伊斯坦布尔253米高斜面建筑基于振动的临时监测

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Spectra Pub Date : 2023-09-26 DOI:10.1177/87552930231200031
Ozan Cem Celik, Erhan Budak, Halûk Sucuoğlu
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引用次数: 0

摘要

伊斯坦布尔一座253米高的平行四边形办公大楼,总共有62层,上面有54层塔楼,下面有8层裙楼,使用部署在20个不同楼层的92个加速度计通道进行了大约4天的监测。该建筑的结构体系由钢筋混凝土(RC)核心剪力墙和外围组合柱以及29层和31层之间的两层高的RC伸出体组成。从环境振动记录中确定了建筑物的前12个自振周期、振型和平移模态方向。这些动态特性是用三维有限元模型再现的,该模型使用所有结构成员的总截面特性而无需更新模型。在测试时,建筑物的基本寿命为5.3秒,预计在规定的服务水平和设计水平评估中,结构构件开裂后,建筑物的基本寿命将分别延长至5.9秒和7.8秒,以符合最近的高层建筑基于性能的设计指南。采用随机减量法进行统计分析,确定了前6种振型的阻尼比,中位数为0.6%,变异系数为0.3 ~ 0.4。当建筑物受到建筑物附近记录的2019年M w 5.8马尔马拉海地震地面运动时,模拟的峰值楼层加速度表明,较低楼层超过了ASCE 7-16结构内楼层加速度放大,但上层没有达到。
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Vibration-based temporary monitoring of a 253 m tall skew-plan building in Istanbul
A 253 m tall office building in Istanbul with a parallelogram footprint, which has 62 stories in total, 54 tower stories above and 8 podium stories below grade, was monitored using 92 channels of accelerometers deployed on 20 different floors for about 4 days. The structural system of the building consists of reinforced concrete (RC) core shear walls with peripheral composite columns and two-story tall RC outriggers between floors 29 and 31. First 12 natural vibration periods and mode shapes of the building together with the modal directions for the translational modes were identified from the ambient vibration records. These dynamic properties were reproduced with the three-dimensional finite element model developed using gross section properties for all structural members without a need for model updating. The fundamental period of the building at the time of testing, 5.3 s, is expected to lengthen to 5.9 s and 7.8 s upon cracking in structural members for the prescribed service-level and design-level evaluations, respectively, in line with the recent performance-based design guidelines for tall buildings. Damping ratios for the first six vibration modes, with median values of 0.6% and coefficients of variation in the order of 0.3–0.4, were identified through statistical analysis using the random decrement technique. The simulated peak floor accelerations, when the building was subjected to the 2019 M w 5.8 Marmara Sea earthquake ground motions recorded in the vicinity of the building, showed that ASCE 7-16 in-structure floor acceleration amplifications are exceeded at the lower floors but not reached at the upper floors.
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来源期刊
Earthquake Spectra
Earthquake Spectra 工程技术-工程:地质
CiteScore
8.40
自引率
12.00%
发文量
88
审稿时长
6-12 weeks
期刊介绍: Earthquake Spectra, the professional peer-reviewed journal of the Earthquake Engineering Research Institute (EERI), serves as the publication of record for the development of earthquake engineering practice, earthquake codes and regulations, earthquake public policy, and earthquake investigation reports. The journal is published quarterly in both printed and online editions in February, May, August, and November, with additional special edition issues. EERI established Earthquake Spectra with the purpose of improving the practice of earthquake hazards mitigation, preparedness, and recovery — serving the informational needs of the diverse professionals engaged in earthquake risk reduction: civil, geotechnical, mechanical, and structural engineers; geologists, seismologists, and other earth scientists; architects and city planners; public officials; social scientists; and researchers.
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