论文部分内容阅读
既有建筑的抗震性能评估中,钢筋混凝土构件的转动能力评估是一个关键问题。在现代安全评估体系中,必须进行抗震需求和抗震能力的比较。然而,可采用的性能模型只能反映允许钢筋变形的新结构的试验结果,其变形和强度机制并非必须反映旧构件的响应。众所周知,按照旧规范设计的钢筋混凝土构件,通过不同的结构细节、不完善的约束、光面钢筋和混凝土之间弱的粘结来描绘其特性。与新结构相比,出现了不同的屈服后机制。根据意大利1940-1970年的指南设计了光面钢筋混凝土柱,并报道其第二阶段试验结果。在循环荷载下,对构件的研究结果清楚地显示了在转动能力发展过程中弱粘结的作用。相关的研究涉及柱的单调响应和由欧洲规范8规定的经验公式所确定的弦的转动。
In the assessment of the seismic performance of existing buildings, the assessment of the rotational ability of reinforced concrete members is a key issue. In the modern safety assessment system, we must compare the seismic demand with the seismic capacity. However, the performance model that can be used only reflects the experimental results of new structures that allow the deformation of steel bars, and the deformation and strength mechanisms do not necessarily reflect the response of old components. It is a well-known fact that RC members designed according to the old specifications are characterized by different structural details, imperfect constraints, and weak bonds between smooth reinforcement and concrete. Compared with the new structure, there are different post-yield mechanisms. The glossy reinforced concrete columns were designed according to the Italian guidelines of 1940-1970 and the results of the second phase of the test were reported. Under cyclic loading, the results of the component clearly show the effect of weak bonding during the development of rotational capability. Related research involves the monotonic response of the column and the chord rotation as determined by the empirical formula specified in Eurocode 8.