Project 2_Design & Analysis of a Hostel building at Guwahati, Assam

ANSWER:-

AIM:- To design and analysis of G+3 Hostel Building in ETABS and Foundation in CSI SAFE.

INTRODUCTION:-

• The procedure for analysis and design of a given building will depend on the type of building,its complexity,the number of stories,etc.
• First the architectural drawings of the building are studied,structural sysytems finalized sizes of structural members are decided and brought to the knowledge of the concerned architect.
• The procedure for structural design will involve some steps which will depend on the type of buiding and also its complexity and the time available for structural design.
• Often,the work is required to start soon,so the steps in designers to be arranged in such a way the foundation drawings can be taken up in hand within a reasonable period of time.
• Furthur,before starting the structural design ,the following information of data are required.

(1) A set of architectural drawings;

(2) Soil investigation report(SIR);

(3) Location of the place or city in order to decide on wind and seismic loadings;

(4) Data for lifts,water tank capacities on top ,special roof features or loadings.

PROCEDURE:-

step(1):-

• First we have to open the ETABS software.
• Next click on the file option at the left side top corner and select the new model,as shown below.

• After selecting the new model the new tab opens,in that tab we have to slect 'USE BUILT-In SETTINGs' option,as shown below.

• After setting the model intialization the templates tab will opens and select the grid only and press OK.
• Next we need to do the settings in grid system data,as shown below.

• Next we need to add the stories upto 3 story in the Data,as shown below.

step(2):-

• Next the plan views are visible in the ETAbs screen ,as shown below.
• Next we need to open the 3d-view,as shown in the below figure.

step(3):-

• Next we need to open define option and select material properties ,as shown below.

• After selecting the material properties the new tab appears ,then we add new materials by selecting the add new material option,as shown below.

step(4):-

• Now we need to add material type as concrete and grade as M25.
• Next we need to check the material property data,as shown below.

• Now we need to add new material type as rebar and grade as HYSD Grade 500.
• Next we to check the material property data ,as shown below.

• Now we need to add new material type as rebar and grade as HYSD grade 415.
• Next we need to check the material property data,as shown below.

• Hence the materials are assigned ,as shown below.

step(5):-

• Now we need to select the section properties and click on the frame sections,as shown below.

• After selecting the frame sections the new tab will be visible,in that we need to selct the add new property,as shwon below.

• After selecting the Add new property, the new tab appears.
• In that new tab we select the rectangular shape type in concrete,as shown below.

• Next the frame section property data will be vissble ,in that we add beams size as B450x650,as shown belwo.
• Next we bneed to select the modify/show rebar option as shown belwo.
• After selecting the modify/show rebar option the new tab appears ,in that we selct the design type as M3 design only(BEAM).
• Next we select the design longitudinal bars with grade of HYSD500.
• Next we skect confinement bars with thr grade of HYSD415.

step(6):-

• Next we have to add the column size as 450x650mm in the frame section property data,as shown below.

• Again we have to add the another column size as 650x450mm in the frmae section property data,as shown below.

step(7):-

• Next we select the slab section option from the section properties,as shown below.

• Next the slab properties tab will be visible ,i that we select the modify/show property option,as shown below.

• After selecting the modify/show property option,the new tab appears.
• In that we need to put the slab name as slab 125,it means slab with the thickness of 125mm.
• And we take the concret grade as M25,as shown below.
• Next we have to click the ok option.

• NOw we take the slab thickness separately for staircase with the thickness of 200mm,as shown below.

• Hence the slab properties are assigned ,as shown below.

step(8):-

• Next we need to add the columns using the quick draw columns option,as shown below.

step(9):-

• Next we need to add the beams using the quick darw beams option,as shown below.

step(10):-

• Next we need to add the slabs using the Quick draw floor/wall option,as shown below.

step(11):-

• Now we go to the bas eplan and select all base joints.
• Next we select the restrains from the joint option,as shown below.

• Now we need to selct the fixed joint and click on apply and then click on close button,as shown below.

step(12):-

• Next we need to selct the load patterns from the define option,as shown below.

• Now we should add Dead load ,live load ,Brick wall load,and earthquake load ,as shown below.

