Application Research Of Roof Greening In The Existing Building Energy Saving

Roof greening is to build on all kinds of buildings and other artificial structures of various green.Roof greening in environmental protection and energy saving aspects of the contribution is rather large,can be more effective to solve the contradiction between the green covering and the construction land,improve the urban living environment,thus effectively balance the social,economic and ecological benefits.Although China began to carry out the research on roof greening technology in 1960 s,but due to the lack of promotion,the system,norms and other issues is not perfect,the popularity of roof greening in our country is not high enough,the buildings have been built more or less problematic.At present,China is in a stage of rapid urbanization,the construction of roof greening in recent years has been rapid development,so the research work of this paper has important practical significance.The content of this paper is as follows:(1)Through a large number of reading and studying the relevant literature,summarized the green roof classification,function,and the status of research and analysis at home and abroad.(2)The finite element method,the finite element theory and the finite element analysis software ANSYS were briefly introduced.(3)On the establishment of frame structure finite element analysis model for the calculation and analysis— green front and rear frame structure displacements,stresses,axial forces,shear forces,bending moments and other static analysis;the first 10 modal analysis;El Centro wave,Shanghai artificial wave and Tianjin Ninghe wave,the total holding of 15 s,in 7 degree seismic intensity dynamic history analysis;temperature field around the green roof analysis.Analysis and comparison of the results of this article can be seen: the added load of roof greening has some influence on the displacement of the original structure,but little effect;Large effects on negative bending moment of the beam-column joints;Node is most prone to damage site;Under seismic bottom-column bottom by force increases obviously;A green layer,significantly reduce the indoor temperature.In summary,green roofs of existing buildings or as little as possible to increase the load on the roof.Long-term consideration,the best option is to combine the roof greening design and architectural design or take appropriate measures for the future afforestation well.Obviously,the domestic has not pay attention to the development of such a comprehensive talent.In addition,used in the analysis of this article is the most simple and ideal cover type greening way,the additional load ideal into a uniformly distributed load on the roof,if the actual conduct of the garden-style green roofs,the load can not even not idealistic,it is necessary to analyze specific issues.