Temperature And Humidity Effect Under Action Of External Wall Insulation System Numerical Simulation And Test Study

In January2007, the ministry of construction issued No.554document for“construction quality acceptance of building energy conservation engineering”, officiallyGB50411-2007for mandatory standard. China’s civil code building insulation should bedone. Exterior wall thermal insulation technology is used widely, but there are still manyshortcomings and defects, such as crack and heat preservation material loss; Plaster layerdisconnected; Heat preservation material fails to meet the design use fixed number of year,etc. Now, many scholars at home and abroad considered exterior wall thermal insulationsystem for fire prevention, weather resistance, seismic as research subject, research,experiment and numerical simulation analysis and engineering guidance significance forsolution are put forward.Using the numerical analysis software Abaqus, based on heat and mass transfer inporous media, based on the laws of thermodynamics and the law of conservation of energyfinite element numerical analysis model is set up. In temperature field module, write usersubroutine to simulate wall temperature changes, then the temperature results Odb file toimport the stress fields. Analyze the wall structure of different insulation materials,insulation board size and temperature humidity wall. Temperature has proportionalrelationship with stress and the shape variable. Foundation wall has more stress then otherstructure layer; the biggest stress value is about6times of coating decorative surface stress.1#wall stress is smaller than2#. The basis wall of stress and deformation is smaller, moreconducive to the stability of structures, is helpful to prolong the service life of the building.Temperature field numerical simulation result agreed with the test data.For the study of each structural layer of the wall under the condition of seasonal climatechange of the temperature and stress distribution, using exterior insulation system combinedwith the engineering practice and more common heat preservation material, with a largeweathering test, and analyzes the test data. In the process of weather resistance test, when thetemperature is easy to form bubbles, inflation; Environmental temperatures in wall bodyappear the most easily when the appearance of fine lines, the general rule is on the edge ofthe wall stress is larger, and the center is prone to failure. Weathering test has great relevance with actual engineering, used to detect and evaluate the overall performance of the externalwall thermal insulation system, is testing and evaluation of exterior wall thermal insulationtechnology and important way to the performance of heat preservation material.