Form-finding of a mixed structure with cable nets and tubular trusses

This paper presents the main results of the form finding analysis, model testing and on-site investigation on a mixed structure consisting on a system of steel tubular trusses coupled with a spatial cable net. Firstly, the combining method of force density and finite element is proposed for the form finding analysis of the mixed structure. Then, experimental tests are carried out on a scaled model in order to assess the different levels of pretension to be introduced in the cable system. Finally, the result of the on-site assessment activity carried out to monitor the real force level acting on different cables is presented and the comparison between the inspection results and the design target is made. The construction of the mixed structure has been successfully carried out and completed on the basis of the work presented in this paper.

► A form finding analysis is completed on a mixed structure including cable nets.
► The structural stiffness changes little under varied pretension and thermal loads.
► The pre-tensioning way in construction is decided through a model test.
► The on site inspection shows that construction of the mixed structure is successful.