Empirical fragility and ROC curves for masonry buildings subjected to settlements

In the Netherlands, potential damage to building stock due subsidence phenomena has recently received increased awareness. However, evaluating and predicting buildings in subsiding areas is a complex task that requires associating vulnerability of exposed structures with intensity hazard. Considering widespread presence subsidence-related built heritage, focus this study provide empirical-based insights assess forecast masonry buildings. A rich dataset manual levelling measurements was collected comprising 386 surveyed buildings, mainly low-rise (terraced) houses before 1950. Of total set 122 cases rest on shallow foundations 264 piled foundations. For each building, recorded related settlement, calculated from bed-joint measurements, using four different parameters, namely differential rotation, relative rotation deflection ratio. These parameters are appraised their capacity effectively predict damage. The Receiver Operating Characteristic (ROC) method used evaluate efficacy selected hazard parameters. (angular distortion) ratio observed as most accurate when damage, while settlement appears less accurate. Additionally, generate empirical fragility curves where probability described function aforementioned Thresholds were distinguish between light functional structural state. At 1/500 reach or exceed 13%, 5%. availability bed joint made it possible classify eight recurrent profiles, including both symmetric asymmetric associated overall deformation rigid rotations