Theory analysis for force transferring performance of energy-saving block and invisible multi-ribbed frame wall

Based on the parametric analysis by means of nonlinear finite element model(FEM) program,the factors which may influence bearing capacity and stiffness of wall were theoretically studied with the created finite element model for energy-saving block and invisible multi-ribbed frame,including shear-span ratio,axial compression ratio and reinforcement;furthermore,single force transferring performance of box grid and interaction between energy-saving block and invisible multi-ribbed frame were studied too.The results show that with the increase of shear-span ratio,the decline of wall stiffness is greater,and the ultimate capacity decreases gradually till to a stable level;with the increase of axial compression ratio,the three-stage-stiffness and the ultimate capacity of wall increase to a certain degree;with the increase of reinforcement,the wall stiffness slightly increases but limited,and the ultimate capacity of the wall increases.Pure box grid failure mode is for frame bending damage,the moment values are the greatest in the four corner areas and the moment plays a main role,the structure becomes a mobile system and bearing capacity decreases after the four corner areas occur to plastic hinges;invisible multi-ribbed frame and block work together to effectively reduce the damage degree of the box grid,which has great protection for the working performance of rib beam and rib column.