Strengthening and SHM system installation on RC slab using non-linear FE analysis

Abstract

Re-life of aged load-bearing structures may be more efficient and economical than complete re-building. Nowadays, the strengthening of an RC structure can be designed using non-linear FE analysis, taking a realistic structural behaviour into account. Within the current article, this process is demonstrated in connection with the strengthening of a monolithic RC slab. The slab must be strengthened due to a change of function which increases live load. To ensure satisfactory operation in SLS for increased load, the flexural strengthening of the slab by CFRP strips and bonded steel plates was considered. Static verification of the slab for original and increased loads is performed by linear FE analysis. The load-bearing capacities of the original and the strengthened slabs are also determined by non-linear FE calculation. A comparative analysis of the results highlights the effectiveness of different strengthening methods in increasing the stiffness and SLS capacity of the slab. To perform real-time monitoring of the slab in question, an SHM system is also suggested with the installation of three different types of sensors. This system increases the safety of operation and reduces future maintenance and strengthening costs.