Elasto-Plastic Time History Analysis Of A Long-Span Pipe Truss Structure

The development of large-span spatial structure has become an important measurement of the scientific and technological level of a country's construction. Compared with planar structure, large-span spatial structure has plenty of advantage properties such as reasonable resistance, light weight, good anti-seismic performance, and short construction period. It is of rich forms and artistic expressions.As for the large-span structure in seismic region, the span-increasing and structure-complicating will inevitably bring negative factors. And serious consequences will be brought by structure collapse. Therefore, the anti-seismic performance study on large-span spatial structure is of great significance.Through elastic-plastic time-history analysis under strong earthquake, this study aims to master the stress and deformation conditions under strong earthquake and find weakness link so as to take proper anti-seismic measures to prevent collapse caused by key member failure.This study takes a real large-span steel truss structure as the background project to analyze its anti--seismic performance under a rare earthquake whose seismic intensity is 8. Details are as follows:(1)To give quantitative solution on nonlinear performance of stadium roof steel pipe truss structure under designed earthquake, and research the deformation, plastic members and its damage situation as well as elastic-plastic behavior of long-span steel truss structure in strong earthquake. The specific research indicators include maximum span displacement(torsion span ratio), maximum overhanging displacement(torsion span ratio) and maximum bearing reaction force, etc.(2)To describe plastic development process of tube truss structure, and the generating order of member 's plastic hinges. And then analyze the yield mechanism of the structure and assess its rationality.(3)To research the deformation and damage situation of structure's key parts and members, the focusing structure parts include but are not limited to the following parts: the strengthening structure part, the structure supports and its adjacent area with the scope of 1 to 2 cells, the cantilevered root of structure, etc.(4)To discuss the overall structure's seismic performance under designed earthquake and find weakness lever or(and) weakness part.(5)To evaluate structure's seismic performance based on the above research results and provide suggestions for structural designing.