Innovative Seismic Retrofitting Techniques for Reducing Vulnerability of Reinforced Concrete Structures A. Ziraoui1,∗, B. Kissi1, H. Aaya2 1 University of Hassan II, National High School for the Arts and Professions, LISPSII, Casablanca, Morocco 2 International University of Casablanca, Morocco ∗ adil_ziraoui@hotmail.com Keywords: Pushover Analyses, Seismic Vulnerability, Seismic Retrofitting. The occurrence of earthquakes is known as one of the most unpredictable and destructive natural hazards in the world that brings tremendous economic losses and deaths of people. Although the control of structures to improve their performance during earthquakes began to be investigated in the prior times, the implementation of the techniques and construction practices considering the seismic loads just began after 1970. Recent earthquakes such as Pakistan earthquake (2005), Sichuan earthquake (2008), Haiti earthquake (2010) and Chile earthquake (2015) demonstrate the vulnerability of buildings structures. After those devastating events, many seismic zones were upgraded by half or more degree. Consequently, many buildings did not complied with new seismic code requirements and thus needed to be seismically retrofitted. Retrofitting consists of reducing the vulnerability of damage of an existing structure during a future earthquake. It aims to strengthen a structure to comply with the requirements of the current codes for seismic design. Recently, different advanced methods for seismic retrofitting have been reported in the literature. These range for applying different materials such as steel, concrete, fiber-reinforced, polymers, and shape memory alloys as strengthening materials used in various methods applications. In this paper, different innovative techniques used to increase the seismic performance of Reinforced Concrete (RC) structures are presented. It gives the advantages and disadvantages of each retrofit technique and the corresponding characteristics enhancements. Application of one technique (Base isolation technique) is done in a RC prototype structure and comparison on the performance of the structure with and without the retrofitting scheme is carried out. It is concluded that energy dissipation devices are very efficient improving the structure behavior. References [1] Y. Riyad , B. Kissi , I. Mrani , M.A. Parron , R.C.M. Dolores . Seismic Retrofitting: Reinforced concrete shear wall versus CFRP reinforced concrete using pushover analysis [2] M. Mouzzoun, O. Moustachi, A. Taleb, Assessment of the behavior factor for seismic design of reinforced concrete buildings. J. Mater. Environ. Sci. 4 (1) (2013) 23-32 (in French). [3] Applied Technology Council, ATC-40. Seismic evaluation and retrofit of concrete Buildings, California, 1996; Vols. 1 and 2. [4] Federal Emergency Management Agency (FEMA), 1997.NEHRP provisions for the seismic rehabilitation of buildings. Rep FEMA 273 and 274. Washington, DC : FEMA. 69
RkJQdWJsaXNoZXIy MjM0NDE=