Experimental investigation of CRC-BRB under cyclic load

支撑框架是钢结构建筑中广泛使用的一种抗侧荷载体系。本文研究的是一种新型的屈曲约束支撑（BRB），其中钢芯由包裹在纤维增强塑料（FRP）套管中的无粘结橡胶砂浆（CRM）支撑。这种支撑系统的优点是它不会像传统的同心支撑系统那样弯曲，并且与常规的brb相比，重量要轻得多。目前，没有制造和设计此类支撑和此类支撑框架结构的指南。提出的研究目的是实验研究牙套的**行为。该结构元件在轴向循环加载试验下的性能将被评估，以确定其滞回行为。**基于性能的设计正在成为抗震设计和结构评估的标准做法，以达到可靠和令人满意的性能水平。然而，目前还没有对这种支撑框架结构及其构件的抗震性能进行研究。这项研究将有助于发展对CRM-BRB行为的正确理解和知识，这将最终帮助我们确定这种支撑框架的抗震性能。本研究将帮助工程师检查整个支撑框架系统在横向荷载作用下不同组件之间的相互作用，并评估其倒塌行为，并确定适当的截面尺寸和连接细节。本研究还将采用有限元方法，在有限元环境下生成活塞杆模型。该模型将首先用支撑的实验结果进行验证。本研究将为此类支撑框架建筑结构及其构件提供基于性能的设计解决方案。这项研究的意义是至关重要的，因为它直接有助于**加拿大钢结构基础设施抵御地震等大横向荷载的安全性。

Braced frames are widely used as a lateral load resisting system in steel buildings. The proposed research deals**with a new type of buckling restrained bracing (BRB) where the steel core is supported by unbonded crumb**rubber mortar (CRM) encased in fiber reinforced plastic (FRP) sleeve. The advantage of such a bracing system**is that it will not buckle like the conventional concentric bracing system and will have much lower weight**compared to regular BRBs. Currently, there are no guidelines for manufacturing and designing such bracing**and such braced frame structures. The objective of the proposed research is to experimentally investigate the**behavior of braces. Performance of this structural element under axial cyclic loading tests will be evaluated to**determine its hysteretic behavior.**Performance-based design is becoming a standard practice for seismic design and evaluation of structures in**order to achieve a reliable and satisfactory level of performance. However, there has been no study on the**seismic performance of such braced frame structures and their elements. This research will help develop proper**understanding and knowledge about the behavior of CRM-BRB, which will eventually help us determine the**seismic performance of such braced frames. This study will assist engineers in examining the interaction**among different components of the whole braced frame system under lateral loads, and evaluate its collapse**behavior, and determine adequate section sizes and connection details. Finite element method (FEM) will also**be implemented in this study where the models of piston brace will be generated in FEM environment. This**model will be first validated with the experimental results of the brace. This study will provide**performance-based design solutions for such braced frame building structures and their elements for the**industries. The significance of this research is paramount as it directly contributes to the safety and security of**Canadian steel building infrastructure against large lateral loads like earthquakes.