考虑损伤因素的单层平面索网静力试验研究

在单层平面索网玻璃幕墙建筑的使用过程中,单层平面索网作为支承结构,不可避免地会受到各种损伤。为了研究损伤因素对单层平面索网结构静力承载性能的影响,针对尺寸为4.85m×4.85m的4×4网格索网结构足尺试验模型,分别引入索与索之间连接节点失效、索预应力损失、索锚固端破坏这三种损伤因素,进行静力加载试验研究。试验结果表明:横索与竖索连接节点失效几乎不影响单层平面索网结构的承载性能;索预应力损失时,节点索网平面外位移变化率不超过15%;锚固端破坏对结构局部影响较大,节点平面外位移变化率介于18%～36%;损伤因素对节点平面外位移的影响大于索力;损伤的影响取决于损伤程度和损伤位置;相同损伤对结构的影响程度随荷载增加而减小。

Experimental study on the single-layer plane cable net with the influence of damages

During the service of single-layer plane cable net supported glass buildings,as the supporting structure the single-layer plane cable net will inevitably be subjected to different types of damages.In order to study the influence of such damages on the static behavior of the single-layer plane cable net,a full-scale model with the dimension of 4.85m×4.85m and 4×4 grids was designed and constructed.Static tests were conducted after introducing three types of damages including failure of connectors between horizontal and vertical cables,cable prestress loss and cable anchorage failure.The results indicate that,failure of connectors between horizontal and vertical cables almost has no influence on the static behavior of the single-layer plane cable net;the change of nodal displacements induced by the cable prestress loss does not exceed 15%;the cable anchorage failure affects the local part of the single-layer plane cable net significantly,and the induced change of nodal displacements is between 18% and 36%;damages have stronger effect on nodal displacements than cable tension forces.The intensity of the influence of damages depends on the damage degree and location,and decreases with the increase of load.The research results provide a sound foundation for establishing the safety evaluating method of in-service single-layer plane cable net structures.