Figure 2 - uploaded by Ibrahim Mousleh
Content may be subject to copyright.
Source publication
The increasing demand of tall buildings and towers in most of the cities creates new challenges for structural designers and architects. The main challenge is to resist the lateral forces with the best choice of the structural system keeping the economical boundaries in mind. One of the most newly used systems is the outrigger, acting to transfer p...
Similar publications
A literature review has been conducted aimed at improving the general understanding of the seismic response of concrete buildings with transfer structures in low-to-moderate seismicity regions. This paper summarizes and discusses the existing codified requirements for transfer structure design under seismic conditions. Based on the previous shaking...
This paper seeks to examine the plastic deformation and seismic structural response of a mega-subcontrolled structural system (MSCSS) subjected to strong seismic excitations. Different MSCSS configurations were modeled with nonlinear finite elements, and nonlinear dynamic analyses were performed to examine their behaviors. This paper introduces a n...
The present work has been performed on 5, 10, 15, and 20 story OMRF and SMRF symmetrical building for all seismic zone as per IS 1893:1984. Building has been modelled in STAAD.Pro. Structure is modelled having 5 bays of 4m along 20m side and 5 bays of 6m along 30m side. Amount of steel required and story drift are taken as parameters of comparison....
![Figure 1. Plan of G+14 Building [Source: Authors]](publication/378666552/figure/fig1/AS:11431281227034284@1709385008302/Plan-of-G-14-Building-Source-Authors_Q320.jpg)
The Open Ground Story (OGS) building is a functional need of all urban areas so cannot be eliminated. According to studies from previous earthquakes, when there is severe earthquake shaking, Reinforced Concrete (RC) frame buildings with open ground levels function badly. In this work, four models of G+14 RC frame buildings with and without a shear...
The beam-column joint is the crucial zone in a reinforced moment-resisting frame. In the present study, the performance of the beam-column joint region has been strengthened by incorporating novel reinforcement detailing. Tests are conducted for different specimens with extra cross-bars provided in addition to the conventional reinforcement detaili...
Citations
... Thus, most considerations are directed towards using all possible methods to find the ideal position of the outriggers in the high-rise structure to withstand the connected load. [8] "Optimum usage of outriggers in tall steel buildings" by Mousleh [9] demonstrates, having the outrigger at floor 24 (68% of the height from the base) obtains the most efficient and economical structural system. It is almost similar to the result provided by Zhou [8], where it was found that having an outrigger at 67% of the height from the base is the optimum choice. ...
Eliminating significant structural challenges from various tubular systems and growing architectural design flexibility has rendered the outrigger system one of the most prevalently used structural solutions for today's tall buildings. This study considers distinctive plan shapes and different outrigger numbers produced by parametric devices with respect to the architectural parameter and structural criteria. This research paper aims to demonstrate an innovative idea in the early stage of design to architects and designers who are mostly unfamiliar with structural and wind engineering. Besides, to manifest the belief that architectural geometry and the structural system can be considered simultaneously in the early stage of the tall-building design; consequently, this consideration can enhance the architectural decisions in the early stage of design. The objective of this study is to contemplate the impacts of the outrigger and the efficiency of each outrigger using one to six outriggers in the structure, which has placed on various plan shapes concerning one objective: total weight of the structural elements per unit area in respect of the maximum displacement. Ergo, 48 models placed on different plan shapes with fixed 240 m height are generated. The generated models are developed for 1, 2, 3, 4, 5, and 6 outriggers. To aimed that, Rhino programming and its plug-in Grasshopper are utilized for modeling, and Karamba3D (FEM) is utilized for structural examination. According to the weight of the structural per m² concerning maximum displacement in the eligible area of about 48 cm(H/500), in hexagon plan shape with two outriggers and circular plan shape with one outrigger, analyzes achieve more proper results.
... Even though outriggers are internal structures, the contribution to belt trusses and mega columns represents a large planner spread of the building stresses. Another advantage of an outrigger structure is that closely spaced columns are not needed which allows flexibility in meeting building functional requirements as presented in an article [17]. Previous studies demonstrate a possibility that designing the belt truss is not only to resist the lateral load but to mitigate possible disproportionate collapse caused by extreme events. ...
This paper presents the development of the outrigger structural system from the conventional outrigger to damped outrigger concepts. Outrigger structural system development from the conservative design as a rigid connection to a virtual connection with passive control, active control system, semi-active control system to hybrid control system is deliberated. Following brief overviews on history of outriggers, types of the outrigger, analysis of tall buildings without outriggers, formulation of equations for outrigger structure to simplify analysis are elaborated. Different approach to locate optimum positioning of outriggers in tall structure is elucidated. Analysis of outrigger to study its behavior in high-rise buildings using different methods is stated, and review on the damped outrigger system is explicated. This paper tries to highlight the advantages of outrigger structure with semi-active control and performance enhancement of the outrigger system with the effective devices, and enhanced results are also depicted. This review also paves a way for the new area of research in structural control with the incorporation of smart devices and smart technology.
... The influence of belt elements on the structure's behavior was not considered in this analysis. (Shehu, 2015) (Mousleh, 2017) studies the effects of the outrigger when inserted in different locations to determine the optimal position for a single outrigger. For a 3D building, Static and dynamic analyses were performed. ...
... This section focuses on the static analysis of one model (Model 18), as seen in (Figure 2-7), where the outrigger is located at the middle of the structure. Khaled Kasem (Mousleh, 2017) In the linear static analysis (Figure 2-8), the outrigger addition reduced 13% in seismic drift, a decrease of 25% in wind deflection, and a 15% reduction in the seismic overturning moment. (Mousleh, 2017) The result of the work by (Mousleh, 2017) is crucial to understanding how a dual structural system 3D building behaves with an outrigger system. ...
... Khaled Kasem (Mousleh, 2017) In the linear static analysis (Figure 2-8), the outrigger addition reduced 13% in seismic drift, a decrease of 25% in wind deflection, and a 15% reduction in the seismic overturning moment. (Mousleh, 2017) The result of the work by (Mousleh, 2017) is crucial to understanding how a dual structural system 3D building behaves with an outrigger system. Additionally, (Mousleh, 2017) found that the cost of the superstructure could be reduced by 25% when an outrigger system is added at (0.68H) from the building base. ...
Designers have been facing many challenges throughout the years in designing tall buildings. One of the challenges in tall buildings is lateral stability. Since the buildings are getting taller worldwide, the conventional structural systems are no longer efficient in resisting lateral loads. Therefore, many innovations were implemented into the structural systems of tall buildings. One of these innovations is the outrigger system which is commonly a rigid truss connecting the inner core of the structure to the exterior columns to increase the overall performance of the structural system against lateral actions. In this research, two types of elements: Steel plate shear wall (SPSW) and buckling restrained bracing (BRB), were considered outrigger elements. The current research studied the efficiency of using these elements under two types of analyses: elastic and plastic analysis. Furthermore, the outputs data are discussed and compared with existing literature. The main finding of this research is that the SPSW outrigger is at least two times more efficient than the BRB outrigger.
