ConXtech is fully prequalified as a special moment frame for high-seismic projects. It’s codified in AISC 358, AISC 341, IBC and CBC. California jurisdictions with stricter design requirements, such as DSA and OSHPD have also approved for ConXtech use on public schools and hospitals.
In 2018, ConXtech expanded its product catalog and building footprint nationwide to offer hybrid solutions for non-seismic zones.
Engineering support materials and worksheets are available (click here) through the company to assist with calculations required by the AISC 358 Chapter 10 design requirements. Unlike the other prequalified moment connections in AISC 358, the size, number, and location of the bolts, the thickness of the various weldments to the beam and column, and the sizes of all of the welds do not change as they are all sized to support the largest possible beam. The calculations produced by the designer serve to demonstrate the capacity of the load path rather than determine the size and strength of the constituent parts. The columns and beams of the Special Moment Frame must be adequately sized to control the lateral displacement of the structure and resist all of the applicable load combination forces in ASCE 7 without exceeding the available strength of the members as determined by AISC 360. The members shall also be designed and detailed in accordance with AISC 341 seismic provisions, and the ConXL400 moment connections shall meet all of the eleven design checks required by AISC 358 chapter 10.
To make the design process as efficient as possible, ConXtech provides engineers with a standard set of details for the specified connections, including supporting documents for the worksheet to include in the EOR’s calculations package for submittal to the jurisdiction having authority.
ConXtech moment frame collars are used in a typical ConXtech space frame building to provide a lateral force resisting system and typically comprise a little less than 50% of all columns in the building. The other columns and beams that make up the steel in the building structure will not have collars. This gravity framing is comprised of columns and beams interconnected with simple shear connections at each end, and these gravity beams are detailed with ConXtech’s “lower and lock,” single row bolted shear connections. The gravity column and beam framing is used by default at all locations during ConXtech’s initial design, when the size of the composite simply supported beams and supporting columns are still being analyzed. Selected regions of the building near the extremities will be converted to the collar-connected moment framing as needed during the design for lateral forces, with the objective of optimizing both cost and erection speed.
ConXtech systems enable structural engineers to specify pre-detailed shear connections from design tables provided by ConXtech at all non collar joints to maximize efficiency on construction projects.
A full building design will include a combination of patented collar moment connections, ConXtech Gravity connections and many non-proprietary connections from the AISC manual as required by any given project. ConXtech will fabricate all components and erect the entire building structure, to ensure the type, location and quantity of ConXtech components offers the greatest potential for schedule acceleration on site.
If you’d like help contrasting a traditional approach to a steel building with a potential ConXtech solution, the company offers a free conceptual layout for any engineering team wondering how to “ConXify” their project in the early design phases, including a cost and schedule estimate (inquire here).