Exterior Insulation System Of Earthquake Analysis

The percapita availability of energy in China is lower than half of the average level in the world. To realize sustainable development of economic society, Chinese government has paid enough attention to the aspect of building enery conservation, especially for the'Energy saving medium-long term special planning'. It has been clearly stipulated that the energy saving standard and transformation should be strictly carried out in the new and existing bulidings, respectively. At present, exterior wall external insulation system is widely used in our country. But, there is less study on safety of exterior wall external insulation system under earthquake action. Thus, it is of great practical significant on asismic analysis of exterior wall external insulation system. Based on theoretical and FEM methods, the present paper investigates the elastic and elastic-plasic response of exterior wall external insulation structure under frequently and rare occurred earthquake. The following conclusions can be drawn:(1) Based on the proposed mechanic model of exterior wall external insulation system, the corresponding motion equation is deduced under earthquake action, and a time history program is also developed by Matlab software.(2) The insulation system can increase the vibration periods of structure modes and should be taken into serious consideration.(3) A time history analysis of exterior wall external insulation system under frequently occurred earthquake is carried out. The results show that the maximum earthquake action occurs at the mid-floor of the main structure; the maximum acceleration of insulation system at every floor is much bigger than that of the main structure; the maximum displacements of both main structure and insulation system are occur at the mid floor, and the maximum relative displacement between main structure and insulation system is on the top floor.(4) The maximum displacement and acceleration of insulation system at every floor decreases gradually with increasing the structure stiffness. There is no significant influence of the mass of insultion system on the maximum displacement of main structure and insulation system at every floor. The maximum acceleration of insulation system will increase due to the greater mass of insulation system, but mass of insulation system has no effect on the maximum acceleration of main structure.(5) A FEM analysis on the overall structure under the action of rare occurrence earthquake is finished. The results show that the top floor has the maximum elastic-plastic displacement of the main structure; however, the maximum elastic-plastic displacement of the insulation system occurs at the mid floor. In addition, the maximum relative displacement takes place at the upper floor.