【作者】 高森；

【导师】 王秀丽；

【作者基本信息】 兰州理工大学 ， 结构工程， 2007， 硕士

【摘要】 约束屈曲支撑(Buckling-Restrained-Brace)是一种消能减震支撑体系，内核钢支撑在拉力和压力作用下可以达到充分屈服，具有很好的延性，滞回曲线稳定饱满，而低屈服点BRBs在小位移水平即能屈服耗能，本文将讨论名义屈服点为100Mpa的软钢支撑。约束屈曲支撑目前在日本和美国已被接受和使用，但多用于多高层建筑，在大跨空间网壳结构中的减震性能研究才刚刚起步。而单层网壳结构在一般情况下，尤其是在静力条件下具有较大的刚度，但当跨度增大时，单层网壳结构作为一种位移敏感结构体系，在特定的地震作用下可能产生过大的响应，所以对其进行减震研究是十分迫切和必要的。同时大跨空间网壳结构一般为标志性建筑和重要性建筑，其抗震性能的优劣直接关系到巨大的人民生命和国家经济财产的安全，所以对其进行减震设计具有非常重要的意义。本文将要探讨约束屈曲支撑在单层柱面网壳结构减震中的适用性。本文主要进行了以下工作：一、从柱壳的位移减震率，内力减震率及支撑的耗能情况综合研究BRBs在四边支撑矩形网格单层柱面网壳结构中及四边支撑三向网格单层柱面网壳结构中的适用性，总结出对工程设计有价值的结论和数据，主要包括如何选用BRBs，如何布置BRBs，BRBs减震性能。二、分析影响BRBs在单层柱面网壳结构中减震效果的因素：包括矢跨比和长宽比的影响、核芯钢截面面积对减震效果的影响、网壳自身刚度对减震效果的影响、支撑的屈服强度对减震效果的影响。三、通过带约束屈曲支撑单层柱面网壳结构和不带约束屈曲支撑单层柱面网壳结构静力分析结果、自振分析结果的对比研究带约束屈曲支撑单层柱面网壳结构自振特性变化及在静力荷载作用下刚度、稳定特性的变化。四、分析约束屈曲支撑在两边支撑单层柱面网壳结构中的消能减震效果，并和传统抗震效果做了比较。更多还原

【Abstract】 The Buckling-Restrained-Brace (BRB) is a kind of vibration reduction brace element. Nuclear steel brace can reach full yield under tension and pressure, it takes on better ductility because of the stable and full hysteresis loop of a BRB. BRBs with low yield stress yield and dissipate energy on the small displacement level. In this paper the soft steel brace whose yield point is 100MPa will be discussed. BRBs currently has been accepted and used in Japan and the United States. With more deep study about BRBs applied to multi-story and tall buildings, it is initial starting to apply the study to long-span spatial reticulated shell structures. Lattice shell structrue usually has the larger rigidity especially under static loads,but when the span becomes larger, it may generate oversize response to special earthquake load.Therefore, vibration reduction study abaut it is quite necessary.Specically long-span spatial reticulated shell structures are usually representative and important buildings. Merit and deficiency of seismic design method for these buildings are related to safety of enormous people lives as well as substantial national economy and property. Therefore, significance of vibration reduction design for them is quite obvious. BRBs’applicability for vibration reduction of single layer cylindrical lattice shell structure will be studied in this paper.The main content are as follows:(1)、 Based on three factors— vibration reduction rate about inner forces, vibration reduction rate about displacement and energy dissipation capability of BRBs, BRBs’applicability for vibration reduction of single layer cylindrical lattice shells supported at four sides will be discussed and researched .Conclusions and data valulable to engineering design are drawn ,the main ones of which are as follows: how to sellect BRBs, how to arrange BRBs, vibration reduction performance of BRBs.(2)、 Analyze influencing factors for vibration reduction performance of BRBs. Influencing factors consist of the ratio of height to span , the ratio of span to length, cross sectional area of nuclear steel brace, stiffness of shell itself and yield stress of BRB.(3)、 Compared by single layer cylindrical lattice shell without BRBs , rigidity,stability under static loads and self-oscillation performance of the single layer cylindrical lattice shell with BRBs will be researched.(4)、 Analyze vibration reduction performance of single layer cylindrical lattice shells supported at two sides with BRBs and compare vibration reduction effect by the traditional earthquake-resistance effect.更多还原