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为研究在预期损伤部位采用纤维增强混凝土(FRC)和柱梁端受弯承载力比对框架结构破坏机制的影响,设计了5个带有翼缘板的不同柱梁端受弯承载力比值的梁柱组合体,其中4个试件的预期损伤部位采用FRC材料增强,1个试件全部采用普通混凝土。通过对试件进行拟静力试验,分析其破坏机理、变形和耗能性能以及承载力等。研究结果表明,与普通钢筋混凝土梁柱组合体相比,预期损伤部位采用FRC梁柱组合体的峰值荷载提高了13%,极限层间侧移角增大了17%,总耗能提高了40%,抗损伤能力明显提高;考虑梁两侧各6倍板厚翼缘宽度内钢筋对梁端弯矩的影响,当柱梁端受弯承载力比为1.2时,可基本实现强柱弱梁破坏机制,当比值为1.4时,可完全实现强柱弱梁破坏机制。
In order to study the influence of FRC and failure ratio on the failure mechanism of frame structure at the expected damage location, the ratio of flexural bearing capacity of five columns with flange plates was designed The combination of beam and column, where the expected damage site of 4 specimens is reinforced by FRC material, and 1 specimen is made of ordinary concrete. Through the quasi-static test of the specimen, the failure mechanism, deformation and energy dissipation performance and bearing capacity are analyzed. The results show that the peak load of the FRC beam-column combination is expected to increase by 13% compared with that of ordinary reinforced concrete beam-column assemblies, and the ultimate displacement angle between layers increases by 17% and the total energy consumption by 40% %, The damage resistance is obviously improved. Considering the influence of the steel bar on the bending moment of the beam at the width of 6 times the thickness of the flange on each side of the beam, when the bending bearing capacity ratio at the column end is 1.2, Damage mechanism, when the ratio of 1.4, can fully achieve the strong column weak beam failure mechanism.