当前，钢筋混凝土（RC）框架结构面临两大挑战：在地震中“强柱弱梁”机制难以实现，由于水平构件拉结不足而产生局部破坏引起的连续倒塌。本项目提出了一种采用起波钢筋局部削弱/增强的新型RC框架结构：起波钢筋具有双台阶状的受力性能，布置在框架梁约1/4跨处，可使此处的局部抗弯承载力削弱但变形能力增强。此构造既能使框架实现“强柱弱梁”，又能在不显著增加造价的情况下同时提高结构的抗震性能和抗连续倒塌能力。将针对此进行一系列研究：①构造方面，研究起波钢筋本构及其与混凝土和箍筋的相互影响；②构件方面，研究起波钢筋梁的静力和滞回性能；③结构方面，研究新型框架结构的抗震和抗连续倒塌性能。将通过试验、数值模拟和理论分析，最终将建立采用起波钢筋局部削弱/增强的新型RC框架结构的设计方法。本项目力图发展RC框架结构的设计理论、解决关键技术难题，为结构抵御多灾害的能力提升提供经济有效的技术手段。

Currently, there are two threats to the design of reinforced concrete (RC) frame structures. One is the difficulty of realizing the "strong column-weak beam" when the structure is subjected to seismic load. Another is the progress collapse caused by local failure due to the weak tie force of horizontal members. A novel RC frame structure with weakening / enhancing of kinked rebar is proposed in this project. The kinked rebar has a tensile load-deformation relationship with two plateaus. When the kinked rebar is located at the 1/4 span of the frame beams to weaken the local flexural capacity and enhance the deformation capacity, the "strong column-weak beam" will be realized in the RC frame, the seismic performance and the progressive collapse resistance are improved simultaneously without increasing cost as well. This study includes the following parts. For the dealing, the constitutive relation of the kinked rebar and its interactive effects to concrete and stirrups will be studied. For the member, the static and hysteretic behavior of the beam with the kinked rebar will be investigated. For the structure, the seismic performance and collapse resistance of the novel RC frame structure will be analyzed. The design approaches of the proposed frame structure will be built up based on the experiments, numerical simulations and theoretical analysis. This project aims to develop the design theory and solve the technological problems of RC frame structures, thereby improving the ability to withstand multi-hazard sources economically and effectively.