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 Comparative Evaluation of Concentric Bracing Systems for Lateral Loads on Medium Rise Steel Building Structures

2020 ◽  
pp. 124-130
Author(s):  
Sisaynew Tesfaw Admassu
Keyword(s):  
Lateral Displacement ◽  
Level Structure ◽  
Lateral Load ◽  
Frame Structure ◽  
Lateral Stiffness ◽  
Building Structures ◽  
Steel Buildings ◽  
Lateral Strength ◽  
Strength And Stiffness ◽  
Bracing System

To resistance, the lateral load from wind or an earthquake is that the reason for the evolution of varied structural systems. Because, when a medium or any multi-level structure is exposed to horizontal or torsional deflections under the action of seismic burdens. Lateral stiffness is a major consideration in the design of the buildings. In addition to this, many existing steel buildings and reinforced concrete buildings for which the weak lateral stiffness is the main problem; should be retrofitted to conquer the insufficiencies to resist the lateral loading. Lateral load resisting systems are structural elements providing basic lateral strength and stiffness, without which the structure would be laterally unstable. The unstable nature of the structure is solved by the fitting arrangement of bracings systems. A bracing system is that forms an integral part of the frame. Thus, such a structure has to be analyzed before arriving at the best type or effective arrangement of bracing. Bracing is a highly effective strategy of resisting lateral forces in a frame structure. In this document, a ten-story building with incorporated bracing systems is analysed using ETABS 2016 analysis software as per Eurocode and Ethiopian Building Code Standards (EBCS). Then, the lateral displacement is evaluated under each of the bracing types.

scholarly journals Seismic performance evaluation of high-rise steel buildings dependent on wind exposures

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983511
Author(s):  
Seonwoong Kim
Keyword(s):  
Seismic Performance ◽  
Response Spectrum ◽  
Slenderness Ratio ◽  
Lateral Force ◽  
Lateral Load ◽  
Seismic Load ◽  
Strong Wind ◽  
Steel Buildings ◽  
High Rise ◽  
Moderate Seismicity

The lateral load-resisting system of high-rise buildings in regions of low and moderate seismicity and strong wind such as the typhoon in the Korean peninsula considers the wind load as the governed lateral force so that the practical structural engineer tends to skip the evaluation against the seismic load. This study is to investigate wind-designed steel diagrid buildings located in these regions and check the possibility of the elastic design of them out. To this end, first, the diagrid high-rise buildings were designed to satisfy the wind serviceability criteria specified in KBC 2016. Then, the response spectrum analyses were performed under various slenderness ratio and wind exposures. The analyses demonstrated the good seismic performance of these wind-designed diagrid high-rise buildings because of the significant over-strength induced by the lateral load-resisting system of high-rise buildings. Also, the analysis results showed that the elastic seismic design process of some diagrid high-rise buildings may be accepted based on slenderness ratios in all wind exposures.

scholarly journals Seismic performance investigation of new lateral bracing system called “OGrid-H”

2019 ◽  
Vol 1 (4) ◽  
Author(s):  
Maryam Boostani ◽  
Omid Rezaifar ◽  
Majid Gholhaki
Keyword(s):  
Seismic Performance ◽  
Lateral Bracing ◽  
Bracing System

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.

Innovative designs in structural systems for buildings

1979 ◽  
Vol 6 (1) ◽  
pp. 139-167
Author(s):  
J. Keith Ritchie ◽  
Eddie Y. L. Chien
Keyword(s):  
Shear Walls ◽  
Lateral Load ◽  
Structural Systems ◽  
Steel Buildings ◽  
Construction Methods ◽  
Structural Interface ◽  
Tension And Compression ◽  
Building Components ◽  
The One ◽  
Direct Acting

Numerous innovations in the use of structural steel alone or in combination with other structural components have been tried and proven in North America during the past two decades. In numerous other fields of endeavour, mass production allows refinement in both function and cost. However, the 'one-off' approach inherent in both architectural and structural design of buildings on this continent and the broad spectrum of projects (and clients) processed by any single consultant, in spite of any desired level of specialization, allow development of only the low end of the learning curve related to the use of a particular system.This paper sets out with two objectives: the first is to review some of the innovative structural framing systems for steel buildings, presenting the concepts and design details for review by others who only infrequently have opportunities to design a structure falling in one of these categories; the second is to review possible adaptations of these structural systems with the objective of achieving greater construction efficiency and (or) greater economy.Systems reviewed will include concrete-cored, gravity steel-framed structures with a number of alternative construction methods, staggered truss-framing systems, interstitially framed hospital structures with a review of economics and mechanical–structural interface aspects, the stub-girder framing system with Canadian alternatives, steel–concrete composite action of both vertical and horizontal structural members, efficient lateral load-resisting systems such as direct acting tension and compression bracing, including both exterior and interior applications, steel-plate shear walls as lateral load-resisting elements, and combinations of the above.Structural interface with other building components including wall components will receive considerable emphasis, but overall, ways and means of improving productivity in both design and construction will be the primary focal points and objectives of the paper.

