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# 23.5 Reinforcement Crossing Bottle-Shaped Struts

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For bottle-shaped struts designed using

**β**, reinforcement to resist transverse tension resulting from spreading of the compressive force in the strut shall cross the strut axis. It shall be permitted to determine the transverse tension by assuming that the compressive force in a bottle-shaped strut spreads at a slope of 2 parallel to 1 perpendicular to the axis of the strut._{s}= 0.75Reinforcement required in 23.5.1 shall be developed beyond the extent of the strut in accordance with 25.4.

Distributed reinforcement calculated in accordance with Eq. (23.5.3) and crossing the strut axis shall be deemed to satisfy 23.5.1, if

**.***f*' ≤ 6000 psi_{c}(23.5.3) |

where ** A_{si}** is the total area of distributed reinforcement at spacing

**in the**

*s*_{i}*i*-th direction of reinforcement crossing a strut at an angle

**α**to the axis of a strut, and

_{i}**is the width of the strut.**

*b*_{s}Distributed reinforcement required in 23.5.3 shall be placed orthogonally at angles

**α**and_{1}**α**to the axis of the strut, or in one direction at an angle_{2}**α**to the axis of the strut. Where the reinforcement is placed in only one direction,_{1}**α**shall be at least 40 degrees._{1}### Related Code Sections

23.5 Strut-And-Tie Models, Reinforcement Crossing Bottle-Shaped Struts

For

*bottle*-*shaped**struts*designed using β s = 0.75 ,*reinforcement*to resist transverse tension resulting from spreading of the compressive force ...
Building Code Requirements for Structural Concrete of New York State > 23 Strut-And-Tie Models > 23.5 Reinforcement Crossing Bottle-Shaped Struts

23.4.3 Strut-And-Tie Models,

of the concrete. Table 23.4.3—

*Strut*coefficient β s*Strut*geometry and location*Reinforcement**crossing*a*strut*β s ...
Building Code Requirements for Structural Concrete of New York State > 23 Strut-And-Tie Models > 23.4 Strength of Struts > 23.4.3

23.6 Strut-And-Tie Models, Strut Reinforcement Detailing

dimension of

*cross*section of*strut*(b) 48 d b of bar or wire used for closed tie*reinforcement*(c) 16 d b of compression*reinforcement*...
Building Code Requirements for Structural Concrete of New York State > 23 Strut-And-Tie Models > 23.6 Strut Reinforcement Detailing

23.6.3.1 Strut-And-Tie Models,

Spacing of closed ties, s , along the length of the

*strut*shall not exceed the smallest of (a) through (c): (a) Smallest dimension of*cross*...
Building Code Requirements for Structural Concrete of New York State > 23 Strut-And-Tie Models > 23.6 Strut Reinforcement Detailing > 23.6.3 > 23.6.3.1

23.4.1 Strut-And-Tie Models,

The nominal compressive strength of a

*strut*, F ns , shall be calculated by (a) or (b): (a)*Strut*without longitudinal*reinforcement*F ...
Building Code Requirements for Structural Concrete of New York State > 23 Strut-And-Tie Models > 23.4 Strength of Struts > 23.4.1