Experimental Study On Seismic Performance Of Steel Reinforced Super-high-strength Concrete Column-Reinforced Concrete Beam Joints

The building damage and collapse caused by the earthquake often cause huge casualties and economic damage.In the previous massive earthquake,solid-web steel reinforced concrete composite structures only slightly damaged,showd good seismic performance.With a large number of high level and high-rise buildings, concrete strength continue to develop ultra-high strength,but the high brittleness of ultra high strength concrete also restrics its engineering application.Ultra high strength steel concrete composite structures fully use the compression performance of ultra high strength concrete and steel for concrete constraints well solute the brittleness of ultra high strength concrete. Studys have show that,ultra-high strength steel reinforced concrete has good ductility,therefore, in seismic region of high-level and high-rise buildings, steel ultra high strength concrete composite structure has wide application prospect,but on ultra high strength concrete composite structures at home and abroad,especially steel ultra high strength concrete column reinforced concrete beam frame side joints research has lagged far behind its engineering application.In this paper,the tests of five SRHC column to RC beam connection joints under low cyclic reversed load are carried out,influences of axial load ratio,volumetric stirrup ratio are analyzed on failure mode,hysteretic behavior and ductility.The experimental results show that:test parameters have a significant impact on the damage form of specimen,when the axial compression reinforcement is lower and the shear rate is high,the joint occurs plastic hinge beam end damage with better ductility,when the axial compression reinforcement is high and the shear rate is lower,the joints occur shear destruction with worse ductility;no matter what happens in the form of destruction,failure process of the specimens can be divided into elastic、yield、limit and destroy the four stages;the SRHC-RC have plumper hysteretic curves and better ductility.but compared with the steel node and steel reinforced concrete node.the hysteretic curves pinch phenomenon is more serious and the ductility is also worse.After the experiment,use the finite element analysis software ABAQUS to simulate the specimen in the experiment,the result of failure pattern、skeleton curve、ductility performance between the calculation results and test results are very similar and the error is in the permissible range.We can conform the finite element analysis on SRHC column RC beam joints is feasible and reliable,and the test results can be carried out in advance of the pre-determination.