Fernstrom E.V.,University of Arkansas |
Carreiro J.L.,University of Arkansas |
Grimmelsman K.A.,Pennoni Associates Inc.
Sound and Vibration | Year: 2014
Quantitative data describing condition and performance is essential for evaluating the structural health of bridges. Dynamic testing is a common approach for globally characterizing bridges in a quantitative sense. Dynamic testing is most commonly accomplished for full-scale bridge structures through either forced vibration testing or ambient vibration testing methods. Forced vibration testing offers many advantages but is generally not a practical or economical approach for many bridges due to the high cost of providing controlled excitation, limits to the excitation that can be supplied, and interference with the normal operation of the bridge. We have been investigating the feasibility of using low-cost, small-scale dynamic exciters for forced vibration testing of short- to medium-span bridges. The exciters being evaluated have a unit cost that is comparable to a typical accelerometer and could be deployed in numbers using a spatially distributed setup for forced vibration testing. This article presents and describes the results of a laboratory evaluation program conducted for these devices. Their capabilities and operating characteristics are compared with a laboratory-quality linear mass shaker. The preliminary results of a vibration test using these devices on an in-service highway bridge are also discussed. Source
Finch S.,Pennsylvania Environmental Council |
Morfei M.,Pennoni Associates Inc.
Green Streets and Highways 2010: An Interactive Conference on the State of the Art and How to Achieve Sustainable Outcomes - Proceedings of the Green Streets and Highways 2010 Conference | Year: 2010
Transportation investments in America throughout history have come at many different scales and from varying funding sources. Over time, investments have varied from public to private sources and back: From the private investments in construction of tolled "turnpikes" to connect the original 13 colonies; to a shift to public investment in the mid-19th century, best exemplified by Abraham Lincoln's support for "internal Improvements" early in his political career and for railroad construction subsidies later; from private investments in streetcars and streetcar suburbs in the turn of the 20th century; to the Eisenhower-era public investment in the national interstate highway system. Today, America is again trying to decide how best to fund repairs to its aging transportation infrastructure and what kinds of innovations will be needed in the 21 st Century. The American Society of Civil Engineers reports every year on the state of American infrastructure. The assessment is poor. In 2009, America's best ranking stood at a "C plus" for Solid Waste facilities, while Drinking Water, Inland Waterways, Levees, Roads, and Wastewater infrastructure all stood at the opposite end, each with a "D minus". © 2010 ASCE. Source
Greene C.,Pennoni Associates Inc. |
Kannan V.,SRF and Associates
ITE Journal (Institute of Transportation Engineers) | Year: 2011
A study that was conducted by SRF & Associates by using 14 different coffee/donut shops for the purposes of documenting trip generation volumes during the a.m. peak period is presented. A majority of the data was collected during the first half of December 2007 on typical weekdays; Mondays and Fridays were excluded from the data collection. Twelve out of the 13 shops studied were standalone buildings with one or two points of access, which made it easier to document trip generation volumes. The number of lanes adjacent to the store was determined by on-site observations. The population and median age within a three-quarter-mile radius of the store was determined by 2000 census data. Average daily traffic (ADT) volumes on the adjacent roadway were obtained from most recent data available on the study section of roadway adjacent to the study store. Considering that all of the factors that affect vehicle queuing vary from day to day, averages were developed based on our observations and combined into a simplified planning level formula. Source
Pezzotti J.J.,Pennoni Associates Inc.
Structures Congress 2010 | Year: 2010
In today's economic climate - of making every infrastructure dollar count - it is critically important to properly inspect and maintain our older long span bridges. Routine bridge inspections and maintenance not only provide the user with a safer structure, but also provides the owner with a bridge that will stand the test of time. Bridge inspection/maintenance procedures, however, can be costly to the owner and a major inconvenience to the user when access to the underside of the structure can only be achieved from inspection vehicles parked on the bridge deck. Travel lane closures to complete the required work can cause significant safety and traffic problems, especially on narrow bridges. To address these concerns, the Burlington County Bridge Commission made the decision to install a motorized rolling traveler platform beneath its Burlington-Bristol Bridge. The Burlington-Bristol Bridge is a long span moveable toll structure that crosses the Delaware River, connecting southeastern Pennsylvania with New Jersey. The bridge carries two 10' travel lanes and a 4' sidewalk, thus requiring a night time bridge closure when inspection or construction access vehicles, such as snoopers, are required. The traveler system was installed on the Burlington-Bristol Bridge during the summer of 2009. When suspended from the underside of the bridge, the traveler platform will be guided by motorized carriages that will travel along steel track beams. The total travel range of the platform is 940' and includes access to the 540' moveable vertical lift main span and the two adjacent 200' tower spans. When needed, the traveler platform will be lifted in place from a small boat along the river, eliminating traffic disruptions on the bridge, and used for bridge inspection, maintenance and repairs. It will only occupy the underside of the bridge when being used; once work is complete it will be removed. The traveler platform will greatly benefit the owner as well as the user by providing a more economical, safer and non-disruptive underside inspection and repair alternative when compared to past procedures that required travel lane closures. © 2010 American Society of Civil Engineers. Source
Chen Y.,Binghamton University State University of New York |
Twigg C.M.,Binghamton University State University of New York |
Sadik O.A.,Binghamton University State University of New York |
Tong S.,Pennoni Associates Inc.
2011 IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM Workshops 2011 | Year: 2011
Efficient monitoring and control of wastewater treatment plants (WWTPs) has become an important public issue as the cost of electricity continues to grow and the quality requirements of processed water tightens. However, the development, deployment, and maintenance of highly efficient monitors and controllers for wastewater processing tanks are significantly challenging. Self-powered, wireless sensor networks (WSNs) are an ideal candidate for this application, since their deployment would have the least impact on the existing infrastructure. A novel wireless sensor network is presented in this paper that integrates microbial fuel cells (MFCs), field-programmable analog arrays (FPAAs), and low-power networking protocols into the sensors to make them self-powered, highly flexible, and adaptive. MFCs convert chemicals in the waste water into electrical energy, while FPAAs provide a means of performing ultra-low-power, real-time, and adaptive processing of the sensor signals. This design achieves sustainable monitoring and control of wastewater treatment with minimal impact to existing infrastructure. © 2011 IEEE. Source