Experimental Study On Mechanical Properties Of Bonded Anchors In Cracked Concrete Under High Temperature

Post-installed fastening is a means of anchorage on existing structure.Compared with the embedded anchoring of concrete,Post-installed fastening is widely used in engineering practice,for its higher precision,easier process and lower cost.Post-installed fastening includes Mechanical anchor bolt,bonded anchors and bonded rebars.And bonded anchors are widely used because of its fast construction and low cost.This paper mainly studies the mechanics of bonded anchors high temperature in cracked concrete,explores the relationship between bond strength and temperature,and contrasts failure modes,colloidal mechanical parameters under high temperature and temperature distribution of uncracked concrete.The conclusions mainly include:(1)The test members are designed to meet requirements of specifications and be relatively easy to operate by refering to related literature.The cracked concrete under normal temperature,high temperature and fire are tested.(2)17 tests are carried out with constant tension load and high temperature.The temperature,load and anchor displacement are measured,records failure modes of bonded anchors during tests.Fits the function relation between bond strength and temperature by test data collating.The bearing capacity of different failure modes under high temperature are analysed combining with experimental data.(3)The temperature distribution along the depth of the cracked concrete is obtained through fire tests,and contrasts with uncracked concrete.Calculates the bearing capacity of bonded anchors under different conflagration time with the conclusions obtained from high temperature tests.