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地震后最怕某地区陷入“孤岛”状态,致使灾区与外界联系的交通线完全中断,救援人员和物资不能在灾后黄金救援时间内抵达“孤岛”地区,救援工作延误导致的人员伤亡数量急剧增加。近年来地震“孤岛”现象发生频率之高,损失之惨重,不仅显示出生命线工程的重要性,而且也暴露出目前关于生命线工程抗震设计领域存在的问题。通过对历次地震“孤岛”现象和抗震设计规范进行剖析,提出在进行生命线工程结构抗震设计时不能单纯考虑结构自身的重要性及灾后修复的难易程度,还需引入生命线重要性修正系数,以提高灾后交通生命线工程应急救援的可靠性,避免灾后“孤岛”现象的再次发生。
After the earthquake, most people are afraid of falling into an “isolated island” state, resulting in the complete interruption of the transportation line connecting the disaster area with the outside world. Rescue workers and supplies can not arrive in the “isolated island” during the post-disaster gold rescue period. The number of casualties increased sharply. In recent years, the frequency of earthquakes and the phenomenon of “isolated island” have been very high and the losses are heavy. This not only shows the importance of the lifeline project, but also reveals the current problems in the seismic design of lifeline engineering. Through analyzing the phenomena of “isolated islands” and seismic design codes of all previous earthquakes, it is suggested that the importance of the structure itself and the ease of disaster recovery can not be considered in the seismic design of the lifeline engineering structure. The importance correction coefficient In order to improve the reliability of emergency rescue in the lifeline of the traffic post-disaster and to avoid the recurrence of the phenomenon of “isolated island” after the disaster.