Seismic performance assessment based on the interstory drift of steel buildings

Abstract

The seismic regulations for the seismic performance assessment of buildings use the maximum interstory drift, θ max, as a measure to control damage. This article presents a study of the seismic performance based on the θ max for steel buildings using Mexico's regulations and the RISK-UE and HAZUS guidelines. The capacity spectrum method is used to evaluate the performance of buildings with 3 different heights located in 4 cities in Mexico with different seismicity, as well as for soft and rock soil types. The HAZUS criterion is conservative in its assement of damage, while the RISK-UE criterion is more in line with the expected damage. The service state, S state , and the collapse prevention state, CP state , in Mexico's regulations are suitable for damage control, and are consistent with the damage proposed by the RISK-UE guidelines. In very high seismicity zones, the CP state for seismic actions equal to or greater than the expected, prevent building collapse; however, significant damage to buildings can still occur. The θ max of the CP state must be established for different seismic intensities and not only for building types.

Optimization of Structural Design in Steel Buildings Based on the Site-Specific Design Spectra of the Mexico Seismic Regulations

“…For the two scenarios examined, the definitive design of the structural elements was executed, and the allowable lateral displacements were scrutinized based on the maximum inter-story drift ratio (MIDR) to meet the service and collapse prevention conditions specified in the MDOC-CFE [5]. Presently, earthquake-resistant design standards world-wide regard MIDR as a highly effective parameter for damage control in the face of the intense seismic actions a building may encounter throughout its operational life [29,30]. The structure increased rigidity in both analysis directions due to seismic demands.…”