摘要
支座不均匀沉降对大跨度空间网格结构的静力性能和稳定性具有不可忽视的影响。在此基础上,为研究支座不均匀沉降对双层网壳冗余度和杆件敏感性程度的影响,依据存在支座不均匀沉降的实际工程,采用 ANSYS 建立双层球面网壳模型,分析了支座沉降位置和沉降量对杆件敏感性指标的影响,结果表明支座不均匀沉降会增大结构构件的敏感性指标,且影响高敏感性杆件的分布,对结构的冗余度存在不利影响。最后,采用 ANSYS/LS-DYNA 对支座沉降导致的双层网壳连续性倒塌过程进行模拟,探究双层网壳的倒塌模式,验证了双层网壳具有较高的冗余度。
The influence of uneven settlements of supports on the static performance and stability of large-span spatial structures cannot be ignored.In order to further study the influence of uneven settlements of double-layer latticed shells of supports on the redundancy and the sensitivity of members,a double-layer spherical latticed shell model was established using ANSYS on the basis of a practical project with uneven settlements of supports.Then the influence of different settlement positions and degrees on the sensitivity indexes of members was analyzed.The results indicated that the uneven settlements of supports increased the sensitivity indexes of members,and affect the distribution of high sensitivity members,which had an adverse effect on the redundancy of the shell.Finally,LS-DYNA was used to simulate the progressive collapse process of a double-layer latticed shell caused by support settlements.The collapse mode of the double-layer latticed shell was investigated,and the high redundancy of double-layer latticed shells was verified.
作者
浦沪军
PU Hujun(Fujian Academy of Building Research Co.,Ltd.,Fuzhou Fujian 350108,China;Fujian Key Laboratory of Green Building Technology,Fuzhou Fujian 350108,China)
出处
《工程质量》
2020年第7期44-49,共6页
Construction Quality
关键词
双层球面网壳
支座不均匀沉降
构件敏感性
连续性倒塌
double-layer spherical latticed shell
uneven support settlements
sensitivity of members
progressive collapse
