Seismic Retrofit with Energy Dissipators

该项目由NSF资助。 第90-23号公告“修复和 抗震加固研究 的结构。" 使用螺栓在槽孔中进行的试验， 贝尔维尔弹簧垫圈具有良好的 严重灾害期间的能量耗散潜力 滑移循环荷载 板表面。 这些测试表明， 多次重复滞后行为 负载反转，例如可能发生在 严重地震。 连接处的滑动 发生在滑动临界剪切力上， 螺栓. 因此，可以准确地 设计支撑和其他元素， 它们不会在外力下弯曲或屈服 是由地震引起的 这将 消除最不受欢迎的行为 发生在传统设计的钢 振奋精神 在这个项目中，早期的研究将是 扩展到更大范围的螺栓尺寸， 循环荷载的类型。 的行为 循环下连接处的几个螺栓 还将研究负载。 后 分析这些结果，模型测试框架 在桌子上进行实验的设计。 能源实用设计程序 耗散连接及其范围 适用性将通过测试 模拟地震荷载的框架。 它 预计拟议的系统将利用 传统的制造过程将 对于实际应用而言， 应用.

This project is supported under NSF Announcement No. 90-23 "Repair and Rehabilitation Research for Seismic Resistance of Structures." Pilot tests using bolts in slotted holes with Belleville spring washers show an excellent potential for energy dissipation during severe cyclic loading due to slip between faying plate surfaces. Such tests indicate stable repetitive hysteretic behavior during numerous load reversals such as may occur during a severe earthquake. The slip at a connection occurs at a slip-critical shear force on the bolts. Therefore it is possible to accurately design braces and other elements such that they would not buckle or yield under forces caused by a seismic event. This would eliminate the most undesirable behavior occurring in conventionally designed steel bracing. In this project the earlier studies will be extended to a larger range of bolt sizes and types of cyclic loading. The behavior of several bolts at a connection under cyclic loading will also be investigated. After analysis of these results, a model test frame for experiments on the table will be designed. Practical design procedures for energy dissipating connections and the range of their applicability will be developed by testing the frames with simulated earthquake loadings. It is expected that the proposed system utilizing conventional fabrication procedures will be exceptionally cost effective for practical applications.