The Study Of Cohesive Strength Of Decorated Tiles On The Exterior Wall Insulation System

EIFS(Exterior wall insulation system ) is a structure power-saving technologywhich was first bore in Europe in BC.17.After last century 's oil crisis EIFSgradually achieve more attentions .Lately with a few decades development it isbecoming more mature .With the population of structure energy conservation athome , EIFS was introduced into our country and is developing in the use .Now,engineers both at broad and at home have taken relatively in-depth researches in eachterm performance of EIFS ,but lots of them focus on the heat retaining ability and theweather ability , few on the cohesive strength of decorative tiles on EIFS and thecohesive strength security under earthquake effect and wind load . This article take the most population exterior wall insulation system at home:wire mesh frame filler polystyrene broad exterior wall insulation system for example,through static test ,simulated earthquake vibration table test and finite elementanalysis by the ANSYS software, relatively in-depth study the cohesive strengthbetween the decorative tiles and polystyrene broad under the horizontal directionload and the elevation direction load . The results of the static test show the cohesive strength between the commonfinishing bedding mortar and polystyrene broad is the weakest layer of the cohesivestrength of the exterior wall insulation system .For the cohesive strength in thedirection normal to wall face ,because the eventual failure is the finishing beddingmortar destroy ,the distortion of the wire mesh frame and the L－type steel bars aresmall, the reinforced effect of wire mesh frame and the L-type steel bars to enhancethe cohesive strength is weak. For the cohesive strength in the direction parallel to thewall face ,because in this direction the caking ability between the finishing beddingmortar and wire mesh frame is satisfactory ,when the finishing bedding mortar slipafter the cohesive failure with the polystyrene broad ,it would make wire mesh frameand the L-type steel bars happen prodigious flexural deformation. So, the failure inthis direction can make full use of the material strength of wire mesh frame and the III北京工业大学大学工学硕士学位论文L-type steel bars. While after either direction failure the wire mesh frame andL-type steel bars can prevent the finishing bedding mortar and decorative coat fellingdown and injuring human. The results of vibration table test show that because the angular rigidity ofthe wire mesh frame filler polystyrene board is great ,result in the entire exteriorwall insulation system 's natural vibration frequency is also great, it is greater thanthe structures'natural vibration frequency and the main frequency of the earthquake.In the earthquake, exterior wall insulation system of wire mesh filler polystyrenebroad and the decorative tiles on it make the synchronized motion with buildings. Itneed not consider the dynamic coupling effect. The load putting on the decorative tilessticking to the wire mesh frame filler polystyrene board in the earthquake is thebuildings'dynamic output under the earthquake effect. The decorative tiles were notunstuck and fell off under the shock of the earthquake wave of 0.1g,0.2g and0.4g. At last this article discussed the calculating method of the earthquake effect andthe wind load according to the codes of the people republic of China; Simulatingthe static test by using finite element analysis software ANSYS, comparing the resultsof numerical simulation with the result of static test.