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Juan A.,Rice University | Hughes C.,Walter P. Moore | Fang Z.,University of Texas at Arlington | Bedient P.,Rice University
Journal of Irrigation and Drainage Engineering | Year: 2017

This paper evaluates watershed-scale hydrologic performance of low-impact development (LID) features at two catchments in the Houston, Texas, region. White Oak Bayou is a traditional urban watershed that is frequently plagued with flooding. In contrast, The Woodlands is a master-planned suburban community designed to preserve its natural hydrology by implementing large-scale conservation features. The objectives of this study are threefold: (1) to propose a method to simulate small-scale infiltration-based LID features over a large area by using a distributed hydrologic model; (2) to quantify the cumulative hydrologic responses of watershedwide LID implementation; and (3) to compare the flood reduction potential between two distinct LID strategies (conservation LID and retrofit LID). Conservation (master-planned) LID integrates large-scale features (e.g., riparian buffers and swales) early in a watershed's development, whereas retrofit LID implements site-scale features (e.g., green roofs and rain gardens) after the watershed has been fully developed. The results of this study demonstrate varying degrees of flood reduction (i.e., peak discharge and runoff volume) at the watershed outlets with respect to different LID features and rainfall events. The results also showed that although retrofitted watersheds could not quite match the hydrologic performances of master-planned watersheds, they could still enjoy the benefit of flood reduction during smaller storms. © 2016 American Society of Civil Engineers.


Valdez M.,FHWA | Cheu R.L.,University of Texas at El Paso | Duran C.,Walter P. Moore
Transportation Research Record | Year: 2011

This research examined the operations of a four-legged, two-lane modern roundabout with different combinations of approach volumes. Because of the insufficient number of roundabouts to collect field data, experiments were performed with the VISSIM microscopic traffic simulation model. The model's parameters were calibrated with real data collected at a four-legged, two-lane modern roundabout. Different combinations of approach volumes, which ranged from 400 to 1,600 vehicles per hour, were simulated to create relatively high or low traffic demand in one or two approaches. The performance of each roundabout approach was measured by average control delay and level of service. The results of the experiments highlight the potential operational issues of four-legged, two-lane modern roundabouts. The results are presented in three charts that may serve as a quick reference guide for engineers to determine whether a roundabout is a feasible type of intersection control for a given set of design volumes before in-depth engineering analysis is performed.


News Article | December 21, 2016
Site: www.prweb.com

SAE International announces that Kasra Ghahremani, PhD, Structural Diagnostics Engineer with Walter P. Moore, is winner of the Henry O. Fuchs Student Award. Established in 1991, this award recognizes a graduate or recently graduated student (i.e. post doctorate or new professor) that is working in the field of fatigue research and applications. The purpose of this award is to promote the education of engineering students in the area of fatigue technology. This award honors the memory of Professor Henry O. Fuchs. Professor Fuchs participated in the SAE Fatigue Design & Evaluation Committee's research projects, was a member of the faculty who founded the SAE Fatigue Concepts in Design short course, published extensively in SAE and elsewhere in the technical community, and actively participated in the Surface Enhancement Division of the Committee which is responsible for many standards relating to surface treatments of metals for withstanding fatigue damage. Dr. Ghahremani’s research during his graduate studies was primarily focused on the fatigue performance, assessment, and retrofitting of metal structures in the long-life regime. His research outcomes have been published in co-authorship with his scientific advisers and other collaborators in 20 journal and conference research papers. Prior to joining Walter P Moore, Dr. Ghahremani was a Post-Doctoral Research Fellow at George Mason University conducting research on detecting structural damage in 3D point clouds. He has received several national and institutional awards and scholarships including the prestigious Natural Sciences and Engineering Research Council of Canada (NSERC) Scholarship. Dr. Ghahremani received his PhD and MASc degrees in Structural Engineering from the University of Waterloo and BSc in Civil Engineering from Sharif University of Technology. SAE International is a global association committed to being the ultimate knowledge source for the engineering profession. By uniting more than 127,000 engineers and technical experts, we drive knowledge and expertise across a broad spectrum of industries. We act on two priorities: encouraging a lifetime of learning for mobility engineering professionals and setting the standards for industry engineering. We strive for a better world through the work of our philanthropic SAE Foundation, including programs like A World in Motion® and the Collegiate Design Series™.


