Anti-Seismic Lap Option - Column Reinforcing


Product(s):ProStructures
Version(s):CONNECT Edition (10.XX.00.XX)
Environment:N/A
Area:Concrete
Subarea:Column Rebar Placement
Original Author:Kemuel Jancorda, User Success Team

Overview

When modeling concrete columns especially in building structures, it is critical to detail a column when the bar lengths exceed the stock lengths. Hence, it is necessary to introduce lap splices at the lapping zones as prescribed by most structural codes.

The confinement zones in columns are generally designed to resist high tension during any seismic activity. Tensile action on lap splices such as pulling out and splitting can be controlled by setting a required splice length to develop sufficient tensile strength to the discontinuous bars, however, this promotes more bar congestion, higher cost, and will put much more risks against any accidental lateral forces. Therefore, it is recommended to position the lap splices away from these zones.

Another thing to consider is the staggered laps. Most column designs are generally utilizing up to two-thirds (2/3) of the maximum reinforcement ratio of the gross sectional area. This is to clear the way for up to 50% more reinforcement sectional area in overlapping zones and can possibly done by staggering the laps. This detailing practice is very critical to avoid an overdesigned column.

The anti-seismic lap option can accessed under Column Reinforcing dialog > Lap Options > Manual Lap > Anti-Seismic.

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