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Calculation of a structure as a frame
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Reference Calculation OutputFrame Analysis
To check the effect from vertical and lateral loads, frame analysis was
done using the computer package "ETAB". When considering the whole
building, frames in "Y" direction are the critical frames. Hence a full frame
analysis done for frame 7(A-K) is detailed here.
To consider alternate span loading and lateral load effects in "Y"
direction, eight static load cases were selected. Another two static
load cases were selected to represent the loading in "X" direction.
To reprent alternate span loading in "Y" direction, two static load
cases for Dead loads as Dead 1 (D1) and Dead2 (D2); and two static
load cases for Live loads as Live 1 (L1) and Live 2 (L2); were selected.
Wind 1(W1) static case was taken for Wind flows from front side of
building and Wind 2 static case was taken for the wind flows from rear
side of building. Static load cases " N1" and "N2" was taken to consider
notinal horizontal loads to the building. When notional load is critical than
BS 8110 factored wind force, unfactored notional loads were taken instead to
Cl. 3.1.4.2 Wind force, as per Cl. 3.1.4.2 of BS 8110
To get the axial force which exerted from the "X" direction of the frame,
two static cases called, Dead 3 (D3) and Live 3 (L3) were taken to
consideration.
Static Load Cases:
Dead
Dead 1 (D1) To represent the alternate span loading
Dead 2 (D2) in "Y" direction.
Dead3 (D3) - To represent the loading exerted from
"X " direction.
Live
Live 1 (L1) To represent the alternate span loading
Live2 (L2) in "Y" direction.
Live 3 (L3) - To represent the loading exerted from
"X " direction.
Wind 1 (W1) To represent the wind loading in front
Wind 2 (W2) and rear in "Y" direction.
Notinal Loads (N1) To represent the notinal loading
Notinal Loads (N2) in front and rear in "Y" direction.
From above static load cases, following seven load combinations were taken to consideration.
Project : Dahampaya Feature Frame Analysis
DESIGN UNIT Designed Date
EPC DIVISION Date
Lateral loads
DEC
Checked
Reference Calculation Output CENTRAL ENGINEERING CONSULTANCY BUREAU Job Code D-676 Page 01 of 08
Load safety factors in Combinations:
Static load case in "Y" direction
Dead load Live load Wind load Dead Live
D1 D2 L1 L2 W1 W2 N1 N2 D3 L3BS 8110 1 1.4 1.4 1.6 1.6 - - - - 1.4 1.6T-2.1
2 1.4 1.0 1.6 - - - - - 1.4 1.6
3 1.0 1.4 - 1.6 - - - - 1.4 1.6
4 1.0 1.0 - - 1.4 - 1.0 - 1.0 -
5 1.0 1.0 - - - 1.4 - 1.0 1.0 -
6 1.2 1.2 1.2 1.2 1.2 - 1.0 - 1.2 1.2
7 1.2 1.2 1.2 1.2 - 1.2 - 1.0 1.2 1.2
Calculation of Dead loads and Imposed loads:
Design loads for supporting beams were calculated by using shear co-efficients of two way spaning slabs.
Specimen calculation for frame on grid 7 (A-K) at First floor level:
For Span K-J:
Dead Load
Load from slab = 10.9kN/m(0.4x4x3.6)+(0.36x4x3.6)
Load from beam = 2.7 kN/m(0.3x0.375x24)
No wall load is present at this span
Load from finishes = 3.0 kN/m(0.4x4x1)+(0.36x4x1)Total dead load = 16.6 kN/m
Project : Dahampaya Feature Frame Analysis
DEC
Load Combinatio
ns
Static load case in "X"Notional
load
Reference Calculation Output DESIGN UNIT Designed Date
EPC DIVISION Date
CENTRAL ENGINEERING CONSULTANCY BUREAU Job Code D-676 Page 02 of 08
Imposed load
Imposed load for general office area = 3.5 kN/m2
Imposed load for span K-J = 10.6kN/m(0.4x4x3.5)+ (0.36x4x3.5)
Simillary for other spans and other floors dead loads and imposed loadswere calculated. Specimen calculations for beam 7(K-A) of Ground floor
Wind loads were also calculated for frame on grid 7(A-K) according to the CP-3 Chapter V to evaluate horizontal loads.
DEC
Checked
and First floor are attached here with in Figure 4-1 and Figure 4-2..
Reference Calculation Output
Project : Dahampaya Feature Frame Analysis
DESIGN UNIT Designed Date
EPC DIVISION Date
CENTRAL ENGINEERING CONSULTANCY BUREAU Job Code D-676 Page 03 of 08
DEC
Checked
Reference Calculation Output
Reference Calculation Outputs
Project Feature DESIGN UNIT Designed Date
DEC
EPC DIVISION Checked Date CENTRAL ENGINEERING CONSULTANCY BUREAU (CECB) Job Code Page of
DEC