Analisis Lendutan Perkerasan Sistem Pelat Terpaku Tiga Baris Tiang Menggunakan Modulus Reaksi Subgrade Ekivalen Izin

Oktavia, Ferly (2023) Analisis Lendutan Perkerasan Sistem Pelat Terpaku Tiga Baris Tiang Menggunakan Modulus Reaksi Subgrade Ekivalen Izin. Other thesis, Universitas Islam Riau.

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Abstract

The Nailed-slab System is a rigid pavement system consisting of slab and piles that have been installed under the slab and are connected monolithically. The piles as nails for the concrete slabs function so the settlement due to load distribution is smoother, increases the soil bearing strength, and increases the stiffness of the slab. Puri, et al., (2021) has conducted a study predicting the deflection of a single-pile nailed-slab using a allowable equivalent subgrade reaction modulus by modifying the additional subgrade reaction modulus Hardiyatmo Method, and obtained quite high deflection results. In practice, the Nailed-slab System pavement is designed with several piles. Therefore, this research was conducted to determine the pattern of deflection of three-row piles using a allowable equivalent subgrade reaction modulus with variations in global safety factors. This study used secondary data from the results of a full-scale test of Nailed-slab System pavement for repetitive compressive loads (Puri, et al., 2014). The allowable equivalent subgrade reaction modulus (k' a ) with variations in SF G (1.0; 2.0; 2.5; 3.0), variations in the shape and size of the pile cross-section, and pile length Lp = 1.7 m were analyzed using additional modified subgrade reaction modulus (?k m ) (Puri, et al., 2021). The analysis is carried out by observing the pile end resistance (Q b ) and the position of the load on the pavement plate. The deflection and moment of the plates were analyzed using the BoEF (Beam on Elast ic Foundation) method by using the “BoEF.xls” Program version 1.4. The results of the analysis show that the global factor of safety (SF G ) affects the plate deflection. The deflection increases with increasing SF G at the allowable equivalent subgrade reaction modulus (k' a ). The use of SF G = 1.0 has a deflection result that is closest to the observed deflection (Puri, et al., 2014). The pile end resistance has an influence on the plate deflection. The deflection without the end resistance of the pile (Q b =0) is higher than the deflection with pile end resistance (Q b >0). The deflection behavior with the loading position in the middle of the plate shows a deflection result close to the observed deflection (Puri, et al., 2014) and a maximum allowable deflection of 5 mm. Meanwhile, the deflection with the load on the edge of the plate tends to be over estimated. However, these results indicate that the performance of the system can be applied in the field.

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