Abstract :-
From olden days we know that earthquake is disaster causing event, to overcome land crisis in cities it is essential to make earthquake resistant multi storied buildings. Any structure, to be durable and reliable, should be designed to withstand gravity loads, earthquake loads and wind loads, and able to resist all kind of temperatures, also to assimilate vibrations and absorb noises. This brought more challenges for the engineers to cater both gravity loads as well as lateral loads. Construction of multi storied buildings is more complex without using any lateral force resisting system. Provision of lateral force resisting system makes the structure earthquake resistant. The main aim of this study is to analyze the behavior of commonly used lateral force resisting systems. Here lateral force resisting systems like Shear wall, steel bracing System, masonry infill, outrigger are applied to a 20 storey symmetrical RC building, analyzed as per IS 1893 (Part 1):2002 and performances are compared. On comparing the results obtained, shear wall shows the good resistance for earthquake load compared to the other systems which is consider for the analysis.
Introduction:-
Buildings are subjected to two types of loads
(i) vertical
loads
(ii) lateral load.
The structural system of the building
has to cater resistance for both the types of loads. It has been
established that the design of multi-storey building is
governed by lateral loads and it should be prime concern of
the designer to provide adequately safety of the structure
against lateral loads. The advances in civil engineering have
already found the key to deal with this problem. Various
types of resisting systems have been introduced which can
resists these forces. Lateral force resisting system absorbs
the lateral forces acting during the earthquake and increases
the stiffness of the structure. To make the structure
earthquake resistant, the provision of lateral force resisting
system is essential. During the earthquake, substantial
horizontal forces are acting on the structures and cause
severe damages to the structural elements leads to failure of
structure. To avoid the damages from horizontal forces like
seismic forces and wind forces, the provision of lateral force
resisting system in the structure is must. Lateral forces can
develop high stresses, produce sway movement or cause
vibration, which will lead structures fail. Therefore, it is very
important for the structure to have sufficient strength
against vertical loads together with adequate stiffness to
resist lateral loads. Hence the study on various types of
lateral force resisting system is very important to know
which type of system gives better performance under
seismic activity. In this study, the emphasis is given on
analysis of the structures having lateral force resisting
systems like shear wall, steel bracing, outrigger and masonry
infill.
1.1Reinforced Cement Concrete (RCC) Moment
Resisting Frame
In building frame system, horizontal members (beams)
with vertical members (columns) and joints of frame are
resisting the earthquake forces, primarily by flexure. This
system is generally preferred by architects because they are
relatively unobtrusive compared to the shear wall or braced
frames, but there may be poor economic risk unless special
damage control measures are taken. They derive the lateral
resistance from the rigidity of the connections.
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