The outrigger truss system is one of the most frequently used lateral load resisting structural systems. However, little research has been reported on the effect of installation of outrigger trusses on improvement of lateral stiffness of a high-rise building through full-scale measurements. In this paper, stiffness changes of a high-rise building due to installation of outrigger trusses have been evaluated by measuring lateral displacements using a global positioning system (GPS). To confirm the error range of the GPS measurement system used in the full-scale measurement tests, the GPS displacement monitoring system is investigated through a free vibration test of the experimental model. Then, for the evaluation of lateral stiffness of a high-rise building under construction, the GPS displacement monitoring system is applied to measurements of lateral displacements of a 66-story high-rise building before and after installation of outrigger truss. The stiffness improvement of the building before and after the installation is confirmed through the changes of the natural frequencies and the ratios of the base shear forces to the roof displacements.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3871128 | PMC |
| http://dx.doi.org/10.3390/s131115489 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
An alternative recommendation for design eccentricity by consideration of uncoupled frequency ratio.
Sci Rep
December 2024
Department of Civil Engineering, Mehmet Akif Ersoy University, Burdur, Turkey.
Civil structures are prone to dynamic loadings such as strong winds or ground excitations where torsion becomes an ongoing issue. This arises from a lack of coincidence of the center of mass (CM) and rigidity (CR), known as eccentricity. Seismic design codes often introduce two types of eccentricity: inherent (geometric) and accidental.
View Article and Find Full Text PDFOperational Modal Analysis of Civil Engineering Structures with Closely Spaced Modes Based on Improved Hilbert-Huang Transform.
Sensors (Basel)
November 2024
School of Transportation Engineering, East China Jiaotong University, Nanchang 330013, China.
In long-span bridges and high-rise buildings, closely spaced modes are commonly observed, which greatly increases the challenge of identifying modal parameters. Hilbert-Huang transform (HHT), a widely used method for modal parameter identification, first applies empirical mode decomposition (EMD) to decompose the acquired response and then uses the Hilbert transform (HT) to identify the modal parameters. However, the problem is that the deficiency of mode separation of EMD in HHT limits its application for structures with closely spaced modes.
View Article and Find Full Text PDFA portrait of older adults in naturally occurring retirement communities in Ontario, Canada: A population-based study.
J Am Geriatr Soc
December 2024
Women's Age Lab, Women's College Hospital, Toronto, Ontario, Canada.
Article Synopsis
- Naturally occurring retirement communities (NORCs) are areas with a high concentration of older adults, which could help support strategies for aging in place, but there's limited data on their health needs.
- A study in Ontario linked a NORC registry with health records to compare older adults living in NORCs to those in other housing types, focusing on sociodemographic and healthcare use characteristics.
- Results showed that NORC residents were generally older, had more chronic health issues, used more medications, and required more healthcare services than their counterparts in other housing situations, indicating a need for targeted support in these communities.
Supramolecular self-assembly for synthesis of novel chitosan-based adhesive in wood composites so as to improve waterproofing and flame retardancy.
Int J Biol Macromol
January 2025
Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University, Kunming 650224, China. Electronic address:
As awareness of building safety and fire prevention grows, the demand for fire-retardant materials is gradually increasing. The need for flame-retardant wood composites is particularly urgent in public, high-rise, and commercial buildings. However, most of the current research has focused on adding flame retardants, often at the expense of mechanical properties.
View Article and Find Full Text PDFUntil the 1990s and the spread of air-conditioning, cooling down during the hot, humid and windless summers in the city of Chongqing (Southwest China) was mainly practised outdoors: sleeping on the rooftops of multistorey buildings, playing mah-jongg in the streets, fanning oneself with a hand fan or installing bamboo beds in the compounds' leafy courtyards. With the availability of affordable electricity and the popularisation of mechanical cooling, refreshing oneself has been relocated to the indoors. The transforming practices in and around the house have led not only to an increasing dependency on electricity for cooling but also to a socio-economic stratification.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!