An effective method of strengthening reinforced concrete structures with low shear resistance and its CAD implementation during building reconstruction

Abstract

The proposed technology involves  directly increasing the amount of shear reinforcement results in a proportional increase of the shear resistance, and the solutions available presently in the industry are typically minimally invasive and will reduce disruption to other members. Conversely for the concrete shear resistance, the use of other solutions typically results in an under-proportional increase, apart from concrete overlay, which is accompanied by its own trade-offs.

In recent years, the development and sufficient maturity of post-installed anchoring technology have led its use in applications beyond steel-to-concrete fastenings and concrete-to-concrete connections. One use in strengthening is in concrete overlay where both bonded and mechanical fasteners function to reinforce the interface between the existing and new concrete.

Another use of the bonded anchor system in strengthening is in a recently developed Hilti strengthening solution “HIT-Shear” which directly increases the resistance to shear loading of reinforcement concrete members, akin to cast-in stirrups.

Hilti’s cloud-based design software Profis Engineeringincludes a new dedicated module for assessing and strengthening concrete members deficient in shear that assists structural engineers when evaluating the resistance of existing members and strengthening them, thereby ensuring a safer and more efficient workflow, with subsequent implementation in the CAD system module.