recent innovations in cable-stayed bridge design … · recent innovations in cable-stayed ......
TRANSCRIPT
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Recent Innovations in Cable-Stayed Bridge Design and Construction
Presented by
Matthew J. Lengyel, PE, SE
Patrick D. Montemerlo, PE
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Introduction
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Overview
Brief history of cable stayed bridges
Modern cable stayed bridge structural analysis
Current practice of stay cable installation
Elements of modern stay cables
Presentation review and conclusion
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Cable Stayed Bridge History
Cable stayed bridge is a 400 year old concept
Modern cable stayed bridges started in 1950’s in Europe
Pasco-Kennewick Bridge first modern cable stayed bridge construction in the United States in late 1970’s
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Cable Stayed Bridge History
Parallel Bar Cable Stays (PBC)
Parallel Strand Cable Stays (PSC)
Parallel Wire Cable Stays (PWC)
Multi-Layer Cable Stays (MLS)
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Cable-Stayed Bridge History
Modern cable stayed bridges Parallel Strand Stay Cables (PSC)
Multi-Layer Cable Stays (MLS)
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Modern Structural Analysis
Evaluate the geometry of the bridge around other project needs
Roadway geometry
Vertical restrictions
Undercrossing restrictions
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Modern Structural Analysis
Define the geometry of the main bridge elements Deck width
Main span length
Side span length(s)
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Modern Structural Analysis
Define the geometry of the main bridge elements Superstructure type and geometry
Substructure type and geometry
Cable types and arrangement
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Modern Structural Analysis
Define how the main bridge elements will be constructed Balanced Cantilever
Unidirectional Cantilever
Cast-in-Place or Precast
Temporary Supports
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Modern Structural Analysis
Develop initial global analysis model Low discretization
Evaluate probability of successfully designing main elements
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Modern Structural Analysis
Develop global analysis and design model
Advance bridge geometry to wind load analysis and testing to obtain design data
Advance bridge geometry to obtain geotechnical and seismic design data
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Modern Structural Analysis
Develop local analysis and design models
Integrate design data from wind, geotechnical and seismic analysis
Iterate as necessary to produce a successful design
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Modern Structural Analysis
Common Design and Analysis Software Global Models
LARSA 4D
RM Bridge
MIDAS Civil
Local Models ADINA
ABACUS
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Current Practice of Cable Installation
Step 1: Survey bridge geometry
Step 2: Move stay cable construction equipment into position
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Current Practice of Cable Installation
Step 3: Weld HDPE stay pipe to required length
Step 4: Mark and cut king strand
Step 5: Pass king strand through stay pipe and secure
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Current Practice of Cable Installation
Step 6: Lift stay cable to upper anchor location and secure stay pipe to tower leg
Step 7: Pull stay cable to lower anchor location
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Current Practice of Cable Installation
Step 8: Pull king strand through live end anchor head, accurately position the mark from the face of the anchor head
Step 9: Install monostrand jack on live end of king strand
Step 10: Pull king strand through dead anchor head and hand seat wedge
Step 11: Stress king strand to required force
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Current Practice of Cable Installation
Step 12: With king strand now supporting stay pipe, run winch wire and sled down through stay pipe
Step 13: Cut and strip live end of next strand, connect to sled and pull strand up stay pipe
Step 14: Run next strand through live end anchor, install wedge and monostrand jack
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Current Practice of Cable Installation
Step 15: Pull next strand through dead anchor head and hand seat wedge
Step 16: Stress next strand to required force
Step 17: Repeat steps 13 thru 16 till all stay cable strands are installed
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Current Practice of Cable Installation
Step 18: Apply corrosion inhibitor to temporarily protect strands at anchorages
Step 19: Repeat Steps 1 thru 18 for all remaining stay cables
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Current Practice of Cable Installation
Step 20: Make final adjustments to cable lengths
Step 21: Lower expansion sleeves
Step 22: Install tension ring and friction damper
Step 23: Cut strand tails, install anchor caps and inject epoxy into anchor caps
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Strands and Monostrand Stressing
Modern stay cable strand 0.62 inch diameter seven wire strand
7% more area than 0.60 inch diameter strand
15 strands 0.62 dia. = 16 strands 0.60 dia.
