摘要
为更好的进行城市管廊结构抗爆优化设计,深入研究管廊燃气爆炸动态响应特性极为必要。利用有限元软件ANSYS/LS-DYNA,建立管廊结构的有限元计算模型,采用等效内能法模拟燃气爆炸荷载,研究燃气爆炸激发冲击波传播衰减规律及其对管廊结构的动态响应规律,分析管廊结构破坏和反应特征。结果表明:燃气爆炸冲击波随传播距离的增加,峰值压力逐渐降低,同时超压持续作用时间逐渐变短。冲击波在受限空间壁面的反射叠加造成其峰值压力在传播后期呈现略微增加趋势,但整体上以多项式形式衰减。爆炸损伤部位主要集中在燃气仓墙角或结构突变位置,燃气仓顶部设置泄压口,可有效避免上部通行仓混凝土的损伤破坏效应。管廊结构墙角处刚度较大导致其振动响应程度较弱,而墙面中部区域节点振动合速度可达到0.4 m/s。满仓燃气爆炸工况下,管廊结构局部混凝土产生贯穿裂纹,但并未出现整体结构性损坏。
In order to better optimize the anti-explosion design of urban pipe gallery structure,it is very necessary to study the dynamic response characteristics of gas explosion of pipe gallery.Using the finite element software ANSYS/LS-DYNA,the finite element calculation model of the pipe gallery structure was established,and the equivalent internal energy method was used to simulate the gas explosion loading.Based on this model,the failure and response characteristics of the pipe gallery structure were analyzed by studying the propagation attenuation law of shock wave excited by gas explosion and its dynamic influence on the pipe gallery structure.The results show that the peak pressure of gas explosion shock wave decreases gradually with the increase of propagation distance,and the duration of overpressure becomes shorter at the same time.The reflection and superposition of the shock wave on the wall of confined space cause the peak pressure to increase slightly in the later stage of propagation,but the whole attenuation is in a polynomial form.The explosion damage is mainly concentrated in the corner of the gas warehouse or the position where the structure changes suddenly.The pressure relief port is set on the top of the gas warehouse,which can effectively avoid the damage effect of the concrete in the upper passage warehouse.The higher stiffness of the corner of the pipe gallery leads to a weaker vibration response,while the resultant vibration velocity in the middle of the wall can reach 0.4 m/s.Under the condition of full warehouse gas explosion,the local concrete of pipe gallery structure has through-wall cracks,but there is no overall structural damage.
作者
邓成云
崔海龙
钟冬望
李腾飞
王燕红
何理
司剑峰
DENG Cheng-yun;CUI Hai-long;ZHONG Dong-wang;LI Teng-fei;WANG Yan-hong;HE Li;SI Jian-feng(Capital Engineering&Research Incorporation Limited,Beijing 100176,China;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《爆破》
CSCD
北大核心
2021年第3期159-165,共7页
Blasting
基金
“十三五”国家重点研发计划课题《城市地下综合管廊规划建设与安全运维体》(2016YFC0802405)。
关键词
城市管廊
燃气爆炸
数值模拟
动态响应
爆炸损伤
urban pipe gallery
gas explosion
numerical simulation
dynamic response
explosion damage
