DESIGN OF ELASTOMERIC BEARINGS FOR SOLID SLAB DECKINGS

DESIGN OF ELASTOMERIC BEARINGS FOR SOLID SLAB DECKINGS Total number of bearings in normal spans at each end = (1)

6

Design Load on bearings:

SPAN LENGTH (m)

MAXIMUM REACTION ON ONE BEARING(t) Class 70R(wheeled)

+SIDL

+Class A 1Lane

10.0

28.6

29.1

TYPE

SPAN LENGTH (m)

Dead load

Class 70R(wheeled)

+SIDL

+Class A 1Lane

10.0

19.6

-3.2

NORMAL

Dead load

NORMAL

TYPE

MINIMUM REACTION ON ONE BEARING(t)

Design Vertical Load on bearing:

SPAN LENGTH (m)

MAXIMUM LOAD

MINIMUM LOAD

NORMAL

10.0

57.70

16.40

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

SPAN LENGTH (m)

LONGITUDINAL TRANSLATION (mm)

NORMAL

(2)

DESIGN VERTICAL LOAD (t)

TYPE

10.0

2.50

(3)

Design value of Rotation:

NORMAL

TYPE

DEAD LOAD

LIVE LOAD

10.0

0.001200

0.000820

TOTAL VALUE OF ROTATION (radians)

0.002020

Design Horizontal Force Per Bearing:

TYPE

NORMAL

(4)

ROTATION DUE TO

SPAN LENGTH (m)

SPAN LENGTH (m)

MAXIMUM HORIZONTAL FORCE CLASS 70R(wheeled) + CLASS A (1 Lane)

DESIGN HOR.

10.0

10.1

1.68

FORCE PER BEARING (t)

DESIGN OF ELASTOMERIC BEARING (units in N,mm) FOR SOLID SLAB DECKING: SPAN 10.0.M ------------------------------------------------------------------------------------------------------------------------------------------BEARING DIMENSIONS & PROPERTIES: G Shear modulus 1 MPa bo Overall breadth 220 mm lo Overall length 320 mm hi Thickness of each layer 8 mm n Number of layers 4 ------------------------------------------------------------------------------------------------------------------------------------------RESULTS : hc = side elastomer cover 6 mm he = hi/2 4 mm hs = 3/4/6 FOR hi