双曲面网壳半刚性节点试验及弹塑性屈曲分析
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摘要
为研究X形节点刚度对网壳结构弹塑性屈曲性能的影响。本文以广东移动南方基地大型双曲面单层网壳结构为背景,对4组X形节点进行平面内、外的弯曲刚度试验和有限元模拟,得到X形节点各杆件的弯矩–转角曲线,进而计算出节点各杆件的名义转动刚度值。结果表明:支座约束情况对节点转动刚度影响较大;平面外荷载下,节点转动刚度大,可按刚接处理;平面内荷载下,节点半刚性不容忽视。基于试验结果,考虑结构安装缺陷,采用MATRIX27单元对网壳节点刚度进行模拟,得到结构倒塌破坏全过程的荷载–位移特性,并对网壳节点在不同转动刚度下的极限承载力进行了对比分析。结果表明:X形节点转动刚度减小,网壳结构极限承载力降低;安装缺陷增大,网壳稳定性减弱。
In order to study the effects of the stiffness of X-shaped joints on elastic-plastic buckling behaviors of reticulated shell structure,based on a large hyperboloid single-layer reticulated shell structure which is the south base of Guangdong Mobile,4 groups of bending stiffness tests and simulations are carried out. Meantime,moment-rotation curves of members of joints are obtained,and nominal rotational stiffness is calculated. The results show that the constraint conditions of supports have large effect on rotation stiffness of members of joints. Under out-of-plane loading,the rotation stiffness of joints is large and joints can be treated as rigid connections. Under the in-plane loading,joints show typical semi-rigid characteristics. Based on the test results and considering the defect of structural installation, the joint stiffness of reticulated shell structure is simulated by element MATRIX27 and the load-displacement characteristics are obtained in the analysis of structural collapse. The ultimate bearing capacity of the structure with different rotation stiffness of joints is comparatively analyzed. The results show that the smaller the rotation stiffness of the X-shaped joints is,the lower the ultimate bearing capacity of reticulated shell structure is. Meantime,the larger the defect of structural installation is,the weaker the stability of reticulated shell is.
In order to study the effects of the stiffness of X-shaped joints on elastic-plastic buckling behaviors of reticulated shell structure,based on a large hyperboloid single-layer reticulated shell structure which is the south base of Guangdong Mobile,4 groups of bending stiffness tests and simulations are carried out. Meantime,moment-rotation curves of members of joints are obtained,and nominal rotational stiffness is calculated. The results show that the constraint conditions of supports have large effect on rotation stiffness of members of joints. Under out-of-plane loading,the rotation stiffness of joints is large and joints can be treated as rigid connections. Under the in-plane loading,joints show typical semi-rigid characteristics. Based on the test results and considering the defect of structural installation, the joint stiffness of reticulated shell structure is simulated by element MATRIX27 and the load-displacement characteristics are obtained in the analysis of structural collapse. The ultimate bearing capacity of the structure with different rotation stiffness of joints is comparatively analyzed. The results show that the smaller the rotation stiffness of the X-shaped joints is,the lower the ultimate bearing capacity of reticulated shell structure is. Meantime,the larger the defect of structural installation is,the weaker the stability of reticulated shell is.
引文
[1]陈昕.空间网格结构全过程分析及单层鞍形网壳的稳定性[D].哈尔滨:哈尔滨工业大学,1990.
[2]赵才其,朱建坤,赵惠麟.单层球面网壳非线性稳定分析的近似方法[J].工业建筑,1999,29(11):70-72.
[3]唐敢,尹凌峰,马军,等.单层网壳结构稳定性分析的改进随机缺陷法[J].空间结构,2004,10(4):44-47.
[4]陈务军,董石麟,付功义.周围双层中部单层球面网壳的稳定性分析[J].上海交通大学学报,2002,36(3):436-440.
[5]陈务军,付功义,龚景海,等.大矢跨比局部双层球面网壳的形式及稳定性分析[J].空间结构,2002,8(1):19-28.
[6]赵阳,陈贤川,董石麟.大跨椭球面圆形钢拱结构的强度及稳定性分析[J].土木工程学报,2005,38(5):15-23.
[7]范峰.网壳结构弹塑性稳定性[M].北京:科学出版社,2015.
[8]See T,Mcconnel R E.Large displacement elastic buckling of space structures[J].Journal of Structural Engineering,1986,112(5):1052-1069.
