Project Experience in Assessment and Reuse of Old Foundations

Hertlein, Bernard; Walton, William H.

doi:10.1061/40902(221)19

Cited by 8 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these cases, lightweight timber buildings and extensions can enable development where heavier conventional building constructions would not. Notwithstanding the challenges of assessing the capacity of existing structures, the potential sustainability and economic benefits of building reuse (Laefer and Manke, 2008) and foundation reuse (Hertlein and Walton, 2007) are well recognised.…”

Section: Urban Densificationmentioning

confidence: 99%

Lightweighting with Timber: An Opportunity for More Sustainable Urban Densification

Foster

Reynolds

2018

J. Archit. Eng.

View full text Add to dashboard Cite

Section: Urban Densificationmentioning

confidence: 99%

Lightweighting with Timber: An Opportunity for More Sustainable Urban Densification

Foster

Reynolds

2018

J. Archit. Eng.

View full text Add to dashboard Cite

“…As a result, these recent FHWA policies have prompted a resurgence of studies regarding NDT methods to address deficiencies in predictions of foundation characteristics (e.g. Jo et al 2003;Jalinoos et al 2006;Hertlein and Walton 2007;Yu et al 2007; Robinson and Webster 2008;Descour and Kabir 2010;Briaud et al 2012).…”

Section: Introductionmentioning

confidence: 97%

Comparison of Borehole Ultrasound and borehole radar in evaluating the length of two unknown bridge foundations

Coe

Kermani

2016

DFI Journal - The Journal of the Deep Foundations Institute

View full text Add to dashboard Cite

Foundation length is an important parameter when assessing bridge vulnerability to failures related to scour hazards. As a result, multiple non-destructive testing methods have been developed to evaluate the geometry of unknown foundations, each with their own advantages and disadvantages. Subsurface methods that rely on measurements from boreholes alongside the foundation are often the most robust when evaluating foundation length, particularly for complex foundations (e.g. footings supported on piles). In this study, such a system was developed to evaluate the length of foundations at two bridge sites in Philadelphia using ultrasound acoustic waves (i.e. P-waves). Characteristics of the foundations and the site conditions are summarised as well as the ultrasound system components. The system was lowered in a borehole alongside each foundation as 100 kHz P-waves were generated to develop a reflection image of the pile-soil interface. Foundation length was evaluated based on discontinuity of the reflected signals with depth. This ultrasound system was developed to address inadequacies with borehole radar testing in similar applications related to unknown foundations. In particular, borehole radar has limited capabilities in clayey soil profiles, where high values of electrical conductivity limit radar signal strength. A commercial borehole radar system (MALÅ 250 MHz ProEx) was therefore utilised at both bridge sites to provide a comparison of results using both systems.

show abstract

“…Since Olson and Aouad (2001), the policies implemented by the FHWA have prompted a resurgence of studies regarding NDT methods to address deficiencies in predictions of foundation characteristics (e.g. Jo et al 2003, Jalinoos et al 2006, Hertlein and Walton 2007, Yu et al 2007, Robinson and Webster 2008, Descour and Kabir 2010, Briaud et al 2012). However, very few have focused on the potential use of P-wave reflection imaging for foundation characterization, despite the key advantages it holds over other more common NDT methods.…”

Section: Introductionmentioning

confidence: 98%

Use of P-Wave Reflection Imaging and Other Nondestructive Testing Techniques to Evaluate Unknown Bridge Foundations

Coe

Kermani

Nyquist

et al. 2014

Geo-Congress 2014 Technical Papers

View full text Add to dashboard Cite

Unknown bridge foundations present a unique challenge to Departments of Transportation (DOT) across the country since foundation characteristics are a necessary input to assess scour vulnerability and to develop appropriate scour countermeasures. A number of non-destructive testing (NDT) techniques have evolved over time to address this challenge and evaluate unknown foundation type and geometry. An ultrasonic P-wave reflection imaging system developed to characterize the depth profile of vertically embedded structural elements in soil is presented as a viable NDT method to assess unknown foundations. System components and data acquisition are briefly reviewed, followed by a discussion of issues related to acquisition of P-waves in soils. The P-wave system was utilized in a field testing program to image the vertical profile of foundations at bridge sites in southeastern Pennsylvania. Characteristics of the foundations tested in the field and the site soil conditions are summarized. The final foundation depths were unknown to the research team at the sites, which resulted in a true blind study and simulated the unknown foundation problem. The ultrasound probe was lowered in a cased borehole alongside the foundation to generate and record p-wave signals. The resulting data was plotted to construct an image and predict foundation characteristics. Multiple NDT techniques including Parallel Seismic, Borehole Magnetic, and Borehole Radar were also performed at the sites in conjunction with the P-wave testing. The resulting data and interpretation of foundation characteristics are compared between all methods.

show abstract

Project Experience in Assessment and Reuse of Old Foundations

Cited by 8 publications

References 0 publications

Lightweighting with Timber: An Opportunity for More Sustainable Urban Densification

Lightweighting with Timber: An Opportunity for More Sustainable Urban Densification

Comparison of Borehole Ultrasound and borehole radar in evaluating the length of two unknown bridge foundations

Use of P-Wave Reflection Imaging and Other Nondestructive Testing Techniques to Evaluate Unknown Bridge Foundations

Contact Info

Product

Resources

About