【作者】 周霆；

【导师】 潘家鼎；

【作者基本信息】 西南交通大学 ， 结构工程， 2003， 硕士

【摘要】 在高层、超高层框架—筒体结构中设置水平加强层，是提高结构的抗侧刚度，减小结构在水平荷载作用下的楼层位移，降低筒体弯矩的有效手段，在实际工程实践中得到了广泛应用。确定加强层设置方案的理论很多，其中最有代表性的是B.S.Smith由平面模型推导出的加强层最优设置理论。本文依据此理论，对一框架—筒体结构，按不同的加强层设置方案，进行了空间有限元动力分析，做了以下几方面的研究： (1) 采用大型通用有限元分析软件ANSYS，依据有限元理论，选取合适的单元模拟结构各构件，建立起结构有限元分析模型。 (2) 对结构有限元模型进行模态分析，比较和总结了不同加强层设置方案下，结构自振特性的变化。为进一步动力分析打下基础。 (3) 采用振型分解反应谱法对结构进行水平地震动的动力分析，比较和总结了不同加强层设置方案下，结构的位移、内力的地震响应。分析了加强层对结构地震响应的影响。为此类结构的抗震设计提供了一定的参考依据和建议。 (4) 在对结构进行抗震动力分析的基础上，通过具体详细的定量分析研究，总结设置加强层对结构内力分配的影响规律，探讨水平加强层减小结构侧移、提高抗侧刚度的机理。 (5) 提出了实际工程设计中，确定加强层设置位置的建议，并给出了该结构模型设置一道水平加强层的最佳位置，可供相近工程实际参考。更多还原

【Abstract】 Outrigger-braced structures as a modification of framed-tube structures is widely used in high-rise buildings, for it has a outstanding merit to improve the lateral stiffness, reduce the floor displacement and lessen the moment of the tube. Many theories on this aspect have been put forward. Among these theories, the most representative one is professor B. Stanford. Smith’ s theory, which was made out from a planar model. Based on this theory, the thesis conducts a space dynamic analysis on a framed-tube structure that has different belted outrigger plans. The main contents of the analysis are listed out as below:(1) On the basis of the FEA theory, uses the general FEA software ANSYS to set up a structure model.(2) Through the modal analysis, compares and sums up the change of the free vibration characters of the model under different belted outrigger plans.(3) By the means of response spectrum analysis, conducts horizontal seismic analysis to the model. Compares the force and displacement of the model under different belted outrigger plans. Then, gives suggestions on seismic design of the outrigger-braced structures.(4) From the results of the seismic analysis, try to probe the rule that how the belted outrigger works to reduce the displacement and improve the lateral stiffness.(5) Put forward advices on locating the optimum position of the belted outrigger. Moreover, gives the optimum position, when only one belted outrigger is to be settled.更多还原