Jones M.H.,HNTB |
Treyger S.,HNTB |
Pence P.W.,HNTB |
Shama A.,Hardesty and Hannover
Structures Congress 2013: Bridging Your Passion with Your Profession - Proceedings of the 2013 Structures Congress | Year: 2013
Design/Build delivery is underway for the replacement Gerald Desmond Cable-Stayed Bridge for the Port of Long Beach and the California Department of Transportation. This will be the first cable-stayed bridge built in California for highway or transit traffic. The replacement bridge is located adjacent to active seismic faults that can produce near-field ground motion effects that the bridge must accommodate. This will be the first large cable-stayed bridge built in the United States in a highly active seismic zone. Therefore, it will advance the state-of-practice for seismic design of cable-stayed bridges. In consideration of the large seismic threat and to provide a structure with superior seismic resistance, performance-based seismic design criteria were developed. For each evaluation earthquake, criteria specified the level of acceptable damage and maximum allowable material strains and residual drifts. Compliance with the performance-based design criteria is verified through detailed non-linear time-history analysis, which includes extensive soil-structure interaction modeling. © 2013 American Society of Civil Engineers.
Mankbadi R.,Hardesty and Hannover |
Ramakrishna A.,Hardesty and Hannover |
Yang K.-Y.,Geotechnical Unit
Transportation Research Record | Year: 2010
A case history involving the design and construction of the water pier foundations for a fixed high-level precast segmental bridge over the Shrewsbury River in Monmouth County, New Jersey, is presented. The water pier foundations are supported on 54-in. prestressed open-ended concrete cylindrical piles with a 6.0-in. wall thickness. Design concepts for cylindrical piles are outlined. Results of the pile load testing program on one pile are presented. The reliability of the pile driving analyzer and case pile wave analysis program data are evaluated based on the result of the static load test. Installation procedures and load-testing programs of the open-ended cylindrical piles are discussed. A comparison of case histories of large-diameter cylindrical piles is presented, drawing from a similar experience of a former project. Recommendations for design, construction, and dynamic testing of large-diameter cylindrical piles are made.
Hamderi M.,00 Penn Center Blvd Bldg 5 |
Gallagher P.M.,Drexel University |
Lin Y.,Hardesty and Hannover
Vadose Zone Journal | Year: 2014
Colloidal silica has recently been investigated for use as a grouting material to mitigate liquefaction risk at developed sites. The study discusses the results of several column tests on the injection performance of Colloidal Silica against liquefaction and their simulations with a flood simulator program UTCHEM. The UTCHEM flood simulator was used to develop a numerical model to simulate colloidal silica transport through sand columns. Most existing numerical models for colloidal silica modeling include the gelation process, in which the viscosity gradually becomes orders of magnitude greater than the initial grout viscosity. However, in field grouting applications of shallow, loose, cohesionless deposits, injection at high viscosities may be limited due to allowable pressure limitations. In these cases, the injection is planned to be completed just before the gelling reaction begins. Thus, modeling the gelation process may not be necessary. The UTCHEM simulator accounts for fluids with varying densities and viscosities, making it a useful tool for simulating colloidal silica injection in cases where gelation does not need to be modeled explicitly. The model was validated using laboratory data from five column tests in which loose sand was treated with colloidal silica grout and one column test in which sand was treated with sodium silicate. The numerical model accurately represented the physical experiments. The numerical model provides a validated tool that can be used to design and optimize stabilizer delivery for laboratory and field applications in which gelation does not need to be modeled explicitly. © Soil Science Society of America.
Rolwood C.,Hardesty and Hannover |
Drew R.,Hardesty and Hannover
Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management | Year: 2010
During 2005 and 2006, Hardesty & Hanover performed bridge condition inspection of three prominent railroad bridges. The first bridge is Amtrak's Little Hell Gate Bridge in New York City. Completed in 1917, it is a three-track, 1,156-foot long, unique underdeck inverted bow string steel truss structure with pins and eyebars, soaring high above the urban landscape of New York, designed by the renowned Gustav Lindenthal and Othmar Ammann. The second and third bridges are the Tunkhannock and Martin's Creek Viaducts near Scranton, Pennsylvania, inspected for Canadian Pacific Railway. The viaducts were constructed circa 1915 and are massive, world-record, reinforced concrete structures of 2,375 feet and 1,600 feet length respectively, that carry a single-track railroad as high as 240 feet above forested mountain valleys of northeastern Pennsylvania. This presentation provides information on the challenges regarding field inspection access, specialty testing, and recommended maintenance programs on these types of bridges. © 2010 Taylor & Francis Group, London.
Herrmann A.,Hardesty and Hannover
ICSI 2014: Creating Infrastructure for a Sustainable World - Proceedings of the 2014 International Conference on Sustainable Infrastructure | Year: 2014
Engineers play a unique role in the built world - planning, analyzing, designing, building, and rebuilding things that touch the planet - and therefore have an optimal and natural role in changing the built environment to meet new needs. The 2013 Report Card for America's Infrastructure found that our nation's roads, bridges, and other infrastructure systems are in serious need of repair and modernization. The 16 infrastructure sectors evaluated in the comprehensive report earned a cumulative grade of D+, with the lowest grades of D - going to levees and inland waterways. As the nation faces a daunting backlog of rehabilitation and replacement projects, how do we ensure that we build in a more sustainable way to maximize limited resources? Sustainability strategies were examined in three key infrastructure sectors: transportation, water, and energy. Solutions range from bringing existing infrastructure to a state of good repair, using technology and nonstructural methods to get more capacity out of road lanes, and managing demand through conservation strategies. © 2014 American Society of Civil Engineers.
Ramakrishna A.M.,Hardesty and Hannover
Geotechnical Special Publication | Year: 2011
Due to the unique characteristics of Karst terrain, accurately defining subsurface conditions presents significant challenges. Failure to identify Karst terrain features, such as rock pinnacles and large soil-filled cavities in rock, can significantly increase project cost both during and after construction. Resistivity profiling, also known as Electrical Resistivity Imaging (ERI), is an effective geophysical investigation technology used to identify sinkhole features. Resistivity profiling provides valuable data for engineers to assess sinkhole potential. Its data helps with selection of appropriate foundation types, construction procedures and storm water management practices. The ultimate result of ERI data acquisition is reduction in sinkhole collapse potential and associated impacts to the construction cost and schedule. This paper provides a general description of the ERI technique. In addition, it presents ERI profile data obtained at a karst terrain site in Pennsylvania, in close proximity to geotechnical test boring locations. A comparison study between ERI profile data and standard penetration test borings are also presented. Finally, conclusions are presented regarding the effectiveness of the ERI in site characterization and ERI's limitations. © 2011 ASCE.
Tuckman D.,Hardesty and Hannover |
Deitch M.,Hardesty and Hannover
Modern Techniques in Bridge Engineering | Year: 2011
This paper and presentation will provide a detailed view of the benefits the Northeast Extreme Tee (NEXT) Beam delivers in the design, fabrication and construction process. Utilizing the Queens Boulevard Bridge over the Van Wyck Expressway as a case study, the paper will highlight the benefits of flexibility in design, speed and ease of both manufacturing and construction. The bridge was designed in 2009 and is currently in the preliminary phase of construction. The paper describes the project background and details the reasons the NEXT beam was selected for Queens Blvd. Situations that are optimal for using the NEXT Beam will be described and the inherent advantages this system realizes in terms of stability and weight (dead load) will be shown. Additionally, the paper will touch on the LRFD Design requirements for the NEXT beam.