【摘要】 索穹顶结构是由索和杆为基本构成单元,通过预应力提供刚度的一类新型索杆空间结构体系。为考察结构中局部索(杆)破坏对整体结构的影响,以某体育馆索穹顶结构方案为背景,采用动力学方法模拟了各类杆件破断后其他杆件内力的变化和结构最终到达的平衡位置。通过观察局部索(杆)破坏是否引起其它索松弛从而造成较大节点变位来判断结构体系是否安全,通过观察局部索(杆)破坏是否引起其它索杆的强度破坏来判断结构是否连续倒塌,同时区分了不同位置杆件的安全等级。该研究对于该类结构的正常使用和维护有一定的借鉴意义。更多还原

【Abstract】 A cable dome composed of cables and struts is a new type of cable-strut system whose stiffness is provided by prestress.To investigate the structural behavior after one cable (strut) ruptured,dynamic method was adopted to simulate the process of cable rupture.The change of internal forces of other members and the final equilibrium position of the structure after failure of different members was investigated.The safety of the structure was evaluated by observing if the rupture of local cable caused slack of other cables and large displacement.The ability of anti-continuous collapses of the structure was judged by observing whether the rupture of local cable (strut) caused progressive failure of other members.The safety grade of members in different position was also distinguished.This study would benefit the normal service and maintenance of cable domes.更多还原