Research Of Security Evaluation System On Collapse Resistance For Roof Latticed Truss Structure In Shenzhen Citizen Center

In the past, space latticed truss structures (Abbr. SLTS) were treated as exceptional and non-traditional structures, but now are accepted as the economical and comfortable structures, and have been hot constructions during recent years. There are many advantages in SLTS such as high space stiffness, moderate stability, good Earthquake resistance capacity, sound bearing capacity. In the other hand, due to magnitude dimension, subjected to too much random load, and exposing in bad environment, SLTS are affected easily by the natural disaster.The intelligent inspect system for roof SLTS in Shenzhen citizen center is selected as a practice background in this paper, all analysis and study works hinge around the assistant section of inspect system, safety evaluation system for roof SLTS. The aim of study is getting through the engineering project successfully. At first, the integral bearing capacity of SLTS is calculated and analyzed. Using precise finite element analysis, operation state of latticed truss structure during the elastic phase can be mastered, and key inspect regions, namely weak enduring region, can be seek through results analysis. Thus, analysis of SLTS can be split into two sections: key inspect regions and normal inspect regions. Different regions are analyzed by respective methods. As far as normal regions are concerned, only the elastic characteristics of structure and its parts are considered and all non-linear characteristics are excluded. In contrast, as for key inspect regions, the elastic and plastic characteristics of structure and its parts, even the effect being parts invalidation, should be taken into account completely as well.Firstly, static analysis of SLTS subjected to design load is done, employing space link series FEA, and enduring capacity and internal force distribution of latticedtruss structure may be realized to some extent, so primary decision of key inspect regions of roof SLTS can be run in the thesis. According to former research products, when choosing rigid node, analysis in structure analysis, especially in non-linear analysis of SLTS will be reasonable. Hence, inherent characteristics of SLTS, together with diversification regulations of inherent characteristics using different model boundary conditions, are studied employing space beam series FEA. Taking foundation on analysis, dynamic analysis of SLTS under Earthquake load is done and structure response can be available.Because SLTS owns too many parts and complex supporting conditions, and invalidation of few parts or nodes does not have significant effect for structural bearing capacity, research orientation is transferred to structural support system in chapter 4 of the thesis. Limited loading capacity and safety index of steel bracket of SLTS are calculated and analyzed for providing theoretic upper limit to safe operation of support system. In the 5th chapter, single steel bracket of SLTS under violent external load is supposed to be invalid, structural response and bearing capacity under dead load at that moment of bracket invalidation is analyzed.Due to complex research object and involving in many fields, structure of the thesis appears to be incompact. But research works always hinge around the masterstroke which, in order to provide sufficient theoretical foundations for safety evaluation system of the intelligent inspect system, all kind of critical states of latticed truss structure are made effort to explore through certain research means.