Strategy for Earthquake Disaster Preparedness Design Based on Structural Assesment and Geohazard Vulnerability Map Pundong and Imogiri in Bantul,Yogyakarta, Indonesia as Study Areas

Abstract eng:
This paper presents the relation of the earth condition as well the seismic risk of the area in the rural planning, especially in building structural principles. The field study was conducted in the area influenced by the Yogyakarta earthquake, May 2006. Based on the level of the vulnerability in Bantul District, the more detail mitigation consisting of assessments on structural damages of buildings and the survey on geological conditions of the areas were conducted, specifically in Soronanggan-Watu-Gedong three-subvillage cluster, Pundong Subdistrict and in Karangasem subvillage in Imogiri Subdistrict. Regarding the structural assessments, it is learned that the chronology of the collapsed building in the studied areas were usually started from the frame structure located just below the roof (usually because of the inexistence of supporting elements, such as ring balk) so that all the weight of all elements of roof become the burden to the elements under the roof. The geological survey result shows that Imogiri and Pundong Subdistrict have different soil characteristics. Imogiri area is covered by soil (regosol) with various thickness up to more than 2 m thick. Based on field observation and samples that have been taken, soil in this area can be differentiated into two groups (USC-ASTM, 1983), which are silt/clay (in the north part of the area) and silty sand (in the south part of the area), with the content of sand is about maximum 48%. While in Pundong area, the soil classification varies from silt size soil to silt sand with the content of sand reaches 79%. This means that Pundong area has more loose characteristics of soil rather than Imogiri, therefore, the area is more susceptible for the settlement. However, since the high demand of the land occupancy for the settlements, as structural recommendations, the use of light materials is strongly suggested in order to anticipate the bearing capacity of the soil which is considered low. Then, the use of close structure is also recommended to maintain the building rigidity.

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