考虑节点域轴向滑移刚度的K6型单层球面木网壳稳定性分析  

Stability Analysis of K6-Type Single-Layer Spherical Timber Reticulated Shell Considering Joint Axial Slip Stiffness

作　　者：孙小鸾[1] 瞿以恒 陆伟东[1] SUN Xiaoluan;QU Yiheng;LU Weidong(Department of Structural Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学建筑工程系,南京210009

出　　处：《结构工程师》2021年第6期1-9,共9页Structural Engineers

基　　金：国家重点研发计划(2017YFC0703506)。

摘　　要：利用ANSYS软件中的Combin39非线性弹簧单元模拟木网壳节点域的各向连接,建立K6型单层球面木网壳模型,开展全过程稳定性分析,分析节点域轴向滑移刚度对网壳整体稳定性的影响。结果表明:考虑节点轴向滑移变形易造成网壳整体竖向刚度下降,部分木杆件由轴向受力转化为弯屈受力为主,最终影响到网壳的破坏模式及极限承载力;节点处杆端与钢榖间存在的间隙,造成钢榖无法限制节点的受力滑移,使节点轴向滑移刚度对网壳整体性能的不利影响充分发挥;节点轴向滑移刚度对网壳性能的影响程度随着网壳跨度的增加呈微弱的增长趋势;节点刚度对不同矢跨比网壳的影响并非线性关系,存在最不利矢跨比情况;随着网壳分频数的增加,造成节点数量增加,从而加大了节点轴向滑移刚度对网壳的影响程度。Based on the typical bolted joint with steel plate in spherical timber reticulated shell,a K6-type single-layer spherical timber reticulated shell is established using the finite element software ANSYS,and the joint axial slip stiffness is simulated by using the Combin39 nonlinear spring element.A whole process stability analysis is carried out to study the influence of joint axial slip stiffness on the bearing capacity.The results show that the axial compression deformation of the joint tends to cause a decrease in the overall vertical stiffness of the reticulated shell,resulting in the transformation of the stress state of some members from axial stress to bending stress,which eventually affect the failure mode and ultimate bearing capacity of the shell;the joint axial slip stiffness decreases easily due to the gap existing between rod ends,which has an adverse effect on the bearing capacity of the reticulated shell;with the increase of the reticulated shell span,the influence degree of the joint axial stiffness shows a weak increasing trend;the influence of joint stiffness on the reticulated shells with different rise span ratios is nonlinear,with the existence of the most unfavorable span ratio;in the wood lattice shell with more frequency division,it causes the number of joints to increase,thus increasing the influence degree of the joint axial slip stiffness.

关 键 词：球面木网壳 轴向滑移刚度 稳定承载力 非线性弹簧单元 

分 类 号：TU399[建筑科学—结构工程]