Pan Joist question
Pan Joist question
(OP)
Section 8.11.4 of ACI 318-99 says, "joist construction not meeting the limitations of [monolithic construction and certain rib width, depth, & spacing limitations] shall be designed as slabs and beams. What exactly are the differences between the design of slabs & beams vs. joists? I see in section 8.11.8 that you get a 10% bonus in shear strength for joists but, I am not aware of any other differences.





RE: Pan Joist question
Also, for joists, you can use 3/4" clearance instead of 1 1/2" (See Chapter 7 - section 7.7.1(c)). And joists get another break with minimum shear reinforcing (see 11.5.5.1(b))
References are from ACI 318-02.
RE: Pan Joist question
Wonder why with wood design you get a 15% bonus in flexural strength for repetitive members but nothing for shear. And in concrete design you get a 10% bonus in shear strength for repetitive members but nothing for flexure?
RE: Pan Joist question
And for concrete, the ability to engage multiple joists at one time and spread out flexural moments is more difficult due to the high rigidity of concrete....and for shear... I dunno.
Or its just how the codes morphed and evolved politically....who knows...