减少框架爆破拆除后坐的措施(2)

根据"框架和排架爆破拆除后坐(1)",列举了14项爆破拆除工程,证实了文中所述后坐机制正确,计算方法可用.由此研究了减少框架爆破拆除的后坐措施,即:现浇钢筋混凝土框架,可采用炸断后跨梁端原地坍塌以防后坐,全炸下层柱原地坍塌,逐跨断裂降低前中跨的重心,横向倾倒改纵向倾倒,中柱仅炸底层,下向切口结合后方结构抵抗后坐,适当降低切口高度和延长逐跨断裂起爆时差等措施,均可减小后坐;框剪结构保留横向纵向剪力墙,以维持抗弯抗压的支撑后立柱,迫使结构单向倾倒而防止机构后坐;多跨现浇框架也可保留后2排柱的下部支撑结构,以支撑上部结构而减少下坐和机构后坐.

Measures for Reducing Backward Action in Explosive Demolition of Frame Structure(2)

According to the document Back sitting of frame and frame bent by explosive demolition(1),we put forward some measures to reduce backward collapes in explosive demolition of frame structure.For in situ reinforce concrete frame,the way are collapse in place with back girder's end broken,collapse in place with all lower pillar broken,falling the c.g.of front and middle span with broken span by span,changing transverse collapse to lengthways collapse,only broken first floor in middle pillar,downward cutting an...