（1 甘肃省土木工程防灾减灾重点实验室， 兰州 730050； 2 西部土木工程防灾减灾教育部工程研究中心， 兰州 730050)

［摘要］为研究单点连续冲击荷载作用下单层球面网壳结构的失效模式，应用通用有限元软件ANSYS LS-DYNA建立了40m跨度，四种不同矢跨比的K8型单层球面网壳结构有限元模型。通过分析单层球面网壳结构在单点连续冲击荷载作用下失效全过程的冲击荷载、能量转化和杆件变形特点，总结归纳出单层球面网壳结构在单点连续冲击荷载作用下的五种失效模式：网壳局部凹陷、网壳局部凹陷时杆件剪切破坏、网壳整体塌陷、网壳整体塌陷时杆件剪切破坏、杆件剪切破坏。对五种失效模式进行了全过程研究分析，明确了单层球面网壳结构在单点连续冲击全过程中肋杆、环杆、斜杆的破坏形式和能量传递与转化特点。

［关键词］单层球面网壳； 连续冲击荷载； 失效模式； 有限元分析

中图分类号：TU399文献标识码：A文章编号：1002-848X(2021)02-0039-07

Research on failure mode for single-layer spherical reticulated shell structure subjected single-point continuous impact load

WU Chang1,2, HUANG Guiwu1,2, DING Jinwei1,2

(1 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou 730050, China; 2 Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou 730050, China)

Abstract:Using the general finite element software ANSYS LS-DYNA established the finite element models of K8 single-layer spherical reticulated shell structure with 40m span and four different rise-span ratios to study the failure modes of single-layer spherical reticulated shell structure under single-point continuous impact load. By analyzing the impact load, energy conversion and element deformation characteristics of the single-layer spherical reticulated shell structure under the single-point continuous impact load, the five failure modes of single-layer spherical reticulated shell structure were summarized: partial depression of the reticulated shell, shear failure of the elements when the reticulated shell are partially depressed, reticulated shell overall collapse, shear failure of elements when reticulated shell overall collapse, shear failure of the elements. The five failure modes were studied and analyzed in the whole process, and the destruction form, energy transfer and transformation characteristics of ribs, ring rods, and inclined rods of the single-layer spherical reticulated shell structure during the whole process of single-point continuous impact were clarified.

Keywords:single-layer spherical reticulated shell; continuous impact load; failure mode; finite element analysis

*国家自然科学基金项目资助（51608245）。

作者简介：吴长，博士，副教授，硕士生导师，Email:280863504@qq.com； 通信作者：黄贵武，硕士研究生，Email: 1483603778@qq.com。