Reinforcing Method of Plastic-house Frame for Heavy Snow using Pretension Tie
A greater number of plastic-house collapses in rural area are being recorded due to unexpectedly heavy amounts of snowfall during winter seasons in Korea. However,studies on prevention of plastic-house collapses have been infrequent and our farming communities continue to bear witness to such damage year after year. The structural shape of plastic-houses seems to be arch system. In actuality, the structure behaves not as an ach system, but rather as a frame system. This is because the curved top elements (beam) and the vertical elements (columns) of the structure are composed discontinuously. This system is very weak and unable to withstand heavy vertical loads because external load is resisted by the internal moment rather than internal axial force. To this end, this study proposes a new plastic-house reinforcement method that involves temporary installation of ties at arch-to-column joints during heavy snow accumulation. The ties transform the plastic-house frames structural behavior from that of a frame to that of an arch. This arch action is made further effective by applying pretension force to the ties, giving the entire plastic-house a very stronger frame during heavy snowfalls. The resistance rations using combined strength equation with a tie might be much higher than the normal cases without tie depending on the pretension force of tie. This study suggests the most effective ratio of pretension force to be applied.
Plastic-house pretension tie snow load
Bo-Kyung Kim Swoo-Heon Lee Kyung-Jae Shin
Graduate Student,Department of Architectural Engineering,Kyungpook National University Professor,Department of Architectural Engineering,Kyungpook National University
国际会议
北京
英文
876-879
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）