Experimental Study On Mechanical Properties Of Ordinary Concrete After High Temperature

With the rapid development of society,daily life is full of rich,and the factors of ignition become more and more,so that the building fires frequently,which brings huge losses to the society.In view of this situation,the detection and identification of the mechanical properties of buildings after fire has become a social hot spot.This paper takes the engineering example as the research background,simulates the fire process of concrete structure by the high temperature test of ordinary concrete,sorts out and observes the apparent situation and mechanical performance of ordinary concrete after high temperature,analyzes the measured data and summarizes the corresponding laws.Combined with engineering examples,the mechanical properties of ordinary concrete structures after high temperature fire and the detection and identification of concrete buildings after disaster are systematically studied and analyzed,and suggestions for the reuse and repair of post disaster buildings are put forward.The performance of ordinary concrete after high temperature changes with the change of various factors.In this test,several variables will be set up,including concrete design strength,maximum temperature,and constant temperature duration.According to the measured data and engineering examples,the research results are as follows:(1)The loss on ignition rate is used to express the loss of ordinary concrete after high temperature.The greater the loss on ignition is,the more serious the damage to concrete is.The loss on ignition rate of ordinary concrete increases with the increase of the maximum constant temperature and slightly increases with the increase of the constant temperature time,but the influence is not obvious.(2)The loss of mechanical properties of ordinary concrete after high temperature is mainly due to the influence of the highest constant temperature,and the influence of constant temperature duration on it is based on the highest constant temperature,although it is small,it cannot be ignored.(3)Combined with engineering examples and test summary,the paper describes the appraisal procedure of common concrete structure after fire and summarizes the damage assessment and analysis methods of post disaster buildings.Figure[54]table[15]reference[68]...