Analysis and Design of RC Structure with Light Weight Bricks Using Etabs

A Building has to be defined is an enclosed structure intended for human occupancy. Constructions work has been seen in most of the countries developing with the increase of material cost in the construction work, there is a need to find more cost which can be affordable to people. In the manufacturing of brunt clay bricks, smoke evolved at a great extent and also toxic gases which can harm an environment. So, as to overcome with all these problems. From previous research observed that light weight bricks of Recycle paper mill residue (RPMR) and rice husk ash (RHA) which composes of Recycle paper mill residue (RPMR) and rice husk ash (RHA) and cement which are more economical and eco-friendly. The use of recycle factory residue and rice husk ash bricks are reduce load of wall on beams and columns makes it a relatively lighter members and reducing the hundreds (or) moments. This project includes analysis and design of multi-stored RC structure (G+3) with light weight bricks by using ETABS, comparison will be done with conventional bricks.


Introduction
Building construction is that the engineering deals with the development of building like residential houses. In a simple building are often define as an enclose space by walls with roof, food, cloth and therefore the basic needs of citizen. In the early past humans lived in caves, over trees or under trees, to guard themselves from wild animals, rain, sun, etc. as the times passed as humans being started living in huts made from timber branches. The shelters of these old are developed nowadays into beautiful houses. Rich people live in sophisticated condition houses. A homogeneous mixture of RPMR (Recycle paper mill residue) -RHA (rice husk ash)cement was prepared with varying proportions, each set comprising of varying percentage of RPMR, RHA and cement were prepared. Sample set A has 80% RPMR, 10% RHA and 10% of cement by weight, sample set B has 75% RPMR, 15% RHA and 10% cement by weight whereas sample set C has 70% RPMR, 20% RHA and 10% of cement by weight. Results suggests that the optimum mix, both in terms of the strength parameters and overall physico-chemical characteristics will be 80% RPMR, 10% RHA and 10% cement. In this project, attempt has to been done to replace the red bricks with light weight blocks. The use of light weight block significantly reduces the cost of construction. Compressive strength of RPMR-RHA-cement brick was increased and found to be more than 11MPa in all the three samples. All brick samples had excellent compressive strength (11-15 MPa) is nearly five times higher than the compressive strength of the conventional burnt clay brick. RHA and RPMR block is a load-bearing construction material that is of lower density(588kg/m3) than other construction materials due to its high porosity. Due to its lower density of these blocks, tall buildings constructed using these blocks have less need for steel and concrete for structural members. This project mainly deals with the comparative analysis of conventional bricks and light weight bricks, results which are obtained from the analysis of a multi storied building where analyzed by using ETABS software.  making the grids, begin to outline the fabric property bychoosing outline menu-material properties (define concrete and steel reinforcement). afterward outline section properties (beams, columns, slabs and wall) bygivingthe required details in shaping. Afterward we tend to outline section size bychoosingframe sections as shown below and supplementarythe desired section for beams, column etc.`   After defining the property for material and section properties, now draw the structural components using command menu > Draw line for beam and create column in degion for columns by which property assigning is completed for beams and columns sections. Assigning of supports. After drawing the details of building (beams, columns slabs, wall), now assign the supports by going to assign menu > joint menu > restraints > fixed.

LOAD CALCULATIONS:
The load calculation of the structure is calculated as follows;  Live Load :3kN/m2  Dead Load (floor finishes) :1.5kN/m2  Wall Loads (light weight bricks) • For 9" wall -0.23

DESIGN AND ANALYSIS
After the detailed analysis of structure, the following results are obtained which shows the area of steel required in respective structural members (beams, columns, shear walls). Along with the steel area, the bending moment details, shear force details and deflections in each beam is also obtained in a systematic manner. All these details are obtained in an auto generated file which is generated automatically by ETABS software while we work on the structure. Necessary snapshots are given in this chapter.
As beams, columns and slabs are designed in detailed manner in ETABS, the design of footing is done in Microsoft Excel Spreadsheets. Also manual calculations have been performed for Beams, slabs and columns and checked with software results.
After obtaining the detailed design reports and necessary AutoCAD plans, the 3D modelling of the structure is carried out in E-TABS for analysis and design. We have also done the Rebar Modelling which shows the reinforcement details structural members as per the design.

Frame Sections
The Frame sections that is columns and beams that are used in the structure are given with the material, shape and size used Slab Shell-Thin M25 120

Reinforcement Sizes
The following reinforcement sizes are used for the structures.

LOADS
The loading information is applied to the models as shown below.  Fig.15. SFD of conventional building

ANALYSIS RESULTS
Percentage of reduction in BM and SF in Corner Beam9 from figures 6.4 & 6.5:  From the analysis 6.15% of shear force is reduced in light weight bricks when compared to conventional bricks.
 Where as 11.690% of bending moment is reduced in beam.
Percentage of reduction in BM and SF in Corner Column1 from figures 6.8 & 6.9:  From the analysis 5.260% 0f shear force is reduced in light weight bricks when compared to conventional bricks.
 Where as 7.897% of bending moment is reduced in column.

Percentage of reduction in BM and SF in Intermediate
Beam14 from figures 6.6 & 6.7:  From the analysis 3.312% of shear force is reduced in light weight bricks when compared to conventional bricks  Where as 7.244% of bending moment is reduced in beam Percentage of reduction in BM and SF in Intermediate Column7 from figures 6.10 & 6.11:  From the analysis 17.43% 0f shear force is reduced in light weight bricks when compared to conventional bricks.
 Where as 17.21% of bending moment is reduced in column.

Concrete Frame Design
 Column details