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US 7,421,827 B1Granted
Cellular stirrups and ties for structural members
OwnerApostolos Konstantinidisinventor
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OwnerApostolos Konstantinidisinventor
Estimating the term…
The present invention refers to stirrups and ties for structural members. Such stirrups and ties are used in all the structural members like columns, beams, slabs, footings, piles, chainages, lintels etc. The invention refers also to a method of reinforcement of structural members and to the structural members themselves. According to the invention the stirrup or tie consists of a load-bearing element for the fixing of the longitudinal rebars and for the undertaking of the tensile forces which develop during the loading of the structural members. The load bearing element consists of at least one cell of closed shape so that the flow of the tensile stresses developed in the cross section is closed and the stresses are not diffused to the concrete. The load bearing element of the stirrup or tie in accordance to the invention has a continuous cross section and thus there are no free ends as in the known stirrups. In this way anchoring of the stirrups or ties is completely avoided. The closed cellular shape has no discontinuation and may be simple, for example, rectangular, circular, T-shaped, I-shaped, etc. or complete, for example, square with inscribed rectangular, circular with inscribed per square etc.
A stirrup or tie for the reinforcement of concrete structural members, comprising at least one load bearing element to receive rebars of the reinforcement, wherein the at least one load bearing element is made from a composite material and a) forms at least one plane cell of closed shape with an inner periphery to receive the rebars of the reinforcement, which are arranged on at least two planes, and b) has a continuous cross-section to carry axial tensile force developed when the structural member is loaded, so that the flow of the tensile stresses developed in the cross-section of the at least one load bearing element is closed and continuous and is not transmitted to the surroundings of the stirrup or tie.
A reinforcement for concrete structural members, comprising longitudinal rebars and stirrups or ties, including at least one load bearing element made from a composite material and having at least one plane cell of closed and continuous shape and continuous cross-section and connected with the rebars transversely or at an angle.
A method for construction of a concrete structural member comprising the following steps:
A concrete structural member comprising longitudinal rebars, stirrups or ties which interact with the rebars, and concrete which surrounds both the rebars and the stirrups or ties, wherein the stirrups or ties comprise a load bearing element made from a composite material for receiving the rebars, and the load bearing element a) forms at least one plane cell of closed and continuous shape with an inner periphery to receive the rebars which are arranged on at least two planes, and b) has a continuous cross-section to carry axial tensile force developed when the structural member is loaded, so that the flow of the tensile stresses developed in the cross-section of the load bearing element is closed and is not transmitted to the surroundings of the stirrup or tie.
Dependencies are inferred from the claim text.