Seismic Vulnerability on Structural Proportion of Traditional Javanese Wooden Houses (Joglo)

Due to major recent major earthquake, many traditional Joglo buildings have been damaged. In order to preserve Javanese wooden house against earthquake attack, as tangible culture, an evaluation and improvement of timber structures is indispensable. Joglo is the most complicated and sophisticated roof type in terms of the construction and techniques of Javanese wooden houses. The Joglo use teak wood as the primary construction material for both the building's structure and the ornaments. The house is use a knock down construction method, using mortise and tenon. Joglo-style for high-class society e.g., sultan place. The Joglo structure consists core and side structure. In term vertical and horizontal direction, they have different proportion and performance against lateral force. Structural proportion has role with seismic vulnerability. Here, investigation of the structural proportions of Javanese wooden house was carried out associated with earthquake structural damages. It shows the level of vulnerability of Joglo buildings against earthquake attack. A total of 29 Joglo buildings were estimated; the estimation can be used for earthquake mitigation in the future. In this paper, we report the results of investigation and objective to verify the contribution of structural proportion to the damage level of Joglo.