Abstract
This study provides the result of dynamic effects of self-propelled modular transporter (SPMT) movements during a simulated bridge transport. Accelerometers were attached to an SPMT and different transport scenarios were simulated under several loading conditions. For the vertical direction, a traverse of uneven terrain provided the peak platform acceleration (PPA), whereas a rapid start-and-stop motion controlled both longitudinal and transverse directions. The observed PPA increased as the total weight decreased. Vertical accelerations were found to be highly dependent on the SPMT speed. The horizontal accelerations were not affected by the speed of the SPMT, but they were affected by the ability of the operator to perform a braking operation. Response spectra suitable for the design for each direction were constructed from the time history graphs corresponding to these tests. The maximum pseudo accelerations (MPAs) for heavy, medium, and light load cases were 0.68, 1.07, and 2.3g in the vertical direction; they were significantly more than the horizontal direction with 0.32g for heavy, 0.47g for medium, and 0.60g for the light load case. The dynamic forces on the cargo (falsework or bridge) either increased or stayed constant as the stiffness of the system increased. Although vertical accelerations, which mostly affect the bridge superstructure components, can be reduced by limiting the SPMT speed, the horizontal accelerations can be reduced because some ductility and inelasticity within the bracing of the falsework and response modification factors may be applied to the developed spectra. Dynamic dead load impact (DLI) factors were found to be in excess of those often used for the design because of the worst-case nature of the presented results.
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Acknowledgments
The authors would like to thank Steven Sarens of Sarens Construction in Dickinson, Texas, for providing access to construction equipment with additional thanks to Navid Zolghadri for his help on the data acquisition system. This work was sponsored by AASHTO, in cooperation with the Federal Highway Administration (FHWA), and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine. This publication was supported in part by a subcontract from Rutgers University, Center for Advanced Infrastructure and Transportation (CAIT), under DTFH62-08-C-00005 from USDOT-FHWA. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of Rutgers University or those of USDOT-FHWA U.S.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 24 • Issue 3 • March 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Mar 5, 2018
Accepted: Sep 6, 2018
Published online: Jan 2, 2019
Published in print: Mar 1, 2019
Discussion open until: Jun 2, 2019
ASCE Technical Topics:
- Bridge components
- Bridge engineering
- Bridges
- Construction engineering
- Construction industry
- Construction management
- Continuum mechanics
- Design (by type)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Horizontal loads
- Infrastructure construction
- Load factors
- Modular structures
- Solid mechanics
- Structural design
- Structural dynamics
- Structural engineering
- Structures (by type)
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