EFFECTS OF GEOGRID REINFORCEMENT TO MITIGATE EARTHQUAKE HAZARDS OF MEDIUM-RISE BUILDINGS UNDER DIFFERENT EARTHQUAKE MOTIONS

Year 2019, Volume: 3 Issue: 2, 9 - 22, 01.12.2019

Ayşe Edinçliler , Yasin Sait Toksoy

Abstract

Shallow
foundations on the weak soils result in low bearing capacity and/or excessive
settlement problems. This can cause structural damage, reduction in the
durability, and/or deterioration in the performance level. Some of the soil
improvement methods are to replace the weak cohesive soil by a stronger
granular fill or to increase the dimensions of the footing, or a combination of
two. Recently, the use of reinforced soils under the shallow foundations has
received considerable attention. The beneficial effects of reinforcements in
foundation applications have been studied by several investigators. In
addition, the use of geosynthetics under foundations is an innovative and
alternative way of absorbing the seismic energy and mitigate excitations
transmitting to upper layers of soils and foundation of overlying structures.
This comparative study presents the results of numerical simulations of medium
rise buildings on unreinforced and reinforced sand foundation to investigate
the effects of earthquake characteristics and reinforcement length to mitigate
the earthquake hazards of medium-rise buildings. Various reinforcement lengths
in terms of foundation length “B” have been decided. The study has been carried
out by using a finite element code, PLAXIS 2D. Numerical results revealed that
the geosynthetic-reinforced sand is quite an effective method to mitigate the
seismic performance of the mid-rise buildings and earthquake characteristics in
addition to the reinforcement zone play a very important role by means of
seismic performance.

Keywords

Geogrid, Medium-rise buildings, Earthquake

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