| 考虑杆件初弯曲的单层球面网壳稳定性能 |
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| 引用本文： | 范峰,严佳川,曹正罡.考虑杆件初弯曲的单层球面网壳稳定性能[J].东南大学学报(自然科学版),2009(Z2). |
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| 作者姓名： | 范峰 严佳川 曹正罡 |
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| 作者单位： | 哈尔滨工业大学土木工程学院; |
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| 摘 要： | 基于通用有限元软件ANSYS及自编的前后处理程序,针对是否考虑杆件初弯曲的单层球面网壳结构进行对比分析.采用随机缺陷模态法进行了考虑杆件初弯曲的2800余例K8型单层球面网壳的弹塑性荷载-位移全过程分析,掌握了弯曲角度、幅值随机变量对网壳稳定性能的影响规律.论证了一致缺陷模态法和特征缺陷模态法计算杆件初弯曲对网壳极限承载力影响的适用性.提出了适用于计算考虑杆件初弯曲影响的网壳极限承载力修正的一致缺陷模态法.采用修正的一致缺陷模态法进行了300余例考虑杆件初弯曲的K8型单层球面网壳的弹塑性全过程分析.结果显示:采用修正的一致缺陷模态法可以计算考虑杆件初弯曲的单层球面网壳极限承载力的最小值.杆件初弯曲能够降低单层球面网壳的极限承载力,并改变其屈曲模态和塑性发展分布.当最大允许初弯曲为杆件长度的1/1 000时,网壳极限承载力最大下降5%以上;当最大允许初弯曲为杆件长度的2/1 000时,网壳极限承载力最大下降10%以上.
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| 关 键 词： | 单层球面网壳 杆件初弯曲 稳定 极限承载力 屈曲模态 |
Stability of single-layer reticulated domes with initial imperfection to members |
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| Fan Feng Yan Jiachuan Cao Zhenggang.Stability of single-layer reticulated domes with initial imperfection to members[J].Journal of Southeast University(Natural Science Edition),2009(Z2). |
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| Authors: | Fan Feng Yan Jiachuan Cao Zhenggang |
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| Institution: | Fan Feng Yan Jiachuan Cao Zhenggang (School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China) |
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| Abstract: | Based on commercial finite element software ANSYS and self-compiled pre-processing and post-processing programs,the stability of single-layer reticulated domes which include and do not include the effect of initial bending of members are compared.Using the random imperfection mode method,more than 2800 geometrically and materially nonlinear analyses for the Kiewitt single-layer reticulated domes which include the effect of initial bending of members are carried out.The law of the influence of random variabl... |
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| Keywords: | single-layer reticulated domes initial bending of members stability ultimate load buckling mode |
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