Study On Control Of Plane Beam String Structure Construction Process

Beam string structure (BSS) is a new kind of composed roof structures. Arch/beam and struts connected with cable were main components of BSS. Therefore, BSS have distinguish characteristics such as reasonable structure form, convenient construction, novel and terse model, because of the better compress bearing capacity of arch/beam and the better tension bearing capacity of cable. Based on the former research outcomes, this paper is mainly focused on the control of construction process for planar BSS.For a practical planar BSS construction process, the Qianan Cultural and Exhibition, research works carried out in this paper according to the steel structure manufacturing processing, on-site consolidation process, hoisting process,prestress tension process, construction monitoring process, etc…Firstly, the welding between steel castings and the thick plate of the cable end joints in the construction process was introduced and classified. In this process, the key problem of design and welding for steel castings and the 80 thick plate was study and was solved by compiling a reasonable welding program to control the welding deformation and to eliminate welding stress force effectively.Secondly, the stability of BSS and members in the hoisting process were calculated so that to study the influence and optimum design of temporary supports arrangement as well as the safety of BSS in these supports demolition process. By means of software ANSYS, the hoisting plan of BSS was calculated and was determined. As a new type of prestress steel structure, BSS has a complicate loading condition in the construction process. Especially for the cables, the complicate loading condition, which is always slightly different in the construction and calculation, would determine the final shape and safety of BSS. Therefore, some monitoring methods for construction process is necessary and was studied in this paper.Finally, characteristics of Planar BSS were summarized and some proposed research works for BSS were put forward in this paper, such as new materials, new joints, new techniques, prestress control and specification of model calculation etc…...