Research On Structural Optimization And Temperature Effects Of The Insulation And Decoration Integrated Exterior Wall System

With China's rapid economic development and the improvement on national literacy,energy saving and environmental protection has become an inevitable trend in the development of all walks of life in China.In recent years,China's requirements for building energy conservation have been continuously improved,and a large number of technologies of energy-saving wall have not been able to realize the requirements to save 65%building energy.In this dissertation,the insulation and decoration integrated exterior wall system is a self-insulation system wall,which can meet the requirements of national building energy saving for 65%,shows good thermal insulation performance,convenient construction,and helps to promote the development of the construction industry chain.The insulation and decoration integrated exterior wall system is a multi-layer and multi-material wall.Calculating minimum wall thickness to meet energy-saving requirements according to the relevant regulations of energy-saving design standards for civil buildings.By analyzing the influence of the keel factor in the wall of the system on the thickness of the wall,we derive the limit of the steel content in the unit wall.At the same time,by the Civil Building Thermal Design Specification and one-dimensional heat transfer theory calculation,we analyze the thermal bridge site of the system wall,compare and analyze the condensation temperature of the system wall and the inner surface temperature of the thermal bridge,and propose an optimization program for the thermal bridge node configuration.The insulation and decoration integrated exterior wall system has several pilot projects in Hunan area.We select the gate guard room of Xintang School in Kaifu District of Changsha City as the field test site to monitor the temperature field and strain component of the system wall when pouring foam concrete.We propose the temperature control measures of the foam concrete during hydration to reduce the internal cracks caused by the temperature stress of the system wall when pouring the foam concrete.At the same time,according to the wall heat transfer coefficient of the system measured in the field test,compared with the theoretical calculation of the heat transfer coefficient,we check the minimum wall thickness of the system wall meeting the energy saving requirements.We monitor the temperature field and strain component of the foam concrete under the influence of the most unfavorable high temperature environment on site.Comparing the temperature field and strain component obtained by the finite element simulation model,we verify the accuracy of the finite element model.Through the finite element model for the simulation under the most unfavorable temperature environment,we obtained the weak part of the system wall which is prone to temperature crack in the most unfavorable temperature environment.In addition,we propose the corresponding temperature crack prevention measures.