Experimental study on seismic behavior and design method of reinforced concrete column-steel beam composite joints with embedded profile steel
To improve the force transmission efficiency and seismic performance of reinforced concrete column-steel beam(RCS)composite joint,a kind of RCS composite joint with embedded profile steel was proposed.Four specimens were designed and manufactured.Through the pseudo static test,the influence of the extension length and steel ratio of embedded profile steel on the failure mode and seismic performance of the specimen was studied,and the design method of the joint was proposed.The results show that the failure modes of the specimens can be classified into failure of the concrete column at the profile steel cutoff,concrete column end failure,and simultaneous failure at the profile steel cutoff and the concrete column end(boundary failure).Among them,the specimens with concrete column end failure have higher bearing capacity and energy dissipation capacity.When the extension length of the embedded profile steel exceeds the boundary length,the specimen undergoes concrete column end failure,which can realize the effective force transmission of embedded profile steel.The increase of the steel ratio of the embedded profile steel can improve the seismic capacity of concrete column end failure specimens,but the extension length of the embedded profile steel should also be increased.The flexural bearing capacity of the concrete column at the embedded profile steel cutoff is 68％of that of the ordinary reinforced concrete column,and the flexural bearing capacity of the concrete column end is 86％of that of the steel reinforced concrete column.Finally,the design method of the reasonable extension length of the embedded profile steel was proposed,and the design suggestions for extension length coefficient,steel ratio of embedded profile steel and joint were given.
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