Barrier cable is a vehicular or pedestrian restraint system used in
parking garage
A multistorey car park (British and Singapore English) or parking garage (American English), also called a multistory, parking building, parking structure, parkade (mainly Canadian), parking ramp, parking deck or indoor parking, is a build ...
s. It installed along the ramps or around the perimeter of the parking structure. It consists of a 0.5-inch, 7-wire steel strand which is similar to the strand used in
Post-tensioned concrete
Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" ( compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. Post-tensioned concreted i ...
.
Types
There are three types of barrier cables systems:
Galvanized
Galvanized
Galvanization or galvanizing ( also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged ...
barrier cable is the most prevalent type of barrier cable used today. The steel strand is
Zinc plated
Galvanization or galvanizing (American and British English spelling differences, also spelled galvanisation or galvanising) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot ...
to protect it from corrosion per ASTM A475.
Epoxy-Coated
Epoxy
Epoxy is the family of basic components or cured end products of epoxy resins. Epoxy resins, also known as polyepoxides, are a class of reactive prepolymers and polymers which contain epoxide groups. The epoxide functional group is also coll ...
-coated barrier cable is used on occasion for aesthetic purposes. It is significantly more expensive than galvanized barrier cable.
Plastic-Coated
Plastic
Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
-Coated is similar to the steel tendon used in
Unbonded post-tensioned concrete
Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" ( compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. Post-tensioned concreted i ...
. The only difference is that plastic-coated barrier cable does not have a layer of Post Tension coating ("grease") between the
extruded
Extrusion is a process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section. Its two main advantages over other manufacturing processes are its ability to create very complex c ...
HDPE
High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a thermoplastic polymer produced from the monomer ethylene. It is sometimes called "alkathene" or "polythene" when used for HDPE pipes. With a high strength-to-density ratio, ...
plastic sheathing and the steel strand.
Anchorage
Depending on parking structure, the barrier cable is installed in rows of several cables.
There are several anchorage and attachment systems to concrete or steel columns.
Specification
The design and installation of the barrier cable system is referenced in the
Post-Tensioning Institute
The Post-Tensioning Institute (PTI) is a nonprofit organization committed to advancing the quality, safety, efficiency, profitability, and use of post-tensioning systems. PTI's manuals and technical guides provide guidance on the design, construct ...
's ''Specification for Seven-Wire Steel Strand Barrier Cable Application''s.
Benefits
7-wire Barrier Cable has a high strength-to-weight ratio of the strands and the cables cost less to place than precast panels, traditional cast-in-place or concrete masonry barriers.
Post-Tensioning Products & Systems
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References
External links
The Post-Tensioning Institute
- An international technical institute dedicated to post-tensioned concrete representing a community of professionals and businesses
{{DEFAULTSORT:Barrier Cable
Concrete
Building materials
Structural engineering