近场爆炸作用下比例距离参数对抗爆间室结构可靠度的影响分析  

Influence of Proportional Distance Parameter on Structural Reliability of Blast Resistant Chamber Structure under Explosion

作　　者：李闯[1] 徐自强 王丽娟 时小凡 LI Chuang;XU Ziqiang;WANG Lijuan;SHI Xiaofan(School of Transportatin and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Civil Explosive Station,CCTEG Shenyang Engineering Company,Shenyang,China,110015)

机构地区：[1]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168 [2]中煤科工集团沈阳设计研究院民爆所,辽宁沈阳110015

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第3期478-485,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金青年项目(51808355);中国煤炭科工集团有限公司科技创新创业项目(2019-MS001)。

摘　　要：目的研究爆炸作用下的比例距离参数对墙板结构可靠度影响,提出基于蒙特卡洛取样的墙板结构可靠度分析方法。方法以抗爆间室墙板结构为研究对象,采用LS-DYNA求解器,模拟得到不同比例距离下的结构变形云图;计算墙板结构在爆炸冲击下的位移响应,分别为跨中最大位移与塑性位移;考虑板件材料强度和尺寸的不确定性,以构件延性比为指标建立功能函数,计算爆炸冲击下的墙板结构可靠度。结果当比例距离为0.7m/kg^(1/3)时,板结构的毁伤效应最严重,背爆面出现多条固定端裂缝、环向拉伸裂缝等。随着比例距离的增加,结构的最大位移和塑性位移逐步减小,失效概率不断降低,当比例距离为0.9、0.95、1m/kg^(1/3)时,失效概率趋近于0,得到了不同比例距离下的结构失效概率与可靠指标规律。结论比例距离是影响爆炸作用下墙板结构损伤程度的重要参数,抗爆间室的可靠度研究有助于解决抗爆间室结构设计和性能评价难题。In order to study the influence of proportional distance parameters on the reliability of wallboard structure under explosion,a reliability analysis method of wallboard structure based on Monte Carlo sampling is proposed.Structural deformation nephogram under different scale distance is simulated by using LS-DYNA finite element program.The displacement response of wallboard structure under explosion impact is calculated,which is the maximum displacement and plastic displacement in the middle of span,respectively.Considering the uncertainty of plate material strength and size,a function is established with the ductility ratio as the index to calculate the reliability of wallboard structure under explosion impact.The results show that when the proportional distance is 0.7 m/kg^(1/3),the damage of the concrete slab structure is the most serious,and many cracks appear at the fixed end and circumferential tensile cracks on the blasting surface of the slab back.With the increase of the proportional distance,the maximum displacement and plastic displacement of the structure decrease,and the failure probability gradually decreases.When the proportional distance is 0.9,0.95 and 1 m/kg^(1/3),the failure probability is almost 0.And the failure probability and reliability index curves of the structure under different proportional distances are obtained.Proportional distance is an important parameter affecting the damage degree of wallboard structure under explosion,which is helpful to solve the problems of structural design and performance evaluation.

关 键 词：近场爆炸 抗爆间室 塑性位移 延性比 蒙特卡洛 失效概率 

分 类 号：TU59[建筑科学—建筑技术科学] TN253[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]