Experimental Study on Structural Performance of RC Exterior Beam-Column Joints Retrofitted by Steel Jacketing and Haunch Element under Cyclic Loading Simulating Earthquake Excitation

Table 1

Test results of concrete compressive strength.

Specimens	J	J-S1	J-S2	J-H
Testing day (days)	20	21	23	25
Concrete compressive strength (MPa)	20.87	20.14	18.64	19.8