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Constitutive model of stone masonry is an important foundation and prerequisite for physical calculation and finite element numerical simulation of stone masonry. In order to further study the constitutive relationship of stone masonry under uniaxial compression, based on the theory of damage mechanics, the two-parameter Weibull distribution function was applied to reflect the damage variable, and its parameters were determined according to the characteristic conditions of the whole process of the stress-strain curve of stone masonry under uniaxial compression. The uniaxial compression damage constitutive model of stone masonry was derived and established, and the correctness of the constitutive model was verified by the existing test data. The constitutive model was compared with the typical masonry constitutive model. Finally, the finite element analysis of the existing stone masonry arch bridge test was carried out to verify the applicability of the constitutive model. The results show that the model is in good agreement with the uniaxial compression test results of existing stone masonry. The established model verifies the general law of masonry damage evolution and accords with the general trend of typical masonry constitutive model. The model can be applied to the finite element analysis and calculation of masonry structure with good applicability. [ABSTRACT FROM AUTHOR]

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Aiming at the problems of low calculation accuracy by using traditional bolt connection model and parameter identification of bolt structure dynamic model, the six parameter Iwan model was introduced to numerically solve the force displacement relationship equation and draw the nonlinear force displacement relationship curve of Iwan model. The universal testing machine tensile test and vibration experiment platform excitation test were combined to identify the parameters of the model and realize the model construction. The experimental results show that with the increase of bolt diameter, the macro sliding residual stiffness increases, and the energy dissipation of the model decreases. The research results can provide a reference for the design, analysis and calculation of bolt structure. [ABSTRACT FROM AUTHOR]