This week's Friday Semiar is all about bridge networks. UC Berkeley Ph.D. candidate Xiaofei Hu presenter her research with the talk, "Reliability-Based Optimization for Maintenance Management."
Incorporating network configurations in bridge management problems is computationally difficult. Because of the interdependencies among bridges in a network, they have to be analyzed together. Simulation-based numerical optimization techniques adopted in past research are limited to networks of moderate sizes. In this research, a simple framework is developed to determine optimal maintenance plans for large networks with many bridges. The objective is to minimize disruption, specifically, the extra travel distance caused by potential bridge failures over a planning horizon and under a budget constraint. It is conjectured and then verified that the expected increase in vehicle-miles travelled due to failures can be approximated by the sum of expected increases due to individual failures. This allows the network-level problem to be decomposed into single-bridge problems and tackled efficiently. The computational effort increases linearly with the number of bridges.
The seminar takes place this Friday, April 18th, 2014 from 4-5 PM in 534 Davis. Cookie Hour will be in the library at 3:30.
in Bridge Networks
This week's TRANSOC Friday Seminar features ITS Berkeley PhD candidate Haotian Liu presenting Adaptive Optimization Methods in System-Level Bridge Management.
An adaptive optimization approach, known as Open-Loop Feedback Control (OLFC), is presented for Maintenance, Repair and Replacement planning of systems of bridge components. The proposed implementation of OLFC in Bridge Management Systems is intended to improve bridge management decision-making and deterioration model learning. The OLFC approach is capable of providing more accurate models than the state-of-the-art methods and yielding system cost-savings over any planning horizon when condition survey data are used to update the bridge component deterioration models. OLFC also enables agencies to consider different model classes when learning deterioration models. To illustrate the desirability of this approach, a planning agency is considered to manage a system of facilities with limited prior knowledge of the deterioration models over a designated planning horizon. OLFC is shown to improve model accuracy and reduce system costs, with a demonstration of how to incorporate system budget constraints when the system is heterogeneous. The discussion is confined to bridge decks, the component of bridge structures that undergoes the fastest deterioration, but the methodology presented in this paper is applicable to all bridge components.
The seminar will take place on Friday November 22, 2013 from 4:00-5:00 PM in 534 Davis. Cookie Hour will be taking place as usual in the library at 3:30 PM.
There are an estimated 600,000,000 passenger cars in the world, and that number is increasing every day. So too is Earth’s supply of parking spaces. In some cities, parking lots cover more than one-third of the metropolitan footprint. It’s official: we have paved paradise and put up a parking lot. In ReThinking a Lot, Eran Ben-Joseph shares a different vision for parking’s future. Parking lots, he writes, are ripe for transformation. After all, as he points out, their design and function has not been rethought since the 1950s. With this book, Ben-Joseph pushes the parking lot into the twenty-first century.
In this talk, we describe development and field application of a process control framework to support structural health-monitoring and management of transportation infrastructure. The work is motivated by technological advances that allow for continuous, long-term, simultaneous collection of various response measurements, as well as the factors that contribute deterioration. The framework provides an integrated, generally-applicable (to various types of structural response data) statistical approach that links performance modeling and structural health monitoring. The framework consists of two parts: The first, estimation of statistical models to explain, predict, and control for common-cause variation, i.e., changes, including serial dependence that can be attributed to usual operating conditions. The ensuing standardized innovation series are analyzed in the second part of the framework, where we use single and multivariate control charts to detect special-cause or unusual events. We illustrate the proposed framework with analysis of strain and displacement data from the monitoring system on the Hurley Bridge (Wisconsin Structure B-26-7).
The seminar takes place Friday, November 8, 2013 in 534 Davis from 4:00-5:00 PM. Cookie Hour (of course) precedes in the library at 3:30.
Today's TRANSOC Friday Seminar features UCTC Assistant Director Karen Trapenberg Frick will presenting about the evolution of the Eastern Span San Francisco-Oakland of the Bay Bridge from an ordinary bridge into a megaproject.
The new eastern span of the San Francisco-Oakland Bay Bridge, which was opened after the Labor Day weekend, is a classic instance of a megaproject, not just because of its huge complexity, protracted timeline and “mega” cost (some $6.5 billion). It is also a textbook embodiment of what I have identified as the “six C’s” of a typical megaproject: colossal, captivating, costly, controversial, complex, and subject to issues of control.
The seminar will take place a 4:00-5:00 PM September 13, 2013 in 534 Davis Hall. And of course Cookie Hour in the library at 3:30. See you there!
Starting this evening, the Bay Bridge will close and reopen Tuesday September 3 at 5:00 am. Over the weekend the final touches will be put on the new Eastern Span and on Tuesday morning, you can have a new driving experience across that span. You will no longer have to contend with the S-Curve. There will be bicycle and pedestrian access! (Though only to Treasure Island... and even that isn't quite ready yet.) The old span will still be around for some time though, as it's going to take 3 years to dismantle.
This research focuses on investment in roads and highways in part because it is the largest component of public infrastructure in the United States. Moreover, the procedures by which federal highway grants are distributed to states help us identify more precisely how transportation spending affects economic activity.
We find that unanticipated increases in highway spending have positive but temporary effects on GSP, both in the short and medium run. The short-run effect is consistent with a traditional Keynesian channel in which output increases because of a rise in aggregate demand, combined with slow-to-adjust prices. In contrast, the positive response of GSP over the medium run is in line with a supply-side effect due to an increase in the economy’s productive capacity.