Structural Design of Culvert Joints (2012) / Chapter Skim
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Pages 36-39
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From page 36... ...
- 34 - CHAPTER 4 CONCLUSIONS AND SUGGESTED RESEARCH This report presents the findings and conclusions of experimental and computational studies of the effects of longitudinal bending on joints in rigid (reinforced concrete) and flexible (corrugated steel and thermoplastic)
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From page 37... ...
- 35 - • the response under surface load of shallow buried corrugated steel pipes with momenttransfer joints rapidly attenuates away from the joint closest to the surface load; this attenuation means that surface loads in the vicinity of a joint connecting two particular pipes also results in negligible deformations at the other two ends of those pipes; • longitudinal bending influencing two particular shallow buried pipes connected by a joint is barely affected by the presence of other pipe segments or the joints that connect them; • nonuniform bedding conditions are required before earth loads can cause forces, moments or rotations across joints; efforts to define nonuniform bedding in the laboratory tests did not lead to clear guidance on what kinds of non-uniformity to consider in design. It was concluded that a simplified approach for the structural design of moment-release or moment-transfer joints connecting either rigid or flexible culverts could be developed by considering just two pipes interacting across a joint.
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From page 38... ...
- 36 - • the design equations for two rigid or flexible pipes interacting across a moment-release or moment-transfer joint provide a basis for a simplified design process that is suitable for implementation in the AASHTO LRFD Bridge Design Specifications • back-calculated values for the stiffness of the elastic soil springs varied widely, but fell within the range identified by Terzaghi for sands at various densities • a value of soil spring stiffness suitable for use in design calculations based on the simplified (i.e. two-beam)
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From page 39... ...
- 37 - since gaskets are generally fabricated from time-dependent materials like natural and synthetic rubbers. This could be undertaken using the pipe joint testing system developed for this project.
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