UJI KAPASITAS TARIK FONDASI TIANG APUNG PADA TANAH PASIR

Abstract

A foundation structure should be designed to detain uplift force in construction built to detain rolling moment such as dock, water tower, and telecommunication tower. This research was carried out to perceive the behaviour of tension capacity of floating pillar on sandy soil and the comparison of ultimit capacity, shear resistivity tension and soil stress coefficient between the experiment result and theoritic calculation. The research was done by building a model in laboratory using a pillar made of plexyglass with diameter d = 2,5 cm and length variation of L = 15 cm ; 20 cm ; and 25 cm, and space s = 2,5 d ; 3d and 4 d with single pillar configuration, 2 pillars, 3 pillars and 4 pillars configuration. The research result showed that on single pillar, the average tension capacity of pillar was 72,3% bigger than the result of calculation using Poulos and Davis method, and 93% bigger than the result of calculation using Broms method. The vertival displacement at the collapse point was 2,8% of pillar diameter ; shear resistivity tension and soil stress coefficient was 74,7% and 74,6% bigger than the result of calculation using Poulos and Davis method, and 94,7% and 94,6% bigger than calculation using Broms method. Whereas on pillar groups, ultimit tension capacity pillar group was 55,7% bigger than the result of calculation using Poulos and Davis method, and 86,2% bigger than the result of calculation using Broms method. The average vertical displacement at the collapse point was 3,4% of pillar diameter, average shear resistivity tension and soil stress coefficient were respectively 55,4% and 57,9% bigger than the result of calculation using Poulos and Davis method, and 92,1% and 91,1% bigger than the result of calculation using Broms method.