27-08-2014, 12:29 PM
A plan of Design of Admin Block GGI 3-multi storey reinforced concrete (RC) frame structure is considered for modeling and analysis using ETABS. Beam sizes: 300x450mm Story Height - 3.6 m Column Sizes: 300X450 mm Live Load -3 KN/m2 Slab thickness: 300 mm Dead load -1KN/m2 Concrete Grade:M25 Floor Finish load- 1KN/m2 Steel Fe415 Wind load -1KN/m2 Story : 3 story
The ETABS building is idealized as an assemblage of area, line and point objects. Those objects are used to represent wall, floor, column, beam, brace and link/spring physical members. The basic frame geometry is defined with reference to a simple three-dimensional grid system. With relatively simple modeling techniques, very complex framing situations may be considered.
The buildings may be unsymmetrical and non-rectangular in plan. Torsional behavior of the floors and interstory compatibility of the floors are accurately reflected in the results. The solution enforces complete three dimensional displacement compatibility, making it possible to capture tubular effects associated with the behavior of tall structures having relatively closely spaced columns.
Semi-rigid floor diaphragms may be modeled to capture the effects of in plane floor deformations. Floor objects may span between adjacent levels to create sloped floors (ramps), which can be useful for modeling parking garage structures.
Modeling of partial diaphragms, such as in mezzanines, setbacks, atriums and floor openings, is possible without the use of artificial (“dummy”) floors and column lines. It is also possible to model situations with multiple independent diaphragms at each level, allowing the modeling of buildings consisting of several towers rising from a common base.
The column, beam and brace elements may be non-prismatic, and they may have partial fixity at their end connections. They also may have uniform, partial uniform and trapezoidal load patterns, and they may have temperature loads. The effects of the finite dimensions of the beams and columns on the stiffness of a frame system are included using end offsets that can be automatically calculated.
The floors and walls can be modeled as membrane elements with in plane stiffness only, plate bending elements with out-of-plane stiffness only or full shell-type elements, which combine both in-plane and out-of plane stiffness. Floor and wall objects may have uniform load patterns in-plane or out-of-plane, and they may have temperature loads. The column, beam, brace, floor and wall objects are all compatible with one another.
Analysis Features
Static analyses for user specified vertical and lateral floor or story loads are possible. If floor elements with plate bending capability are modeled, vertical uniform loads on the floor are transferred to the beams and columns through bending of the floor elements. Otherwise, vertical uniform loads on the floor are automatically converted to span loads on adjoining beams, or point loads on adjacent columns, thereby automating the tedious stask of transferring floor tributary loads to the floor beams without explicit modeling of the secondary framing.
The program can automatically generate lateral wind and seismic load patterns to meet the requirements of various building codes. Three dimensional mode shapes and frequencies, modal participation factors, direction factors and participating mass percentages are evaluated using eigenvector or ritz-vector analysis. P-Delta effects may be included with static or dynamic analysis.
Response spectrum analysis, linear time history analysis, nonlinear time history analysis, and static nonlinear (pushover) analysis are all possible.
Ø The static nonlinear capabilities also allow you to perform incremental construction analysis so that forces that arise as a result of the construction sequence are included.
Ø Results from the various static load conditions may be combined with each other or with the results from the dynamic response spectrum or time history analyses.
A plan of Design of Admin Block GGI 3-multi storey reinforced concrete (RC) frame structure is considered for modeling and analysis using ETABS.
Beam sizes: 300x450mm Story Height - 3.6 m
Column Sizes: 300X450 mm Live Load -3 KN/m2
Slab thickness: 300 mm Dead load -1KN/m2
Concrete Grade:M25 Floor Finish load- 1KN/m2
Steel Fe415 Wind load -1KN/m2
Story : 3 story