FLEXIBLE PAVEMENT STRUCTURAL ANALYSIS BASED ON FINITE ELEMENT METHOD USING DEFPAV COMPUTER PROGRAM

• Main Author: Suangga, Made
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2857
• Institution: Institut Teknologi Bandung

Flexible Pavement Structural Analysis Based On Finite Element Method Using DEFPAV Computer Program, Made Suangga, 1995, Program Magister Sistem dan Teknik Jalan Raya, Program Pasca Sarjana Institut Teknologi Bandung. The finite element method, has become the powerful tool to analyze stress, strain, and deflection in the flexible pavement structures. One of the programs which is based on the finite element method is The DEFPAV computer program. This program is capable of analysing stress, deflection and permanent strains in flexible pavement structures. In order to have a better understanding about the program, the assessment of the DEFPAV computer program is made. Validation of this program has been carried out to solve a specific problem, which has also been analyzed by using an existing method,. and the comparison was made. In the stress comparison with BISAR and SAP-90 computer program at the center of the element, the original DEFPAV computer program have almost equal results, but in the surface deflection comparison with SAP-90 Computer program and DAMA computer program, the result of the original program is smaller than those from SAP-90 and DAMA computer program. The differences with SAP-90 results are 31% smaller in a two-layered system, 34 % smaller in a three-layered system, and 33 % smaller in a four-layered system. The differences with maximum deflections from the DAMA computer program are 48 % smaller in a two-layered system, 49 To smaller in a three-layered system, and 51 % smaller in a four-layered system.. With a better understanding about the program, modification has been made for a certain purposes that is strains calculation and to determine the critical strain under dual-wheel load. The improvement has been made to increase the capability of the program. The results of the modified DEFPAV computer program is also compared with the existing program, such as the BISAR computer program, the DAMA computer program and the SAP-90 computer program. By increasing the cycle of iterations and number of elements, the deflection at the surface will increase and the difference in the surface deflection from the SAP-90 computer program and the DAMA computer program can be reduced. By increasing number of iterations up to 5 (five) times, the differences in surface deflection with SAP-90 results are 0.3 % higher in a three-layered system, and 0.4 % higher in a four- layered system. By increasing the number of elements used, the difference in surface deflection with the DAMA computer program result are 6.6 % higher in a three-layered system and 2.7 % higher in a four-layered system. In the strains calculation, the results from Modified DEFPAV computer program are satisfactory when compared with those from the BISAR computer program, but the difference increases with depth. In critical strains response under dual-wheel load, the results of the Modified DEFPAV computer program is lower than those from the BISAR and the DAMA computer progra