Test And Analysis On Load-bearing Capacity Of Steel Tubular Falsework With Bowl-button-type Connection

Compared with ordinary steel tubular falsework with fastener-type connection, steel tubular falsework with bowl-button-type connection has advantages of more convenient scaffold work, more stable node performance, and more favorable mechanical properties, and it is more and more commonly employed in various projects. However, the lack of a sophisticated code restricts the promotion of this steel tubular falsework. In this thesis, the research of the capacity of the Steel tubular falsework with bowl-button-type connection is numerically and experimentally carried out, and the highlight of this thesis is to provide some guidance for the establishment of a pertinent technical code. The major content of this paper includes the following three parts.(1)A steel tubular falsework with bowl-button-type connection is numerically modeled in ANSYS. Eigenvalue buckling capacity and non-linear stable capacity of the steel tubular falseworks are studied, and both rigid connection and hinge connection are respectively considered. Moreover, the effects of vertical tube space, horizontal tube space, top space, the latitude of the bottom tube, and the aspect ratio are respectively considered in the calculation of the eigenvalue buckling capacity of the falsework with hinge connection.(2)A test with eight different steel tubular falseworks is carried out, and the effects of vertical tube space, total height, aspect ratio and bracing condition are discussed. The general mechanical performance of each falsework is analyzed.(3)ANSYS is used to study the stable capacity of the steel tubular falsework, in which the tubes are assumed to be connected with semi-rigid connections, and a non-linear buckling method is involved in the analysis. The numerical results agree well with the test results, which verified the reliability of the proposed semi-rigid connection model.The research results reflect that vertical tube space and top space are two main parameters affecting the capacity of Steel tubular falsework significantly, horizontal shear brace can restrict the lateral shift more efficiently than vertical shear brace, the semi-rigid connection model is reliable in the numerical simulation. In this thesis, a formula for calculating the effective length of standing tube is presented.