本文選題：網殼 + 沖擊荷載��； 參考：《東北大學》2010年碩士論文

【摘要】：網殼結構由于造型美觀、受力合理、能覆蓋較大空間等優(yōu)點,越來越被廣泛應用于各種展覽廳、候車(機)廳、體育場館和標志性特種結構等人員活動集中的建筑之中,由此引發(fā)的安全問題越來越受到關注,尤其是9.11恐怖襲擊之后,對空間網殼結構進行偶然或突發(fā)沖擊荷載作用下的分析具有較為深遠的意義。同時,由于我國為地震多發(fā)國家,近年的汶川地震、玉樹地震等都造成了很大的損失,因此有關空間結構的抗震和減振控制問題就更顯突出。 本文首先總結了幾種常用的沖擊荷載形式,包括半正弦沖擊荷載、矩形沖擊荷載、鋸齒三角形沖擊荷載、等腰三角形沖擊荷載、梯形沖擊荷載等。分析了沖擊荷載的影響因素：沖擊荷載波形、沖擊荷載幅值和作用時間。 采用有限元分析軟件ANSYS(?),分析沖擊荷載對網殼結構的影響,研究荷載波形、作用時間、以及結構設計參數(shù)的影響。得出以下結論：沖擊波形所包圍的面積越大,網殼結構的反應越強烈；沖擊荷載幅值越大,作用時間越長,結構的反應越大；網殼結構跨度越大,結構的反應也越大；矢跨比越大,結構的反應越�。粺o缺陷網殼結構的反應小于有缺陷網殼結構的反應；結構安全度越高,結構的反應越��；屋面荷載越大,網殼結構的反應越小。 然后本文采用阻尼器替代雙層球面網殼結構中的部分下弦桿件,對網殼結構進行減振控制研究。得出以下結論：(1)阻尼替代桿件減振方法對雙層網殼結構的節(jié)點位移具有較好的控制效果。(2)阻尼桿件剛度對結構控制效果影響較小。不同阻尼系數(shù)的阻尼桿件對結構動力響應的控制效果差別較大。(3)減振控制沒有提高網殼結構的臨界荷載；減振結構的最大節(jié)點位移有較大幅度的降低,減振方法對其整體變形有較好的控制效果；提高了極限荷載,對結構的整體動力性能都有較大提高；通過對網殼結構動力全過程的塑性發(fā)展狀態(tài)分析可知,減振后網殼結構進入塑性狀態(tài)的地震荷載幅值有較大提高。
[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.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2010
【分類號】：TU399

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