中文摘要：

大跨度预应力索杆结构在局部损伤情况下的抗连续倒塌能力引起业内的关注。由于预应力索杆结构存在突变为机构的倒塌模式,在此背景下提出一种具有新型构件拓扑关系的结构形式,称作环形交叉索桁结构。新型构件拓扑关系使得每个节点都具有多条有效的备用荷载传递路径,有利于阻止结构的连续倒塌。采用ANSYS/LS-DYNA中的瞬时移除法,分析环形交叉索桁结构在单根索或杆破断情形下的动力响应。结果表明:环形交叉索桁结构不会发生大范围整体机构性倒塌,机构位移仅限于破断索(杆)附近的较小范围,结构主体仍可保持几何稳定;结构内力重分布现象明显,部分构件的内力超过设计限值,可通过稍微提高某些构件的强度储备防止构件破断的蔓延。

英文摘要：

The progressive collapse resistance of the large-span pre-stressed spatial structures raises wide concerns .A new-type pre-stressed cable-strut structure whose typology is advantageous to resisting progressive collapse , named annular crossed cable-truss structure (ACCTS), was proposed.In aim to prove the progressive collapse resistance of the new-type structure , simulations based on instantaneous component-removing method of ANSYS/LS-DYNA were carried out to analyze the dynamic response under the break of single cable or rod for the new structure .It turned out that the ACCTS did not turn geometrically unstable in all removal conditions .Increasing the strength reserve of some members could be an effective way to prevent the extension of the break of the members .