Study On Methods Of Strengthening Existing Primary And Secondary Schools

In the Wenchuan earthquake, because earthquake resistance ability is insufficient, many school constructions collapse, and many students were injured and died. Improve the seismic capacity of existing school building is the most effective measures for disaster mitigation. Practice has proved that after a seismic evaluation and strengthening of building before the quake, the extent of the damage in the earthquake much lighter than unreinforced buildings. In April2009, the state official launch of the National primary and secondary school premises security engineering. In the national primary and secondary schools to carry out seismic strengthening.In order to improve the overall disaster prevention capacity building, and to let the school building achieve key fortification class earthquake resistance fortification standard.Existing primary and secondary schools buildings includesclassroom building, student's dormitory, cafeteria, auditorium, and so on. According to the type of structure,it can be divided into masonry structures and reinforced concrete frame structure. In the early days, schools in China are mainly brick or brick-wood structure. with the development of China's economy, structure of reinforced concrete school build more and more. Seismic evaluation and strengthening of primary and secondary schools is characterized by large age span, identification reinforced structure complex, labor-intensive, task immediately. In order to further strengthen the technical guidance work which the Yunnan Province elementary and middle schools school building safety engineering earthquake resistance appraises and reinforces, This article base on 《Standard for seismic appraisal of buildings》 GB50023—2009,《Technical specification for seismic strengthening of buildings》 JGJ116—2009and existing related specifications, procedures, according to continuous seismic working life difference, the author summarize and sort the seismic appraisal method of masonry school buildings and reinforced concrete school buildings,recount Commonly used and mature technology of reinforcement for primary and secondary schools, the authors hope that can play a reference role in guiding reinforcement work on the identification of primary and secondary schools. Through engineering examples for field testing, the project instance of two identification methods for seismic evaluation, using PKPM software computation compound seismic capability index, combining deformation calculation for the role of frequent earthquake and rare earthquake, using extension supporting reinforce single span frames, and through PKPM software computation supporting capacity, do strengthening design. According on 《Price information in Yunnan Province》 computation reinforcement cost expense, comparison and analysis of the reinforcement costs after Identification of reinforcement in the different of continuous seismic service life.