【摘要】 为研究爆炸荷载作用下斜拉桥斜拉索的动力响应,基于爆炸基本理论,开展近爆作用下斜拉索的抗爆性能分析,对斜拉索应力和损伤进行分析,进一步就不同比例距离展开参数化分析。研究结果表明:近场爆炸荷载下,斜拉索不会出现断裂,其破坏形式表现为应力超过屈服应力带来的失效;斜拉索最薄弱的位置是索梁锚固区,该区域斜拉索的应力由于爆炸冲击波的反射大于靠近爆点的斜拉索;给出了保持斜拉索不失效的安全比例距离为0.287 m/kg^1/3,可认为大于该临界比例距离时,斜拉索不会发生失效。更多还原

【Abstract】 In order to study dynamic response of a stay cable of cable-stayed bridges under blast loading, based on the basic blast theory, the anti-explosion performance of the cable under near field blast loading was analyzed.Stress and damage of the cable were analyzed, and further the parametric analyses for different scaled distances were performed.Results showed that under near field blast load, fracture does not appear on the cable, and its failure mode presents a failure caused by its stress exceeding yield one;its weakest position is the cable-girder anchorage zone where the stress of the cable is larger than that of the cable near explosion point due to reflection of blast wave; the safe scaled distance to keep the cable from failure is 0.287 m/kg^1/3,if the scaled distance is larger than this critical scaled distance, the cable can’t fail.更多还原