Study On The Fire Performance Of Reinforced Concrete Shear Walls Strengthened With Epoxy Resin

For buildings and structures with construction defects or whose seismic fortificationnot reaching the current standard requirements, or exceeding its life span but still in used, weneed to reinforce the structural elements which did not meet the safety regulations. Epoxyresin and epoxide resinous materials are usually used in these reinforcements. Due to the lackof refractoriness, when used in reinforcement to important elements such as steel concreteshear wall, epoxy resin retains certain safety hazards of fire, and its refractoriness needsfurther researches.To study the refractoriness of epoxy-resin-reinforced steel concrete shear walls,according to real examples I designed1indefective concrete shear wall test specimen and3test specimens with defects and reinforced with epoxy resin. With the open-flamed exposureaccording to the ISO834standard temperature rising curve under a constant vertical load, Icompared the result and studied how different defect sizes affected the refractoriness ofconcrete shear walls.After the test, the paper describes the shape changes of every shear wall specimen, andtakes comparative analysis on the records of their axial deformation and temperature fieldduring the entire experiment. The result shows that after a3-hour fire resistance test, the mainparts of three of the specimens do not produce significant damage, and the axial displacementof them fail to reach the decision value of the fire-enduring limit and meet the requirement offire endurance in the specification. While the rest one of specimens gets a compression failurein high temperature. The epoxy resin reinforcement layers of the specimens that have beenreinforced with epoxy resin have carbonized, and cement mortar protective course hasseparated, even split away off the concrete. Buckling phenomenon appears in somedistribution bars. That means the course can’t play an effective protection.Based on the test, apply numerical simulation analysis towards the temperature filed ofspecimens with finite element software ABAGUS. and do comparative analysis and mutualauthentication on the theoretical and test results. It turns out that the theoretical and testcurves match each other satisfactorily.The compression standard capacity of the section of the specimen is worked out with temperature value which is worked out by test and numerical analysis, and it is taken to do acomparative analysis with characteristic value of construction element design. Resultsindicate that the theoretical calculation capacity basically meets the test situation, and thefurther analysis shows that when shear wall designed to meet Level4seismic levelsaccording to actual seismic code is reinforced by epoxy resin, the loading capability of itleads to potential safety hazard not meets the requirements in high temperature.The research result of this paper not only provides a basis for appraisal ofreinforcement results in engineering case, but also provides test data and analytical methodfor anti fire design of reinforced concrete shear wall with epoxy resin. It has certain guidingsignificance in the process of design and practice of actual reinforcement engineering.