparative analysis, TMD (tuned mass damper),friction damper, shear wall

COMPARISON OF SHEAR WALLS AND MOMENT-RESISTING FRAMES IN EARTHQUAKE RESISTING BUILDINGS’ DESIGN

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Ahmad Sheikh Abdallah ◽  
Safwan Chahal
Keyword(s):  
Seismic Response ◽  
Tall Buildings ◽  
Shear Walls ◽  
Shear Wall ◽  
Structural Systems ◽  
Lateral Loads ◽  
Building Height ◽  
Seismic Zones ◽  
Prime Concern ◽  
Moment Resisting

The rapid growth of urban population and limited land space have greatly influenced the development of high-rise structures. Lateral loads have an important effect on the design as the building height increases. In order to resist lateral loads, safety and minimum damage should be the prime concern when designing tall buildings. To meet these requirements, the structure should have adequate lateral strength and lateral stiffness and sufficient ductility. Among the various structural systems, shear wall systems or moment resisting frame systems could be a point of choice for designers. Thus, it is important to review and observe the behavior of these systems under seismic effect. This study compared the seismic response of the above structural systems using a case study application at variable seismic zones (Zone 2B, Lebanon Zone, Zone 3, and Zone 4) and at different building stories (Eight and 12-story building). The seismic response is measured in term of time-period, maximum story displacement, maximum story drift, amount of steel and concrete needed. The outcome of this study portrayed that a shear wall system is more efficient in terms of cost and lateral load resistivity regardless of the building height and in the four seismic zones mentioned before.

scholarly journals Shear-lag effect and its effect on the design of high-rise buildings

2018 ◽  
Vol 33 ◽  
pp. 02001 ◽  
Author(s):  
Bui Thanh Dat ◽  
Alexander Traykov ◽  
Marina Traykova
Keyword(s):  
Major Part ◽  
Tall Buildings ◽  
Lateral Load ◽  
Structural Systems ◽  
Lateral Loads ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Main Category ◽  
High Rise ◽  
Lag Effect

For super high-rise buildings, the analysis and selection of suitable structural solutions are very important. The structure has not only to carry the gravity loads (self-weight, live load, etc.), but also to resist lateral loads (wind and earthquake loads). As the buildings become taller, the demand on different structural systems dramatically increases. The article considers the division of the structural systems of tall buildings into two main categories - interior structures for which the major part of the lateral load resisting system is located within the interior of the building, and exterior structures for which the major part of the lateral load resisting system is located at the building perimeter. The basic types of each of the main structural categories are described. In particular, the framed tube structures, which belong to the second main category of exterior structures, seem to be very efficient. That type of structure system allows tall buildings resist the lateral loads. However, those tube systems are affected by shear lag effect - a nonlinear distribution of stresses across the sides of the section, which is commonly found in box girders under lateral loads. Based on a numerical example, some general conclusions for the influence of the shear-lag effect on frequencies, periods, distribution and variation of the magnitude of the internal forces in the structure are presented.

scholarly journals BEHAVIOR OF LARGE-SCALE BRACING SYSTEM IN TALL BUILDINGS SUBJECTED TO EARTHQUAKE LOADS

2013 ◽  
Vol 19 (2) ◽  
pp. 206-216 ◽  
Author(s):  
Ali Hemmati ◽  
Ali Kheyroddin
Keyword(s):  
Large Scale ◽  
Lateral Displacement ◽  
Tall Buildings ◽  
Steel Structure ◽  
Lateral Loads ◽  
Space Truss ◽  
The Face ◽  
Similar Scheme ◽  
Stress Ratios ◽  
Bracing System

Bracing is a highly efficient and economical method of resisting of lateral forces in a steel structure. The most common types of bracing are those that form a fully triangulated vertical truss. These include the concentric and eccentric braced types. In high-rise buildings, the location and number of bracings is an important limitation to the architectural plan. A similar scheme has been used in larger scale spanning multiple stories and bays in tall buildings which is called large-scale bracing system. Large-scale bracing (LSB) is a particular form of a space truss. It consists of multiple diagonal elements that form a diagonal grid on the face of the structure. In this paper, a 20 story steel frame with different arrangement of bracing systems is analyzed. Linear and static nonlinear (push-over) analyses are carried out and the results presented here. Analytical results show that, the large-scale bracing is more adequate system under the lateral loads. Using LSB in tall buildings, decreases the lateral displacement, drift ratio, uplift forces in foundation and increases the ductility and shear absorption percent of the bracing system. Moreover, the stress ratios in the structural members of LSB system are less than the relevant values in other bracing systems.

scholarly journals Behaviour of Exoskeleton Structures under Wind Loading

2019 ◽  
Vol 9 (2) ◽  
pp. 2469-2473
Keyword(s):  
Inner Core ◽  
Tall Buildings ◽  
Wind Loading ◽  
Seismic Loads ◽  
Lateral Loads ◽  
Structural System ◽  
Story Structure ◽  
Gust Factor ◽  
Gravity Load ◽  
Tall Structure

Tall buildings structural system has evolved a lot in recent times. Nowadays, a new system is being in the building as two parts namely exterior system and interior core. The exterior system will be located in the perimeter of the structure whereas the inner core located at the center which mainly accounts for the transfer of gravity load and the exterior system takes care of lateral loads rather than gravity load. The exterior shell is nothing but a diagonal grid which are effective as both gravity and lateral support to the tall buildings and this structural system is named as Exoskeleton. This exoskeleton diagrid structures imparts greater stiffness and lateral stability to the slender tall buildings. The objective of this study is to obtain a shape efficient lateral load resisting exoskeletal system using diagrid elements. Hence, the steel exoskeleton structures are analysed separately for both wind and seismic loads using ETABS 2015. 72-story structure with plan area of 2500 m2 adopted with different base plan (octagonal, rectangular and triangular shapes) with aspect ratio less than 5 has analyzed and designed. Gust factor method is adopted for wind loading since the tall structure undergoes vibration for various acceleration of the wind. The Gusts factor various from 1.19 to 2.11 in the design. Several analytical studies were conducted for different base plan with various diagrid angles and then this paper focus on obtaining a shape effective structure with optimal diagrid angles say 55.5, 65.7, 77.8 degree under adverse loading condition. Moreover, this work is done by considering following parameters say interstory drift, shear absorbing performance, the behaviour of inner core and outer shell

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