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为分析不同节点刚度、矢跨比对单层K6型木网壳结构受力性能的影响,设计了4个跨度为4 m,矢跨比分别为1/10、1/5,连接节点分别为单列、双列螺栓的缩尺比1∶10网壳试件,进行了全跨、半跨以及破坏荷载作用下的试验。研究结果表明:在不同加载阶段,试件节点位移基本呈顶点位移最大,1环其次,2环最小的趋势,矢跨比对试件的初始刚度影响较大;半跨加载阶段,矢跨比对试件刚度的影响比全跨加载阶段更明显;破坏荷载作用阶段,矢跨比对提高试件跨中挠度达到l/400(l为跨度)时的加载值的影响更大,节点刚度对提高杆件出现第2条裂缝时的加载值的影响更大;矢跨比越大,试件由于节点处应力集中而易发生开裂,节点刚度提高有利于抑制第2条裂缝的发生,并减缓试件刚度的退化;矢跨比大的试件易发生承载力破坏,矢跨比较小的试件易发生失稳破坏。
In order to analyze the influence of different node stiffness and ratio of span to span on the mechanical behavior of single-layer K6 -shaped reticulated shell, four spans of 4 m were designed, and the ratio of sag to span was 1/10 and 1/5 respectively. The connecting nodes were Single row, double row bolt scale 1:10 reticulated shell specimens, under full span, half-span and under the action of destructive load test. The results show that the displacements of the specimen at the different loading stages are basically the maximum, the displacement of the specimen is the largest, The effect of specimen stiffness is more obvious than that of full-span loading stage. The effect of sag-span ratio on the loading value when the mid-span deflection reaches 1/400 (l is the span) The second one is to increase the load value when the second crack occurs. The larger the sag ratio is, the easier the specimen cracks due to the stress concentration at the node, and the higher the node stiffness is, the lower the second crack is. The rigidity of the specimen is deteriorated; the bearing capacity is liable to be destroyed when the ratio of the length-span ratio to the height of the specimen is large;