Seismic analysis of adjacent buildings subjected to double pounding considering soil\u2013structure interaction

Ahmed Abdelraheem Farghaly

doi:10.1007/s40091-017-0148-y

Ahmed Abdelraheem Farghaly

Open Access

https://doi.org/10.1007/s40091-017-0148-y

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Abstract

A 2D model of two adjacent buildings with different heights (6 and 12 floors) and foundation levels without separation distance under seismic load and considering SSI is investigated. A special arrangement of contact elements (gap elements) each 1 m of the low height building in the contact zone is taken into consideration to fulfill all possible deformation contact modes which take place under seismic load (earthquake). Soil is modeled by 2D shell elements in contact with foundations of the two adjacent buildings. This paper focuses on the study of double pounding that takes place between the two adjacent buildings in some upper points at superstructure in the contact zone and also at foundation level. The forces of double pounding between the two adjacent buildings, which increase by softening of the soil, give a valuable assessment of straining actions of the two adjacent buildings and change the behavior of soil under the foundations and around basement floor.

Highlights

Impacts due to structural pounding transmit short duration, high-amplitude forces to the impacting structures and may occur at any level of the colliding structures and at any location along the impacting levels
This paper studies the seismic analysis of two adjacent buildings with different heights subjected to double pounding considering soil–structure interaction (SSI) and includes into consideration the pounding in the level of foundation especially for different levels of the adjacent building foundations, where the forces in the contact elements between the two foundations get bigger when the soil gets softer, so the double pounding between two adjacent buildings of different heights and foundation levels without separation distance under seismic load and considering SSI will have an important effect on the design procedure of such buildings
Pounding increases top lateral displacement of the short (6 floors) building by 1.4 times, and for the tall (12 floors) building decreases it by 1.78 times than the single building cases when taking in consideration SSI, rather than fixed-base system, but at foundation level the short and tall building lateral displacement increase by 1.38 and 1.2 times than the corresponding values in single buildings with SSI effect

Summary

Introduction

Impacts due to structural pounding transmit short duration, high-amplitude forces to the impacting structures and may occur at any level of the colliding structures and at any location along the impacting levels (in the case of disparateCivil and Architectural Constructions, Faculty of Industrial Education, Sohag University, Sohag, Egypt story heights of the adjacent buildings resulting in slab– column impacts or collision at the foundation level).

Results

Conclusion