Roof Joist Design Example

Ij 14 minor flange cuts.

Roof joist design example.

Calculate the dead load on a typical purlin. 2x joists rafters 2 or better 2. The table references have changed in the 2018 version of the irc. Access to the exam is available for purchase.

Draw the purlin and show the dead loading. Ce 331 spring 2002 joist and frame design example 1 2 1. Ij 10 rafter cut length table. Calculate the moment due to dead load.

Since the weight of a roof is fairly static it is easy to design for but engineers do need to think about issues like the accumulation of snow in cold climates layers of roofing materials added over the lifetime of the structure and changes in roofing materials when they determine. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. You can earn a ceu by watching the industry version of this webinar then successfully completing the related ceu exam. The even distribution of weight across a roof joist network is intended to prevent the roof from collapsing.

2003 international building code. Ij 5 joist to hip beam connection. Ij 8 glue nail floor composite action. Ij 16 bci web stiffener.

Example joist design for uplift bottom chord properties llllxx lllzz 24 better partners. Example joist design for uplift tension webs must be checked for compression c. Timber beam design seismic forces wind forces floor shearwall diagram lateral loads roof diaphragm design shearwall design continuous footing design. Example joist design for uplift bottom chord lyybraced by bridging y axis lyy better partners.

The design and construction of ceiling joists are found in section r802 4 of the irc. Let s consider a basic gable wood roof framing design. Design a typical floor joist for the two story office building indicated below. Ij 9 bci header table.

Design criteria and specifications a. Ij 13 multiple ply bci ajs member. Ij 6 2x ceiling joist connection. The allowable ceiling joist span tables in the 2018 version are found in section r802 5.

In this post we will cover wood roof framing members specifically ceiling joists. Here we have a wood framed gable roof. Continuing on from part 3. Draw the shape of the moment diagram below.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. For example a 24cj 1400 800 240 composite joist has a steel joist depth of 24 inches 610 mm a total factored composite load carrying capacity of 1 400 plf 20 4 kn m a factored composite live load capacity of 800 plf 11 7 kn m and a factored composite dead load capacity of 240 plf 3 5 kn m. Design of steel joist roofs to resist uplift quiz.