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劲性支撑穹顶结构是一种新型的索结构,断索(杆)分析对结构破坏机理和倒塌性能研究有十分重要的意义。运用瞬态动力学的Newmark时间积分法对单根索(杆)断裂后结构的力学性能进行分析,提出了响应变化率和动力响应系数,运用其评价各类索(杆)破断对结构的影响程度。根据局部断索(杆)是否引起其他索杆的强度破坏和过大位移将杆件分为全局敏感性构件、局部敏感性构件和不敏感性构件。提出了一种杆件重要性系数,表征杆件的重要性并对其重要性排序。研究表明:内外环杆、外斜杆和外撑杆破断结构发生连续倒塌,其为全局敏感性构件;外脊索、中脊索、内脊索、中斜杆、内斜杆和内撑杆破断对其附近的构件影响较大,为局部敏感性构件;外环杆的杆件重要性排在首位,内脊索排在末位。
Strong supporting dome structure is a new type of cable structure. The analysis of broken cable (rod) is very important for the study of structural failure mechanism and collapse performance. The Newmark time integral method of transient dynamics was used to analyze the mechanical properties of the structure after the rupture of the single cable (rod). The response rate of change and the dynamic response coefficient were put forward, and the influence of various cable (rod) rupture on the structure was evaluated degree. According to whether the local broken cable (rod) caused the strength of the other cable rod and excessive displacement of the bar will be divided into global sensitive components, local sensitive components and insensitive components. A coefficient of importance of bars is presented, the importance of bars is characterized, and their importance is ranked. The results show that the rupture structures of inner and outer ring bars, outer diagonal bars and outer bars continuously collapse, which is a globally sensitive component. The outer ridges, mid-ridge cables, inner ridges, middle diagonal bars, inner diagonal bars and inner brace bars rupture In the vicinity of the components of a greater impact, as a local sensitive components; outer ring rod member of the importance of the first row, the inner row of the bottom row.