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Randy Ruschak

About R3

Randy Ruschak has been involved in the engineering world since 1976. Upon graduation from Union College with degrees in Civil and Mechanical engineering he worked for 3+ years with NYPA. He then attended Columbia University for his MBA in Finanace & Management of Organizations. Following Columbia he was a management consultant to utilities - forming in 1983 what evolved into Navigant Consulting. He has been working in the internet world for many years - planning and designing web presence, internet marketing, eCommerce, SEO and mass-mailing programs

Crane Bridge Design

Crane Bridge Design
The CMAA Standard for Cranes: Becht Engineering recently completed the structural analysis for a single girder 5-ton crane bridge with an under-running hoist per CMAA-74 for nuclear waste handling operations.  CMAA is the Crane Manufacturers Association of America, and CMAA-74 is the Specification for Top Running and Under Running Single Girder Electric Traveling Cranes Utilizing Under Running Trolley Hoist.  The scope of CMAA-74 covers the crane classification, structural design, mechanical design, and electrical equipment.  The scope of CMAA-74 points to supplementary design codes, such as the building code (ASCE-7), and crane maintenance standards (ASME B30.11, ASME B30.17). CMAA-74 provides the design loads and criteria for the structural, mechanical and electrical crane components. Design Loads: Several structural factors must be addressed in the analysis and qualification of the crane bridge. They include the crane rated load and the number of load cycles. Designing the crane per CMAA-74, the number of cycles determines...
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Recent Comments
Guest — Fengyuan

About crane design

There are many important factors to consider when designing the crane, as it matters a lot to get a right and suitable crane for m... Read More
Wednesday, 21 June 2017 21:54
Guest — rashed habeb


what the service factor to design travelling gear box of overhead crane? where can i learn more abut overhead crane gearbox? thank... Read More
Saturday, 07 June 2014 16:51
Randy Ruschak

Traveling Gear Box

Rashed, On the overhead cranes that I have performed the stress analysis, the manufacturer of the crane procured pre-certified gea... Read More
Tuesday, 10 June 2014 19:16
Guest — Glen Pappas

Support Structure for Existing...

Hi, Michael. The 'runway beam' for my (Subject) crane is hung from the reinforced-concrete roof of a building. There are no calc... Read More
Wednesday, 14 May 2014 09:11
Randy Ruschak

Required steps to get crane ba...

Glen, To get the crane back in service you need to do the following three things: 1- Reconstitute the design analyses and show com... Read More
Thursday, 15 May 2014 11:43
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