网壳结构在冲击和地震荷载作用下的动力分析

发布时间：2018-05-30 20:24

本文选题：网壳 + 冲击荷载　；参考：《东北大学》2010年硕士论文

【摘要】：网壳结构由于造型美观、受力合理、能覆盖较大空间等优点,越来越被广泛应用于各种展览厅、候车(机)厅、体育场馆和标志性特种结构等人员活动集中的建筑之中,由此引发的安全问题越来越受到关注,尤其是9.11恐怖袭击之后,对空间网壳结构进行偶然或突发冲击荷载作用下的分析具有较为深远的意义。同时,由于我国为地震多发国家,近年的汶川地震、玉树地震等都造成了很大的损失,因此有关空间结构的抗震和减振控制问题就更显突出。本文首先总结了几种常用的冲击荷载形式,包括半正弦冲击荷载、矩形冲击荷载、锯齿三角形冲击荷载、等腰三角形冲击荷载、梯形冲击荷载等。分析了冲击荷载的影响因素：冲击荷载波形、冲击荷载幅值和作用时间。采用有限元分析软件ANSYS(?),分析冲击荷载对网壳结构的影响,研究荷载波形、作用时间、以及结构设计参数的影响。得出以下结论：冲击波形所包围的面积越大,网壳结构的反应越强烈；冲击荷载幅值越大,作用时间越长,结构的反应越大；网壳结构跨度越大,结构的反应也越大；矢跨比越大,结构的反应越小；无缺陷网壳结构的反应小于有缺陷网壳结构的反应；结构安全度越高,结构的反应越小；屋面荷载越大,网壳结构的反应越小。然后本文采用阻尼器替代双层球面网壳结构中的部分下弦杆件,对网壳结构进行减振控制研究。得出以下结论：(1)阻尼替代杆件减振方法对双层网壳结构的节点位移具有较好的控制效果。(2)阻尼杆件刚度对结构控制效果影响较小。不同阻尼系数的阻尼杆件对结构动力响应的控制效果差别较大。(3)减振控制没有提高网壳结构的临界荷载；减振结构的最大节点位移有较大幅度的降低,减振方法对其整体变形有较好的控制效果；提高了极限荷载,对结构的整体动力性能都有较大提高；通过对网壳结构动力全过程的塑性发展状态分析可知,减振后网壳结构进入塑性状态的地震荷载幅值有较大提高。
[Abstract]:The reticulated shell structure is more and more widely used in all kinds of exhibition halls, waiting halls, stadiums and iconic special structures, because of its beautiful shape, reasonable force and the advantages of covering large space, etc. More and more attention has been paid to the security problems, especially after the 9 / 11 terrorist attack, the analysis of space latticed shell structure under accidental or sudden impact load has a profound significance. At the same time, as China is an earthquake-prone country, the Wenchuan earthquake and the Yushu earthquake in recent years have caused great losses. In this paper, several common impact loads are summarized, including semi-sinusoidal impact load, rectangular impact load, sawtooth triangular impact load, isosceles triangular impact load, trapezoidal impact load and so on. The influencing factors of impact load are analyzed, such as the wave of impact load, the amplitude of impact load and the time of action. The influence of impact load on latticed shell structure is analyzed by means of finite element analysis software ANSYS. The effects of load waveform, action time and structural design parameters are studied. The following conclusions are drawn: the larger the area surrounded by the shock wave, the stronger the response of the reticulated shell structure; the larger the impact load amplitude, the longer the action time, the greater the response of the latticed shell structure, the larger the span of the latticed shell structure, the greater the response of the latticed shell structure. The larger the rise-span ratio, the smaller the response of the structure; the smaller the response of the lattice shell is less than that of the lattice shell with defects; the higher the safety degree of the structure is, the smaller the response of the structure is; the larger the roof load is, the smaller the response of the reticulated shell structure is. Then the dampers are used to replace some lower chord bars in the double layer spherical latticed shell structure, and the vibration control of the latticed shell structure is studied. The following conclusions are drawn: (1) the damping alternative bar damping method has a better control effect on the joint displacement of double-layer latticed shell structure. (2) the stiffness of the damping member has little effect on the control effect of the structure. The control effect of damping member with different damping coefficient on the dynamic response of the structure is quite different. The damping control does not improve the critical load of the reticulated shell structure, and the maximum nodal displacement of the damping structure is greatly reduced. The vibration reduction method has better control effect on the whole deformation, improves the ultimate load and improves the overall dynamic performance of the structure. Through the analysis of the plastic development state of the whole dynamic process of the reticulated shell structure, it is known that, The amplitude of seismic load of reticulated shell structure in plastic state after vibration reduction is greatly improved.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TU399

【参考文献】