Seismic instrumentation of high-rise buildings

Wang, Guoxin; Wang, Weizheng; Aafshar, Katayoun B.; Dojcinovski, Dragi

doi:10.1016/j.pnsc.2008.06.011

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…The previously mentioned treatment on initial modal matrices is based on the theory of optimal placement of sensors . For each initial modal matrix, the floors eliminated during the treatment are those having relatively higher dependencies with others.…”

Section: Weight Coefficients Based On Modal Informationmentioning

confidence: 99%

Correlation between global damage and local damage of RC frame structures under strong earthquakes

2016

Struct. Control Health Monit.

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In order to reasonably incorporate local and global monitoring response data into dynamic update in the weighted combination models for a closer correlation between global damage and local damage, a logical time-variant correlation between global damage and local damage is established for reinforced concrete structures under strong earthquakes. Two sets of dynamic weight coefficients used to characterize the relative damage contribution of floors through modal information and energy information are suggested in the correlation. The modal information-based weight coefficients that are defined as the normalized accumulative times of reserved floors could be capable of retaining the necessary information of relatively weak floors or sensitive regions with localized damage significance, while the energy information-based weight coefficients based on the normalized curvature difference of 'jerk energy' are helpful to quantify the relative degree of floor damages accumulated by hysteretic dissipated energy. The combination factors corresponding to the proposed dynamic weight coefficients, together with static weight coefficients, are calibrated by a macroscopic global seismic damage model. The results from the example study indicate that these factors show different changing rules with increasing peak ground acceleration level. Modal information-based weight coefficients have been found to have a desirable agreement with the inter-story pure translation ratios.

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Section: Weight Coefficients Based On Modal Informationmentioning

confidence: 99%

Correlation between global damage and local damage of RC frame structures under strong earthquakes

2016

Struct. Control Health Monit.

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Benefit of structural access panels (SAP) for post-earthquake structural health monitoring

Luo,

MacRae,

Xue

et al. 2023

Bull Earthquake Eng

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This paper develops a method to quantify the benefit of using structural access panels (SAPs) placed in internal partition walls (IPWs) or ceilings near the dissipative elements of structures for post-earthquake structural health monitoring (SHM) without damaging the building non-skeletal elements (NSEs). The benefit of SAPS is considered for different levels of shaking considering the possibility of (i) no likely structural damage, (ii) likely building irreparability, or (iii) building NSE damage. The methodology is developed for shaking intensity scenarios with annual shaking probabilities of exceedance ranging from 1/25 to 1/10,000. Structural demands for different scenarios are initially obtained using time history analysis. The number of scenarios was increased by additionally generated demands assuming lognormal distributions of response. Monte-Carlo analysis was used to assess the likelihood of reaching particular decision states, considering uncertainty associated with achieving these states. Probabilistic (time-based) benefits of using SAPs are also considered. Additionally, buildings with both conventional IPWs and low-damage IPWs are considered. Finally, the methodology is applied to a realistic 6 storey eccentrically braced frame (EBF) structure. In the study, the scenario-based analysis indicated that the SAPs were not effective during very small earthquake events where the post-earthquake inspection will not be triggered, or during very large events where the building is externally observed to be irreparable. Furthermore, if the NSEs equipped with SAPs sustain significant damage, SAPs were not needed for inspection. As a result, the SAPs were more beneficial when installed in low-damage NSEs, as compared to conventional NSEs, especially during moderate to high shaking levels. For the casestudy building considered, the probabilistic loss study indicates the break-even time for SAPs to be economical, considering initial installation costs, and inspection savings related to direct damage and downtime losses, was less than 2 years. The benefit-to-cost ratio of SAPs for rapid and reliable post-earthquake inspection was up to 26 over the expected building life of 50 years.

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Numerical Investigation on the Effects of Local Damage to the Dynamic Properties of Buildings Using Limited Vibration Data

Caringal¹,

Oreta²

2016

IABSE Conference, Guangzhou 2016: Bridges and Structures Sustainability - Seeking Intelligent Solutions

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<p>The challenge in structural health monitoring and damage detection is how to use the limited number of sensors on a building to assess the condition of the structure at any point in time. A case study simulating application of different levels of isolated local damage to the different floors were done to determine the corresponding dynamic properties and to observe the sensitivity of the dynamic properties to local changes using a several shear building models. Dynamic condensation was also applied to the model to portray limited vibration data.The results from the condensed 2 DOF model resulting into the two lowest natural frequencies in the structure can only be used in detecting the damage from the first unto the fifth floor in the building. With that, a change of 5% in the frequency can mean up to a 50% local damage to the stiffness in a single floor. These findings can be used to estimate the damage present in a building and provide warning signals for the building owner.</p>

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Seismic instrumentation of high-rise buildings

Cited by 3 publications

References 3 publications

Correlation between global damage and local damage of RC frame structures under strong earthquakes

Correlation between global damage and local damage of RC frame structures under strong earthquakes

Benefit of structural access panels (SAP) for post-earthquake structural health monitoring

Numerical Investigation on the Effects of Local Damage to the Dynamic Properties of Buildings Using Limited Vibration Data

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