To investigate the load transferring mechanism of different corner fitting joints under horizontal static load

horizontal static load tests of full-scale frames with four types of corner fitting joints (shaped of L

T

cross

and grouting L) were designed based on the double-layer single span structure of a proposed new assembled composite light-weight slab structure residential project. The working performance and failure characteristics of the steel frames with different joints were studied

and the results were compared with ABAQUS numerical simulations. According to the results of tests and numerical simulations

the initial stiffness and ultimate bearing capacity of the frames

as well as the strain values at different cross sections were obtained. Results show that the corner fitting joints of the new light-weight slab structure worked well

the steel frames broke in the beam hinges

and the joints were intact

which fulfilled the design requirements of "strong column and weak beam" and "strong joint and weak member". The double columns of T shaped joint had a good cooperative performance

and the columns of L and cross shaped joints were prone to deformation. Small diagonal braces and grouting joints increased the initial stiffness of the steel frames by 38% and 14% respectively. The double beams worked independently

and the multiple columns worked incompletely independently. A calculation method for equivalent bending stiffness of double-beam and multi-column was proposed through strain analysis. Numerical simulations agreed well with the tests results

which verified the correctness of the conclusions.