纵筋疏密程度对相同配筋率RC梁抗爆性能的影响
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摘要
纵筋配筋率相同而疏密程度不同的RC梁抗爆性能存在一定差异.为解决上述问题,提出了反映纵筋疏密程度的参数,定义为"距径比"Φ_(A.)借助于数学工具建立方程并通过计算得到RC梁在不同距径比Φ_A下的工况表.利用数值分析方法研究了不同距径比Φ_A梁的破坏形态与钢筋应力,选择合理的工况确定了提高梁抗爆性能、不同排数n_1时最优纵筋距径比Φ_(A1)的数值.
There are some differences in the anti-explosion performance of RC beams with the same longitudinal reinforcement ratio and different density.To solve such problems,aparameter is proposed to reflect the density of longitudinal reinforcement,which is defined as‘distance-diameter ratio' Φ_A.The equation is established with the aid of the mathematical tool and by calculation the working conditions table of RC beam is obtained with different distance-diameter ratio Φ_(A.).The numerical analysis method has been used to study the failure model and steel bar stress of different distance-diameter ratio Φ_A beams.Reasonable conditions are selected to determine the value of the distance-diameter ratio Φ_(A1) for improving the anti-explosion performance of RC beam and optimal longitudinal bars for n_1 in different number of rows.
There are some differences in the anti-explosion performance of RC beams with the same longitudinal reinforcement ratio and different density.To solve such problems,aparameter is proposed to reflect the density of longitudinal reinforcement,which is defined as‘distance-diameter ratio' Φ_A.The equation is established with the aid of the mathematical tool and by calculation the working conditions table of RC beam is obtained with different distance-diameter ratio Φ_(A.).The numerical analysis method has been used to study the failure model and steel bar stress of different distance-diameter ratio Φ_A beams.Reasonable conditions are selected to determine the value of the distance-diameter ratio Φ_(A1) for improving the anti-explosion performance of RC beam and optimal longitudinal bars for n_1 in different number of rows.
引文
[1]都浩.城市环境中建筑爆炸荷载模拟及钢筋混凝土构件抗爆性能分析[D].天津:天津大学,2008.DU Hao.Simulation of blast loading on building in urban environment and analysis on blast-resistant of RC members[D].Tianjin:Tianjin University,2008.(in Chinese)
[2]李猛深,李杰,李宏,等.爆炸荷载作用下钢筋混凝土梁的变形和破坏[J].爆炸与冲击,2015,35(2):177-183.LI Meng-shen,LI Jie,LI Hong,et al.Deformation and failure of reinforced concrete beams under blast loading[J].Explosion and Shock Wave,2015,35(2):177-183.(in Chinese)
[3]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):1421-1429.WANG Wei,LIU Rui-chao,WU Biao,et al.Damage criteria of reinforced concrete beam under blast loading[J].Acta Armamentarii,2016,37(8):1421-1429.(in Chinese)
[4]GB 50010-2010,混凝土结构设计规范[S].GB 50010-2010,Code for design of concrete structure[S].(in Chinese)
[5]GB 50011-2010,建筑抗震设计规范[S].GB 50011-2010,Code for seismic design building[S].(in Chinese)
[6]BISCHOFF P H,PERRY S H.Compressive behavior of concrete at high strain rates[J].Material and Structure,1991,24(6):425-450.
[7]MALVAR L.Review of static and dynamic properties of steel reinforcing bars[J].ACI Material Journal,1998,95(5):609-616.
[8]李忠献,师燕超,史祥生.爆炸荷载下钢筋混凝土板破坏评定方法[J].建筑结构学报,2009,30(6):60-66.LI Zhong-xian,SHI Yan-chao,SHI Xiang-sheng.Damage analysis and assessment of RC slabs under blast load[J].Journal of Building Strcture,2009,30(6):60-66.(in Chinese)
[9]阎石,刘蕾,齐宝欣,等.爆炸荷载下方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.YAN Shi,LIU Lei,QI Bao-xin,et al.Dynamic response and failure mode of concrete infilled rectangular steel tube column under blasting loading[J].Journal of Disaster Prevention and Mitigation Engineering,2011,31(5):477-482.(in Chinese)
[10]周清,丁杰,刘海员.考虑抗爆要求的“交通核”方案优化分析[J].青岛理工大学学报,2017,38(6):27-34.ZHOU Qing,DING Jie,LIU Hai-yuan.Analysis of“traffic hub”optimal plan considering anti-explosion[J].Journal of Qingdao University of Technology,2017,38(6):27-34.(in Chinese)
[11]师燕超,李忠献,郝洪.爆炸荷载下钢筋混凝土框架结构的连续倒塌分析[J].解放军理工大学学报,2007,8(6):652-658.SHI Yan-chao,LI Zhong-xian,HAO Hong.Numerical analysis of progressive of reinforced concrete frame under blast loading[J].Journal of PLA University of Science and Technology,2007,8(6):652-658.(in Chinese)
[2]李猛深,李杰,李宏,等.爆炸荷载作用下钢筋混凝土梁的变形和破坏[J].爆炸与冲击,2015,35(2):177-183.LI Meng-shen,LI Jie,LI Hong,et al.Deformation and failure of reinforced concrete beams under blast loading[J].Explosion and Shock Wave,2015,35(2):177-183.(in Chinese)
[3]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):1421-1429.WANG Wei,LIU Rui-chao,WU Biao,et al.Damage criteria of reinforced concrete beam under blast loading[J].Acta Armamentarii,2016,37(8):1421-1429.(in Chinese)
[4]GB 50010-2010,混凝土结构设计规范[S].GB 50010-2010,Code for design of concrete structure[S].(in Chinese)
[5]GB 50011-2010,建筑抗震设计规范[S].GB 50011-2010,Code for seismic design building[S].(in Chinese)
[6]BISCHOFF P H,PERRY S H.Compressive behavior of concrete at high strain rates[J].Material and Structure,1991,24(6):425-450.
[7]MALVAR L.Review of static and dynamic properties of steel reinforcing bars[J].ACI Material Journal,1998,95(5):609-616.
[8]李忠献,师燕超,史祥生.爆炸荷载下钢筋混凝土板破坏评定方法[J].建筑结构学报,2009,30(6):60-66.LI Zhong-xian,SHI Yan-chao,SHI Xiang-sheng.Damage analysis and assessment of RC slabs under blast load[J].Journal of Building Strcture,2009,30(6):60-66.(in Chinese)
[9]阎石,刘蕾,齐宝欣,等.爆炸荷载下方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.YAN Shi,LIU Lei,QI Bao-xin,et al.Dynamic response and failure mode of concrete infilled rectangular steel tube column under blasting loading[J].Journal of Disaster Prevention and Mitigation Engineering,2011,31(5):477-482.(in Chinese)
[10]周清,丁杰,刘海员.考虑抗爆要求的“交通核”方案优化分析[J].青岛理工大学学报,2017,38(6):27-34.ZHOU Qing,DING Jie,LIU Hai-yuan.Analysis of“traffic hub”optimal plan considering anti-explosion[J].Journal of Qingdao University of Technology,2017,38(6):27-34.(in Chinese)
[11]师燕超,李忠献,郝洪.爆炸荷载下钢筋混凝土框架结构的连续倒塌分析[J].解放军理工大学学报,2007,8(6):652-658.SHI Yan-chao,LI Zhong-xian,HAO Hong.Numerical analysis of progressive of reinforced concrete frame under blast loading[J].Journal of PLA University of Science and Technology,2007,8(6):652-658.(in Chinese)