Force Analysis Of Frame Structure Under Interaction Of Residual Deformation And Earthquake In Mined-Out Area

As more than 80% of the mining areas are located in seismic fortification region in China, the analyses of anti-seismic characteristics of buildings on goafs is the effective measure to solve the contradiction between underground mining and protecting the surface buildings. This research subject has important theoretical significance and application value for utilizing mine-area land resources and achieving the sustainable development of mining areas.The influence of residual curvature deformation and earthquake action on building is analysed on the basis of consulting plentiful domestic and foreign documents. According to mining subsidence science, soil mechanics, structural dynamics and finite element, this paper is mainly intended to take frame structure as its research subject. A reasonable model composed of soil, foundation and superstructure is founded by using finite element software ANSYS. Tianjin seismic wave is selected to analyse the interaction of residual deformation and earthquake in goaf. The main research contents are as follows:(1)Because structural dynamic characteristics analysis is the basis of time history analysis, the natural period and vibration mode of building structure are firstly studied considering soil-foundation-superstructure interaction, which laies the foundation for anti-seismic analysis.(2)The internal force and deformation of frame structure under seismic action and different residual curvature deformation are studied through analyzing several indicators such as foundation settlement, base reaction, axial force of column base, shear force and bending moment within the bottom beam end, and the maximum variations under earthquake action are also analyzed.(3)Compared with conventional design, the calculation results in different residual curvature deformation show that axial force on the bottom of the in-column increase whereas side-column decrease, the trend of reduction is not obvious, and the moment and shear are increase at the end of the beam, therefore, the reinforcement of the beam and column should be strengthened, and the conventional design is insecurity.(4)Study the internal force and deformation of structure on the changement of compression modulus of soil and foundation stiffness. Setting cushion could reduce the differential settlement of foundation and internal force of superstructure, which achieve the purpose of protection of bulidings.