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1、AbstractThestaircaseisoneofthemostfunctionalelementsinmodernbuilding,isthemostcommonandmostcloselybuildingcomponentscontactingwiththeman.Thestructureofthesteelhelixstairislight;itssectionisdistinctlylessthanthatoftheconcretehelixstair;itislightandbeautifulseenintheappearance.Thosegoodch
2、aractersareattachedimportancetopeople.Thesteelhelixstairhasbeenappliedinstructuralengineering,butitstheoreticalanalysisanddesignmethodwerelessstudied・Andtherearenotthedesignmethodsandcorrespondingregulationsinthedesigncriterions.Sothetheoreticalanalysisanddesignmethodofthesteelhelixstai
3、rareofgreatsignificance.Thesteelhelixstairfixedatbothendshasbeenstudied,accordingtothetheoryofthethin-walledstructuresandthebasictheoryoftheforcemethodinstructuralmechanics,andmakingsomereasonableassumptions,thetheoretyanalyticalmodelofthesteelhelixstairsisbuilt,thecalculationformulasof
4、theinternalforcearederived,andthentheprogramiscompiledtocalculatetheinternalforcesofarbitrarycrosssection.Thismethod'sresults,withthecalculationresultsofthesamemodelbuiltinANSYSfiniteelementsoftware,arecomparedtodemonstratethatthedatasoftheinternalforceshaveahighdegreeofaccuracy・Bythewa
5、yofadjustingtheheight,width,innerradius,thicknessofringbeamofthesteelhelixstairs,thevariationoftheinternalforcesisstudiedsystemically,andthefactorsthatinfecttheforceperformanceofthesteelhelixstairsareanalyzed.Basingonthelargeamountofthecalculateddatas,therecursiveanalysisisdone,andthere
6、lationshipsbetweenthemaximumofverticalshearandtorquewiththevariousfactorsaregained,atthesametime,theformulasofthevariousgeometricparametersonthemaximumoftheinternalforcesaregiven.Theseaffordacademicwarrantanddesignmethodtoengineers.KeywordsThesteelhelixstair；Internalforce；Thetheoryofthi
7、n-walledstructures；Geometryparameter；Designmethodin摘要IAbstractII第1章绪论11.1研究背景11.2国内外研究现状21.3选题意义71.4课题的研究内容7第2章板式螺旋楼梯几何模型及截面常数82」板式钢结构螺旋楼梯模型简化82.1.1儿何模型尺寸关系82丄2螺旋楼梯两端的支承情况102.1.3计算的基本假定112.2楼梯正截面及其性质112.2.1楼梯正截面122.2.2截面惯性矩122.2.3正截面的扭转常数142.2.4正截面的主扇性惯性矩152.3本章小结18第3章圆柱形板式螺旋楼梯