• Next we need to seloect eqx and click on the modify lateral load,then the new tab appears.,
• In this tab select X Dire and as per the IS1893:2002, the seismic zone factor for Guwahati,assam is taken as 0.36,as mentioned in the below table.
• And we need to select site type as 3,as shown below.
• Next click on the ok button.
• similarly,do this for all the seismic loads such as eqx+,eqx-,eqy,eqy+,eqy-

step(13):-

• Now we slect the object type option,as shown below.

• After selecting the object type option,the new tab will be visible,in that select the floors and click on the select button and close.

• Next we have to click on the assign option and then select shell loads from the shell loads we select the uniform option,as shown below.

• Here we need to consider the live load upto the 3rd floor with 2KN/m2 ,as shown below.

step(14):-

• Next we select the object type option,as shown below.

• After selecting the object type option,the new tab will be visible,in that select the beams and click on the select button and close.

• Next we have to click on the assign option and then select frame loads from the frame loads we select the distributed option,as shown below.

• Then after the new tab will appears ,in that we select load pattern as brickwall and take the uniform load as 3.5KN/m. and then click on the apply button and close.

• Now we click on the toogle option to view the loads acting on the strory,as shown in the below figure.

step(15):-

• Next from the define option we select the mass source,as shown below.

• In the mass source tab ,we select modify/show mass source option.
• Next we add the load patterns in the mass source Data,as shown below.

step(16):-

• Next from the define option we select the load combinations,as shown below.

• After selecting the load combinations the new tab is visible ,in that we select 'Add Default Design Combos' option.
• Next we select concrete frame design in the add defualt design combinations,as shown below.

• Now we can see her that the load combinations are visible,as shown below.

step(17):-

• From the selct option we select objec type option ,as shown below.

• After selecing the object type option,the new tab will be visible,in that select the floors and click on the select button and close.
• Next we have to selct the Diaphrams from the shell option,as shown below.

• After selecting the diaphrams the new tab will apperars,in that select D1 and click on the apply button and close.

• Hence the diaphrams are assigned ,as shown below.

step(18):-

• Next we have to check the model by clicking the check the model option ,as shown below.

• Next the check model tab will appears,in that select the all options and click on the ok button.

• After the model is checked ,then the warning tab will be visible and it tells that there is nom warning messages,as shown below.

step(19):-

• Now we have to do the run analysis,as shown below.

step(20):-

• After run analysis we selct the 'show deformed shape' option,then the new tab appears.
• In the deformed shape tab,we select Earthquake load in the load case.
• Next we see the deformed shape of the structure with the Earthquake loads.
• Similarly,we have to do this for all the remaining loads.

step(21):-

• Next we have to start the Beam design and column design by selecting the 'Start Design/Check' option,as shown below.

step(22):-

• After cpmletion of the beam design and column design,we need to select the 'Display Design Info' option,as shown below.

• After selecting the 'Display Design Info' option the new tab appears ,in that we select the longitudinal reinfircement in ths design output and click on the OK button,as shown below.

• Next the loangitudinal reinforcement details will appears,as shown below.

• Next we draw the reinforcement diagram of 7 span continous beam along Grid-1 ,and also need to provide the reinforcement details.
• The maximum Ast for the bottom support is 637mm2 and bottom middle is 637mm2.
• The maximum Ast for thr top support is 1038mm2 and top middle is 637mm2.
• Now we provide 6-12mm dia. at the top and bottom ,as shown below.
• Next we provide 3-16mm dia. at the top supports for the continous beam,as shown below.

step(23):-

• Now ,here we can see that the details of column reinforcement ,as shown below.

• Here we take column-1L for reinforcment ,now take the column size as 650x450mm.
• The maximum Ast for the column-1L is 4632mm3.
• Now we provide 16 bars with 16mm dia. as shown below.
• And we provide size of the stirup as 10mm,for Zone A we provide 100mm spacing and for Zone C we provide 150mm spacing ,as shown in the below figure.
• And the details of shear reinforcement are provided as per special cinfining reinforcement provision of clause 8.1 of IS 13920-2016.

step(24):-

• Next we have to export the base floor loads and loads from above to the SAFE 2016,as shown below.

step(25):-

• Next we open the SAFE 2016 and import the F2K file,a shown below.

• THen the F2K file has been opened in SAFE 2016,as shown below.

step(26):-

• Next we select the show loads from the dispaly option,as shown below.

