局部索桿失效對肋環(huán)人字型索穹頂結(jié)構(gòu)受力性能的影響
發(fā)布時間:2019-03-13 07:39
【摘要】:肋環(huán)人字型索穹頂是一種突破傳統(tǒng)Fuller思想的新型索穹頂結(jié)構(gòu)。以一跨度90 m的肋環(huán)人字型索穹頂為研究對象,采用向量式有限元方法,模擬脊索松弛和每一類桿件分別破斷失效后結(jié)構(gòu)的內(nèi)力和變位時程響應(yīng),通過定義動內(nèi)力系數(shù)、內(nèi)力變異系數(shù)和觀察結(jié)構(gòu)主要節(jié)點位移來劃分各類桿件的安全等級,判斷部分桿件失效后結(jié)構(gòu)是否倒塌和是否具有承載能力。計算結(jié)果表明,單根桿件的破斷均不會引起結(jié)構(gòu)的整體失效,但結(jié)構(gòu)動力響應(yīng)顯著,部分桿件的最大動內(nèi)力會超過屈服極限。根據(jù)計算結(jié)果分析可知,環(huán)索和脊索的安全等級高于斜索和撐桿,外圈桿件的安全等級高于內(nèi)圈桿件。
[Abstract]:Rib ring herringbone cable dome is a new type of cable dome structure which breaks through the traditional Fuller idea. Taking a ribbed ring domes with a span of 90 m as the object of study, the vector finite element method is used to simulate the internal force and displacement time-history response of the structure after the relaxation of the chordal cable and the failure of each kind of bar respectively, and the dynamic internal force coefficient is defined by the definition of the dynamic internal force coefficient. The coefficient of variation of internal force and the displacement of the main nodes of the structure are observed to divide the safety grade of all kinds of members, and to judge whether the structure collapses or not after some members fail and whether the structure has the bearing capacity or not. The results show that the failure of single member will not cause the overall failure of the structure, but the dynamic response of the structure is remarkable, and the maximum dynamic internal force of some members will exceed the yield limit. According to the analysis of calculation results, the safety grade of ring rope and chordate is higher than that of slant cable and brace, and the safety grade of outer ring member is higher than that of inner ring member.
【作者單位】: 浙江大學(xué)空間結(jié)構(gòu)研究中心;
【分類號】:TU399
[Abstract]:Rib ring herringbone cable dome is a new type of cable dome structure which breaks through the traditional Fuller idea. Taking a ribbed ring domes with a span of 90 m as the object of study, the vector finite element method is used to simulate the internal force and displacement time-history response of the structure after the relaxation of the chordal cable and the failure of each kind of bar respectively, and the dynamic internal force coefficient is defined by the definition of the dynamic internal force coefficient. The coefficient of variation of internal force and the displacement of the main nodes of the structure are observed to divide the safety grade of all kinds of members, and to judge whether the structure collapses or not after some members fail and whether the structure has the bearing capacity or not. The results show that the failure of single member will not cause the overall failure of the structure, but the dynamic response of the structure is remarkable, and the maximum dynamic internal force of some members will exceed the yield limit. According to the analysis of calculation results, the safety grade of ring rope and chordate is higher than that of slant cable and brace, and the safety grade of outer ring member is higher than that of inner ring member.
【作者單位】: 浙江大學(xué)空間結(jié)構(gòu)研究中心;
【分類號】:TU399
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