STRUCTURAL ANALYSIS IN EARTHQUAKE ENGINEERING A BREAKTHROUGH OF SIMPLIFIED NON-LINEAR - Printable Version +- Civil Engineering Association (https://forum.civilea.com) +-- Forum: eBooks (https://forum.civilea.com/forum-63.html) +--- Forum: Journals, Papers and Presentations (https://forum.civilea.com/forum-74.html) +--- Thread: STRUCTURAL ANALYSIS IN EARTHQUAKE ENGINEERING A BREAKTHROUGH OF SIMPLIFIED NON-LINEAR (/thread-5543.html) |
STRUCTURAL ANALYSIS IN EARTHQUAKE ENGINEERING A BREAKTHROUGH OF SIMPLIFIED NON-LINEAR - preceptor - 10-31-2009 STRUCTURAL ANALYSIS IN EARTHQUAKE ENGINEERING A BREAKTHROUGH OF SIMPLIFIED NON-LINEAR METHODS
info: Structural response to strong earthquake ground motion cannot be accurately predicted due to large uncertainties and the randomness of structural properties and ground motion parameters. Consequently, excessive sophistication in structural analysis is not warranted. For the time being, the most rational analysis and performance evaluation methods for practical applications seem to be simplified non-linear procedures, which combine the non-linear static (pushover) analysis of a relatively simple mathematical model and the response spectrum approach. In recent years, a breakthrough of these procedures has been observed. They have been implemented into the modern guidelines and codes. The paper discusses such procedures. After a brief overview of the methods, the major attention is focused on the N2 method, which has been implemented into the recent draft of the Eurocode 8 standard. The theoretical background of the extended version of the method, which can be applied for asymmetric structures, is presented. The similarities and differences between different methods, the determination of target displacement in the capacity spectrum method, the problems related to the application of simplified methods to analysis of 3D models, the approximations and limitations of the simplified inelastic methods, and the direct displacement-based design are discussed. Although different methods may yield in many cases similar results, they differ in respect to simplicity, transparency and clarity of theoretical background. The most important difference is related to the determination of displacement demand. The use is inelastic spectra is considered to be more appropriate than the use of highly damped equivalent elastic spectra. Keywords: non-linear analysis; pushover analysis; simplified non-linear methods; displacement-based design; inelastic spectra; torsion; asymmetric structures; Eurocode 8 |