8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 3 Chapter 8B : Analysis- Part 2: Existing buildings from OS and masonry by the Equivalent Frame Method The 8th Module is called "ANALYSIS" and includes the following 3 groups of commands: o Script o Results o Show • FOREWORD The analysis methodologies used to evaluate or redesign existing reinforced concrete structures for seismic loads are elastic analyses, static or dynamic, and inelastic analyses (i.e. non-linear due to material), also static or dynamic. The elastic methods adopt the classical linear stress-strain relationship for the structural elements of the structure, where in approximate ways (e.g. using global or local indices of behaviour or ductility) they indirectly take into account the inelastic behaviour of the structure. These methodologies are simpler to apply, but may lead to less accurate results than their inelastic counterparts. On the contrary, inelastic analysis methodologies help to better monitor and understand the actual response of the structures, demonstrating both the failure mechanisms and the potential for progressive collapse (it is therefore possible to control the deformations of the ends of the members, the overstrength reserves, as well as the way in which the lateral behaviour of the structure is triggered. In this way, inelastic analyses lead to a more rational and safer design. The inelastic dynamic analysis (i.e., time history analysis with direct numerical