Design Of 6m-Span Five-Center-Arc Steel Sptial Arch Truss Pesudo-Dynamic Test Model With 0.4 Span Ratio And Modeling Of Its Tesa Procedure

This span of 6m around the single-span ratio of 0.4 Pin arch truss model for pseudo-dynamic test to test the design, installation and testing of experimental models of the process simulation. First, under laboratory conditions and the construction of the pseudo-dynamic tests to determine the model structure, and then use finite element analysis software, numerical analysis of the test model, the analysis considered the effect of geometric nonlinearity and material nonlinearity. Through the modal analysis, static analysis and time history analysis, have been the result of the modal structure, stability results and three nodes under seismic response and cell stress response and so the results found under different seismic waves critical damage peak acceleration, and predicted the destruction of shape about the structure and damage types, provide for the smooth test calculation cf. In this paper, are as follows:First,Model Design:Arch truss model cross-section with inverted triangle, triangular base length of 0.3m, high 0.3m, arch truss span (winding bearing spacing) 6m, vector high-2.4m. Steel used in this experiment types: use pipe winding bar chords parts are welded, belly bars and winding Sloping use pipe, material Q235. In order to simplify the model can ignore the bar in quality, in the arch truss on the choice of six nodes, each plus 2 tons of additional mass.Second,test simulation analysis:1, a structural dynamic model analysis, find the structure of the corresponding natural frequencies and mode shapes.2, on the structure of the eigenvalue buckling analysis, obtained the buckling factor and buckling mode.3, the structure is non-linear buckling analysis, obtained the buckling critical load, draw the load - displacement curve.4, studied separately EL arch truss wave, Ninghe waves, artificial wave three different seismic waves under different peak acceleration time history analysis, to draw the displacement curves and stress versus time. Study span ratio is 0.4 and the seismic response of arch truss failure mechanism.Third,through the analysis of this study, the conclusions and results obtained are as follows:1, completed the installation of pseudo-dynamic test model, loading device installation, determine the test displacement, strain measurement point layout program.2, through a nonlinear buckling analysis, the model of the buckling critical failure load for the 55363N.3, the test model through the three types of seismic waves under the dynamic analysis are: EL waves and waves of negative displacement Ninghe big variations in the structure of the unstable failure prone, and artificial waves are big variations in displacement , the intensity of damage-prone structures.4, through the test model three kinds of seismic waves under the dynamic time history analysis, Ninghe wave of dynamic response of the largest dynamic test will be determined by Ninghe wave. Structures under different peak acceleration experienced stage is different, can be divided into three categories:(1) When the earthquake acceleration peak 16000gal, the arch truss 14 of the negative control node displacement 9.15mm, while the structure of the compressive stress control unit 48 to 181MPa, does not exceed the yield stress of 235MPa, arch truss structure will be under the peak acceleration experienced only elastic stage.(2) When the earthquake acceleration peak 24000gal, the arch truss 14 of the negative control node displacement maximum 24.27mm, while the control unit 48 structures the maximum compressive stress 235.34MPa, arch truss structure in the peak acceleration, there will be bars the plastic phase.(3) When the earthquake acceleration peak 32000gal, the arch truss 14 of the negative control node displacement 243.6mm (static case, the node displacement to 92mm, the buckling failure occurs), while structural control unit 48 of the compressive stress 350MPa, then the whole structure has been buckling.Fouth,the paper numerical analysis and experimental purposes:This model structure on the stability, static and time history analysis, the goal is to be 6m span steel arch span ratio of 0.4 earthquakes in various different truss peak acceleration, the maximum deformation and maximum stress of the situation and undermine the critical peak acceleration and the failure patterns, for the smooth pseudo-dynamic test provides a useful reference to the conclusions.