ANALYSIS OF BRIDGE PIER RETROFITTED BY JACKETING METHOD CONSIDERING THE INITIAL LOAD AND INTERFACE SLIP

• Main Author: Dixon Octora, Daniel
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/36069
• Institution: Institut Teknologi Bandung

In many design practices, assumptions that are used in retrofitting concrete structural elements often ignore the condition of initial load and an interface slip on the contact surfaces between the old-new concrete material. The concrete structural elements which are loaded by the existing load (gravity) causing initial strain on the existing cross-section before reinforcement is applied, while the interface slip is described as a condition where fully compoiste does not occur. This research will study the two parameters mentioned above in the non-linear analysis of concrete cross-sections retrofitted by concrete jacketing method. The parameters of the loaded structural elements or initial load is obtained by performing non-linear static analysis on the existing structure to obtain the initial moment which value is used as the initial point, while the interface slip parameter is calculated in a simple method using slip coefficient, in which the value is the same along the interconnected elements with a variation of the coefficient of 0 - 1. The non-linear analysis of concrete cross-section was performed by developing a computer package program created in MATLAB language code with a fiber section approach to obtain the moment-curvature relationship which will be used as an input model in inelastic property of retrofitted structural elements. Comparison of the results of the programs that have been compiled will be carried out in conditions wherein the initial load approach is calculated with the monolithic approach and the study of interface slip effect on the capacity of retrofitted structural elements. The object of this research is applied on Cisomang Bridge were located on Cipularang Highway, in which on 2016, the pier of this bridge was cracked because of the foundation shift caused by the accumulation of soil movement of the Cisomang river. The results showed that initial load parameters did not significantly affect cross-sectional capacity when compared with the monolithic approach (? 7%), while the slip effect would have a significant effect on cross-sectional capacity with a slip coefficient <0.5. The performance evaluation of bridge also gives the same results which is operational if the inelastic property of the retrofitted pier element takes into account the initial load parameter compare with the monolithic approach.