| With the rapid development of building industrialization and housing industrialization,the construction project has been developed rapidly.With the concept of building energy saving gradually being paid attention to,the concrete sandwich composite Wallboard is Widely used in the project.Sandwich Wall panel is composed of Wall panel,thermal insulation layer and connector.The existence of thermal insulation layer reduces heat transfer,reduces thermal loss,and significantly improves thermal insulation performance.However,the connectors in the Wall panel Will form a thermal bridge between the inner and outer blade Walls,and heat Will be transferred from indoor to outdoor along the connectors,resulting in the reduction of thermal insulation performance.The performance of connectors of different materials is different,resulting in different thermal bridge effects.Therefore,the connectors have different thermal performance on sandwich Wall panel Performance impact should be the focus of research.Although the "code for thermal design of civil buildings" gives the calculation formula of the thermal bridge loss of sandwich Wall panel With connectors,the correction coefficient of the thermal bridge is not clearly given.Therefore,this paper studies the value of the correction coefficient of the thermal bridge of sandwich Wall panel connectors by theoretical analysis,numerical simulation and test data comparison.The main conclusions are as follows:1.1.Referring to the relevant literature about the structure and thermal principle of concrete sandwich panel,this paper briefly introduces the basic concept of building energy saving and the significance of building energy saving,focusing on the development process of sandwich panel and the research status of thermal performance of sandwich panel at home and abroad.2.The construction,application and construction process of thermomas,stainless steel and peikko connections are introduced in detail.In addition,according to the theoretical calculation formula of the code for thermal design of civil buildings,the thermal performance of different connection content is calculated When the correction coefficient? is 1,and the insulation layer is 3cm,4cm,5cm and 6cm.According to the thermal resistance limit,the thermal performance of different connection content is obtained In the case of a certain thickness of the insulation layer,the limit value of the connector,the condensation of the sandwich Wall panel is also analyzed.3.Based on the thermal principle of the sandwich Wall panel,numerically simulate the heat transfer performance of the sandwich Wall panel.Through comparison With thetest report provided by the National Quality Supervision and Inspection Center,the feasibility and correctness of the numerical simulation have been proved.The thermal performance of the shear Wall in four different Working conditions Was numerically simulated using finite element software.The results shoW that the sandwich Wall panel Without connectors has the best thermal insulation performance,and the thermal bridge loss of stainless steel connectors is greater than that of Thermomass.Connectors,in addition to post-processing the simulation results,draw a line chart of the temperature distribution along the thickness of the plate,providing a basis for temperature deformation and temperature stress analysis.4.Use ABAQUS finite element software to establish the insulation layer thicKness of3 cm,4cm,5cm,and 6cm,and the thicKness of the sandwWich Wall panel is 30 cm.The thickness of the inner leaf Wall remains unchanged at 20 cm.Different numbers of metal connectors are built-in,Which acts under temperature load Then,perform steady-state heat transfer and post-process the simulation results to obtain the total thermal resistance and heat transfer coefficient of the thermal index.The value of the correction coefficient is obtained by comparing With the calculation result of the "Code for Energy Efficiency of Civil Buildings".Through data processing The representative value of the correction coefficient is obtained,and the correction coefficient ? takes a value of 0.9,thereby improving the calculation formula of the thermal resistance of the sandwich Wall panel considering the thermal bridge loss.Based on the analysis results,corresponding suggestions are made for the energy-saving design of the envelope structure.5.By querying the relevant literature on temperature stress and temperature deformation,the temperature on both sides of the Wall panel Was extracted With or Without the connector.It Was found that the overall deformation of the inner leaf Wall Was greater than that of the outer leaf Wall,and there Were joints.The deformation and temperature stress of the Wall panel are larger than the calculation results of the Wall panel Without connector,so it cannot be ignored,and relevant design suggestions are put forward for the influence of the connector on the temperature deformation and temperature stress of the Wall panel. |
