Structural Performance Analysis On Prestressed Double-layer Latticed Intersected Cylindrical Shell

Prestressed double-deck cylindrical lattice shell structure introduces prestressedtechnology to double-deck cylindrical lattice shell structure, of which the cable carriespart of the structure internal forces to avoid the unreasonable structure stressing. Atpresent, the researches on the spherical lattice shell and single-layer cylindrical latticeshell have been maturing, however, those of the double-deck cylindrical lattice shellstructure, especially the prestressed double-deck cylindrical lattice shell structure arerelatively rare. Therefore, an actual project of large-span double-deck cylindrical latticeshell structure is selected as the research object in this paper. By comparison, fourcable layout schemes are picked out benefiting the structure stressing, combined withwhich the static analysis, linear and nonlinear stability analysis, vibration characteristicanalysis and the seismic performance analysis are conducted to the structure, in orderto provide some references to improve the design theories for the prestresseddouble-deck cylindrical lattice shell structure.Five cases with and without prestress are analyzed in this paper, combined withthree load conditions of full cross-vertical loads, half-span across vertical andhorizontal loads. What’s more, the effects of structure span ration, shell span and shellthickness on the static stability and dynamic characteristics are taken into account toobtain cable layout schemes with better performance and the general rules and scopesof different cable layout schemes with different parameters.First, the double-deck cylindrical lattice shell structure model is established toselect four kinds of cable layout schemes which can reduce the structure maximummember internal force, maximum replacement and the reaction at support from theexisting cable layout schemes.Then, in the static analysis, the effects of different factors on the structuremaximum member internal force, maximum nodal replacement and the reaction atsupport are compared to obtain the better cable layout scheme.Next, in the stability analysis, the effects of different factors on the criticalbuckling load are analyzed, in which only the structure non-linearity in the geometry isconsidered, assuming the material remains linear elastic.At last, both the structure natural vibration and the performances under seismicaction are analyzed. The effects of different factors on the structure fundamental frequencies are analyzed to see the extent of improvement in the structure overallstiffness caused by the cable layout scheme. And the maximum displacement envelopevalue and the maximum internal rod forces are compared in different conditions in theseismic load analysis.