scholarly journals Numerical comparison on the efficiency of conventional and hybrid buckling-restrained braces for seismic protection of short-to-mid-rise steel buildings

2019 ◽  
Vol 11 (4) ◽  
pp. 439-454
Author(s):  
M. Alborzi ◽  
H. Tahghighi ◽  
A. Azarbakht
Keyword(s):  
Seismic Performance ◽  
Numerical Comparison ◽  
Steel Buildings ◽  
Response Modification Factor ◽  
Building Frames ◽  
Strain Behavior ◽  
Residual Displacements ◽  
Story Drift ◽  
Residual Deformations ◽  
Bracing System

Abstract Buckling-restrained brace (BRB) is a specific kind of bracing system which has an acceptable energy dissipation behavior in a way that would not be buckled in compression forces. However, considerable residual deformations are noticed in strong ground motions as a result of the low post-yield stiffness of the BRBs. The seismic performance of a modern lateral load resisting system, which is called the hybrid BRB, and its conventional counterpart are assessed and compared in this paper. Multiple plates with different stress–strain behavior are used in the core of this new innovative system, and this is its difference with the existent BRBs. Nonlinear static and incremental dynamic analyses are carried out for three building frames with different structural heights, which use conventional and hybrid BRB systems. To carry out response history analyses, the FEMA P695 far-field earthquake record set was adopted in different hazard levels. The hybrid BRBs are shown to have superior seismic performance in comparison with the conventional systems based on the response modification factor and the damage measures including residual displacements and inter-story drift ratios.

SEISMIC PERFORMANCE OF STRUCTURAL FRAMES AND JOINTS IN WOOD TALL BUILDINGS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Eman Saleh ◽  
Jamshid Mohammadi
Keyword(s):  
Seismic Performance ◽  
Pushover Analysis ◽  
Tall Buildings ◽  
Analytical Models ◽  
Seismic Load ◽  
Lateral Loads ◽  
Frame System ◽  
Structural Frames ◽  
Institute Of Technology ◽  
Frame Systems

There has been a growing interest in using wood in tall buildings by employing cross-laminated timber (CLT) in a structure’s moment frame system. However, still much needs to be learned about the performance of CLT frame systems subject to lateral loads such as earthquakes. The ductility needed in CLT frames in seismic load environments is primarily provided through connections. Thus, a proper connection detail is required to ensure an adequate seismic response, especially at extreme loads. Current strength specifications of connectors are mainly applicable in cases of pure tension or shear; while in real applications, connections are subjected to a combination of these loads. This paper is part of analytical and simulation studies on seismic performance of wood structural frames being conducted at Illinois Institute of Technology. These studies include simulations to investigate: (1) Moment-resistance capacity of CLT panels; and (2) Resistance capacity of typical joints used in CLT frame systems. Limited experimental data available on a 6-story wood frame system are considered as a means of verification of the aforementioned analytical investigations. Focus of this paper is specifically on the significance of interaction between tension and shear as reported in literature. Several interaction equations as implemented in current analytical models for pushover analysis of CLT frames are explained and their adequacy to predict the nonlinear behavior of CLT panels under lateral loads is discussed.

scholarly journals Seismic Performance of Steel Frames with Inverted V-Braces for North Cyprus

2019 ◽  
Vol 9 (1) ◽  
pp. 4314-4320
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Lateral Force ◽  
Load Resistance ◽  
Lateral Load ◽  
Vital Role ◽  
Lateral Load Resistance ◽  
Bracing System

Cyprus Island is located in a high-risk zone, in which the buildings should have lateral load-resistance systems to resist the lateral imposed loads. Bracings play a vital role in the structural behavior of buildings during an earthquake. There are many bracing systems that can be found thorough searching in the literature. However, there are insufficient studies regarding the inverted-V bracing system in accordance with the Northern Cyprus seismic code of NCSC-2015. In this study, the seismic performance of steel structures equipped with various types of inverted-V bracing systems is investigated for mid-rise and high-rise buildings in accordance with NCSC-2015 code. Several steel structure buildings having different lateral load-resistance systems are analyzed under different loading patterns applying ETABS2016 software. For this purpose, linear static equivalent lateral force method (ELFM), nonlinear static (Pushover) and nonlinear dynamic time-history (TH) analyses were adopted. The obtained results in this research indicate that the inverted-V bracing systems dramatically enhance the performance of the steel structures more particularly when the earthquake is applied perpendicular to the weak axis of the columns. This indicates that the inverted-V bracing system is an effective solution to resist the applied lateral loads while maintaining the functionality of the building. By applying the regression analysis some practical equations were submitted for the stiffness factor to be employed in similar cases as a guideline

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