Study On Thermal-insulation Of Sandwich Board And Fireproof Performance Of Container Building

The container building is a green assembled building assembled and transformed by containers.Compared with the traditional building form,it has the characteristics of short construction period,high construction efficiency,saving resources,manpower and environmental protection.However,the container is the all-steel structure,the thermal conductivity of the steel is strong,and the mechanical properties of the steel at high temperatures are very different from those at room temperature.The thermal-insulation and fire proof of the container are poor.Therefore,it is necessary to improvement the enclosure structure for fireproof and thermal-insulation requirements of the building.At present,most domestic scholars focus on the analysis of the overall mechanical properties of the container building.The studies on the thermal-insulation performance and fire proof of container building.This paper has done the following research for such problems:(1)Establishing a container building insulation sandwich panel model through the finite element software ABAQUS,Insulation sandwich panels of different materials and thicknesses are studied.The simulated internal analysis of sandwich panels in the hot summer and cold winter regions,cold regions,and severe thermal conditions under three thermal conditions,the internal temperature field of the sheet under the influence of winter temperatures.the best insulation thickness of the insulated sandwich panel in different thermal conditions is obtained.For example,the best insulation thickness of the polyurethane sandwich panel in a severe cold area is 60 mm,and the best insulation thickness of the rockwool sandwich panel is 100 mm.(2)Using the harmonic method under instable heat transfer with periodicity.Sandwich panels with different combinations of three surface layers and two core layers are studied.The calculation results show that among the three surface sandwich panels,the calcium sandwich panel has the largest attenuation ratio and good thermal insulation performance.With the different layers of sandwich panel,the attenuation factor of the sandwich panels are different,and the thermal insulation performance cannot be judged solely by the thermal inertia index,and the attenuation factor and the delay time need to be considered.(3)Considering that the actual fire situation of the container is quite different from the standard fire,use the fire simulation software FDS to build a container building fire model.Get the actual fire temperature curve of the container house.Analyze and simulate the distribution of indoor temperature under actual fire.The fire temperature at real temperature curve obviously is lower than the temperature at standard temperature curve,showing the scientific and importance of using performance-based fire protection design in structural fire resistance design.(4)Using the finite element software ABAQUS to establish a model,six-story container with the fire protection of the beam-column and no fire protection of the enclosure protection is studied.Two kinds of fire loads of actual indoor fire and international standard fire simulated by FDS software were loaded on the bottom layer of the container building respectively,and the thermo-mechanical coupled response results of the structure subjected to static load and fire at the same time were obtained.The stress and deformation of container building components under two fire conditions are analysis.When six-story container building was fired on the ground floor with the beam-column being fire protection and the enclosure protection being fire unprotection of.The fire resistance limit under the standard fire temperature curve was 40 min,and the fire resistance limit under the actual heating curve was more than 1 h.