News Article | October 12, 2016
Site: www.labdesignnews.com

One of imec Florida’s objectives is to bring high-tech semiconductor manufacturing jobs to the state, and many key players are involved to realize this strategic plan: imec, ICAMR (The International Consortium for Advanced Manufacturing Research), Florida State, UCF, Osceola County, the Orlando Economic Development Council and the Florida High Tech Corridor Council. The current planned investment is roughly $250 million. Initial funding for imec Florida stems from Osceola County and the University of Central Florida. Officials involved are leveraging their investment, and imec’s international reputation, to draw more substantial industry funding. A full service design center from the imec and ICAMR teams is under development at a 350-acre area known as the Florida Tech Farm. The creation of the imec Design Center will position Osceola County as the heart of smart sensor innovation. The imec Design Center will add a much-needed suite of services for companies that want to develop and manufacture innovative electronics, but cannot currently do so in the U.S. due to aspects such as company size, yield and cost. The imec Design Center will focus on products and systems critical to U.S. markets, including healthcare, aerospace, security and transportation. It will also provide IC designs that will drive ICAMR’s manufacturing research. Furthermore, ICAMR is building a new 200mm cleanroom in the area. The currently planned cleanroom surface is roughly 40,000 sf and is intended for companies in need of dedicated R&D space whose focus is on the development of advanced manufacturing technologies. Skanska USA’s Orlando office is the general contractor for the project which is handling design and building services for the 100,000 sf research and manufacturing facility. The construction of the facility is based on an elevated foundation that supports the stringent standards for a vibration and particle free cleanroom with the flexibility to drop utilities through the subfloor. Construction began in October 2015, and the cleanroom is expected to be operational in April 2017. In parallel, imec is hiring the technical team operators, process engineers, ASIC designers and system architects. The first functional prototypes developed in the ICAMR cleanroom are slated to become available in 2018. The project team is comprised of Skanska USA (construction), HOK (architecture), AGI Abbie Gregg Inc. (cleanroom design), Vanderweil (MEPF engineering), Walter P. Moore (structural engineering), and Hanson, Walter & Associates Inc. (civil engineering).


Drerup M.J.,Walter P. Moore | Erdem I.,Exponent, Inc. | Anthony R.W.,Anthony and Associates Inc.
Forensic Engineering 2012: Gateway to a Better Tomorrow - Proceedings of the 6th Congress on Forensic Engineering | Year: 2013

This paper presents an in situ and laboratory investigation conducted to diagnose unsatisfactory performance of new engineered wood flooring installed in an existing building. Shortly after installation, areas of flooring began to exhibit uplift and bowing (warp). Warp was more pronounced during the winter months, when indoor relative humidity was significantly below the flooring manufacturer's stated minimum. In addition to the correlation between low humidity and warp, other possible contributing factors were also considered; these included materials, construction of the finished product, installation, and end-use conditions. The investigation included detailed documentation of floor condition, building modifications, history of reported flooring defects, and apartment occupancy; plus laboratory environmental testing. An environmental test chamber was used to expose new flooring to a range of relative humidity regimes, including the full range permitted by the flooring manufacturer (35% to 65% RH), and the lower range experienced during the winter months (as low as 15% RH). Testing and analysis confirmed that the flooring performs satisfactorily within the allowable humidity range, and that poor performance at lower relative humidity was attributable to construction layup of the flooring product, the method of installation, and the building environmental conditions. © ASCE 2013.


Samarajiva P.,Walter P Moore | Gosain N.,Walter P Moore
Structures Congress 2011 - Proceedings of the 2011 Structures Congress | Year: 2011

Built 100' deep into dolomite bedrock, the influent pump station at Valley Creek Wastewater Treatment Plant in Alabama is approximately 360' long and 230' wide. Several elements of this underground structure failed in April 2005 only a few weeks after its commissioning, partially flooding the pump station and rendering it inoperable. After the causes of the failure were determined, the engineer presented several repair options. The accepted repairs included wall and floor thickening using 25,000 epoxy grouted steel dowels, uplift stabilization of the entire underground structure using 700 high-capacity rock anchors, installation of concrete and steel transverse bracing for previously laterally unsupported basement walls, modifications to various structural elements for reconfigured load paths by new transverse bracing, hydrophilic urethane crack injection in the mat slab to reduce groundwater infiltration, and epoxy injection of numerous cracked structural concrete elements. Despite the magnitude and the challenges of the repairs, the pump station was restored within three years of the failure and is fully operational. © ASCE 2011.


