Study On Mechanics Performance Of Foamed Concrete Prefabricated Filled Wallboards

Foamed concrete is a lightweight,high-strength building material with good heat insulation and durability.Prefabricated filled wallboards made of foamed concrete with specific density have the functions of enclosure and thermal insulation.The wallboards can be factory prefabricated and assembled on site.With the development of green energy-efficient buildings and prefabricated buildings.It has a broad prospect.Based on the research achievement of the foamed concrete,this paper designs and constructs the foamed concrete prefabricated filled wallboards which are suitable for the 65% energy-saving building in the hot summer and cold winter area.Through the mechanical properties test,finite element simulation and theoretical analysis of three levels which are materials,wallboard and structural systems,the paper provides reference for its design and engineering application.In this paper,based on the research achievement of the foamed concrete,the compressive strength and thermal conductivity are controlled within the applicable range of the externally filled wallboards by changing the density.The material is subjected to the cubic compressive strength test,splitting tensile strength test,and prismatic compressive elastic modulus test to understand the basic mechanical properties of the material and obtain the stress-strain constitutive relationship of the material.Using this foamed concrete material,the wallboards with double-layer steel mesh are designed,which are named FLC(Foamed Lightweight Concrete)wallboards.The wallboards are subjected to the bending capacity test,impact test and hanging force test to compared with the codes.The tests results combined with theoretical analysis and finite element simulation help understand the wallboards’ basic mechanical properties.Based on the FLC wallboards,the related structure of self-insulation system of foamed concrete which is suitable for reinforced concrete frame wall is designed.The reinforced concrete frame structure specimens filled with the complete FLC wallboards and the FLC wallboards with the opening were designed,and the low-cycle repeated test of the horizontal load was carried out to understand the damage of the wallboards under the horizontal displacement by the earthquake,and the influence of the FLC wallboards on the RC frame.Based on the test of the structure,the relevant parameters for the contact setting of ABAQUS are obtained through the tensile bond performance and shear bond performance test of foamed concrete and mortar.And the finite element models of the self-insulation system of FLC wallboards are established.The finite element models change the parameters such as the thickness of the wall,the filling area of the wall,and the opening area of the wall to further understand the damage of the wallboard under the horizontal seismic action and the out-of-plane wind load..Based on the above test data and finite element simulation results.The paper gets the theoretical calculation methods of the out-of-plane bending capacity and deflection under the wind load,and calculates the maximum hoisting dynamic coefficient and wind load that the wall panel can bear;This paper also caculates the maximum level of earthquake that the wall panel can bear,and researchs the equivalent diagonal bracing model calculation formula and the diagonal bracing equivalent method which are suitable for this structural system.The research results of this paper not only provide a reliable design and construction basis for the FLC wallboards self-insulation system which is suitable for reinforced concrete frames,but also provide a reference of the use of the FLC wallboards in the area of green energy-saving buildings and fabricated buildings.