Contact Us Locations Project Briefs SERVICES MARKETS APPLICATIONS ABOUT RESOURCES CONTACT US Shear Bolts Published by Erik Guggenheim on March 16, 2021 Rebar misplacement and construction errors are never intended, but are a fact in today’s fast paced Construction Industry. The additional time and costs associated with retrofits have significant impacts to the projects and their completion. The Delta Structural Technology team assembled the help from Ravi Kantikar PE, Ankiet Borwanker PE, the Simpson Strong -Tie team, and Anna Polk PE along the research and testing done by Ms. Polk that made this project a success. Shear bolts are a new type of reinforcement developed for punching shear strengthening and retrofit of existing slab-column connections. The shear bolt consists of a headed vertical rod threaded at the other end for anchoring using a washer and nut system. The bolts holes were drilled through the slab, layers of Carbon Fiber were added from strengthening, a layer of glass fiber was installed as an insulator and the bolts were installed in holes drilled in a slab in concentric perimeters around the column. Advantages of CFRP Shear Bolt Retrofit Systems: The shear-bolt retrofit system performed as required to strengthen the slab and increase ductility. Installation was faster and less intrusive the removing the entire slab and columns; which allowed for adjacent construction to occur. The shear bolts provided the required increase in strength, sufficient to change the failure mode from punching to flexure. Shear bolts effectively prevented propagation of shear cracking in strengthened slabs. The ACI code punching shear strength predictions for specimens reinforced with shear bolts and CFRP are very conservative. Categories: BLOGNEWS Services Services Structural Strengthening Blast Mitigation Concrete Beam Widening Concrete Repair Corrosion Shotcrete Flood Protection Historical Preservation Near Surface Mounted Bars Non-Destructive Testing Post Tension Repair Carbon Fiber Strengthening Glass Fiber Strengthening Dry Flood Proofing FloodSafe Flood Doors Markets Markets Airports Bridges Chimneys Commercial Buildings Food Processing Facilities Hospitals Industrial Parking Garages Petrochemical Power Industry More Information Contact Us Locations Resources About Delta Why Choose Delta Application for Employment Request More Information Related Posts BLOG Ten Story Elevator Shaft Retrofit | Delta Structural Technology Reaching New Heights Composite Fiber Strengthening is reaching new heights. WacoTowerVideoFiberwrap Ten story elevator shaft retrofit… Time is money. Industrial plants cannot afford to shut down for construction. Yet when the only elevator shaft that supplies the facility Read more… BLOG SEAoK Conference | Kentucky Structural Engineers | Delta Experts in FRP Attending May 10th, 11th 2018 Speak with Justin Stalker with Delta Structural Technology at the SEA of Kentucky Conference in Lexington. SEAoK is the Structural Engineers Association of Kentucky, a charter member of the National Council of Read more… BLOG Blast Mitigation | How It Works | Experts at Delta FRP Case Study: Petrochemical Refinery Blast Mitigation A petrochemical refinery had a blast assessment performed to determine the buildings that might be in a blast zone. The report showed that the main control room was Read more… APPLICATIONS ABOUT DESIGN SERVICES FOR OUR CUSTOMERS HISTORY AWARDS WHY CHOOSE DELTA CONTACT US LOCATIONS APPLICATION FOR EMPLOYMENT Hestia | Powered by WordPress