摘要
为评价在役装配式桥墩的抗爆性能并建立其安全防护距离,结合已有现浇桥墩及装配式桥墩爆炸试验结果,进行了材料损伤本构、空气和炸药状态方程及接缝分析参数的验证.在分析参数验证的基础上,采用Autodyn冲击分析软件,进行了三种连接方式下装配式桥墩的车致爆炸性能分析.分析结果表明,当爆炸距离小于2 m时,三种装配式桥墩均表现出墩底区域冲剪破坏.爆炸距离大于3 m时,无粘结预应力装配式桥墩及灌浆波纹管装配式桥墩在爆炸冲击波作用下,表现出墩底接缝的有限滑移,部分装配式桥墩表现出典型的弯剪破坏模式.结合桥墩损伤分布、墩底加速度时程、钢筋应力分析结果表明:以不倒塌理念进行三种装配式桥墩抗爆防护时,其安全防护距离均为3 m.
The objective of this study is to estimate the blasting performance and define the safety distances for precast segmental bridge columns(PSBC).The constitutive model of concrete and steel bars,the state equation of air and TNT,and the parameters of joints are validated firstly through the explosion tests of cast-in-place(CIP)column and precast columns.Based on the verified parameters,the blast response of PSBC with different connections was analyzed using Autodyn.The analytical results showed that similar punching shear failure at column base occurs when the distance is less than 2 m.When the blasting distance exceeds 3 m,limited slippage occurs in PSBC connected by unbonded tendons and grouted corrugated ducts.On the contrary,typical bending-shear failure is discovered and negligible slippage is observed in partial precast columns.Combined with damage distribution,acceleration history,and stress of steel bars,the collapse can be avoided when explosive distances exceed 3 m.
作者
朱钊
李源
韩逸涛
ZHU Zhao;LI Yuan;HAN Yi-tao(School of Highway,Chang’an University,Xi’an 710064,China;Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation,Chang’an University,Xi’an 710064,China)
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第9期1337-1348,共12页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金资助项目(51978062)
中央高校基本科研业务费专项资金—长安大学优秀博士学位论文培育资助项目(300203211218).
关键词
桥梁工程
装配式桥墩
车致爆炸
损伤模式
动态响应
安全防护距离
bridge engineering
precast column
vehicle induced explosion
damage mode
dynamic response
safety distance
