摘要
采用LS-DYNA程序建立了单层球面钢网壳的内爆炸数值模拟计算模型.应用所建模型,对单层球面钢网壳在内爆炸作用下的动力响应进行了数值模拟计算,分析讨论了炸药TNT量、矢跨比和爆炸点位置等参数变化对结构动力响应的影响.结果表明,在内爆炸作用下,单层球壳结构的最大位移和最大应力响应随TNT量的增加而增大,最大应力响应的增幅小于最大位移;最大位移和最大应力响应随矢跨比的增大呈非线性减小,矢跨比大、跨度小的结构防(抗)爆炸波的能力较强.数值结果还揭示,邻近结构支座1/4跨度范围内的偏心爆炸对结构最为不利,进行防爆和抗爆设计时,应按偏心爆炸效应选取设计控制参数.
A numerical calculation model for simulating the internal explosions in the single-layer spherical steel re- ticulated shell was established by using LS-DYNA. Based on the model, the numerical simulation and calculation of dynamic responses of the single-layer spherical steel reticulated shell were carried out under internal explosions, and the influences of the TNT equivalence of dynamite, the rise-to-span ratio and the position of explosions on the dy- namic responses of the spherical steel reticulated shell were analyzed and discussed. The results showed that the maximum displacement and stress responses of the single-layer spherical steel reticulated shell under the internal ex- plosions increase with increasing TNT equivalence of dynamite, but the increasing rate of the maximum stress re- sponse is less than that of the maximum displacement response. The maximum displacement and stress responses of the shell decrease nonlinearly with the increase of the rise-to-span ratio, and the bigger the rise-to-span ratio and the smaller the span of the shell, the stronger the capacity of resistance to （anti-）explosive shock waves. The numerical results also revealed that the eccentric explosions within 1/4 span range adjacent to the supports of the shell are the most disadvantageous to the structure, indicating that the design control parameters for explosion-proof and anti- explosion design should be chosen according to eccentric explosion effects.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2015年第B07期102-109,共8页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51278208)
福建省科技计划重大资助项目(2012Y4010)
福建省自然科学基金资助项目(2011J01319)
关键词
钢结构
爆炸
冲击波
动力响应
数值模拟
steel structure
explosion
shock wave
dynamic response
numerical simulation
