doi:10.3850/978-981-08-7920-4_S2-S18-cd

ABSTRACT

Thebaseplates forcolumnswithlargeshear forcesare usually equippedwithshear lugs totransfer the column reactions to the concrete foundations. The shear lugs are welded to the bottom of the base plates and embedded in a concrete pocket filled with non-shrink, high strength grout. Current design philosophy for design of shear lug is to assume a uniformly distributed bearing pressure on one face of the shear lug to resist the applied column shear force. No consideration is attributed to the resistance of the other face of the shear lug that is in direct contact with the non-shrink grout. This paper attempts to demonstrate how the embedment of a plate/bar type shear luginsideanon-shrinkgroutpocketcaninfluence thebendingresistanceof theshear lugand thereby reducingits required thickness. Finite elementmodelsof the base plate/shear lug/anchor bolt systemwith non-linear support springs are utilized to simulate the base plate and shear lug bending behavior. Resulting shear lug flexural stress is then compared with that calculated by the conventional method. Sensitivity analyses are also performed to determine the effect of shear lug thickness and heightwith respect to a given base plate thickness.

Keywords: Anchorage, Base plate, Shear lug, Anchor bolt, Grout pocket, Plate bending.

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