Evaluation of nonlinear dynamic behaviour and determine performance level of concrete buildings with very high importance (designed based on Iranian Standard NO.2800 – 4th Edition)

Abstract

The Iranian seismic code (standard NO.2800) provide minimum provisions and regulations for the design and construction of buildings to resist the earthquake effects that by these provisions, it is expected the purpose of this code satisfying. Since the terms and provisions provided in the standard 2800, is based on resistance design, so consider this standard to meet performance targets, quantify performance levels and damage to buildings during earthquakes there may be confusion exhibit that the uncertainty principle would be more serious in buildings with higher importance. The seismic behaviour of very high importance buildings according to Iranian Standard NO.2800 (IS2800) is that; these building not affected the strength and stiffness of structural and non-structural components in design level earthquake, so that serviceability is possible. Therefore, in this research 3, 6 and 10 storey reinforced concrete buildings with very high importance (hospital use) that according to the provisions and regulations of IS2800 (4th Edition) and ACI code are analysis and designed in SAP2000 software, to be studied. In this paper by using nonlinear static and time history dynamic analysis of the building models under far and near fault records, the performance level of buildings is determined and then about to meet the purpose of Iranian Standard NO.2800 for the very high importance buildings is concluded. The obtained results show that in the nonlinear static analysis method for the 10 story building and in the nonlinear dynamic time-history analysis method for all buildings, the expected performance level of IS2800 (immediate occupancy) is not satisfy.

Keywords

• performance level
• standard 2800
• nonlinear analysis
• concrete buildings
• very high importance