EPS板薄抹灰外保温系统一阶模态仿真分析

First Mode of Vibration Simulation Analysis of External Thermal Insulation System of Thin Plastered EPS Board

采用Abaqus有限元分析软件,对EPS板薄抹灰外保温系统的一阶模态进行分析。模型中,EPS板平面尺寸为600 mm×1200 mm,厚度为25 mm或30 mm。技术标准规定,应保证EPS板与基层墙面的粘结面积不小于保温板面积的40%。因此,有限元模拟时,考虑了胶黏剂的面积和数量。同时,比较了模型是否建立墙体的差别。通过仿真分析发现,一阶频率可表征空腔面积或胶黏剂“粘结饼”数量的影响;胶黏剂“粘结饼”数量越少,对应的空腔面积越大,系统的一阶频率越小。30 mm厚EPS板薄抹灰系统一阶频率比25 mm厚系统稍高;建墙与不建墙模拟结果接近,仿真模拟时可不建墙。因此,EPS板施工时如有虚粘,系统的一阶频率会变小,可通过实测并比较一阶频率来定量判断EPS板的粘贴质量,为新无损检测方法提供了可能性。

Abaqus finite element analysis software is used to analyze the first-order mode of vibration of EPS thin plastering external insulation system. In the model, the planar size of EPS board is 600 mm×1200 mm, and the thickness is 25 mm or 30 mm. The area and quantity of adhesive disc are considered in the finite element simulation. According to the technical standard, the bonding area between EPS board and base wall should not be less than 40% of the total area. Meanwhile, the difference between the wall model and the non-wall model is compared. The simulation results show that the first frequency can indicate the influence of cavity area or the number of “adhesive cake” quantity. The less the “adhesive cake”, the larger the corresponding cavity area and the smaller the first frequency. The frequency of the thin plastering system of 30 mm thick EPS board is slightly bigger than that of the 25 mm thick system. The simulation results of building walls are close to those without walls. So, it can be built without walls during simulation. Therefore, if there is excess cavity, the first frequency of the system will be smaller. It can be used to quantitatively judge the bonding quality of EPS board by comparing the first frequency, which provides the possibility for new nondestructive testing method.