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THEATEAM
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Built in late 1800's by the Rockefeller Family. Filled spandrel sandstone bridge ... Filled arches are known to split. Separation Crack between gutter and wall ... – PowerPoint PPT presentation
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Title: THEATEAM
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THEA-TEAM
- Forest Hill Park
- Cleveland Heights/East Cleveland, Ohio
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Rockefeller Carriage Bridge
- Built in late 1800s by the Rockefeller Family
- Filled spandrel sandstone bridge
- Spans 130 feet / 16 feet wide
- Arch span of 30 feet
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Carriage Bridge Inspection
- Purpose
- Identify mechanism
- Estimate the future condition if left untreated
- Propose methods to rehabilitate bridge
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- Rusted Iron Retaining Bars
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- Filled arches are known to split
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- Separation Crack between gutter and wall
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Rehabilitation Recommendations
- Remove current bridge deck
- Restore spandrel walls
- Insert retaining bars
- Install concrete deck and drainage system
- Re-point all joints / remove moss and vegetation
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New Pedestrian Bridge Design
- Steel Truss Design
- HSS sections
- Concrete Deck
- Wooden Guard Rail
- 8 feet wide / 120 feet long
- Vertical clearance across bridge 9.5 feet
- Vertical clearance under bridge 20 feet
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New Steel Bridge
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Designed Loading
- Designed for 100 lb/ft2 live load
- Live load applied over entire span
- Wind load of roughly 6.25 lb/ft
- Wind load applied over all truss members
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Displacement
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Moment Distribution
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Element Axial Force Distribution
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Arch Capacity
- Jacques Heyman
- Three basic assumptions
- Masonry has no tensile strength
- Effectively unlimited compressive strength
- No slip allowed
- Plastic Analysis
- Applies Principle of Virtual Displacements
- No explicit equation readily available
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Arch Capacity Model
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Explicit Equation
- The explicit equation consists of over a thousand
characters - Finding the location of center of gravity
- Defined location of plastic hinges (Geometry)
- Determine direction sines and cosines
- Determine lengths between points
- Invoking Principle of Virtual Displacements
- Derive constraint and restraint equations
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Explicit Equation
- Solve 13 virtual displacements (In terms of
virtual displacement below point load) - Virtual displacement
- Calculate the weight of each Section
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Explicit Equation
- Based on assumptions, internal virtual work is
zero - Therefore, external virtual work equals zero
- Equation can now be applied to an iterative
program such as MatLab, to find the lower limit
of the archs capacity - First output from MatLab showed lower limit
occurring at ¼ the length of the arch (Similar to
Heymans assumption) - Equation can also be applied to SAP2000
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