下弦为预应力索的协同网架动力特性分析

THE DYNAMIC ANALYSIS OF COMBINATIVE GRID COMPOSED OF PRESTRESSED CABLES INSTEAD OF THE LOWER CHORD

构想了一种用预应力拉索代替网架下弦杆的新型协同网架,对普通网架和该种协同网架动力特性进行了有限元分析,认为该种结构在动力作用下是可行的结构体系。并通过算例分析了协同网架竖向地震内力,证明该种新型结构体系抗震性能在相同条件下优于普通网架。同时也指出该种新型结构仍需继续研究的方向。

A new type of combination grid system named as cooperative grid whose lower chords are(prestressed cables) was conceptualized.Its dynamic analysis by finite element was given.According to the data of analysis,it is recognized the cooperative grid is practical under dynamic loads.An example has been given and its internal force under vertical earthquake was analysed,which proved the performance of combinative grid under earthquake is superior to the ordinary grid.In the end,the direction of its continuous research was shown.