Hilti Plate Bonding Technique: an Integral System for Structural Repair and Strengthening
Walter J. Ammann
Appears on pages(s):
bonding; ductility; plates (structural members); quality control; renovating; repairs; structural design; Structural Research
The plate bonding technique has been known and established in Europe for more than 20 years. Up to the present time, however, it has only been used in some specific applications. This is mainly due to the lack of an integral system approach. The increasing demand for strengthening, repair, and rehabilitation measures, especially in the field of the maintenance of structures, and the seismic upgrading or the change in use of structures ask for structural reliability and cost effectiveness. Both can be met with a new system approach for the plate bonding technique focusing on the requirements of engineering based design fundamentals; increase in ductility and strength, provided with permanent pressure applied to the steel plate; safe and easy handling on jobsite with adequate application system; overall quality control and assurance; integration of other plate/strip materials; and extension of the system to other subground material (masonry, wood, steel). A new system for the end anchorage of the bonded steel plates has led to a pronounced increase in ductility of the overall structural system so that the stringent requirements for structural elements used in engineering design can be met in full. A new design procedure is in development, based on extensive laboratory tests and preliminary field tests, as well as on finite element calculations. The new design procedure is fully in length with current developments in reinforced concrete design.