Amplitude-dependent model updating of masonry buildings undergoing demolition

IF 2.1 3区 工程技术 Q2 ENGINEERING, CIVIL
Panagiotis Martakis, Y. Reuland, E. Chatzi
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引用次数: 6

Abstract

Precise knowledge of dynamic characteristics and data-driven inference of material properties of existing buildings are key for assessing their seismic capacity. While dynamic measurements on existing buildings are typically extracted under ambient conditions, masonry, in particular, exhibits nonlinear behavior at already very low shaking amplitudes. This implies that material properties, inferred via data-driven model updating under ambient conditions, may be inappropriate for predicting behavior under seismic actions. In addition, the relative amount of nonlinearity arising from structural behavior and soilstructure interaction are often unknown. In this work, Bayesian model updating is carried out on field measurements that are representative of increasing levels of shaking, as induced during demolition, on a pre-code masonry building. The results demonstrate that masonry buildings exhibit nonlinear behavior as the elastic modulus drops by up to 18% in the so-called equivalent elastic range, in which the observed frequency drop is reversible, prior to any visible sign of damage. The impact of this effect on the seismic assessment of existing structures is investigated via a nonlinear seismic analysis of the examined case study, calibrated under dynamic recordings of varying response amplitude. While limited to a single building, such changes in the inferred material properties results in a significant reduction of the safety factor, in this case by 14%.
拆除砌体建筑振幅相关模型更新
现有建筑的动力特性的精确知识和材料性能的数据驱动推理是评估其抗震能力的关键。虽然现有建筑物的动态测量通常是在环境条件下提取的,但砖石结构在已经非常低的振动幅度下表现出非线性行为。这意味着,在环境条件下通过数据驱动的模型更新推断出的材料属性可能不适合预测地震作用下的行为。此外,由结构行为和土-结构相互作用引起的非线性的相对量往往是未知的。在这项工作中,贝叶斯模型更新是在现场测量中进行的,这些测量代表了在拆除过程中引起的震动水平的增加,在预规范砖石建筑上。结果表明,砌体建筑表现出非线性行为,弹性模量在所谓的等效弹性范围内下降高达18%,在此范围内观察到的频率下降是可逆的,在任何可见的损伤迹象之前。通过对所检查的案例进行非线性地震分析,在不同响应幅度的动态记录下进行校准,研究了这种影响对现有结构地震评估的影响。虽然仅限于单个建筑,但推断材料特性的这种变化导致安全系数显著降低,在这种情况下降低了14%。
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来源期刊
Smart Structures and Systems
Smart Structures and Systems 工程技术-工程:机械
CiteScore
6.50
自引率
8.60%
发文量
0
审稿时长
9 months
期刊介绍: An International Journal of Mechatronics, Sensors, Monitoring, Control, Diagnosis, and Management airns at providing a major publication channel for researchers in the general area of smart structures and systems. Typical subjects considered by the journal include: Sensors/Actuators(Materials/devices/ informatics/networking) Structural Health Monitoring and Control Diagnosis/Prognosis Life Cycle Engineering(planning/design/ maintenance/renewal) and related areas.
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