Webster M.D.,Simpson Gumpertz and Heger | Meryman H.,ScrapD | Kestner D.M.,Walter P Moore
Structures Congress 2011 - Proceedings of the 2011 Structures Congress | Year: 2011

The SEI Sustainability Committee formed a Carbon Working Group (CWG) in December 2009, chaired by this paper's lead author. The CWG is developing a white paper addressing building structure and carbon emissions which will be completed this year. The present paper is an interim report describing the CWG's findings to date. Carbon Working Group Members: Mark D. Webster, chair Adam Slivers Kathrina Simonen Ali Mehrabian Kenneth Bland Dirk Kestner Lindsey Maclise Greg Briggs Russ Miller-Johnson Helena Meryman Sandeep Mathur Jeralee Anderson Tona Rodriguez-Nikl. © ASCE 2011.


Samarajiva P.M.,Bechtel Corporation | Gosain N.,Walter P Moore
Forensic Engineering 2012: Gateway to a Better Tomorrow - Proceedings of the 6th Congress on Forensic Engineering | Year: 2013

The bell tower of an historical church in Houston, TX was noted to be leaning. Long-term tilt survey over a period of approximately six years revealed that the bell tower movement was cyclical in nature but gradually increasing. Field investigation revealed that expansive soils under the bell tower foundation was the primary reason for distress. Structural analysis revealed that the tilt of the bell tower was unlikely to cause stability problems. However, physical evidence and additional analysis indicated that cyclical movements of the bell tower would continue to cause visible distress in less structurally significant parts of the bell tower if the movement was not arrested. Given the historical significance of the bell tower, the church officials elected to correct the tilt as well to stabilize foundation movement. Specialized foundation repair techniques were used to correct the tilt and stabilize the foundation. © ASCE 2013.


Tabsh S.W.,American University of Sharjah | Mitchell M.M.,Walter P Moore
Structural Engineering and Mechanics | Year: 2016

There are constraints on truck weight, axle configurations and size imposed by departments of transportation around the globe due to structural capacity limitations of highway pavements and bridges. In spite of that, freight movers demand some vehicles that surpass the maximum size and legal weight limits to use the transportation network. Oversized trucks serve the purpose of spreading the load on the bridge; thus, reducing the load effect on the superstructure. For such vehicles, often a quick structural analysis of the existing bridges along the traveled route is needed to ensure that the structural capacity is not exceeded. For a wide vehicle having wheel gage larger than the standard 1830 mm, the girder distribution factors in the design specifications cannot be directly used to estimate the live load in the supporting girders. In this study, a simple approach that is based on finite element analysis is developed by modifying the AASHTO LRFD's girder distribution factors for slab-on-steel-girder bridges to overcome this problem. The proposed factors allow for determining the oversized vehicle bending moment and shear force effect in the individual girders as a function of the gage width characteristics. Findings of the study showed that the relationship between the girder distribution factor and gage width is more nonlinear in shear than in flexure. The proposed factors yield reasonable results compared with the finite element analysis with adequate level of conservatism. Copyright © 2016 Techno-Press, Ltd.


Toellner B.W.,Thornton Tomasetti | Watkins C.E.,Walter P. Moore | Abbas E.K.,Virginia Polytechnic Institute and State University | Eatherton M.R.,Virginia Polytechnic Institute and State University
Journal of Constructional Steel Research | Year: 2015

Steel moment resisting frames rely on large inelastic strains in the beam plastic hinge region to dissipate seismic energy during an earthquake and protect the building against collapse. To limit the potential for premature fracture and because of a lack of test data, fasteners, attachments and defects are prohibited in the plastic hinge region, also referred to as the protected zone in the AISC Seismic Provisions. However, unauthorized attachments and defects occur in many buildings in practice. A set of twelve full-scale moment connection tests were conducted to explore the effect of powder actuated fasteners (PAFs) and puddle welds on the seismic performance of steel moment connections. Both reduced beam section and extended end plate connections were tested with W24 × 62 and W36 × 150 beams. Five specimens included PAFs or puddle welds representing typical steel deck attachment to the top flange of the beam. Three of the specimens included PAFs in a grid over the top and bottom flange and on the web. All twelve specimens passed the qualification criteria for special moment resisting frames (SMRFs) in the AISC Seismic Provisions as they were subjected to a cyclic displacement protocol up to 4% story drift while retaining 80% of their nominal plastic moment capacity. Therefore, the tested moment connection configurations with PAFs and puddle welds were found to produce ductile SMRF type seismic performance. Furthermore, PAFs and puddle welds were found to have negligible effect on cyclic envelope, moment capacity, energy dissipation and strength degradation prior to fracture. © 2014 Elsevier Ltd.

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