In order to accurately measure the stress-strain relationship inside concrete under compression,resis-tance strain gauges are suggested to be placed on acrylic resin rods to measure the internal strain of concrete specimens.A large-scale micro earth pressure cell is developed to measure internal stress in concrete.Embed-ding the relevant testing equipment inside the concrete test specimen,the uniaxial compression test of the con-crete is carried out,and the accurate stress-strain relationship data inside the concrete is obtained.The results in-dicate that the internal constitutive model of concrete has good ductility compared to traditional constitutive mod-els,and the internal peak strength is much higher than traditional constitutive models.Combined with several representative concrete constitutive equations,the test is simulated by finite element method,and the stress-strain curve,peak strength and peak strain are compared and analyzed.The results show that the measured inter-nal stress-strain curve of concrete is reasonable and accurate,and the relevant measurement methods have good accuracy and feasibility.The finite element simulation results based on Chinese design model are in good agree-ment with the experimental results,which can be further popularized.
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