The Analysis of Modified of Cakar Ayam (CAM) Designed with Concrete Plate Thickness Variation in Soft Soil

Abstract

Modified of Cakar Ayam System (CAM) is a system that uses galvanized steel pipes as stiffener plate. This system had been implemented on the trial road of Pamanukan-Indramayu, Indonesia. Many advantages are obtained from the use of this system, for example reduction on deflection, durability, and application on road pavement. Full scale trials had been conducted in Indonesia, for the examples, the Waru-Surabaya Highway and Section IV Highway, Makassar. Despite this system is widely used but there are still many problems occur such as deflection and crack due to less plate thickness. This research will discuss about the deflection, moment and shear force of plate model on soft base ground using Finite Element Method (FEM). The system configurations for concrete plate applied in this research were 7.25 m in width and 14.0 m in length with thickness was varied by 0.15 m, 0.18 m and 0.22 m using 21 cakars. The loads represented semi-trailer truck loading with the weight of each axle propagated into 2 equal uniform loads. The position of test loading points were made in several variations to determine the largest deflection value. If the plate got thicker then, its stiffness value would increase and the deflection accorded smaller result. By using CAM System, cakar could function as a load restraint and plate grip. The stiffness of the plate would increase when the plate was applied with the CAM System and could reduce deflection by 2.74% to 39.77%. On the effect on the moment and shear force, it was found that the thicker the plate, the greater the moment and shear force value obtained. The difference in the value of the moment obtained from the comparison between the plate using the CAM System and the plate without the CAM System was 0.23% to 1.60%, while for shear force values, the difference was 7.56% to 11.19%.

Pembebanan Model Pelat Skala Kecil Perkerasan Kaku (Rigid Pavement) Di Atas Tanah Pasir

“…Uji model Sistem Cakar Ayam semi 3D dan 3D di laboratorium, dan membandingkan lendutan yang terjadi dengan analisis finite element BoEF, analisis ini mengacu pada hitungan lendutan pelat . Metode ini cukup baik untuk menghitung pengaruh cakar terhadap lendutan pelat, dan memberikan nilai lendutan lebih besar dari pada hasil pengamatan, Pempadi (2000) dan Hetenyi (1974). Tinjauan terhadap sistem perkuatan dengan pipa Cakar Ayam telah dilakukan dengan model matematis dalam analisis Sistem Cakar Ayam dengan MEH, Ariseno dkk.…”