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Modesto Junior College Science Community Center

This document explores the significant design challenges encountered during the construction of the Modesto Junior College Science Community Center. Key issues included excessive floor vibration criteria affecting various components like telescopes and planetarium doors, leading to increased costs of $1 million in steel beams. With 63 subcontractors, the project faced disruptions, including 33 facing bankruptcy, leading to a $2.4 million delay. Solutions included designing floor beams for specific load criteria and addressing the implications of subcontractor failures on the overall timeline and budget.

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Modesto Junior College Science Community Center

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  1. Modesto Junior CollegeScience Community Center

  2. Design Challenges • Floor Vibration Criteria • Telescope Vibration Criteria • Horizontal Drift Joint • Spiral Stairs • Steel Subcontractor – Walked Away • Moment Frame – Grade Beam Interface • Planetarium Door Widening

  3. Floor Vibration Criteria • Lab Consultant: • W3 x 18 with 4 ½” normal weight concrete over the top of flutes; total thickness = 7 ½”. • Vibration Criteria was Excessive – Added an additional $1,000,000 in steel floor beam cost to the project – $500,000 per floor. • Compromise Solution – District not having vibration issues in current facility: • Floor Beams: • Design for 125 psf Live Load, Non-reducible • Limit deflection to: • L/240 DL + LL • L/360 LL Only • Design floor beams as “non-composite” then install Nelson studs @ 12” oc. Foundation Model: Design for 80 psf Live Load (reducible) & 20 psf partition load (Designs like this give engineers a bad name!)

  4. Telescope Vibration Criteria

  5. Telescope Independent Space Frame

  6. Horizontal Drift Joint

  7. Spiral Stairs

  8. Steel Subcontractor Disappeared! Total number of subcontractors on the project =63 Number of subcontractors that filed for bankruptcy during construction of the Science Community Center = 33 Impact of steel subcontractor going away: $2.4 million 4 ½ month project delay Steel pieces scattered across the project site.

  9. Moment Frame Column Base

  10. Planetarium “Door Widening”

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