| I . The purpose and the meaning of researchAlong with the development of the our country, city needs more and more high office budilings in recent years.In the every kind of high structure system, for framed-tube structure system,the ability to resist lateral force is stronger than others. And easily form the great space to use , so it was usually made use of high office budilings .But to the normal framed-tube structure system, because the first floor cover the area general dose not big, and the perpendicular and level the public transportation area of each story is big, therefore in deed the area of each story to use is small,at a certain degree it limits plenty of using of the building.The purpose of researching the tall building structure system possessed double helix-cantilever trusswork is make use of the cantilever wing part making the each story 's area increasing 40-50%, so reduce proportion to occupy for the transportation area and assistant area, increasing the rate of utilization, so can own better economicbenefit.The meaning for research of this task: ?structure aspect, this project must adopt the circular flat tube structure for double helix structure.This kind structure system's carrying capacity is oppositely best, not only avoided the problem of shear forcet lagging in the rectangle framed-tube structure system inevitably existent, but also nonexistent suffer the most disadvantageous colum of the corner.Cantilever structure is really to increase the vertical loads for framework columns belong to outside framed-tube, making the outline pillar under the force of wind or earthquake force does not easily appearing the oneself suffering pulling of frame pillar lying to the outline tube , to be beneficial to the overall structure.(2) building aspect, this project of the design conceive outline special, the shape is novel, and can be used as the city marking building, and enrich the skyline of a town, not only as the city's landscape point, but also be used as the sky deck in the city.The cantilever part is used as a basic office unit, area is just right, can adopt good and natural light, visual field vast, each unit has near 80 m2 sky garden, in the tall building truly hard to comeby.From the real estate industry to see, it also has very big attraction and competitionability.II. The content and the method of researchIn this paper, basic mechanical unit of cantilever structure for researching is an open-web trusswork of combining, open-web truss abroad also call the Vierendeel truss, it belong to rigid frame most carrying bending moment, and at the same time contain trusswork characteristics.The target and contents of this task researching is make use of the computer to proceed precisely analyzing to double helix candilever open-web trusswork of combining, finding out the part that illogicality in the mechanics model, proceeding having aim at special part request with bring up the own first step way, in order to together argue and improve with others;For double helix framed-tube tall building structure proceeding analysis calculation to the overall building, to calculation result(each member's internal force and movement after earthquake function) proceeding tally and inducing, then can attain proceeding actual design of engineering request, the calculating under the wind loads this thesis does not study temporarily. For this, intend the solution below key problem:(1) Reasonably choose the type of the tali building structure system and each member's first size, must satisfy correspond to building structure norm and the request of term construction.(2 ) Make use of the finite element software ANS YS to proceed to the structure unit chosen the calculation analysis;Make use of other many high building space structure analysis software as SS, SSW and TBSA,proceed to the overall structure with calculation analysis.( 3 ) Through the contrast of the computer result and actual request, assess the possibility of the system of this kind new building structure;The special build...
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