Research And Application Of Prefabricated High-rise Phosphogypsum-concrete Composite Box Structure

Architecture plays an important role in the production and life of human society.With the rapid development of social economy,the urban population is increasingly concentrated,and land is becoming more and more tense,making the development of buildings into the air inevitable.Therefore,the construction of high-rise buildings is a social demand.The development of high-rise building structures is inseparable from the application of new materials,the development of structural theory and technology,and the innovation of construction methods.The phosphogypsum-concrete combination box structure is composed of reinforced concrete vierendeel sandwich plate,a cast-in-situ phosphogypsum-concrete grid frame composite wall and a reinforced concrete shear wall,wherein the inner cylinder adopts a reinforced concrete shear wall and the outer cylinder adopts cast-in-situ phosphogypsum-concrete grid frame composite wall,and the inner and outer cylinders are connected by a reinforced concrete hollow sandwich panel.In this paper,the seismic performance of reinforced concrete hollow sandwich plate,cast-in-situ phosphogypsum-concrete gird frame composite wall and phosphogypsum-concrete composite box structure is analyzed.Finally,the assembly of high-rise phosphogypsum-concrete composite box structure is proposed in combination with engineering project.The construction process,the specific research content is as follows:(1)Analysis of the natural vibration characteristics of reinforced concrete orthogonally positive vierendeel sandwich plate by beam-shell elements and solid elements.By comparing the influence of different finite element models on the structure frequency and vibration mode,the unit types used in the later analysis are clarified.And the constraints.By changing the height of the fasting sandwich panel,the thickness of the surface sheet,the grid size,the rib height and other parameters,the parameter analysis of the natural vibration characteristics of the fast sandwich panel is carried out,and the natural frequency of each parameter on the structure of the fast sandwich panel floor is summarized.The influence of the method and the simplified calculation method of the fundamental frequency of the structure under different constraint modes are proposed.The fundamental frequency calculation formula of the structure is verified by engineering examples.(2)Through the static analysis of the reinforced concrete orthotropic vierendeel sandwich plate,the internal forces of the upper rib,the lower rib and the shear bond of the vierendeel sandwich plate are studied to understand the mechanical characteristics of the structure,and the upper rib and lower ribs are defined.The forces of the shear bond provide a basis for the subsequent seismic response analysis of the vierendeel sandwich plate.The vibrational decomposition spectrum method is used to investigate the interaction of the fast-moving sandwich plate with horizontal earthquakes,vertical earthquakes and horizontal and vertical earthquakes.The distribution law of internal force is compared with the static analysis result under gravity load,and the internal force coefficient of structural ground motion is clarified.Through the parametric analysis of the vierendeel sandwich plate,the internal force coefficient of internal force and ground motion of each member of the vierendeel sandwich plate is clarified.The influence of different seismic intensities on the internal forces of the fasting sandwich panels is clarified,and a simplified calculation method for the seismic bearing capacity of the fast-moving sandwich plate is determined to evaluate the seismic safety of the fast-moving sandwich plate.(3)Through the force analysis of the concrete grid frame and the cast-in-situ phosphogypsum-concrete grid frame composite wall under horizontal load,the equivalent lateral stiffness and level of the concrete grid frame under different horizontal loads are derived.The calculation method of displacement,based on the frame-shear wall theory,the horizontal displacement calculation method of the cast-in-situ phosphogypsum-concrete grid frame composite wall under different horizontal loads is derived,and the parameter analysis is carried out by finite element software to understand the relevant parameters.Determine the rationality of the theoretical formula to be derived from the influence of the calculation formula.(4)Through the seismic performance test of the concrete grid frame and the cast-in-situ phosphogypsum-concrete grid frame composite wall,the experimental phenomena and failure characteristics of the concrete grid frame and the cast-in-situ phosphogypsum-concrete grid frame composite wall are understood.Analyze the seismic performance characteristics of the hysteresis curve,skeleton curve and energy consumption of the test piece,investigate the contribution of cast-in-situ phosphogypsum to the seismic capacity of the composite wall,and clarify the force mechanism of the cast-in-situ phosphogypsum and concrete grid frame.Based on the relevant theoretical knowledge,the key points of the skeleton curve of the specimen and the hysteresis rule are obtained.The resilience model of the concrete grid frame and the cast-in-situ phosphogypsum-concrete grid frame composite wall is proposed.Post-analysis provides the basis.(5)Using the finite element software to analyze the vibration-type decomposition reaction spectrum method of the phosphogypsum-concrete composite box structure,the concrete box structure and the equivalent box structure,to understand the frequency,period and vibration mode of the model,and analyze the box type.The displacement and stress of the structure,the internal forces of the upper ribs,the lower ribs and the shearing force of the upper and lower hollow sandwich panels are extracted,and the internal force coefficients of the ground motion sandwich panels are determined by comparison with the static analysis under gravity loading.Extracting the internal force of the top and bottom mesh frame,and comparing the static force analysis with the gravity load to determine the ground motion internal force coefficient of the grid frame,so as to clarify the rationality of the practical calculation method of the box structure.The computational model of the equivalent box structure is used to analyze the dynamic elastic time history,and compared with the equivalent box structure vibration mode decomposition method to understand the influence of different analysis software on the period,vibration mode and base shear force.Displacement,velocity,floor shearing force,etc.of equivalent box structure.The dynamic elastoplastic time history analysis is carried out on the calculation model of the equivalent box structure,and the displacement,velocity and shear force of the equivalent box structure under different seismic waves are extracted,and the seismic safety evaluation of the box structure is carried out.(6)Propose the assembly-type construction process of the high-rise phosphogypsum-concrete composite box structure,and clarify the assembly-type construction process of the phosphogypsum-concrete composite box structure.Determine the assembly unit and related joint structure of the reinforced concrete hollow sandwich panel and the phosphogypsum-concrete composite wall,and clarify the connection structure and construction measures of the splicing joint.