BRGS.xlsx
5
DESIGN OF ELASTOMERIC BEARINGS FOR SOLID SLAB DECKINGS Total number of bearings in normal spans at each end = 6 ( 1 ) Design Load on bearings: TYPE MAXIMUM REACTION ON ONE BEARING(t) Dead load Class 70R(wheeled) +SIDL +Class A 1Lane NORMAL 10.0 28.6 29.1 TYPE MINIMUM REACTION ON ONE BEARING(t) Dead load Class 70R(wheeled) +SIDL +Class A 1Lane NORMAL 10.0 19.6 -3.2 Design Vertical Load on bearing: TYPE DESIGN VERTICAL LOAD (t) MAXIMUM LOAD MINIMUM LOAD NORMAL 10.0 57.70 16.40 ( 2 ) Design Longitudinal Translation: Considering the effect of creep , shrinkage & temperature the value of strain has been taken @ 5x10-4 as per Clause 916.3.4 of IRC:83 Part II TYPE LONGITUDINAL TRANSLATION (mm) NORMAL 10.0 2.50 SPAN LENGTH (m) SPAN LENGTH (m) SPAN LENGTH (m) SPAN LENGTH (m)
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Transcript of BRGS.xlsx
DESIGN OF ELASTOMERIC BEARINGS FOR SOLID SLAB DECKINGS
Total number of bearings in normal spans at each end = 6
( 1 ) Design Load on bearings:
TYPE
MAXIMUM REACTION ON ONE BEARING(t)
Dead load Class 70R(wheeled)
+SIDL +Class A 1Lane
NORMAL
10.0 28.6 29.1
TYPE
MINIMUM REACTION ON ONE BEARING(t)
Dead load Class 70R(wheeled)
+SIDL +Class A 1Lane
NORMAL
10.0 19.6 -3.2
Design Vertical Load on bearing:
TYPE
DESIGN VERTICAL LOAD (t)
MAXIMUM LOAD MINIMUM LOAD
NORMAL
10.0 57.70 16.40
( 2 ) Design Longitudinal Translation:
Considering the effect of creep , shrinkage & temperature the value of strain has been taken @ 5x10-4 as per Clause 916.3.4 of IRC:83 Part II
TYPE
NORMAL
10.0 2.50
SPAN LENGTH (m)
SPAN LENGTH (m)
SPAN LENGTH (m)
SPAN LENGTH (m)
LONGITUDINAL TRANSLATION (mm)
( 3 ) Design value of Rotation:
TYPE
ROTATION DUE TO
DEAD LOAD
NORMAL
10.0 0.001200 0.000820 0.002020
( 4 ) Design Horizontal Force Per Bearing:
TYPE
DESIGN HOR.
FORCE PER
BEARING (t)
NORMAL
10.0 10.1 1.68
SPAN LENGTH (m)
TOTAL VALUE OF ROTATION (radians)LIVE
LOAD
SPAN LENGTH (m)
MAXIMUM HORIZONTAL FORCE CLASS 70R(wheeled) + CLASS A (1
Lane)
DESIGN OF ELASTOMERIC BEARING (units in N,mm) FOR SOLID SLAB DECKING: SPAN 10.0.M-------------------------------------------------------------------------------------------------------------------------------------------BEARING DIMENSIONS & PROPERTIES:
G Shear modulus 1 MPa
Overall breadth 220 mm
Overall length 320 mm
Thickness of each layer 8 mmn Number of layers 4 -------------------------------------------------------------------------------------------------------------------------------------------RESULTS :
= side elastomer cover 6 mm
4 mm
3 mm
h 40 mm
55 mm
R 1 <=2
b 208 mm
l 308 mm
A = b*l 64064
S 7.76 6-12-------------------------------------------------------------------------------------------------------------------------------------------FORCES & DEFORMATIONS MAX LL MIN LLON BEARING :P Load 577000 164000 N
Horizl. force along b 16833 16833 N
along l 0 0 N
Translation along b 2.50 2.50 mm
along l 0.00 0.00 mm
Rotation along b 0.00202 0.00202 radian
along l 0.00000 0.00000 radian-------------------------------------------------------------------------------------------------------------------------------------------RESULTS :
= P/A 9.01 2.56 2-10 MPa
0.3253 0.3253
0.0000 0.0000
0.3253 0.3253 <=0.7
0.7000 0.4560
0.00202 0.00202 radian
0.01151 0.00327 radian
1.741 0.495 MPa
0.3253 0.3253 MPa
0.00288 0.00082 radian
0.00194 0.00055 radian
2.4120 2.4120 MPa
t 4.4783 3.2321 <=5 MPa-------------------------------------------------------------------------------------------------------------------------------------------
0.32 t--------------------------------------------------------------------------------------------------------------------------------------------
bo
lo
hi
hc
he = hi/2
hs = 3/4/6 FOR hi<=8,10/12/16
= n*hi+2*he bo/10 - bo/5
ho = h+(n+1)*hs
= lo/bo
= bo-2*hc
= lo-2*hc
mm2
= A/(2*(b+l)*hi)
Hb
Hl
Dbd
Dld
abd
ald
sm
gdb = Hb/A+Dbd/h
gdl = Hl/A+Dld/h
gd = sqrt(gdb2+gdl
2)
gd,all = 0.1*sm+0.2, but<=0.7 >=gd
ad = (abd*b+ald*l)/b
aall = 0.5*n*sm*hi/(b*S*S) >=ad
tc = 1.5*sm/S
tg =gd
abi = 0.5*sm*hi/(b*S2)
ali = 0.5*sm*hi/(l*S2)
ta =0.5*(b2*abi+l2*ali)/hi2
= tc+tg+ta
Shear Rating=(lo*bo*G*Dbd/ho)*10-4
DESIGN OF ELASTOMERIC BEARING (units in N,mm) FOR SOLID SLAB DECKING: SPAN 10.0.M-------------------------------------------------------------------------------------------------------------------------------------------
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