THEORETICAL ANALYSIS ON ASEISMIC BEHAVIOR OF STEEL REINFORCED CONCRETE COLUMN-STEEL TRUSS BEAM COMPOSITE JOINTS

The theoretical analysis is conducted for the aseismic behavior of steel reinforced concrete column-steel truss beam composite joints by the basis of the results of experimental research against the backdrop of China Science & Technology Museum. Six current formulae calculating the shear capacity of steel reinforced concrete column-solid web steel beam joints are discussed, and the formula proposed by Zhao Hongtie is modified in order to account for the contribution of web stiffeners to the shear capacity of the joints. These formulae are conservative for calculating the shear capacity of the joints discussed in this paper and the modified Zhao Hongtie’s formula and the formula given by Tang Jiuru, which both account for the composite effect, can precisely predict the shear capacity of the joints. Furthermore, how different failure modes influence the aseismic behavior of the joints is discussed and analytical or design methods to control the failure modes are also suggested. Finally, by using the general finite element program MSC.MARC(2005r2), a full process nonlinear numerical simulation of these joints gives a satisfactory result. The conclusions are helpful for the application of steel reinforced concrete column-steel truss beam composite joints.