Torsional effects due to concrete strength variability in existing buildings

The Effects of the Axial Load Variation on the Seismic Performance of Existing Rc Buildings

“…The sample structure [13], shown in Fig. 1, is a 4-story 3D reinforced concrete frame, symmetric along both x and y directions, with two 4.5 m long bays in the y-direction and 5 bays 3.5 m long in the x-direction, designed for vertical loads only.…”

“…The second one provides for a Gaussian representation of the probabilistic distribution of the concrete strength. In the Gaussian representation, the strength domain is defined [11][12][13] Figure 1 Plan configuration of the case-study and structural features of the RC members.…”

“…The study is carried out with reference to a case-study, i.e. a doubly symmetric 4-storey RC building [9][10][11][12][13], representing a typical example of pre-seismic code structure.…”

“…Three different CoV values, respectively equal to 15%, 30% and 45%, consistent with a large database of experimental values [14][15] have been assumed in the analysis. Each strength distribution has been discretized into seven percentile values, respectively equal to 5%, 10%, 20%, 50%, 80%, 90% and 95% [13,16].…”

Combined effects of axial load and concrete strength variation on the seismic performance of existing RC buildings

“…The study is carried out with reference to a case-study, i.e. a doubly symmetric 4-storey RC building (De Stefano et al 2014a, 2015, representing a typical example of pre-seismic code structure. The seismic performance, expressed as the ratio between demand (D) and capacity (C), has been checked at the 1 st storey columns only, since they resulted the most affected by the axial load variation.…”