摘要
对4组8块钢筋混凝土板进行抗爆性能试验,研究钢筋类型、配筋率、爆炸荷载峰值等因素对破坏形态、跨中位移、加速度及钢筋应变影响。结果表明,用导爆索代替炸药可获得典型的爆炸冲击波荷载,并能施加预定的均布荷载作用。与普通钢筋混凝土板相比,高强钢筋混凝土板裂缝宽度减小、分布均匀,具有良好的抗爆性能。提高配筋率可明显减小高强钢筋混凝土板位移,配筋率为0.78%时较0.62%时位移减小64.02%;配筋率大于0.62%时加速度时程曲线较一致,高强钢筋混凝土板整体刚度较好;随配筋率增大,钢筋应变峰值、残余应变均明显减小。爆炸荷载峰值对高强钢筋混凝土板的动态响应有显著影响,当荷载峰值由0.0318 MPa增大到0.0945 MPa时,位移峰值、残余位移分别增大3.63倍、4.80倍,加速度峰值增大近3倍。
The blast-resistant capacities of 8 concrete slabs with high-strength reinforcements divided into 4 groups under blast loading were studied with tests. The effects of reinforcement types, reinforcement ratios, and peak values of blast loading etc on their failure configurations, span center＇s displacement and acceleration, and strains of reinforcements were investigated. The test results showed that the typical blast loading can be derived by substituting detonating cords for explosive charges, and the predetermined uniform blast loading can be applied on the slabs; compared with common reinforced concrete slabs, the crack widths of the concrete slabs with high-strength reinforcements decrease and become uniform, they have good blast-resistant capacities; the displacements of concrete slabs with high-strength reinforcements can be reduced greatly by increasing reinforcement ratios, the displacements with reinforcement ratio of 0.78% decrease by 64.02% compared with those using reinforcement ratio of 0. 62% ; the time-history curves of accelerations are consistent each other when reinforcement ratios are greater than 0.62% ; there are good global rigidities for concrete slabs with high-strength reinforcements; both peak values of strains and residual strains of high-strength reinforcements decrease with increase in reinforcement ratios ; the peak values of blast loading have obvious influences on the dynamic responses of concrete slabs with high-strength reinforcements; the peak values of displacements and the residual displacements incrase by 3.63 times and 4.80 times, respectively when the peak values of blast loading increase from 0.0318 MPa to 0. 0945 MPa, and the peak values of accelerations increase by nearly 3 times.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第10期135-141,共7页
Journal of Vibration and Shock
基金
国家自然科学基金面上项目(51378498)
江苏省自然科学基金面上项目(BK20141066)
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金(SKLGDUEK1208)
国家创新研究群体科学基金项目(51321064)
关键词
爆炸荷载
高强钢筋
钢筋混凝土板
试验研究
动力响应
blast loading
high-strength reinforcement
reinforced concrete （ RC ） slab
experimental study
dynamic response
