十字形平面结构在水平地震作用下的扭转效应分析结构工程专业论文.docxVIP

摘要摘要 摘要 摘要 随着人民生活水平日益提高和社会发展的需要，体型不规则、结构不对称 的建筑结构日益增多。在地震作用下，这些类型的结构由于体型复杂(如平面形 状复杂的十字形、L型、T型等建筑，楼梯间、电梯问偏于平面的一侧或一角 的建筑等)或楼层质量和刚度分布不对称，楼层的质量中心和刚度中心不重合， 使得在地震作用下结构不仅有水平振动，同时还有扭转振动，并且平扭耦联， 造成结构出现较大的动力反应，危及结构安全。 本文对结构扭转振动的研究现状和必威体育精装版研究成果进行了综述分析，详细介 绍了影响结构扭转效应的三个因素：偏心距、扭转刚度、平扭周期比和评价结 构扭转效应的三个参数：扭转角、最大层间位移和项层最大位移及剪力系数。 利用结构分析的有限元方法，对影响结构扭转效应的三个因素进行了研究， 分析了结构的扭转刚度、尺寸效应、双向地震、偏心距、平扭周期比等参数对 十字形单层结构扭转反应的影响。 从十字形平面多高层建筑结构模态分析入手，研究了扭转刚度、拉接楼板 拉接梁、均匀刚度偏心和局部刚度偏心、质量偏心距等因素对十字形平面多高 层建筑结构的扭转影响。 最后，通过对上述分析结果进行分析和整理，给出了一些可以供实际工程 设计参考的建议。 关键词：十字形平面、扭转效应、偏心、扭转刚度 AbstractABSTRACT Abstract ABSTRACT With the improvement of the people’S living standard,the building structures with irregular and asymmetry plans have been increasing．Under the earthquake conditions， as the structure is complex(the asymmetry buildings，for instance，the buildings whose plan shapes are complex type cross，type L，type T or etc)，and the floor center of mass and the center of rigidity is mismatching，the structure would not only has the horizontal vibration，but also has the torsional vibration，lateral—torsion coupling．And the coupling reaction of the torsional and the lateral vibration will lead to more harder seismic response which harms the structures． This paper analyzes the three factors infl uencing torsional effect：eccentricity, torsional rigidity,lateral-torsion period ratio，and the three parameters that used for evaluating structural torsional effect：torsion angle，max relative storey drift and the max displacement at the top floor and coefficient of shear． By using the computational soRware for structure analysis，the three factors influencing torsional effect of single—story buildings al e studied and the torsional rigidity,size effect,duplexing earthquake，eccentricity,lateral torsional ratio that effects the cross single—storey structure are analyzed． Through the analysing of the mode of cross plane multi-story and hi．gh-rise buildings，the torsional rigidity,widening floors and beams，regular stiffness eccentricity an