EFISIENSI DAYA DUKUNG TIANG DALAM GRUP MENGGUNAKAN PENDEKATAN ANALISA FEM 3D

Abstract

Diajukan Ratio of the efficiency pile foundation in group occurs due to the influence of overlapping stress distribution. Some formulas for calculating efficiency use the behavior of the end bearing capacity only. Even though there is a friction bearing capacity foundation behavior. Therefore it is necessary to do further research. Research methods if carried out directly actual on site take the costs and time spent are large and the variations tested are few. So we need a more effective method, namely the Finite Element Method 3D (FEM 3D). With FEM 3D the number of variations tested can be more and the time used is also relatively short. FEM 3D was chosen because it has the closest characteristics to the actual one. The results for the efficiency of the FEM 3D show that the behavior of the foundation affects the size of the efficiency value. The efficiency value at full friction is smaller than at the end bearing with a difference of 15% to 25%.. In addition, the longer the depth of the pile, the smaller the efficiency value. In the condition of end bearing capacity, the influence of depth is not too significant, only 1-5%. Meanwhile, in full friction conditions, the effect of depth on the efficiency value can reach 5-10%. In this study, the limit of efficiency values in end bearing conditions is in the range of 0,45-0,9. Meanwhile, for full friction conditions, it ranges from 0,23-0,65.