CESARE'24

BEARING CAPACITY AND RESILIENCE OF EXISTING RC BUILDINGS STRENGTHENED BY STEEL BRACING SYSTEMS UNDER SEISMIC HAZARD

Not scheduled

20m

Speaker

Mr Theofylaktos Somonoudis (Student)

Description

In the present paper a numerical analysis is proposed to evaluate the level of bearing capacity and resilience of interventions in existing reinforced concrete (RC) buildings with steel bracing systems with regard to seismic hazard. This strengthening scheme depends on the building design data and characteristics and has to be applied in combination with other known damage repairing techniques to restore the bearing capacity of the concrete cross-sections. As a matter of fact, the insertion of steel bracing systems to the load bearing system of the building increases the resilience of the building to seismic hazard [2] and can lead to the extension of its service life with respect to different performance levels. As an example of this methodology the case of an existing 8-story RC undamaged building model is checked here; the analysis is performed by using respectively FEM computer models of the building that is strengthened with inverted-V steel bracings [3], on discrete spans of the existing frames in respect to different performance levels according EPPO (Earthquake Planning and Protection Organization) of Greece [1]. The results of this parametric analysis highlight alternative cost-competitive methods of strengthening existing RC buildings with the aim of increasing their durability and remaining life time.
REFERENCES
[1] E.P.P.O. (Earthquake Planning and Protection Organization of Greece) (2017) Code of structural interventions Second Review. October 2017, Greece (in Greek).
[2] Ishimura M, Sadasue K, Miyauchi Y, Yokoyama T, Fujii T and Minami K, (2012) Seismic performance evaluation for retrofitting steel brace of existing RC building with low-strength concrete”, Proc. of the 15th World Conf. on Earthquake Engineering, 15th WCEE, 24-28, Sept. 2012, Lisbon, Portugal.
[3] Kim, S.-H., and Choi, S.-M. (2015). Structural behavior of inverted V-braced frames reinforced with non-welded buckling restrained braces. Steel and Composite Structures, 19(6), 1581–1598.