Studying the development length of post-tensioned wires is important because it is used to determine the amount of prestressing steel that needs to be used in a concrete structure to ensure that the steel is anchored securely and will not slip out of its anchor during service. The development length also plays a critical role in the overall structural integrity of the concrete structure, as it helps to ensure that the prestressed concrete can withstand the loads and forces it will be subjected to throughout its service life. Additionally, understanding the development length is crucial for designing and constructing safe, durable and efficient post-tensioned concrete structures.
The importance of development length assessment is to ensures safety for the concrete member during tensioning process and along the service life of the member, as the current codes including ACI 318-19 provides an equation for development length assessment which is based on experimental tests of several pretensioned members, and as it is known the difference between both pretensioned and post-tensioned techniques, the current equations might have to be reviewed. Also there are different types of embedded strand dead ends provided by the strand supplier, and every type of these dead ends could have different mechanisms in resisting the forces exerted on the strand.
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