Theoretical And Experimental Research On Six-bar Tetrahedral Cylindrical Lattice Shells

With the development of science and economy in China,building industrialization has become an important direction for architectural structure.It also brings tremendous development opportunities for prefabricated spatial structures.Based on this background,a new-type six-bar tetrahedral cylindrical lattice shell was proposed in this thesis.The structural system is suitable for standardized design,industrial production and prefabricated construction.Systematical theoretical and experimental research on the new prefabricated spatial structure were carried out.This study lays the foundation for further engineering applications of six-bar tetrahedral cylindrical lattice shells.Chapter 1 reviewed the classification and development of spatial structures and the analysis methods for lattice shells.Abroad and domestic situations of researches and applications for prefabricated spatial structures were introduced.The research background,significance and contents were elaborated.In Chapter 2,an innovative prefabricated spatial structure--six-bar tetrahedral cylindrical lattice shell was proposed.Configuration of the shell was analyzed.And a new type semi-rigid joint for the prefabricated structure was developed.The joint is lightweight and easy to assemble.In Chapter 3,static and stability analysis of the shell with semi-rigid joints were carried out.Full-span uniform load case and combined case with full-half-span loads were considered in the calculations.Six-bar tetrahedral cylindrical lattice shells preform well in integral rigidity,mechanical property and stability.In Chapter 4,an applicable forthright design method for six-bar tetrahedral cylindrical lattice shell was put forward.The validity and rationality of the method were verified.The forthright method can also be applied to other space grid structure's design controlled by stability.The method was used to design for a 45m-span six-bar tetrahedral cylindrical lattice shell.Technical-economic index and steel quantity index for the shell is good.There is a bright prospect for its engineering application.In Chapter 5,the vibration characteristic of a six-bar tetrahedral cylindrical lattice shell was studied.The preferences for the parameters of Rayleigh damping matrix construction in dynamic time-history response analysis were discussed.The structural dynamic response to rare earthquake was carried out.Six-bar tetrahedral cylindrical lattice shells preform well in anti-seismic property.In Chapter 6,based on a 7.2m-span test model of six-bar tetrahedral cylindrical lattice shell,a tridimensional fine-tuning bed jig was developed to ensure the manufacturing precision of the pre-made six-bar tetrahedral units.Stacking and transport of the units were practiced.The assembly process from units to the integral shell was conducted in an experimental hall.The structural assembly errors of the shell were measured,and the measurement results verified the installation accuracy of the test model.In Chapter 7,static tests of full-span uniform load case and half-span load case on the model were conducted based on the test model of six-bar tetrahedral cylindrical lattice shell.The experimental errors were analyzed.The experimental study on six-bar tetrahedral cylindrical string lattice shell was also carried out.In Chapter 8,the research were summarized.And some suggestions for future research were given.