Abstract
One of the advanced structural systems that have been applied in tall buildings to improve the building strength during quake loads is the outrigger system. Most of the previous researches interested to study the behavior of steel outrigger truss system, although the hard connection between the concrete and steel members may give us the inaccurate output. For that, This research aims to find the best structural concrete outrigger system by performing a comparison between two structural outrigger systems, the wall beam outrigger system, and the vierendeel outrigger system which makes the building facing strong actual earthquakes. All the models were analyzed in the advanced Midas-Gen software program and the building response was studied under El-Centro time history earthquake load. And also, finding the best outrigger position through the building height when the outrigger is applied in one and two stories. This comparison is built on different parameters as storey drift, storey drift ratio, and the base storey overturning moment. The results showed that a one-storey wall beam structural system is better than two stories vierendeel structural system when these systems are applied as an outrigger system. The best position for one storey outrigger is about 0.45 of the total building height and for the two stories outrigger, the 0.20 and 0.45 of the total building height are the best positions. Overall, the concrete outrigger systems are an effective structural system to make the tall buildings facing the earthquake loads.
Highlights
The development of structural systems to withstand unexpected earthquake loads is the basic important study in Egypt today
Figure [4b] shows that the storey drift ratio improved by percentages 33.87%, 33.8%, and 29.09% when providing two stories vierendeel outrigger structural system at (0.45&0.75H), (0.45H&0.2H), and (0.2H&0.75H), and Figure [4c] shows that the storey drift ratio improved by percentages 32%, 23%, and 20% when providing two stories vierendeel outrigger structural system one of them fixed at the roof and the other at 0.45H, 0.75H, and 0.2H
This research studied the adequacy of the outrigger system to increase building strength through earthquakes
Summary
The development of structural systems to withstand unexpected earthquake loads is the basic important study in Egypt today. Mohamed Husain, et al - The seismic response of structural outrigger systems in the tall buildings the quake loads effect This theory was built on a deep beam connected between the internal core and exterior columns to make the wall and columns worked together by generating a tension force in the facing earthquake columns and compression in the opposite columns. One storey and two stories outrigger truss system which connected between the central core and external columns had been used to improve the stiffness They changed the outrigger position through the height of all models. All models were analyzed in an ETAB program under wind loads and linear static and dynamic earthquake loads besides permanent loads according to the Indian standard code After the analysis, they concluded that the 1/3rd distance is the optimum position of one outrigger in the slender tall buildings. Istraživanja i projektovanja za privredu ISSN 1451-4117 Journal of Applied Engineering Science Vol 19, No 3, 2021
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