Response of buildings to near-field pulse-like ground motions

✍ Scribed by Malhotra, Praveen K.

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 249 KB
• Volume: 28
• Category: Article
• ISSN: 0098-8847
• DOI: 10.1002/(sici)1096-9845(199911)28:11<1309::aid-eqe868>3.0.co;2-u

✦ Synopsis

Ground motions a!ected by directivity focusing at near-"eld stations contain distinct pulses in acceleration, velocity, and displacement histories. For the same Peak Ground Acceleration (PGA) and duration of shaking, ground motions with directivity pulses can generate much higher base shears, inter-storey drifts, and roof displacements in high-rise buildings as compared to the 1940 El Centro ground motion which does not contain these pulses. Also, the ductility demand can be much higher and the e!ectiveness of supplemental damping lower for pulse-like ground motions. This paper presents a simple interpretation of the response characteristics of three recorded and one synthetic near-"eld ground motions. It is seen that for pulse-like ground motions*similar to any other ground motion*the Peak values of Ground Acceleration, Velocity, and Displacement (PGA, PGV and PGD) are the key response parameters. Near-"eld ground motions with directivity e!ects tend to have high PGV/PGA ratio, which dramatically in#uences their response characteristics.