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Earthquake-resistant design of structures has grown into a truly multidisciplinary field of engineering wherein many innovative developments and trends are coming up. The nature of the structural system of high raised buildings is a critical influencing factor of the earthquake resisting capability of the structure. The tube in tube structural syst...
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Citations
... It has been observed that Shear wall system is more capable in withstanding transverse loads for buildings up to thirty stories and for buildings more than thirty story frame tube entity is more capable than shear wall entity in opposing transverse loads. Scaria and Karmakar, 2018) carried out the comparison of multiple sided structures with tube in tube system and conventional system which are subjected to traverse loads in different seismic zones. The modelling and analysis are performed for seismic zones (Zone II to V). ...
In the present world scenario, construction of tall building is being preferred
due to rapid increase in the cost of land, lack of land availability and also to
preserve land in rural areas for agricultural use (Smith and Coull 1991). The design
of tall buildings is primarily governed by wind and seismic loads (Chaudhary et.
al. 2019). The performance of the buildings depends on the structural configuration
and the present study aims at comparing the performance of tall building
with different configurations. In the present study, tall buildings have been investigated
under the effect of seismic loads with different structural, namely, (i) special
moment resisting frames, (ii) frame-shear wall buildings, (iii) outrigger systems,
(iv) braced model and (v) hybrid model. The building models are assumed to be
located in Guwahati, Assam which is one of the most earthquake-prone zones in
India.Adetailed analysis of the building system is done by modeling the geometry,
material section properties and boundary conditions. The sections are discretized
using FE mesh using software “ETABS 2016”. Appropriate finite elements are
assigned to beams and columns; slab is modeled as a rigid diaphragm to simulate
the dynamic behavior of tall building structures. Initially, a modal analysis
has been performed to get the natural frequency/period of the buildings. Further,
seismic analysis has been carried out to get the performance levels and other
responses. Firstly, pushover analysis is performed to obtain the collapse states
of the buildings. Then, time-history analyses are carried out to get the dynamic
behavior of the buildings. Five spectrum compatible ground motions compatible
to Indian design spectrum at maximum earthquake level are considered for the
time-history analysis. With the results obtained, a comparison is made for the
performances of different structural systems. A detailed procedure of analysis
of tall building systems has been discussed. The braced building has performed
better as compared to the rigid frame structure. However, the frame-shear wall
buildings give the best performance out of all building types. The outrigger and
hybrid stiffening buildings over-estimate the performance levels. The conclusions
drawn from this study are expected to be useful for academicians and structural
designers/practicing engineers.
In the modern world due to increase in population, there is decrease in availability of land, and this has created a huge demand for land in the urban areas. Therefore, it is not possible to move horizontally for construction because of land constraints, and this has paved a way for the vertical expansion of structures for the increasing demand of housing industry. Different types of techniques are used for the construction of high-rise structures. Keeping in view, a comparative study of outrigger and tube-in-tube structures for high-rise structures has been done. In this study, two 3-dimensional structures of 40 story each, one with outrigger structure and another with tube-in-tube structure are modeled, analyzed, and compared with each other in ETABS. Time history analysis is performed on both outrigger and tube-in-tube structures. The analysis is performed in seismic zone-iv. The parameters included in this study are story displacement, story drift, and base shear. On the basis of the analysis of results, it is concluded that the outrigger structure is more efficient and safer in earthquake zones for high-rise buildings.
In today’s world the population has been increasing day by day, mostly in case of urban areas and therefore availability of land has been gradually reducing which resulted in impact on the development of the structures. Hence there is immense demand of high-rise structures which has created a need for unconventional efficient structures. The need shows a potential solution to this problem which is increasing the height of the structures using different techniques like outrigger structures and tube in tube structures. The structural efficiency of high-rise structures heavily depends on the lateral stiffness and resistance capacity. The paper aims to review various researches done on outrigger and tube in tube structures. Performance of the structure under lateral loads like wind and earthquake loads as well as various parameters like story displacement, story drift and story shear are reviewed. The review will be helpful to researchers in the modelling of outrigger and tube in tube structures.
KeywordsHigh rise structuresOutrigger structuresTube in tube structuresLateral stiffnessStory displacement
