#TITLE_ALTERNATIVE#

• Main Author: Rifai (NIM 250 94 066), Ahmad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7095
• Institution: Institut Teknologi Bandung

Abstract : <br /> <br /> <br /> Many geotechnical engineering problems involved soil-structure interaction. Most of those problems are solved by neglecting the influence of soil-structure interface. This research experimentally studies the behaviour of soil-pile interface and the effect of interface element in numerical analysis with non linier soil material finite element program. For the purpose of modeling the soil and interface more realistically in non tinier finite element simulation need both soil and interface parameters. Hyperbolic soil model, hyperbolic interface model and HiSS interface model are used in this research. <br /> <br /> <br /> The soil parameters are based on conventional triaxial compression test result and the interface parameters are taken from the modified direct shear test result. In this research the modified direct shear equipment have been installed, which have more advantages than the conventional direct shear equipment. Those advantages are the ellimination of non uniformn stress distribution and rotation at shear box at shearing operation. <br /> <br /> <br /> Programs to compute both hyperbolic and HiSS soil and interface model parameters were developed. In addition, program for back prediction of the soil and interface parameters were also developed. The soil that is used in this research is the Cilacap sand with relative density of 50%, relatif density of 70% and soil from the location of Graha Kuningan project in Jakarta. The result from the back prediction pointed that the soil parameter is qualified for the input data in finite element simulation as long as the strain in the soil is under 5%. <br /> <br /> <br /> Small scale model pile test were performed with strain and load measurements from strain gauge, LVDT, dan load cell, controlled electronically with a data acquisition system. This model test is also simulated in non linier finite element by using EPSSIP package that is supported by hyperbolic and HiSS soil and interface models. So, it can verified and study the interface behaviour, interface element role and the reliable of the non linier finite element program. Case study in the field is also done to evaluate instrumented load test and tension test. <br /> <br /> <br /> Hyperbolic soil and interface models aplication on both axial compression instrumented load test and tension test gave the better prediction result, those are seen from rasio of load displecement respons and load transfer that is more closer. In the sand-soil case, the HiSS interface model gave a better performance rather than the hyperbolic interface model. In the load test for bored pile case, determination of soil parameters that is only based in SPT value corelation, needs engineering judgement to obtain optimal prediction result. In determination of soil parameters on the edge of bored pile, parameters modification is needed as a consequence of limitation of bored pile construction in the field. The non linier model which considers the soil model and interface model will give optimation of pile foundation design. <br />