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

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,

PDF

___

REFERENCES
Adams, M.T. and Collin, J.G. (1997). “Large model spread footing load tests on geosynthetic reinforced soil foundations.” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 123, No. 1, pp. 66-72.
Alamshahi, S. and Hataf, N. (2009). “Bearing capacity of strip footings on sand slopes reinforced with geogrid and grid-anchor.” Geotextiles and Geomembranes, Vol. 27, pp. 217-226.
Demiröz, A. and Tan, Ö. (2010). “An Experimental study for settlement of strip foundation on Geogrid-Reinforced Sand.” Scientific Research and Essays, Vol. 5, No. 21, pp. 3306-3312.
Kavazanjian, E., Hushmand, B., and Martin, G. (1991). “Frictional base isolation using layered soil-geosynthetic liner system.” Proceedings of the Third U.S. Conf. on Lifeline Earthquake Engineering, Los Angeles, CA, pp. 1140-1151.
Edincliler, A. and Yildiz, O. (2016). “Seismic performance of mid-rise buildings on geogrid reinforced sand.” 6th European Geosynthetics Conference, Ljubljana-Slovenia, pp. 1346-1355.
Edinçliler, A. and Toksoy, Y. S. (2017a). “Geogrid Donatılı Zemin Üzerine İnşaa Edilen Orta Katlı Binaların Sismik Performansına Deprem Karakteristiklerinin Etkisi.” 4. Uluslararası Deprem Mühendisliği ve Sismoloji Konferansı, 11-13 Oct 2017, Eskişehir, Turkey (in Turkish).Edinçliler, A. and Toksoy, Y. S. (2017b). “Geogrid-Donatılı Kum Üzerine İnşa Edilen Orta Katlı Binaların Sismik Performansının Değerlendirilmesi.” 3. Zemin-Yapı Etkileşimi Konferansı, İzmir, Turkey (in Turkish).
Edinçliler, A. and Toksoy, Y. S. (2017c). “Parametric Study on Seismic Performance of Low and Mid-Rise Buildings on Geogrid Reinforced Sand.” GeoAfrica 2017 Conference, Marrakech, Morocco.
Mahboubi A.R. and Keyghobadi M.H. (2012). “Numerical modeling of bearing capacity of a strip foundation on geogrid reinforced sand.” EUROGEO 5, Vol. 5, pp. 395-402.
Marto, A., Oghabi, M. and Eisazadeh, A. (2013). “The Effect of Geogrid Reinforcement on Bearing Capacity Properties of Soil under Static Load; A Review.” Electronic Journal of Geotechnical Engineering, Vol. 18, pp. 1881-1898.
Patra, C.R., Das, B.M. and Atalar, C. (2005). “Bearing capacity of a strip foundation on geogrid-reinforced sand.” Geotextiles and Geomembranes, Vol. 23, pp. 454-462.
Yegian, M.K. and Lahlaf, A.M. (1992). “Dynamic interface shear properties of geomembranes and geotextiles.” Journal of the Geotechnical Engineering, ASCE, Vol. 118, No. 5, pp. 760-779.
Yegian, M.K., Yee, Z.Y. and Harb, J.N. (1995). “Seismic Response of Geosynthetic/Soil systems.” Geotechnical Special Publication, ASCE, Vol. 46, No. 2, pp. 1113-1125.
Yetimoglu, T., Wu, J.T.H. and Saglamer, A. (1994). “Bearing Capacity of Rectangular Footings on Geogrid- Reinforced Sand.” Journal of Geotechnical Engineering, Vol. 120, No. 12, pp. 2083-2099.
Yıldız, A.A., Laman, M., Örnek, M. and Demir, A. (2006). “Numerical an Analysis Circular Foundations Supported by Sand Reinforced with Geogrid.” Second National Conference on Geosynthetics, University of Bogazici, Istanbul, pp. 75-84. (in Turkish).