应用ANSYS/LS-DYNA进行桥梁拆除方案优化研究
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摘要
西安门大桥爆破拆除工程是在两侧新桥建成的基础上,对旧桥进行爆破拆除,由于两桥最近距离仅1.1 m,旧桥塌落振动可能对新桥产生不利影响,因此需对旧桥的爆破拆除方案进行深入分析,以确保新桥的安全。采用ANSYS/LS-DYNA动力有限元软件,建立新桥、旧桥以及河道的三维数值模型,根据初步爆破方案,模拟了旧桥从起爆到触地的全过程,并优化起爆时间和起爆顺序,将相邻桥墩起爆时间间隔由880 ms改为200 ms,桥墩两侧拱片起爆时间间隔为100 ms。对河道蓄水和无水,以及桥墩爆破和不爆破的方案进行模拟计算,提出降低水位以减小涌浪影响,同时旧桥桥面进行预处理,增大新桥墩与旧桥距离的爆破方案,从而降低新桥桥墩损伤的风险。结果表明:优化后的方案使大桥成功爆破,模拟结果与实际塌落过程与爆堆形态总体吻合。
The blasting demolition of Xi′anmen Bridge would be taken on the basis of the completion of the new bridges on both sides.Since the closest distance between the two bridges is only 1.1 m,the collapse vibration of the old bridge may affect the new bridge.In order to ensure the new bridge′s security,the blasting demolition plan of the old bridge needed to be further analyzed.The 3 D model of new bridges,old bridges,and river courses was established with ANSYS/LS-DYNA.According to the preliminary blasting plan,the entire process from detonation to ground contact was simulated,and the initiation time and sequence were optimized.The detonation time delay between adjacent bridge piers was changed from 880 ms to 200 ms,and the time delay between the detonation of the arches on both sides of the pier was 100 ms.The schemes of water storage and no water in the river,bridge pier blasting and no blasting are simulated.The measures that the water level was lowered to reduce the impact of the surge and the bridge deck of the old bridge was pretreated to increase the distance between the new bridge pier and the old bridge,so as to reduce the risk of damage to the new bridge pier.The results show that the optimized scheme results in the successful blasting of the bridge.And the simulation analysis results are basically consistent with the actual collapse process of the old bridge and the blasting pile range.
The blasting demolition of Xi′anmen Bridge would be taken on the basis of the completion of the new bridges on both sides.Since the closest distance between the two bridges is only 1.1 m,the collapse vibration of the old bridge may affect the new bridge.In order to ensure the new bridge′s security,the blasting demolition plan of the old bridge needed to be further analyzed.The 3 D model of new bridges,old bridges,and river courses was established with ANSYS/LS-DYNA.According to the preliminary blasting plan,the entire process from detonation to ground contact was simulated,and the initiation time and sequence were optimized.The detonation time delay between adjacent bridge piers was changed from 880 ms to 200 ms,and the time delay between the detonation of the arches on both sides of the pier was 100 ms.The schemes of water storage and no water in the river,bridge pier blasting and no blasting are simulated.The measures that the water level was lowered to reduce the impact of the surge and the bridge deck of the old bridge was pretreated to increase the distance between the new bridge pier and the old bridge,so as to reduce the risk of damage to the new bridge pier.The results show that the optimized scheme results in the successful blasting of the bridge.And the simulation analysis results are basically consistent with the actual collapse process of the old bridge and the blasting pile range.
引文
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[10] Livermore Software Technology Corporation.LS-DYNA Keyword User′s Manual.Version R9.0[M].Livermore Software Technology Corporation,2016.
[11] XU Xiao-bing,WANG Jin-tao,WEI Jin-xiao,et al.A forensic investigation of the Taihe arch bridge collapse[J].Engineering Structures,2018,176:881-891.
[2] 高波,胡清和,施园园.浅谈桥梁拆除技术[J].工程与建设,2017,31(5):683-685.[2] GAO Bo,HU Qing-he,SHI Yuan-yuan.Talking about bridge demolition technology[J].Engineering and Construction,2017,31(5):683-685.(in Chinese)
[3] 谢先启,贾永胜,姚颖康,等.复杂环境下城市超长高架桥精细爆破拆除关键技术研究[J].中国工程科学,2014,16(11):65-71,77.[3] XIE Xian-qi,JIA Yong-sheng,YAO Ying-kang,et al.Key technologies of precision demolition blasting of ultra-long urban viaduct in complicated surroundings[J].Engineering Sciences,2014,16(11):65-71,77.(in Chinese)
[4] GB 6722—2014 爆破安全规程[S].北京:中国标准出版社,2014.[4] GB 6722—2014 Safety regulations for blasting[S].Beijing:Standards Press of China,2014.(in Chinese)
[5] 贾海鹏.有限元分析法在桥梁拆除爆破中的应用[D].包头:内蒙古科技大学,2014.[5] JIA Hai-peng,Finite element analysis in bridge demolition blasting application[D].Baotou:Inner Mongolia university of science & technology,2014.(in Chinese)
[6] 季杉,王桂玲,谢伟平.高架桥爆破坍塌全过程数值模拟与分析[J].爆破,2014,31(4):76-81.[6] JI Shan,WANG Gui-ling,XIE Wei-ping.Key technologies of precision demolition blasting of ultra-long urban viaduct in complicated surroundings[J].Blasting,2014,31(4):76-81.(in Chinese)
[7] 冯剑平.桥梁结构的爆破拆除数值模拟优化研究[D].西安:长安大学,2016.[7] FENG Jian-ping.Numerical simulation study and optimization of bridge structure in blasting demolition[D].Xian:Chang′an University,2016.(in Chinese)
[8] 冯剑平,李志利.爆破技术与数值模拟在桥梁拆除中的应用[J].现代交通技术,2013,10(5):38-42.[8] FENG Jian-ping,LI Zhi-li.Application of blasting technique and numerical simulation in bridge demolition[J].Modern Transportation Technology,2013,10(5):38-42.(in Chinese)
[9] 池恩安.公路桥梁组合拆除爆破及数值模拟[D].武汉:武汉理工大学,2011.[9] CHI En-an.Numerical simulation and application of highway bridge demolition blasting[D].Wuhan: Wuhan University of Technology,2011.(in Chinese)
[10] Livermore Software Technology Corporation.LS-DYNA Keyword User′s Manual.Version R9.0[M].Livermore Software Technology Corporation,2016.
[11] XU Xiao-bing,WANG Jin-tao,WEI Jin-xiao,et al.A forensic investigation of the Taihe arch bridge collapse[J].Engineering Structures,2018,176:881-891.