This study deals with the seismic fragility assessment of high-rise reinforced concrete (RC) structures in Romania designed after the major Vrancea intermediate-depth earthquake of March 4, 1977. Firstly, the evolution of Romanian seismic design codes employed before (P13-63 and P13-70) and after (P100-78/81) the Vrancea 1977 seismic event is presented. The influence of the above-mentioned seismic event on the seismic zonation of Romania is also discussed in the context of seismic design codes. Secondly, the damage information of pre-1977 high-rise RC structures during the March 4, 1977 Vrancea earthquake is presented and discussed. The seismic fragility assessment is performed by employing incremental dynamic analyses for both high-rise RC frames structures, as well as for high-rise RC shear walls structures which were widely used for residential purposes. For incremental dynamic analyses, ground motion datasets characteristic for the seismic conditions of Romania are selected and further employed. The results of the analyses show an increase of 30–40% of the median peak ground acceleration corresponding to various damage states for post-1977 RC frames and RC shear walls structures, as compared to the pre-1977 ones.

这项研究处理的是在1977年3月4日发生大范朗塞（Vrancea）中深度地震后设计的罗马尼亚高层钢筋混凝土（RC）结构的地震易损性评估。首先，罗马尼亚地震设计规范的演变（P13-63 （P13-70）和（P100-78 / 81）之后，呈现了Vrancea 1977年地震事件。在抗震设计规范的范围内，还讨论了上述地震事件对罗马尼亚地震分区的影响。其次，介绍并讨论了1977年以前的高层RC结构在1977年3月4日发生的Vrancea地震中的破坏信息。地震易损性评估是通过对两个高层RC框架结构采用增量动力分析来进行的，以及广泛用于住宅用途的高层RC剪力墙结构。为了进行增量动力分析，选择并进一步采用了罗马尼亚地震条件下的地震动数据集。分析结果表明，与1977年前的钢筋混凝土框架和RC剪力墙结构相比，1977年后的RC框架和RC剪力墙结构的各种损伤状态对应的峰值地面加速度中值峰值增加了30–40％。