钢筋混凝土雨篷板配筋率及截面尺寸对雨篷抗爆性能的影响
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摘要
钢筋混凝土雨篷由雨篷梁和雨篷板组成,其破环形态主要表现为雨篷板发生断裂破坏.为研究雨篷板对雨篷抗爆性能的影响,利用LS-DYNA软件建立了钢筋混凝土雨篷的标准尺寸有限元模型.在不同爆炸点布置药量W=5kg与W=10kg的TNT炸药,对爆炸荷载作用下雨篷最大位移、梁钢筋应力、混凝土破坏形态3方面进行分析并研究了雨篷板配筋率对雨篷抗爆性能的影响.然后,在药量W=10kg的条件下,保持最大配筋率不变,研究了雨篷板悬挑长度与厚度的改变对雨篷抗爆性能的影响.通过研究发现:雨篷板比雨篷梁破坏更严重.雨篷梁与雨篷板钢筋的最大应力介于静态屈服强度与动态屈服强度之间.增加雨篷板的配筋率对雨篷抗爆性能的提高不明显.减小雨篷板长度、增加雨篷板厚度可以有效地提高雨篷的抗爆性能.
Reinforced concrete awning is composed of awning beam and awning slab and its damage is mainly manifested as the fracture of the slab.A finite element model of standard-size awning is built with the software of LS-DYNA to study how anti-explosion property of the awning is influenced by awning slab.First,the influence of reinforcement ratio of awning slab was analyzed from the maximum displacement of the awning,the reinforcement stresses of the beam,and the failure mode of the concrete under blast load of 5 kg and 10 kg TNT distributed in different detonation points.Then the effect of the overhang length and thickness of awning slab was assessed with 10 kg TNT while the maximum reinforcement ratio remained constant.Based on above mentioned analysis,it is concluded that the awning slab is damaged worse than the awning beam.The maximum stress of the rebar is between static and dynamic yield strength.The anti-explosion property of the awning is effectively strengthened by reducing the length and increasing the thickness of awning slab instead of increasing its reinforcement ratio.
Reinforced concrete awning is composed of awning beam and awning slab and its damage is mainly manifested as the fracture of the slab.A finite element model of standard-size awning is built with the software of LS-DYNA to study how anti-explosion property of the awning is influenced by awning slab.First,the influence of reinforcement ratio of awning slab was analyzed from the maximum displacement of the awning,the reinforcement stresses of the beam,and the failure mode of the concrete under blast load of 5 kg and 10 kg TNT distributed in different detonation points.Then the effect of the overhang length and thickness of awning slab was assessed with 10 kg TNT while the maximum reinforcement ratio remained constant.Based on above mentioned analysis,it is concluded that the awning slab is damaged worse than the awning beam.The maximum stress of the rebar is between static and dynamic yield strength.The anti-explosion property of the awning is effectively strengthened by reducing the length and increasing the thickness of awning slab instead of increasing its reinforcement ratio.
引文
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[3]李猛深,李杰,李宏,等.爆炸荷载下钢筋混凝土梁的变形和破坏[J].爆炸与冲击,2015,35(2):177-183.
[4]向强,刘彤,王汝恒.爆炸荷载作用下钢筋混凝土梁的破坏模式研究[J].长江大学学报(自然科学版),2011,8(7):89-91.
[5]刘成清,何斌,陈弛,等.ANSYS/LS-DYNA工程结构抗震、抗撞击与连续倒塌分析[M].北京:中国建筑工业出版社,2014.
[6]唐长刚.LS-DYNA有限元分析及仿真[M].北京:电子工业出版社,2014.
[7]李忠献,师燕超.建筑结构抗爆分析理论[M].北京:科学出版社,2015
[8]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010:60-66.
[9]汪维,刘瑞朝,吴飚,等.爆炸荷载作用下钢筋混凝土梁毁伤判据研究[J].兵工学报,2016,37(8):1 421-1 429.
[10]BISCHOFF P H,PERRY S H.Compressive behavior of concrete at high stain rate[J].Materials and Structures,1991,24(6):425-450.
[11]MALVAR L.Review of static and dynamic properties of steelreinforcing bars[J].ACI Material Journal,1998,95(5):609-616.
[12]阎石,刘蕾,齐宝欣,等.爆炸荷载作用下钢管混凝土柱的动力响应及破坏机理[J].防灾减灾工程学报,2011,31(5):477-482.