Diagnostic load tests and refined analyses are done to quantify structural performance. ✔Bridges without plans or design calculationsīDI can help! Using a combination of tools, we determine realistic load limits and condition states. ✔Non-standard designs (creative construction) time (s).Ĥ – AST350 strain gage placed in asphalt binder/mastic during the first stage of installation.ĥ – The hand-tamper used to generate stresses like those shown in Figure 2.With over a thousand bridge load tests under our belt, we have learned it’s the small off-system bridges that have complex issues: Various loads delivered from a hand tamper are shown as microstrain (µε) vs. Our STS4 node and laptop are on the right side.ģ – Tamping tests with high-speed data collection validating strain reading rebound. This shows BDI AST350 Transducer wired to Strain Indicator Readout Box.Ģ – Aaron Choi using a hand tamper to impact the sensor buried in our lab scenario. This information will soon be available on BDI’s website ( Photosġ – QA tamping performance test setup for testing a random sampling of sensors after production.
SOUNDAR BDI MANUALS
To better document recommended installation techniques we are producing detailed manuals and videos. Quality control documentation and calibration plots come packaged with each transducer. The 1000-ohm gage circuit reduces power demands and enhances the signal-to-noise ratio. The Wheatstone Full-bridge configuration circuit for these transducers is easily adaptable to most data acquisitions and standard strain readout units. The transducers come with heat-resistant lead wire cable to further enhance survival rates against the high temperatures encountered during asphalt placement.Įach transducer passes dynamic calibration which better represents the actual use of the transducer. Furthermore, this gage area has armored protection against vibratory rolling during compaction operations. To greatly reduce potential failure rates for these transducers, the gages use four active Wheatstone Bridge elements on a single custom-built gage matrix to eliminate the need for fragile wiring for bridge completion. As a result, they withstand high temperatures and vibratory rolling during asphalt placement. These sensors are low-modulus and ruggedized. Our AST350 asphalt strain transducer incorporated feedback received from Asphalt Pavement Testing Facility Operators and Pavement Researchers.įor further information contact our Sales Team - Stan Smith, Aaron Choi, or Tom Weinmann, our Subject Matter Expert #straingage #pavementsensors #pavingtheway #pavementmonitoring #bdi #AKP40Īsphalt strain transducers measure axial strain in flexible pavement providing high-frequency (dynamic) measurements. As a result, we are constantly assessing the performance of our sensors and improving their design to be successful.
#bridgeswithoutplans #integratedapproach #loadtestīDI instruments are successful because they’re field proven AND because we listen to the feedback from our valued customers and clients. These results allowed the client to make well-informed decisions regarding future actions with their bridge.
SOUNDAR BDI CODE
While the bridge has a variety of code issues, the bridge performed well from a load-carrying perspective. ✔Updated the client's AASHTOWare BrR model. ✔HS-20 Inventory Load Rating Factor of 2.6 / 74 tons. ✔Applicable limit state was allowable stress - slab was over-reinforced (compression controlled). ✔Shear and moment load distribution profiles obtained from calibrated model.
✔Bridge performed as a reinforced concrete slab as opposed to a stringer bridge. ✔Quasi-static load tests performed with ITD UBIT - position tracked with response data. Strain, displacement, and rotation sensors connected to STS4 data acquisition. Diagnostic load tests and load rating completed using BDI’s Integrated The small 2-span bridge shown here was constructed with railway steel rails, timber forms, and a concrete slab). Additionally, nondestructive evaluation (NDE) methods can be deployed to assess condition and address capacity questions.Īdditional challenges with non-standard designs are implementing applicable design codes and determining realistic limit states.
With over a thousand bridge load tests under our belt, we have learned it’s the small off-system bridges that have complex issues:
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