Strengthening of Reinforced Concrete Frame Structures

升级和翻新结构以满足目前的地震标准的需求正在增加，迫切需要业务守则和方法来指导工程师完成这项重大任务。一般情况下，现行建筑规范并不涉及维修和加固问题，维修和加固方案的成功在很大程度上取决于工程师的经验以及整个建筑质量过程。本研究项目将探讨与钢筋混凝土框架结构加固有关的具体课题。这些主题包括与用新混凝土包裹现有混凝土构件相关的剪力传递问题，通过提供钢支撑系统来抗震来增加抗弯框架的强度和延性，通过包裹构件来改善具有弱梁和弱柱的框架的性能，以及通过填充框架结构的单个开间来提供横向抗力。

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.