Now space grid structure is becoming a popular construction , and it is very important in theory and practicality to workout the cad software that is used for space grid structure 空间网格结构的建设在国内外方兴未艾，开展对于这种结构的研究，并研制出可供设计的cad软件系统具有一定的理论意义和重要的实用价值。
The thesis provides some samples to prove the sgscad , and studies the behavior of space grid structure under static . moreover , the thesis puts forward the issues in practice calculating through results that have been calculated 通过实际结构计算，验证了程序的正确性，并分析研究了空间网格结构的静力特性，提出了在实际计算中需注意的一些问题。
Space grid structure is greatly developed in our country in the past two decades because of its reasonable stress , big coverage area , rich shape and so on , which makes it be more and more welcome and attractive . the structure has a fine prospect 近二十多年来空间网格结构在我国得到了很大的发展,因其受力合理、覆盖面积大和造型丰富而备受欢迎,是一种有广阔发展前景的结构形式。
As a kind of complex higher - order hyperstatic structure , space grid structures was ever considered as a most safe structure when it is applied widely , once a stick of member quit working , other member would help it to endure external force 空间网格结构作为一种复杂的高次超静定结构，在其广泛应用的同时，人们曾认为它是最为安全的结构，一旦一根杆件退出了工作，会由其它杆件帮助其承受外力。
In light of object - oriented idea , this paper details the pre - process part and the post - process part of space - grid structure cad program , and how to deal with mixed - language programming in windows environment with visual c + + and visual fortran 引用现代面向对象的设计理念，本文详尽地研究了空间网格结构计算机辅助设计的前后处理问题，及windows环境下用visualc + +和visualfortran进行混合程序设计的方法。
By the means of lanczos in dynamics analysis of large space grid structure , the thesis workouts inherent frequency and models . this method can solve eigenvalue more fast than that of means called subspace iteration , and can reduce the possibility of losing eigenvalue 通过研究lanczos方法在大型结构动力分析中的应用途径，在程序中采用了该方法来求解空间网格结构的自振频率和振型，使sgscad在计算结构自振频率时速度更快，并减少了漏频现象。
According to pkpm ' s general request , we have done primary development of the pre - process part and the post - process part of space - grid structure cad program in cfg graphic supporting system with object - oriented program language c + + . we have completed twenty - four kinds of modeling of normal space - grid structure and partial work of post - process part . finally , credibility of the system is verified by calculating examples 依照pkpm的总体布局要求，采用面向对象的程序设计语言c + + ，在cfg图形平台上进行了空间网格结构计算机辅助设计前、后处理的初步开发，完成了二十四种标准网架、网壳的前处理建模及一部分后处理工作，并选用例题对程序进行了验证，表明程序能提供方便实用的前、后处理功能，结构计算分析结果是准确可靠的。
If we want to monitor the damage of the span lattice roof structure , the wind - induced responses and identification of parameters become the important problems first of all , which also the key technique of the damage monitoring of the structure . the method of time domain parameter identification is superior to the method in frequency domain : the structural response is only needed to identify the parameters of the structure 时域参数识别方法具有频域方法无可比拟的优点,仅仅需要结构的响应信息,便可实现结构的参数识别,尤其对于大跨空间网格结构,人为激励往往有很多的弊端,因此,积极发展有效的时域参数识别方法,还是很有现实意义的。
This paper introduces the developing tendency of the space structure and the application of the pretensioned space lattice structure , summarize the analysis method and relation between lattice structure and pretensioned space lattice structure . dissertate the space pole - truss displacement method , tendon working principle , set forth the method of optimal design and whole process design . includes the use stage design and construction stage design of pretensioned space lattice structure 本文首先介绍了空间结构的发展趋势及拉索预应力空间网格结构的应用情况，概述了网格结构与拉索预应力空间网格结构的分析方法及其相互关系，论述了空间杆系桁架位移法，拉索作用机理，阐述了拉索预应力空间网格结构的优化设计及全过程设计的设计方法，包括拉索预应力空间网格结构使用阶段的设计和施工阶段的设计。
Both latticed frame and reticulated shell are space grid structures , but their mechanical property has many difference , the integral stressing performance have analogy with slab in a sense , it mainly bear bending force ; then reticulated shell is mainly stress membrane fore , the integral mechanical property is similar to continuous shell 网架和网壳虽同属于空间网格结构，但其力学性质有较大区别，网架在某种意义上其整体受力性能类似于平板，以受弯曲力为主；网壳则接近于连续壳体，结构受力以薄膜力为主。
