Abstract:

The internal structure design of the first trail project constructed by cut and convert (CC) method is uneconomical and with cumbersome construction procedure. Hence, the structure should be improved. Firstly, the principle of the CC method is introduced, and the existing problems in the construction process of the trail project are analyzed. And then the structural characteristics of composite beam are summarized, the feasibility of composite beam as structure of the trail project is analyzed, and corresponding key structural measures are put forward. Finally, comparison is made between the theoretical stress value and monitoring value of longitudinal beam, and the reasons for the difference between them are also analyzed. The analytical results show that: (1) The concrete precast roof by CC method and the secondarily constructed shaped steel toplongitudinal beam could coworks under the design of composite structure. (2) The shear connectors, local stability of shaped steel and longitudinal connection construction measures of concrete flange are the keys to CC method to adopt composite structure design. (3) When regarding the longitudinal beam structure of the trail project as a composite structure, the beneficial effect of the concrete flange should be reduced appropriately according to the specific conditions.

Key words: structural cut and convert (CC) method, composite structure, composite beam, interfacial characteristics