Earthquake Resistant Structure

Electronic Journal of Structural Engineering, 6 (2006)

Seismic Pounding between Adjacent Building Structures
Shehata E. Abdel Raheem
Civil Engineering Department, Faculty of Engineering, Assiut University, Egypt E-mail: [e-mail]

ABSTRACT: Investigations of past and recent earthquake damage have illustrated that the building structures are vulnerable to severe damage and/or collapse during moderate to strong ground motion. Among the possible structural damages, seismic induced pounding has been commonly observed in several earthquakes. A parametric study on buildings pounding response as well as proper seismic hazard mitigation practice for adjacent buildings is carried out. Three categories of recorded earthquake excitation are used for input. The effect of impact is studied using linear and nonlinear contact force model for different separation distances and compared with nominal model without pounding consideration. Pounding produces acceleration and shear at various story levels that are greater than those obtained from the no pounding case, while the peak drift depends on the input excitation characteristics. Also, increasing gap width is likely to be effective when the separation is sufficiently wide practically to eliminate contact. KEYWORDS: Seismic pounding; Adjacent building; Energy dissipation; Seismic design 1 INTRODUCTION A quake with a magnitude of six is capable of causing severe damage. Several destructive earthquakes have hit Egypt in both historical and recent times from distant and near earthquakes. The annual energy release in Egypt and its vicinity is equivalent to an earthquake with magnitude varying from 5.5 to 7.3. Pounding between closely spaced building structures can be a serious hazard in seismically active areas. Investigations of past and recent earthquakes damage have illustrated several instances of pounding damage (Astaneh-Asl et al. 1994, Northridge Reconnaissance Team 1996, Kasai & Maison 1991) in both

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