The influence of axial compression ratios on the strong-column and weak-beam actualization of RC frames

As slab reinforcement will make the longitudinal beam overstrengthen in cast-in-place RC frame structures,a series of RC frame structures with different axial compression ratios are simulated by ABAQUS.The influences of axial compression ratios on the participation extent of the slab reinforcement in longitudinal beam overstrength are studied.The actualization of strong-column and weak-beam philosophy is analyzed in the RC frame structures with different axial compression ratios and at different connections.The occurring condition of a plastic hinge at beam end is discussed.It indicates that the axial compression ratios can greatly influence the participation extent of the slab reinforcement and it is easier for the occurring of plastic hinges at beam end in the RC frame structures with low axial compression ratio than that with high axial compression ratios.Moreover,it is more difficult for the occurring of plastic hinges at beam end at interior connections than that at exterior connections in the same structure.In order to actualize the no collapsing target of structures in strong earthquakes more effectively,it is recommended that the actual capacity of the beam end with considering the slab participation should be still smaller than the actual capacity of column end at the same connection.