Study On The Influence Of Tridimensional Virescence On Building Structures

With the rapid development of urbanization in our country, the conflicts of city construction land and green land have become increasingly prominent, and the development of tridimensional virescence construction is imminent. Tridimensional virescence building has the advantages of less area occupation, large green area, quick greening effect. The research of building the tridimensional virescence has great practical significance to relieve the lack of local land and to improve the urban ecological environment.From the view of the two aspects of tridimensional virescence, roof greening and vertical greening, systematic analysis of tridimensional virescence building system is carried out by collecting, consulting, sorting and analyzing related data, and the light, medium and heavy green roof types are proposed. By analyzing the construction practices of three kinds of roof greening, it’s found that the construction method can be further improved, and then the optimization measures of structure are put forward. In order to grasp the influence of the structure layer on the energy-saving performance of the roof, the thermal parameters are calculated and it’s found that the thermal insulation layer and the substrate layer of roof greening energy plays a decisive role. The influence of the change of thermal insulation layer and the substrate layer thickness on the energy-saving performance of the roof is analyzed, and the options of the thickness of insulation layer and the substrate layer are puts forward.In order to further study the influence of the construction of tridimensional virescence green on structure safety, the loads of light, medium and heavy roof greening are calculated, and it’s found that compared with ordinary accessible roof load, the greening load with light, medium-sized and heavy type green roof increases by 11%, 38% and 83% respectively. Combined with the instance parameters of masonry structure, frame structure and frame-shear structure, the effects of three kinds of roof greening load and modular, bag type vertical greening loads on structural internal force are estimated. The results show that compared with ordinary accessible roof, the roof beam and plate bending moments of the light, medium and heavy roof green increase by about 10%, 39% and 83% respectively, modular and bag type of vertical greening cause the bottom column and wall axial force increase about 8.15% and 4.34% respectively, which show that the medium and heavy roof greening and modular vertical greening have great influence on the internal force of the building structure, while the influence of the light roof greening and the bag type vertical greening on the internal force is relatively small, which can be further applied. Based on the above research conclusion, combined with the practice project of the construction of a parking garage, by using finite element software PKPM, the models of the three kinds of roof greening are established and the effect of three kinds of roof greening load on the building structure are analyzed, the results are basically consistent with the estimation, and the theory model of bearing capacity load ranging within the greening scope are put forward.In conclusion, the study on the influence of tridimensional virescence on the structures not only can provide solutions for tridimensional virescence design, but also provide theoretical support for the development of related technology of domestic green enterprises, as well as promote the construction of ecological city in our country.