论文部分内容阅读
为研究某植物园铝合金网壳结构中新型铸铝节点的受力性能,进行了3个足尺节点试件的加载试验,考察了3种典型受力情况下铸铝节点的受力性能和破坏机理。试验结果表明,该铸铝节点平面外的抗弯刚度较大,但平面内的刚度较小,且属于半刚性连接节点;螺栓孔处截面是节点的薄弱部位;铸铝节点本身的破坏形式为脆性断裂破坏,延性较差,节点破坏前无明显征兆。同时,还对该铸铝节点在上述3种荷载作用下的受力性能进行有限元分析,并与试验结果进行对比。结果表明,有限元与实测结果吻合较好,验证了有限元模型的准确性和可靠性;同时,有限元结果给出了节点在荷载作用下的应力整体分布状况及随加载过程的变化趋势。基于试验和有限元分析结果,建议在铸铝节点设计中考虑采用合适的安全系数,避免突然破坏。
In order to study the mechanical behavior of the new cast aluminum joints in the aluminum alloy reticulated shell structure of a botanical garden, three full-scale joint specimens were tested for loading, and the mechanical properties and failure of cast aluminum joints under three kinds of typical stress were investigated mechanism. The experimental results show that the plane bending stiffness of the cast aluminum joint is larger but the plane stiffness is smaller and belongs to the semi-rigid joint. The section of the bolt hole is the weak point of the joint. The destruction form of the cast aluminum joint itself is Brittle fracture damage, ductility is poor, no obvious symptoms before node destruction. At the same time, the finite element analysis of the mechanical behavior of the cast aluminum joint under the above three kinds of loads is also carried out and compared with the test results. The results show that the finite element method is in good agreement with the measured results, which verifies the accuracy and reliability of the finite element model. At the same time, the finite element method gives the overall stress distribution and the trend of the stress distribution along with the loading process. Based on the results of experiments and finite element analysis, it is suggested that a suitable safety factor should be considered in the design of cast aluminum joints to avoid sudden damage.