Reliability Analysis Of Grid Structure And Reticulated Shell

Along with the development of our economy，science and technology，the largespan space structure has been developed rapidly，Especially in the stadium of BeijingOlympic Games and the exhibition venues construction of Shanghai world expo，thescale of building and technical level are leading in the world，it will become amilestone in the development of spatial structure in our country．Space grid structureis a kind of typical large span space structure, widely used in the exhibition hall，gymnasium，concert hall，and other important public buildings，the security relates tothe life and property，the progress of the society, even the country’s safety andhonor．However，force state of space grid structure is complex，the theory ofreliability analysis and calculation methods is not yet mature，so in this paper, thecomponent and system reliability of grid structure was studied, and The specificcontent is as follows：(1) Firstly study the probability distribution model of load and resistanceparameters of the space grid structure．the reliability theory is mostly based onassumption parameters conform to the normal distribution, according to thecharacteristics of extreme value type of probability distribution, put forward a kind ofequivalent normalization method of extreme value distribution function．(2) Based on the APDL language of ANSYS，comply the command flow ofparameterized modeling，analysis and post-processing of the grid structure，this paperstudies the applying method of grid structure equivalent node load，initial defect，seismic load in the finite element analysis．PDS module of ANSYS is used to analyzereliability of the grid structure by direct Monte Carlo method and the Monte Carlomethod based on the response surface, compare the calculation results of two methods.Analyze the change law of the reliability of grid structure was affected by the Spanratio and the initial defects．(3) Study mechanical degradation model of single rod and tracing method of theultimate bearing capacity in the space truss structure. According to the characteristicsof the space truss structure and traditional failure mode searching algorithm (criterionmethod and theory analysis method), explore the suitable the search algorithm offailure modes for space truss structure．(4) Based on ANSYS custom sampling techniques，continually modify samplecenter to iterate, to fit out the failure surface which is Highly consistent with the real failure surface in the checking points by using the ANSYS PDS module．Study thefailure functions of latticed shell structure by the iterative response surface method．(5) Study the differential equivalent recursion algorithm to obtain system failuremodes and calculate system reliability of the space grid structure by PNET method．...