Dynamic and Static Stability and Safety Limitations of Lift Slab Structures

升降板结构的动静态稳定性及安全限制

• 批准号: 9504541
• 负责人: Rusk Masih
• 金额: $ 5.09万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-10-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9504541&HistoricalAwards=false
• 关键词: Dynamic; Static; Stability; Safety; Limitations

9504541 Masih Theoretical evidence as well as practical accidents have pointed out that under certain loading conditions the lift-slab structures are at the threshold static and dynamic instability. The instability of the structure is created by stacking the heavy mass of several slabs at high levels, while the structure cannot be braced laterally, since the bracing will inhibit the lifting process. During construction stage or under lateral loads, such an instability situation becomes highly undesirable. This project undertakes an investigation to the limitations within which the structure remains statically and dynamically stable. The project would also include a study of the ways and means of the safety precautions used and necessary recommendations to improve them. Theoretical studies to improve the design of lift-slab structure, performance against earthquake forces, and to recommend ways to strengthen the existing lift-slab structures to withstand possible future earthquakes will be conducted. Such improvement should help to avoid tragedies like those which happened in Armenia during the 1988 earthquake. Computer analysis will be made to study limitations as: the stacking schemes of the parked slabs, the safe relationship of those schemes with the geometry of the structure, the limits of safe dynamic load and its frequency to maintain safe lifting process, and the safe temporary connection of the parked slab to the columns. ***

9504541 Masih理论证据和实际事故都指出，在某些载荷条件下，升板结构处于静态和动态不稳定的阈值。 结构的不稳定性是由在高水平处堆叠几块板的沉重质量造成的，而结构不能横向支撑，因为支撑将抑制提升过程。在施工阶段或在横向载荷下，这种不稳定情况变得非常不希望。 该项目对结构保持静态和动态稳定的限制进行了调查。 该项目还将包括研究所采用的安全预防措施的方式和方法以及改进这些措施的必要建议。 将进行理论研究，以改进升板结构的设计、抗震性能，并建议加强现有升板结构以承受未来可能发生的地震的方法。 这种改善应有助于避免类似1988年亚美尼亚地震时发生的悲剧。 将进行计算机分析来研究限制因素，例如：停放板的堆叠方案、这些方案与结构几何形状的安全关系、维持安全提升过程的安全动载荷及其频率的限制，以及停放板的安全临时连接到柱。 ***