[9]Fathelbab F A.The Effect of Joints on the Stability of Shallow Single Layer Lattice Domes[D].Cambridge:University of Cambridge,1987.
[10]Shibata R,Kato S,Yamada S,et al.Experimental Study on the Ultimate Strength of Single-layer Reticular Domes[C]//Space Structures 4.ICE Publishing,1993:387-395.
[11]罗永峰,沈祖炎.网壳结构节点体对其承载性能的影响[J].同济大学学报(自然科学版),1995,23(1):21-25.
[12]王星,董石麟.考虑节点刚度的网壳杆件切线刚度矩阵[J].工程力学,1999,16(4):24-32.
[13]邱国志,赵金城.X型圆钢管相贯节点刚度试验[J].上海交通大学学报,2008,42(6):966-970.
[14]范峰,曹正罡,崔美艳.半刚性节点单层球面网壳的弹塑性稳定性分析[J].哈尔滨工业大学学报,2009,41(4):1-6.
[15]范峰,马会环,张洋,等.碗式半刚性节点网壳弹塑性稳定分析[J].哈尔滨工业大学学报,2010,42(10):1513-1518.
[16]陈昕,沈世钊.网壳结构的几何非线性分析[J].土木工程学报,1990,23(3):47-57.
[17]沈世钊,陈昕.网壳结构稳定性[M].北京:科学出版社,1999.
[18]康菊,宋振森.节点刚度对有缺陷短程线球面网壳稳定性的影响[J].四川建筑科学研究,2008,34(1):42-46.
[19]GB 50009-2012,建筑结构荷载规范[S].
[20]JGJ7-2010,空间网格结构技术规程[S].
[2]赵才其,朱建坤,赵惠麟.单层球面网壳非线性稳定分析的近似方法[J].工业建筑,1999,29(11):70-72.
[3]唐敢,尹凌峰,马军,等.单层网壳结构稳定性分析的改进随机缺陷法[J].空间结构,2004,10(4):44-47.
[4]陈务军,董石麟,付功义.周围双层中部单层球面网壳的稳定性分析[J].上海交通大学学报,2002,36(3):436-440.
[5]陈务军,付功义,龚景海,等.大矢跨比局部双层球面网壳的形式及稳定性分析[J].空间结构,2002,8(1):19-28.
[6]赵阳,陈贤川,董石麟.大跨椭球面圆形钢拱结构的强度及稳定性分析[J].土木工程学报,2005,38(5):15-23.
[7]范峰.网壳结构弹塑性稳定性[M].北京:科学出版社,2015.
[8]See T,Mcconnel R E.Large displacement elastic buckling of space structures[J].Journal of Structural Engineering,1986,112(5):1052-1069.
[9]Fathelbab F A.The Effect of Joints on the Stability of Shallow Single Layer Lattice Domes[D].Cambridge:University of Cambridge,1987.
[10]Shibata R,Kato S,Yamada S,et al.Experimental Study on the Ultimate Strength of Single-layer Reticular Domes[C]//Space Structures 4.ICE Publishing,1993:387-395.
[11]罗永峰,沈祖炎.网壳结构节点体对其承载性能的影响[J].同济大学学报(自然科学版),1995,23(1):21-25.
[12]王星,董石麟.考虑节点刚度的网壳杆件切线刚度矩阵[J].工程力学,1999,16(4):24-32.
[13]邱国志,赵金城.X型圆钢管相贯节点刚度试验[J].上海交通大学学报,2008,42(6):966-970.
[14]范峰,曹正罡,崔美艳.半刚性节点单层球面网壳的弹塑性稳定性分析[J].哈尔滨工业大学学报,2009,41(4):1-6.
[15]范峰,马会环,张洋,等.碗式半刚性节点网壳弹塑性稳定分析[J].哈尔滨工业大学学报,2010,42(10):1513-1518.
[16]陈昕,沈世钊.网壳结构的几何非线性分析[J].土木工程学报,1990,23(3):47-57.
[17]沈世钊,陈昕.网壳结构稳定性[M].北京:科学出版社,1999.
[18]康菊,宋振森.节点刚度对有缺陷短程线球面网壳稳定性的影响[J].四川建筑科学研究,2008,34(1):42-46.
[19]GB 50009-2012,建筑结构荷载规范[S].
[20]JGJ7-2010,空间网格结构技术规程[S].