We have an existing flat roof 35' x 35' that was under designed and needs additional support. The flat roof is currently supported by 22k7 open web steel joists 5'-7" O.C (35' span). Based on structural calcs, the existing joist spacing is insufficient. We are proposing to add additional 22k7's between the existing joists (proposed spacing of 2'-9.5") and a W-shape at mid span for additional support. Can the W-shape support the 22k7 from its bottom chord or should the existing 22k7's be replaced to so that they are supported from their top chords? Also can it be assumed that the w-shaped has continuous support if the bottom chord of the 22k7 is welded to the w-shape?
Any recommendation or different ideas would be appreciated.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
Whatâ€™s driving the evolving landscape of truck electrification? What are the barriers, motivators and strategies for accelerating the electric transition? What insights and resources are available for todayâ€™s design engineers working to achieve industry disruption and evolution? For answers to these and other pertinent questions, read this white paper.
Many manufacturers rely on a product data management (PDM) system that once met their basic data management needs. As they expand their business and develop more complex products, they find their system falls short. Download the guide to find out how to meet your needs with PLM. Download Now
Beating out competitors, PTC has taken the number one spot to earn the Product Leadership Award 2019 from Frost & Sullivan. This award is given to North American PLM solution providers for excellence in digital transformation particularly with discrete manufacturing. Download Now
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. Download Now