In this article we discussed what is developement length or anchorage length  or dowels development length

After reading this article you will be able to answer

1) what is development length ?
2)why we provide development length 3)what will happen if we do not provide development length?

Introduction 👇

What is Development Length?

The minimum length of the steel bars which must be embedded in concrete beyond any section to develop its full strength. 

This is also called as an anchorage length   in case of axial tension or axial compression and development length in case of flexural tension or flexural compression. 

It is provided at column beam joint or column footing joint. Here you'll see within the picture this is often development length for beam-column joint. 

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This the most bar within the beam which is extended from here to here to securely transfer stresses from Beam to the column and this portion of length is called as development length.

Why do we provide development length?

Development length creates a secure bond between bar surface and concrete it also ensures during ultimate load conditions the reinforcement bar shouldn't sleep through the entire, it transfers stresses or loads from Beam to column smoothly now you understood why we offer development length.

What will happen if we don’t provide development length?

If we don’t provide development or if we offer less development length against the specified then The structures are going to be susceptible to encounter failure thanks to sleeping of joint in such cases the bars will not break first but the failure will happen at joints and laps prior to breaking of reinforcement bars. In short reinforcement bars will split from concrete.

Let us take the case of the beam-column joint during which development length isn't provided. If we apply force more than the maximum permissible limit then the restraining force between the beam and column will not be sufficient to hold the beam at its position.

The beam will begin from the column if the event length isn't provided during construction. The development is needed to provide support to the beam to reduces the chances of the beam coming out of the concrete column. Hence it acts as a supporting member for reinforced beam in the concrete column.