Pretensioned space lattice structure is a new kind of space structure which develops very fast in recent years . through taking the pretensioning with tendon , the space lattice structure could effectively improve the weight of bearing , control the distortion of the structure , minimize the cost of the engineering 拉索预应力空间网格结构是近几年发展比较快的新型空间结构体系。在空间网格结构中通过拉索引入预应力，能够有效地提高结构承载力。控制结构变形，降低工程造价。
The analytic model of the sgscad is based on finite element method and the experimental results that have been provided . to calculate correctly space grid structure , the sgscad utilizes the element of 3d bar or 3d beam that is distinguished by the mode of linking among the members of the structure to simulate varied types of the space grid structure 利用有限元方法，在已有实验结果的基础上，根据空间网格结构的杆件之间的不同连接方式，采用空间铰接杆系计算模型和空间梁系计算模型来计算不同形式的空间网格结构，编制了基于windows平台的空间网格结构cad软件sgscad 。
During the long active service time , the structure maybe presents all kinds of structural damage because such reasons as tired accumulating , environment corroding and natural calamity function , etc . in order to find those damages early , nip in the bud , and lower the damage of accidents , it is great meaning full to research the technique of online damage monitoring of the long - span lattice roof structure 结构在服役期间,由于疲劳累积、环境腐蚀及自然灾害等作用,可能出现结构损坏,因此,为了能够及时发现问题,防患于未然,把事故损失降到最低点,在结构正常使用情况下,对大跨空间网格结构进行在线损伤监测研究,就显得极有现实意义。
