Study On Mechanical Performance Of New Type Sandwich Thermal Insulation Plate With Truss

At present,China's construction industry has problems such as low labor productivity,low energy conservation and environmental protection,and low quality assurance rate.These problems are mainly related to the on-site construction methods of China's construction industry.Therefore,China has begun to vigorously promote the industrialization of construction.Industrialization of buildings can not only improve construction efficiency,shorten construction period,but also ensure project quality,energy conservation and environmental protection.In the process of industrialization of buildings,precast concrete structures are an important part of achieving their goals.In-depth research on precast concrete structures in China is increasing.Prefabricated concrete sandwich insulation wall panels as an integral part of the prefabricated concrete structure system play an important role in the implementation of building energy-saving construction.Improving the insulation performance of wallboard and improving the performance of new insulation walls is an important part of promoting the industrialization of buildings.The precast concrete sandwich insulation wall board has the advantages of low "heat bridge" effect,good durability,simple construction process and less environmental pollution.At present,there are few studies on precast concrete sandwich insulation wall panels at home and abroad.The main types of joints are few,the research on the mechanical properties and influencing factors of the shear resistance of wall panels are less,and the combination of wall panels and impacts There are few research on effect factors,so the in-depth study on precast concrete sandwich insulation wall panels is of great significance for the development of China's building industrialization.In this paper,the bending test and shear test of the new sandwich thermal insulation wallboard specimens with stainless steel truss ribs as joints are carried out to study the mechanical properties,influencing factors,joint force performance and combination effect of the new wall panels.In the case of the thickness of the insulation layer and the thickness of the concrete,four bending specimens and two shear specimens were designed and fabricated.The failure process and failure mode of the specimen under the external static load were observed.Load strain curve,load displacement curve and distribution and development of cracks.At the same time,the finite element numerical simulation of ABAQUS was carried out,and the simulation results were compared with the experimental data.The calculation results show that the experimental data is basically consistent with the finite element simulation,thus verifying the accuracy of the test results and the feasibility of the simulation method.On the basis of the number of connectors,the ABAQUS finite element simulation is used to study the influence of the number of joints on the mechanical performance of the new sandwich insulation wallboard with truss ribs.The main research contents of this paper are as follows:The design of the test component and the static loading test were first carried out.The test consists of two parts: the bending test and the shear test.By observing the failure process of the test piece during the loading process,the failure mode,the load strain curve,the load displacement curve,and the distribution and development of the crack,the core insulationwall panel is The performance of the force was studied.The variables of the four sandwich insulation panels of SWC-1,SWC-2,SWC-3 and SWC-4 are the thickness of the insulation layer and the thickness of the concrete slab.Tests show that as the thickness of the concrete slab increases,the bearing capacity of the sandwich insulation board increases,the degree of deflection occurs,and the stronger the deformation resistance,the combined effect will also decrease.As the thickness of the insulation layer increases,the load-carrying capacity of the sandwich insulation board decreases slightly,and the degree of deflection is slightly larger,but the degree of influence is small,and the effect on the combined effect is small.At the same time,the variation of the two sandwich insulation boards of SWS-1 and SWS-2 is the thickness of the insulation layer.The results show that with the thickness of the insulation layer,the bearing capacity of the sandwich insulation board is less affected,but the relative of the inner and outer concrete slabs The displacement has a large effect.Then the ABAQUS finite element software was used to analyze the finite element simulation of the six specimens of the shear test and the bending test,and compared with the experimental data.The calculation results show that the test data is basically consistent with the finite element simulation.The accuracy of the test results and the feasibility of the simulation method were verified.Then,in order to further study the mechanical performance of the new sandwich insulation board using truss ribs,based on the experimental simulation,the finite element software ABAQUS was used to simulate the influence of the number of joints on the mechanical performance of the sandwich insulation board.The simulation results show that the flexural capacity,ductility and load carrying capacity of the new sandwich insulation board with truss ribs for the thinner concrete are increased with the number of joints.Large;but for the thicker concrete slabs,the new sandwich insulation board with truss ribs,with the increase of the number of connectors,the load capacity is less increased,but the flexural resistance and ductility are greatly improved.Finally,the research contents and main results of this paper are analyzed and summarized,which provides the basis for the actual engineering design in the future,and proposes the research direction and prospect.