Identification of Suitable Limit States from Nonlinear Dynamic Analyses of Masonry Structures

Nonlinear Dynamic Analysis of Masonry Buildings and Definition of Seismic Damage States

“…This approach is more appropriate than the one proposed in [2] in that structure-specific displacements, rather than universally applicable drifts, are used to define the damage states; this, of course, makes it more cumbersome, in that the pushover curve has to be estimated prior to deriving fragility curves, but this is generally considered as reasonable effort today. In a more recent study in Italy [5] alternative criteria were explored for defining DS1 to DS3 in nonlinear dynamic analysis; the finally suggested criteria are given in the last column of Table 1 and they involve pier strength and base shear of the building. It is noted that base shear based criteria are much more convenient to implement in nonlinear static, than in nonlinear dynamic (response-history), analysis.…”

Issues on the Use of Time-History Analysis for the Design and Assessment of Masonry Structures

“…An analytical study with the objective of proposing a suitable definition of significant limit states for masonry buildings, applicable to the results of incremental dynamic analyses (IDA, [31]) was conducted recently by the authors [32].…”

“…For this reason, in the analytical work of Mouyiannou et al [32] all the analysis results were interpreted according to two drift quantities, namely the maximum inter-storey drift δ max and a weighted average drift δ w , which were derived from nodal displacements and from element drifts respectively.…”

“…This shear drift is an output of the macro-element model, to which the shear behavior with stiffness degradation and strength deterioration is directly related and hence it is considered a suitable indicator of the level of damage in the element. The criteria proposed in [32] for the identification of each limit state are described in the following sections.…”

Estimation of Cumulative Seismic Damage to Urm Buildings During Earthquake Sequences

“…For example, the damage levels could correspond to significant damage states (DS), which would allow a direct calculation of loss when the DS are combined with corresponding loss values. Nevertheless, using damage levels independently defined from significant DS is preferred here because it does not require making assumptions on the definition of the limit states, whose uncertainty can have a strong impact on the procedure [10][11]. Lastly, the limit to the number of possible considered damage levels is also set by the need to derive bins with a reasonable number of NLTHA results for the derivation of damage distributions.…”