Experimental Study On The Effect Of The Outer Layer On The Low-speed Impact Performance Of CFRP Reinforced Columns

Countries in recent years the significant increase in the number of traffic accidents,terrorist attacks and other events gradually,made of reinforced concrete structures under impact load after the mechanical behavior of this subject widely attention,performance after shock damage to building structure,not completely destroy the structure of the residual bearing capacity can meet the demand of construction,destruction of structure should be reinforced to meet the construction requirements,these problems are the main topics of the study at home and abroad in recent years.Due to the superior characteristics of CFRP materials,widely used in structural reinforcement,in recent years,research has shown that the structure in the static bearing capacity of the CFRP strengthening and seismic resistance to impact and fatigue resistance performance has greatly improved,but the CFRP reinforced specimen is still more need to study,especially the dynamic properties of CFRP reinforced specimen under the impact.This paper mainly studies the outer layer of CFRP reinforced specimen attached,experimental study on the impact properties of low speed at home and abroad for the attached to the outside layer of the research on the effects of factors on the CFRP reinforced specimen is few,after considering the CFRP reinforcement in the practical engineering of specimen is still need to attach a layer of building material in the outer most as protection and adornment effect,also in the actual structures suffer impact also exists certain outer layer,so the it has high practical significance,the influence factors in this article,we will through the 18 CFRP reinforced concrete specimens to drop weight impact test at low speed and axial compression test specimens of impact injury.The specific research contents are as follows:(1)The impact hammer head of different quality and different distance of different materials with different number of layers,outer with layer of CFRP reinforcement for low speed impact test specimens,after the analysis of the impact damage state of the specimens,acceleration time history curve and the dynamic response process,etc.,it can be seen in many aspects attached to the outside layer of low speed impact properties of CFRP reinforced column has the positive role.(2)The impact damage of axial pressure test specimens,after test is analyzed and the compressive failure state,the residual bearing capacity after time history curve,the corresponding points of the stress-strain curve,compared to the same conditions impact hammer head of different quality,different number of layers,different outer layer material of CFRP reinforced specimen compression test data to draw the damaged specimen compression damage probability is development by the impact position,attached to the outside layer effectively improve the remaining bearing capacity of the damaged specimens under axial compression.