Study On Seismic Performance And Life Cycle Optimization Design Of Passive Composite Wall Structure

Traditional building insulation technology has many defects.Its thermal insulation design life is generally only 25 years.The construction process will produce a large number of construction waste.The use of quality hazards exist in the process.Combined with the preliminary research of the research group,a passive assembly composite wall structure is proposed.The research methods of experimental research,theoretical analysis and numerical simulation are combined to provide the basis for the design,application and social promotion of the new structural system.The main research results are as follows:(1).Experimental study on mechanical and thermal performance of fiber reinforced EPS thermal insulation mortar.Based on the orthogonal test of 7 factors and 3 levels of fiber reinforced EPS thermal insulation mortar,the influence of various factors on the strength of fiber reinforced EPS thermal insulation mortar was revealed.The optimum mix ratio of fiber reinforced EPS thermal insulation mortar is put forward.Ratio coefficient between axial compressive strength and cubic compressive strength of fiber reinforced EPS thermal insulation mortar.In the process of loading,the specimen is plastically elastic.Based on the basic physical and mechanical parameters of the test,the damage constitutive model under uniaxial compression is established on the basis of continuum damage mechanics and plasticity theory.It provides the basis for the analysis and application of fiber reinforced EPS thermal insulation mortar in the thermal insulation and load-bearing composite wall.(2).Experimental study on seismic behavior of composite wall with thermal insulation and bearing capacity.The same size pseudo static test of 3 thermal insulation composite composite wall and1 ordinary assembled composite wall is carried out.The stress characteristics and failure mechanism of the composite wall with heat preservation and bearing capacity are studied.The seismic performance indexes of composite insulation wall with different insulation materials are compared.The test results show that: 4 of the walls in the failure stage have a strong collapse resistance.Their failure modes are flexural shear failure.The heat preservation bearing composite composite wall has stronger energy dissipation capability,in particular,the fiber reinforced EPS thermal insulation mortar sandwich thermal insulation composite wall.Its critical load value is obviously higher than other walls.The sandwich insulation layer can restrain the cracks in the wall.(3).Elastoplastic seismic response analysis of passive assembled composite wall structures.The whole stage calculation model of passive assembled composite wall structure--rigid frame composite plate elastoplastic model is put forward.Using the laminated plate theory and composite material theory,representative volume elements are selected.Using the equivalent material characteristics of representative volume elements,the composite wall is simplified as a material equivalent anisotropic elastic plate.An elastoplastic model of rigid frame composite plate is established by using a multi segment plastic connection element.Compared with the shaking table test results,the validity of the model is verified.Combined with the engineering example,the seismic performance indexes of the passive assembled composite wall structure with different insulation materials are compared and analyzed.The results show that the elastic plastic model of rigid frame equivalent composite plate preserves the original mechanical behavior of the structure and greatly simplifies the calculation of the model.It can simulate the actual failure process and dynamic characteristics of the structure at the elastic-plastic stage,and can be used for the nonlinear dynamic and static analysis of the structure.(4).Comparative analysis of residential building energy consumption with passive assembly composite wall structure.Based on the composite wall thermal resistance formula,a formula for calculating thermal parameters of fabricated composite wallboard is derived.The validity of the formula is verified by comparing with the test results of the protection hot box.Based on the theory of laminated plates,the composite wall with heat preservation and bearing issimplified as equivalent element of thermal series,and the calculation model of thermal parameters is deduced.Compared with ANSYS three-dimensional steady heat transfer simulation results,the validity of the formula is verified.Comparative analysis of the assembled composite wall and composite wall thermal insulation load-bearing integration index,and analyze the wall thermal index.Based on the climatic conditions in Xi’an,the passive building,composite wall structure,residential air conditioning season,heating season and annual energy consumption of buildings were analyzed by DesignBuilder building energy simulation.The results show that the thermal resistance of fiber reinforced EPS thermal insulation mortar sandwich thermal insulation composite wall is the biggest.The integration of thermal insulation composite wall thermal bridge each point were higher than that of Xi’an city minimum dew dew point.The building energy consumption of passive assembly composite wall structure is less than that of non thermal insulation composite wall structure residence.Fiber reinforced EPS insulation mortar sandwich insulation composite wall structure,residential building energy consumption is the minimum.(5).Research on life optimization design method of passive assembled composite wall residential buildings.Combined with the passive building integrated design strategy,a life cycle optimization design method for the passive assembly composite wall residential system is proposed.The two levels of decision optimization and structural optimization are established,and the optimal design model of energy saving and earthquake resistance is established.Building life-cycle cost minimization is the optimization objective.The model is optimized and approached by BP neural network.Perform passive detail optimization design and life cycle cost analysis.The results show that: the passive assembly structure of composite wall in the residential building life cycle integration of technology and application,effectively improve the component prefabrication rate and assembly construction rate,avoid building insulation construction quality problems,the implementation of building insulation and structure design of the same life.The life cycle cost of the utility model is saved by 9.52% compared with the common assembly type composite wall structure house.More than 15% of the cost of the traditional structure.The main innovations of this paper are as follows.(1).Configure fiber reinforced EPS insulation mortar.The stress mechanism and failure mechanism of composite wall with thermal insulation and bearing are studied.The fiber reinforced EPS thermal insulation mortar was prepared by orthogonal experimental method.Its basic mechanical properties were studied,and its failure criterion and damage constitutive model were determined.Through quasi static test,the seismic behavior of the composite wall with heat preservation and bearing capacity is studied,which provides the basis for the optimization design of the whole life of the structure.(2).A simplified numerical model for the whole process of passive composite wall structure is established.Based on the structure,structure and stress characteristics,representative volume elements are selected.By using the laminated plate theory and composite material theory,the composite wall with heat preservation and bearing is simplified as a material equivalent anisotropic elastic plate.Based on the equivalent material properties,the whole stage model of passive composite wall structure is established.The elastic-plastic model of rigid frame equivalent composite plate is established.The model can be used to analyze the nonlinear dynamic and static processes of structures.(3).A thermal calculation model of thermal insulation bearing composite wall is established.Research on passive assembly residential composite wall structure and building energy consumption of thermal loss.Based on the composite wall thermal resistance formula,the assembled composite wallboard is simplified as a thermal parallel equivalent element.Formulas for calculating thermal parameters of fabricated composite wallboard are deduced.Based on the knowledge of laminated plate theory,the composite wall with thermal insulation and bearing is simplified as equivalent element in thermal series.Deduce thermodynamic index calculation model.Wall thermal analysis.Contrast the mechanism of building energy consumption.It provides basis for energy-saving design of passive assembly composite wall structure building.(4).The whole life two level double objective optimization design method of passive assembly wall composite structure is put forward.Based on the results of structural seismic and thermal performance analysis,a method of life cycle optimization design for passive assembled composite wall residential buildingsis proposed.Building the two levels of decision optimization and structural optimization,energy saving and anti seismic dual objective building optimization design model.Quantitative analysis of impact indicators.The model is optimized by BP neural network.Seismic design and energy saving life cycle detail optimization design of passive assembled composite wall structure.It provides basis for social promotion and investment decision of passive assembly composite wall residential structure.