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Strands and Monostrand Stressing
Modern 0.62 diameter stay cable strand 3% more dia. than 0.60
inch diameter strand
Still works with all 0.60 hardware and accessories
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Strands and Monostrand Stressing
Modern stay cable strand Grade 270, ASTM A416 for Greased and
Sheathed
Grade 270, ASTM A882 for Epoxy Coated
CFCC (Carbon Fiber Composite Cable)
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Strands and Monostrand Stressing
Stress all stay cable strands at once (previous practice)
Monostrand stressing stresses each stay cable strand individually (current practice)
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Strands and Monostrand Stressing
The goal of monostrand stressing should be to have all strands in the stay equal to each other and totaling to the global stay force by stressing each strand individually.
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Strands and Monostrand Stressing
Initial Stressing Considerations Number of strands to stress
Weight of stay pipe
Stiffness of entire stay cabled structure
Stiffness of each element relative to each other.
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Strands and Monostrand Stressing
First step is to install the the fist strand (aka the king strand)
All subsequent strand installed is stressed to match the current king strand force at completion of strand stressing
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Strands and Monostrand Stressing
Single strand stressing is accomplished in two stages Stage 1: Stress stay to percentage of final force to install all
strands and control cable sag
Stage 2: Retention all strands to final force desired at time of installation
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Strands and Monostrand Stressing
Stage 1 calculation considerations Structural stiffness changes with the installation of each
subsequent strand in a stay cable
A way calculate is to start with all strands assumed to stressed then de-stressing one by one to determine king strand force
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Strands and Monostrand Stressing
Stage 2 calculation considerations Minimal change in
stiffness as all strands are already installed
Neither ending force or beginning force in strand is zero
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Strands and Monostrand Stressing
Non-zero strand force complicates mathematics for Stage 2 Once Stage 1 complete, determining the “king strand” force is
more difficult as the rest of the strands are slakening during stressing.
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Strand and Monostrand Stressing
A solution is to use an iterative procedure for Stage 2 calculations Assume a king strand force
and iterate until an appropriate solution has been reached.
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Elements of Modern Stay Cables
Dead end anchorage Protection cap
Steel anchor head
Neoprene O-ring
Steel bearing plate
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Elements of Modern Stay Cables
Dead end anchorage Individual strand extension tubs and deviator assemblies
Steel guide pipe
Extension pipe and damper frame
Stay pipe HDPE support element
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Elements of Modern Stay Cables
Live end anchorage Protection cap
Adjustable steel anchor head
Ring nut
Steel bearing plate
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Elements of Modern Stay Cables
Live end anchorage Individual strand extension tubs and deviator assemblies
Transition pipe with mortar inside steel guide pipe
HDPE shim within to connect HDPE stay pipe to guide pipe
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Elements of Modern Stay Cables
Wedges Specific to stay
cable strand
Three wedge system
Typically single use wedges
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Elements of Modern Stay Cables
Tower cradles
Steel cradle sheathing
Steel cheese plates
Individual steel sleeve pipe for strands
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Elements of Modern Stay Cables
Tower cradle installation
Sheathing, cheese plate and sleeve pipes pre-fabrication
Secure tower cradle before tower concrete lift placement
Grout void space between sheathing and sleeve pipes
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Elements of Modern Stay Cables
Tower Cradle System benefits
Optimizing tower sections -reduces demands on towers by eliminating splitting forces
No “pinching” or “bundle” stress on strands that had to be accounted for in traditional saddles
Strand by strand replacement now possible (was not possible with traditional saddles)
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Elements of Modern Stay Cables
Tension Rings Located inside stay pipe before strands enter steel guide pipes
Bundles individual strands together to act as one strand
Reduces individual strand and stay cable vibrations
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Elements of Modern Stay Cables
Internal friction dampers Located a the deck level anchorages inside the stay pipe
Systems typically supply sufficient damping for most sizes and lengths of stay cables
Adjustable to actual field conditions
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Elements of Modern Stay Cables
External Dampers Hydraulic damper systems
Piston damper systems
Provides higher levels of damping than internal dampers
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Elements of Modern Stay Cables
HDPE stay pipes Helical fillets help reduce dry
cable vibration
Helical fillets also reduce rain wind induced vibrations (RWIV)
HDPE pipe meeting ASTM F714 highly durable and resistant to UV damage
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Presentation Review
Brief history of cable stayed bridges
Modern cable stayed bridge structural analysis
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Presentation Review
Current practice of stay cable installation
Elements of modern stay cables
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Conclusion
Modern cable stayed bridges Signature structures
Very efficient both structurally and financially (100 to 150 year service life typical)
Integrates design, construction and long term maintenance
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Recent Innovations in Cable-Stayed Bridge Design and Construction
QUESTIONS?Presented by
Matthew J. Lengyel, PE, SE
Patrick D. Montemerlo, PE