Analisis Variasi Faktor Aman Modulus Reaksi Tanah Dasar Sistem Pelat Terpaku Tiang Mini Beton Masif Tunggal Pada Lempung Lunak

Oktavia, Ferly (2019) Analisis Variasi Faktor Aman Modulus Reaksi Tanah Dasar Sistem Pelat Terpaku Tiang Mini Beton Masif Tunggal Pada Lempung Lunak. Other thesis, Universitas Islam Riau.

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Abstract

The Nailed-Slab Pavement System is the development from the pavement of the Cakar Ayam System which as an alternative solution to solve the problem of road construction in soft soil. This system is suitable for pavement, where the basic soil is influenced by differential settlement, because the interaction of soil-pole-plates makes the plate more stiff, therefore reducing the occurrence of different pavement surface settlement. The piles keep the plates in contact with the ground, preventing the plates from deforming and damage. The Nailed-Slab System using a thin pile cap in the form of reinforced concrete pavement and the bottom of the pavement plate there are short micro piles. In this study, an analysis was conducted to determine the deflection behavior of single pole Nailed-Slab System. The pole used in this analysis is a single massive concrete mini pile. This study uses data that refers to previous research (Puri, 2017). The equivalent modulus of the subgrade reaction will be calculated using the Modified Hardiyatmo Method, with various in the safety factor (1,0; 2,0; 2,5; 3,0), variation of cross section (20 cm x 20 cm, 25 cm x 25 cm, 28 cm x 28 cm, 32 cm x 32 cm), variation in length (1,2 m; 1,5 m; 1,7 m; 2,0 m) and the effect of pole end resistance (Qb) on deflection of the Nailed-Slab System, with loading located in the center of the plate. Calculation of deflection and force in plates using the BoEF (Beam on Elastic Foundation) method with the help of the "BoEF.xls" program Version 1.4. The results of the analysis show that the magnitude of the safety factor affects the value of deflection calculation. This deflection increases with an increase in safety factors. The analysis of the calculation of deflection with the size of the mini pile that is getting bigger results in smaller plate deflection, and the end pole resistance (Qb) greatly influences the deflection calculation in the single pole Nailed-Slab, due to deflection taking into account the pole end resistance (Qb> 0) smaller than deflection by ignoring the end of the pole (Qb = 0). Due to a single wheel load of 40 kN, deflection calculation tends to decrease and is lower than the allowed deflection of a maximum of 5,0 mm, especially when SF 1,0, however the deflection calculation greater than the deflection of observation. The average use of the safety factor 1,0 for each variation of the cross section with several loads has a smaller deflection calculation pattern than the maximum deflection (δa = 5 mm). SF variations and pole dimension variations have no significant effect on plate moments.

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