单层球面钢网壳结构在内爆炸作用下的动力响应  被引量:7

Dynamic Responses of Single-Layer Spherical Steel Reticulated Shell Under Internal Explosions

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作  者:高轩能[1] 李超[1] 江媛[1] 

机构地区:[1]华侨大学土木工程学院,厦门361021

出  处:《天津大学学报(自然科学与工程技术版)》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)

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.

关 键 词:钢结构 爆炸 冲击波 动力响应 数值模拟 

分 类 号:O383.2[理学—流体力学] TU393.3[理学—力学]

 

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