• After selecting the show loads option,the new tab will be visible ,in that we select Dead_ABOVE as pattern,as shown below.

• Next we selelct Live_ABOVE as load pattern,as shown below.

step(27):-

• Next we select the materials from the define option to assign the materials,as shown below.

• After selecting the material the new tab appears,then we add new materials by selecting the Add new material option,as shown below.
• Now we need to add material type as concrete and grade as M25.
• Next we enter weight per unit volume as 25KN/m3.
• Next we enter modulus of elasticity as 25000N/mm2,as shown below.

• Now we need to add material type as rebar and grade as Fe500.
• Next we enter weight per unit volume as 77 KN/m3.
• Next we enter modulus of elasticity as 200000N/mm2,as shown below.

• Add material type as rebar and grade as Fe415.
• Next we enter weight per unit volume as 77KN/m3.
• Next we enter modulus of elasticity as 200000N/mm2,as shown below.

• Hence the materials are assigned ,as shown below.

step(28):-

• Now we need to select the slab properties from the define option,as shown below.

• After selecting the slab properties the new tab will be visible,in that we need to select the add new property ,as shown below.
• After selecting the Add new property option,the new tab appears.
• In that we need to put the property name as pile_cap.
• And we put the slab material as M25,as shown below.
• Thickness will be taken as 800mm.
• Next we have to click the ok option.

• Next again we need to add another slab property.
• We need to put the property name as pile_500,as shown below.
• Next we put the slab material as M25,as shown below.
• Next we have to click the ok option.

• Again we need to add another slab property.
• we need to put the propertyname as COLUMN STIF ,as shown below.
• Next we put the slab material as M25 ,as shown below.
• Thickness will be taken as 800mm.
• Next we have to click the ok option.

• Hence the slab properties are assigned ,as shown below.

step(29):-

• The pile caps are assigned ,as shown below.
• The piles are assigned with 500mm diameter.
• The column is assigned with the sizes of (450mmx650mm) and (650mmx450mm).

step(30):-

• Next we need to assign the soil properties.
• Now we select the soil properties from the support data,as shown below.

• After selecting the soil properties the new tab appears,in that we select the SOIL 150 and press OK.

step(31):-

• Now we select the points to asign the springs for the piles.
• Next we select the point springs from the support Data from assign option.

• Next the point spring properties tab will be visible,as shown below.
• Next we select the modify/show property,then the new tab appears ,in that we take 490.87 KN/mm in translation(compression only).
• spring constant=EA/L.

E=5000xroot 25 =25000,

A=pi/4xd2=196349054,

L=10000mm,

Therefore SPRING CONSTANT=490.87KN/mm.

• Hence the point springs are assigned successfully,as shown below.

step(32):-

• Next we have to assign the point load for the column.
• Now we select the point loads from the load Data from Assign option,as shown below.

• Next the point load tab will be visible ,in that we add the gravity load at Z-direction as 1071.53KN,as shown below.
• Next we enter the size for punching shear as 650x450mm,as shown below.
• Hence the point loads are assigned to the column,as shown below.

step(33):-

• Next we right click on the pile cap ,the new tab appears.
• In that we need to check the rebar material wether the Fe500 is assigned or not,if not we change to Fe500,as shown below.
• Similarly ,we neeed to check all the pile caps.

step(34):-

• Now we have to do the run analysis,as shown below.
• Then the deformed shape will be visible after completion of the run analysis.

step(35):-

• Next,from the display option we select the show reaction forces.

• After selecting the reaction forces option the new tab will be visible ,in that we put the load cases as DEAD.
• Next,clcik on the apply Button,as shown below.

step(36):-

• Next ,from the display option we select the show punching shear design ,as shown below.

• Now the punching shear values will be visible,the values are less than 1,as shown below.
• Then there is no errors in punching shear.
• If the punching shear values are more than 1,we need to increase the pile cap size.

step(37):-

• Next ,from the display option we select the show slab design,as shown below.

• After selecting the 'show slab design'option the new tab will be visible ,then clcik on the apply button,as shown below.

• Now here we see that the slab strip design results,according to the slab strip design result we can provide the reinforcement at the top and bottom.

RESULT:-

• The G+3 Hostel building has been Designed & Analyzed in ETABS 2018.
• And the Foundatins are designed and analyzed in SAFE 2016.