Strengthening of Reinforced Concrete Frame Structures

为了满足当前的地震标准，对结构进行升级和改造的需求正在增加，迫切需要制定实践规范和方法来指导工程师完成这项大型任务。一般来说，目前的建筑规范没有解决维修和加固问题，维修和加固方案的成功高度依赖于工程师的经验以及整体施工质量过程。本研究项目将探讨与钢筋混凝土框架结构加固相关的具体课题。这些主题包括与用新混凝土护套现有混凝土构件相关的剪切传递问题，通过提供钢支撑系统来抵抗地震荷载来增加抗弯矩框架的强度和延性，通过护套构件来改善具有弱梁和弱柱的框架的性能，并通过填充框架结构的单个孔来提供横向阻力。

The demand for upgrading and retrofitting structures to meet current seismic standards is increasing and there is a pressing need for codes of practice and methodologies to guide engineers in this large task. Generally, current building codes do not address repair and strengthening problems and the success of repair and strengthening schemes is highly dependent on the experience of the engineer as well as the overall construction quality process. This research project will address specific topics related to the strengthening of reinforced concrete frame structures. These topics include shear-transfer problems associated with jacketing existing concrete members with new concrete, increasing the strength and ductility of moment-resisting frames by providing a system of steel braces to resist earthquake loads, improving the performance of frames with weak beams and weak columns by jacketing the members, and providing the lateral resistance by infilling single bays of frame structures.