Typical Buildings Final Structural Scores

Abstract eng:
Rapid Visual Screening, RVS, of Buildings for Potential Seismic Hazards – A Handbook, is a procedure developed under FEMA 154 Report, originally issued on 1988 and then updated as Edition 2, on March 2002 [1]. The procedure is designed to be implemented without performing structural analysis calculations and enables classification of surveyed buildings in two categories: risk acceptable to life safety and seismically hazardous. The procedure involves the scoring system of the buildings compatible with ground motion criteria in the FEMA 310 Report (ASCE, 1998) [3] and the damage estimation data according to HAZUS damage and loss estimation methodology and fragility curves (NIBS 1999) [4]. Finally cut-off scores are determined; i.e. a building receiving a high score is considered to have adequate seismic performance, whilst a building with low score should be further evaluated by a professional engineer in seismic design. The scoring system utilizes two steps: identification of the primary structural lateral-load-resisting system and identification of building attributes that modify the seismic performance expected of this lateral-load-resisting system. The Final Structural Score, S, represents an estimate of the probability that the building will collapse if ground motions occur that equal or exceed the Maximum Considered Earthquake (MCE) ground motions. The buildings evaluated to have a cut-off value of S larger than 2, are considered to provide an excess of 90% confidence of being able to withstand earthquake with 2% probability of exceeding in 50 years. The buildings with cut-off score S ≤ 2, are considered as inadequate and shall be studied further from and earthquake engineer. The S is based on the Basic Structural Hazard Score, BSH, and Score Modifiers, SMs. The BSH represents a generic score for a type or class of building, and is modified for a specific building by Score Modifiers (SMs) specific to that building. The direct benefits of the procedure include the time efforts to review and investigate in detail a massive number of buildings and identification of unacceptable weak structures to be further analyzed and rehabilitated. The final benefits of the procedure results in saving of lives and prevention of injuries, reduced damage and fewer major disruption of daily lives and businesses. This study is performed to adopt the procedure, whilst to revise the input parameters for basic structural hazards score and score modifiers to meet the site specific spectral accelerations and capacity curves for the local building typology matrix in city of Pristina, Capital of Republic of Kosovo. Typical Final Structural Scores can be obtained then for the considered building typology matrix, which depending of the final value can be subject to further evaluation from structural earthquake engineer for verification of performance stability.

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