Study On The Explosive Damage And Emergency Repair Technique Of The Pile Wharf With Reinforced Concrete Plate And Beam

In order to realize the conformation of damage on the pile wharf with reinforcedconcrete plate and beam under explosion, and understand the mechanical behavior ofconcrete-filled square steel tubes and new type of steel-concrete composite slabs usedfor emergency repair to the damage, offering the foundation on the evaluation ofexplosive damage and emergency repair, the simulative explosion experimental studyof the wharf was conducted, the experimental study on the effects of initial stress onbehaviors of concrete–filled square tubes and the mechanical behavior of compositeslab with stiffening rib made of shape steel were accomplished in the same time.Among explosion tests, 9 models were test outdoor to simulated the destructioneffects of 1000 pounds aerial bombs (hitting respectively on the middle span of theplate and the beam, the joint of beam and stake), and 3 models were test in laboratoryto simulate the destruction effects of 500 pounds aerial bombs (hitting on the beam,plate and the stake). The destruction phenomena were described in detail, and thedestruction effects were analyzed from determining the nature and the quantity. Thedestruction effects of the penetration and explosion in different positions on the wharfby MK82 and MK83 were studied with numerical methods. The numerical resultswere in good accordance with the test phenomena.In order to investigate the mechanical behavior of concrete-filled square steel tubes,an experimental study on 14 specimens with and without initial stress was conducted.It was found that initial stress coefficient, load eccentricity ratio, and ratio ofslenderness have marked influence on load carrying capacity under initial stress.Based the experiments, making use of the FEA software of ANSYS, nonlinearfull-range analysis was performed. The mechanical behavior of members with andwithout initial stress was compared by varying parameters. According to the results oftest and analyses, a kind of simplified model was suggested on the bearing capacitycalculation of members with initial stress effects considered.A new type of steel-concrete composite slab with stiffening rib made of shape steelwas present. The mechanical experiment of 9 specimens was accomplished takingaccount of influencing factor in form of reinforced rib, thickness of composite slab. Itis indicated that the strength of the composite slab should be calculated by the methodof according to limit state based on the amendatory plane cross-section assumption,and the deformation should be calculated by the method of considering additionaldeformation value influenced by interface slippages. Based on the test results, thenonlinear property of typical composite slabs is analyzed overall by the FEA softwareof ANSYS. The analytic values contain limit load, deflection and strain distributionof steel and concrete. The results fit close to the experimental results.