Abstract
PurposeGiant orthogonal grid barrel vault is generated by deleting members in the inessential force transfer path of the two-layer lattice barrel vault. Consisting of members in the essential transfer path only, giant orthogonal grid barrel vault is a new type of structure with clear mechanical behavior and efficient material utilization. The paper aims to discuss this issue.Design/methodology/approachThe geometrical configuration of this structure is analyzed, and the geometrical modeling method is proposed. When necessary parameters are determined, such as the structural span, length, vault rise, longitudinal and lateral giant grid number and section height to top chord length ratio of the lattice member, the structure geometrical model can be generated.FindingsNumerical models of giant orthogonal grid barrel vaults with different rise–span ratios are built using the member model that can simulate the pre-buckling and post-buckling behavior. So the possible member buckle-straighten process and the plastic hinge form–disappear process of the structure under strong earthquake can be simulated.Originality/valueSeismic analysis results indicate that when the structure damages under strong earthquake there are a large number of buckling members and few endpoint plastic hinges in the structure. Dynamic damage of giant orthogonal grid barrel vault under strong earthquake is caused by buckling members that weaken the structural bearing capacity.
Highlights
Lattice barrel vault has the advantages of both frame structure and shell structure
The lateral lattice members are orthogonal to the longitudinal lattice members. This is a new type of structure with efficient material utilization, and its mechanical behavior need to be further studied. It is the theoretical basis of the seismic design method to deeply study the objective laws of the dynamic responses and the damage mechanism of the giant orthogonal grid barrel vault under strong earthquake
Based on the objective laws of the structural dynamic responses, the damage mechanism of giant orthogonal grid barrel vault under strong earthquake is studied in this paper
Summary
Lattice barrel vault has the advantages of both frame structure and shell structure. In order to make lattice barrel vault span bigger area, the thickness or the layer number of the structure is usually need to increase. This would cause the increment of the structure self weight. By deleting the members on the inessential force transfer path of the two-layer lattice barrel vault a “hollow” lattice structure can be generated. This structure consists of giant lattice members which are generated by the remaining members. Financial supports from Natural Science Foundation of Tianjin (18JCTPJC66200) and Scientific Research Program of Tianjin Education Commission (2018KJ244) are gratefully acknowledged
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