BridgePy
AS 5100.4 Stiffness
DPWH Method B
DPWH Method A
DPWH Isolation
HDR-P Design
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Stiffness Calculator
AS 5100.4-2017
Material Properties
G - Elastomer Shear Modulus (MPa)
B - Elastomer Bulk Modulus (MPa)
Bearing Dimensions
a - Parallel to span (mm)
b - Perpendicular to span (mm)
Layer Configuration
External layers (count)
External thickness (mm)
Internal layers (count)
Internal thickness (mm)
Steel plate thickness (mm)
Calculate Stiffness
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Method B
DPWH / AASHTO LRFD - Art. 19.5.1
Geometry & Material
L - Length // longitudinal (mm)
W - Width // transverse (mm)
G - Shear Modulus (MPa)
Ls - Span Length (m)
hri - Internal layer (mm)
hrc - Cover layer (mm)
nri - Internal layers
hs - Steel thickness (mm)
Loading
RS1 - Design Reaction (kN)
VS1 Coefficient
DL Reaction (kN)
LL Reaction (kN)
Other Parameters
α
T
- Thermal exp. coeff.
ΔT - Temp. change (°C)
θ
s
- Service rotation (rad)
a
cr
- Creep factor
Fy - Steel yield strength (MPa)
Calculate Method B
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Method A
DPWH / AASHTO LRFD - Art. 19.5.4
Project Information
Project Name
Location
Designer
Geometry & Material
L - Length // longitudinal (mm)
W - Width // transverse (mm)
G - Shear Modulus (MPa)
Ls - Span Length (m)
hri - Internal layer (mm)
hrc - Cover layer (mm)
nri - Internal layers
hs - Steel thickness (mm)
Loading
RS1 - Design Reaction (kN)
DL Reaction (kN)
LL Reaction (kN)
Other Parameters
α
T
- Thermal exp. coeff.
ΔT - Temp. change (°C)
θ
s
- Service rotation (rad)
a
cr
- Creep factor
Fy - Steel yield strength (MPa)
Calculate Method A
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DPWH Isolation
Seismic Isolation Design Manual (2019)
Seismic Parameters (Sec. 5.4)
k
h0
- Horiz. seismic coeff.
γ
v
- Multiplier (Table 5.4.1)
f
pga
- PGA factor
H
b
- Horiz. seismic force (kN)
Z
g
- Vert. dist. to CG (m)
No. of bearings in line
Loading (kN)
R
D
- Dead Load Reaction
R
LL
- Live Load Reaction
Bearing Geometry (Sec. 6.2)
Shape
Rectangular
Circular
a - Length (mm)
b - Width (mm)
t
e
- Layer thickness (mm)
N - Number of layers
t
s
- Steel plate (mm)
G
e
- Shear Modulus (N/mm²)
Bearing Type (Table 6.2.1)
Laminated RB (α=35)
Lead Plug LRB (α=45)
HDR (α=45)
Deformation (mm)
Normal deformation
EQ deformation
Design EQ displacement
Bevel angle (rad)
Allowable Values (Table 5.7.2)
σ
ca
- Compressive (N/mm²)
σ
amp,a
- Amplitude
γ
n,allow
- Normal (%)
γ
eq,allow
- Seismic (%)
σ
ta
- Tensile EQ (N/mm²)
σ
sa
- Steel allow (N/mm²)
Breaking elongation (%, Table 5.7.1)
Calculate DPWH Isolation
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HDR-P Design
High Damping Rubber Bearing (Japanese BSDS)
Loading (kN)
R
D
- Dead Load Reaction
R
LL
- Live Load Reaction
R
L,max
- Max Downward (EQ)
R
U,min
- Min Upward (EQ)
Bearing Geometry
Shape
Rectangular
Circular
a - Length (mm)
b - Width (mm)
t
e
- Layer thickness (mm)
N - Number of layers
t
s
- Steel plate (mm)
G
e
- Shear Modulus (N/mm²)
RB Type
1 - Laminated RB (α=35)
2 - Lead Plug LRB (α=45)
3 - HDR (α=45)
Deformation (mm)
Normal deformation
EQ deformation
Design EQ displacement
Bevel angle (rad)
HDR Properties
HDR Type
HDR
HDR-S
Grade
G8
G10
G12
Thermal Movement
α
T
- Thermal coeff. (1/°C)
Span Length (m)
T
max
(°C)
T
min
(°C)
Allowable Values
σ
comp
allow (N/mm²)
σ
amp
allow (N/mm²)
σ
steel
allow (N/mm²)
σ
tensile
allow (N/mm²)
γ
normal
allow (%)
γ
seismic
allow (%)
Breaking elongation (%)
Safety factor
f
cr
- Buckling SF
f
c
- Steel plate coeff.
Calculate HDR-P
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