Sir, Happy to see you in CE. i had read many of your posts in SEFI.P.K.MallickIs it required to provide development length for compression for column bars extending into footing?
By understanding the physics, there is no need for anchorage the column bars in footing in case of compression. Because the concrete itself take the compression.
May be it will help at the time of buckling, tensile force etc. other than the compressive force.
Correct me, if i am wrong?
for safely transfer of load from column to footing it is necessary to provide development length.
Development length in compression = σ st φ/ 4(1.25) τ bd
The design is based on the reinforcement that achieves yield stress, therefore the reinforcement must be properly bonded to the concrete for a finite length to avoid slipping. This sufficient length to anchor bars close to the end of the connections is called the length of development, ld. The development length equation according to ACI 318 is presented here: