CANDE 2007

84 Pages·2009·1.93 MB·English

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E Introduction to the Capabilities of
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CANDE-2007
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Input and Design Features
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LI Tim McGrath
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www.sgh.com
CANDE 2007 – Design By AASHTO
• ASD (Called service in the Tutorial)
– analysis for service loads
– computes factors of safety for comparison with target values
• LRFD
– AASHTO LRRFD Bridge Design Specifications, 4th Ed
– Input load and resistance factors
– Analysis for factored loads
– Compares factored load to factored capacity
5 August 2009 CANDE 2007 Capabilities 2
AAHSTO LRFD
• Load Modifiers – Section 1
– ductility, redundance, importance
– culverts – live load redundant, earth load is not
• Load Factors – Section 3
– Earth, live, water
• Resistance Factors – Section 12
– Vary by material and limit state
5 August 2009 CANDE 2007 Capabilities 3
Corrugated Metal Design Criteria
Design Criterion Demand Capacity
(Strength limits)
Thrust stress (psi) σ = N /A f = yieldstrength
max max y
Global Buckling (psi) σ = N /A f = buckling capacity
max max b
Seam strength (psi) σ = N /A f = seamstrength
max max s
Plastic Penetration % pp = computed%plastic failure = 100%

(Performance Limits)
Allowable deflection % Δ = computeddeflect % Allowable = 5%
max
(Long Spans = 2%)

5 August 2009 CANDE 2007 Capabilities 4
Concrete Design Criteria
Design Criterion Demand Capacity
(Strength limits)
Steel yielding (psi) f = maxsteelstress f = yield strength
max y
Concrete crushing (psi) σ = maxcompression f′= compressivestrength
max c
Shear failure (lb/in) V = max shear force V = concreteshearcapacity
max ult
Radial tension failure (psi) t = max radial stress t = ultimateradialstrength
max ult

(Performance Limits)
Allowable crack (in) CW = maxcrack width CW = allowableCW(0.01inch)
max Allow

5 August 2009 CANDE 2007 Capabilities 5
Thermoplastic Design Criteria
Design Criterion Demand Capacity
(Strength limits)
Thrust stress (psi) σ = N /A f = ultimatestrength
max max u
Global Buckling (psi) σ = N /A f = buckling capacity
max max b
Combined strain (in/in) ε = bending + thrust ε = ultimatestrain
max ult

(Performance Limits)
Allowable tensile strain ε = max tensilestrain ε = allowabletensilestrain
t-max t-allow

Allowable deflection %
Δ = computeddeflect %Allowable = 5%
max
(recommended)

5 August 2009 CANDE 2007 Capabilities 6
16 Tutorial Problems
Method of
Example Solution Material Structure Installation Execution
Analysis
No. Level Type Type Type Mode
/ Design
…
7 2 R/C Box Embankment Analysis LRFD
8 2 Steel Pipe Embankment Analysis LRFD
9 2 Steel Arch Trench Analysis Service
10 2 R/C Pipe Embankment Design LRFD
11 2 Plastic Pipe Trench Analysis Service
12 3 R/C Box Embankment Analysis LRFD
…
5 August 2009 CANDE 2007 Capabilities 7
16 Tutorial Problems
Example
Design Features CANDE Interface Features
No.
…
7 N/A N/A
Uses slotted joints and Level 2
8 extended to add smaller construction N/A
steps above the crown of the pipe
Uses interface elements, Level 2
Shows inputting interface angles
9 extended to apply live load, and large
using the graphic interface.
deformation / buckling analysis
Includes soft backpacking soil around Shows how to modify chart properties
10
Pipe of graphs plotted using 'view/graphs.'
Profile analysis, includes interface
Shows how to modify the input file
elements, Level 2 extended to add
using the text input including inputting
11 soft haunches, long-term load
a user defined soil material and how
duration, and global and local buckling
to compute interface angles for a pipe
calculations
Shows a user generated Level 3
12 Identical to Problem 7, except Level 3
mesh
…
5 August 2009 CANDE 2007 Capabilities 8
16 Tutorial Problems
Example
Design Features CANDE Interface Features
No.
…
7 N/A N/A
Uses slotted joints and Level 2
8 extended to add smaller construction N/A
steps above the crown of the pipe
Uses interface elements, Level 2
Uses interface elements, Level 2
Shows inputting interface angles
9 extendede xtot eanppdley dliv teo l oaapd,p alyn dli vlaerg elo ad, and large
using the graphic interface.
deformation / buckling analysis
deformation / buckling analysis
Includes soft backpacking soil around Shows how to modify chart properties
10
Pipe of graphs plotted using 'view/graphs.'
Profile analysis, includes interface
Shows how to modify the input file
elements, Level 2 extended to add
using the text input including inputting
11 soft haunches, long-term load
a user defined soil material and how
duration, and global and local buckling
to compute interface angles for a pipe
calculations
Shows a user generated Level 3
12 Identical to Problem 7, except Level 3
mesh
…
5 August 2009 CANDE 2007 Capabilities 9
16 Tutorial Problems
Example
Design Features CANDE Interface Features
No.
…
7 N/A N/A
Uses slotted joints and Level 2
8 extended to add smaller construction N/A
steps above the crown of the pipe
Uses interface elements, Level 2
Shows inputting interface Sahnogwlse isn puusttiinngg i nterface angles
9 extended to apply live load, and large
the graphic interface. using the graphic interface.
deformation / buckling analysis
Includes soft backpacking soil around Shows how to modify chart properties
10
Pipe of graphs plotted using 'view/graphs.'
Profile analysis, includes interface
Shows how to modify the input file
elements, Level 2 extended to add
using the text input including inputting
11 soft haunches, long-term load
a user defined soil material and how
duration, and global and local buckling
to compute interface angles for a pipe
calculations
Shows a user generated Level 3
12 Identical to Problem 7, except Level 3
mesh
…
5 August 2009 CANDE 2007 Capabilities 10