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Muir L.,Structural Steel Consultant | Duncan C.J.,American Institute of Steel Construction
Structures Congress 2011 - Proceedings of the 2011 Structures Congress | Year: 2011

The 14th Edition of AISC's Steel Construction Manual will be available in the summer of 2011. The new manual includes and is based on the 2010 AISC Specification for Structural Steel Buildings. Because of the new specification, as well as some other modifications to the connection design procedures, the 14th Ed. Manual will include revisions to some of the existing 13th Ed. tables. Many of the changes in the 2010 Specification are clarifications and minor adjustments, along with some important substantive changes in Chapter I, composite design, and a new Chapter N on quality control and quality assurance. Some of the other notable revisions include: • Revised scope statement related to seismic design (Chapter A) • Structural integrity is addressed (Chapter B) • Stability design procedures are reorganized (Chapter C, Appendices 7 and 8) • Revised the available shear strength values for bolts (Chapter J) • Revised the slip-critical strength limit state for bolts (Chapter J) • Tabulated the HSS connection design equations (Chapter K) • New Appendix on Inelastic Analysis and Design (Appendix 1) In addition to the changes to the Specification, several changes and improvements related to connection design were also made to the Manual. These include: • Revised bolt value tables for both bearing and slip-critical connections (Part 7). • Revisions and additions to the eccentrically loaded weld group tables (Part 8). • Clarifications to the discussion of connecting elements subject to flexure (Part 9). • Revisions to the design procedure for conventional single-plate shear connections (Part 10). • A revised discussion on the design of flexible moment connections (Part 11). © ASCE 2011.

News Article | October 31, 2016
Site: www.prweb.com

Modjeski and Masters, a nationwide leader in the design, inspection, and rehabilitation of all bridge types, including long-span and movable structures, today announced that Michael F. Britt will take over the role of President, effective January 1, 2017. As President, Britt, who has served as Senior Vice President at Modjeski and Masters since 2012, will be responsible for executing the firm’s strategic direction, safeguarding long-term success, and guiding complex projects at a managerial and technical level. Dr. Barney Martin, who currently holds the position of President and Chief Executive Officer, will continue to guide the company’s strategic direction in his role as Chief Executive Officer. “With his unique expertise, leadership experience, and drive, Mike is a perfect fit for this role,” said Dr. Martin. “Mike understands the industry, as well as its constantly evolving facets. He has the foresight to bring innovation to the way we do things here and is open to new ideas that will take us where we want to go in the future. I am confident that Mike will forge new relationships and expand Modjeski and Masters’ portfolio of new delivery and design-build projects while staying true to firm values: trust, innovation and value.” Mr. Britt began his career with Modjeski and Masters in 1979 as a co-op student while attending Drexel University. Britt briefly left Modjeski and Masters in 1989 to serve as the Assistant Division Bridge Engineer in the Pennsylvania Division of the Federal Highway Administration. In this capacity, he oversaw ongoing design and construction activities to assure conformance to Pennsylvania Department of Transportation and Federal criteria. Upon being hired back full-time, he served as Director of Business Development for several years before being promoted to Associate in 1997. In 2012, he was promoted to Senior Vice President and Director of Business Development, where he has played a crucial leadership role in the continued growth of the company. Under his guidance, marketing and business development initiatives were streamlined and modernized. He also served critical roles with marquee clients including the Detroit International Bridge Company, the Pennsylvania Turnpike, the Delaware River and Port Authority, and the District Department of Transportation. “Given the fact that I started my career with Modjeski and Masters as a co-op student and that I am now appointed to be its new President is an accomplishment that I am honored to accept,” said Mr. Britt. “Modjeski and Masters has a 123-year long and proud history of bridge work in the United States,” said Britt. “We have an incredible team with technical expertise and experience in all areas of bridge engineering, and I look forward to working together to build the future of our firm.” Mr. Britt earned a B.S. and M.S., Civil Engineering from Drexel University in 1983 and 1990, respectively. He is a Professional Engineer in Pennsylvania and is a member of the American Institute of Steel Construction. “Mike Britt has been instrumental in developing strategic vision for the firm”, said Dr. Zolan Prucz, Chairman of Modjeski and Masters. “As we continue to grow, expand services and adapt to changes in our industry, his appointment to the position of President is a natural choice. With his intimate knowledge of the firm’s capabilities of and the industry trends, his strong relationships with clients, and his managerial and technical expertise, I am certain Mike will provide the leadership that the firm needs well into the future.” About Modjeski and Masters Modjeski and Masters is one of the world’s leading bridge engineering firms, with a reputation for technical excellence and innovation that goes beyond current standards. Established more than 120 years ago, the firm is responsible for the design and maintenance of some of our nation’s most recognizable structures. Services include fixed and movable bridge design, inspection and rehabilitation, and all facets of life-cycle maintenance, research and code development. For more information, including in-depth videos of Modjeski and Masters at work, please visit http://www.modjeski.com.

News Article | February 26, 2017
Site: www.prweb.com

Tampa Tank Inc.-Florida Structural Steel (TTI-FSS), a globally recognized steel fabrication company, has completed installation of a 507-kilowatt solar photovoltaic (PV) system at one of its three Tampa-based manufacturing facilities. At a half a megawatt, this is the largest solar installation for an industrial plant in Hillsborough County, Florida, and one of the largest in the state. Solar Advantage installed the 1,492 Canadian Solar 340 panels and 51 inverters for property developer Shepard Capital Partners, from whom TTI-FSS leases the facility. TTI-FSS expects to save some $75,000 – 80,000 in energy costs the first year by drawing power first from the solar installation and secondly from local supplier TECO Energy. David Reed, principal at Shepard Capital Partners, member of TTI-FSS' advisory board and founder of the nonprofit Sustany Foundation, explained, “Solar energy is an appealing alternative power source because it substantially reduces operating costs while securing a large portion of the company’s power needs for 25 years at a lower fixed price, from 13 cents per kilowatt currently to 3 cents per KW. In addition, TTI-FSS will benefit from a federal investment tax credit worth 30 percent of the system’s cost and the Modified Accelerated Cost Recovery System (MARCS) bonus depreciation of 50 percent the first full year of operation.” He added, “We were looking for an opportunity to demonstrate how we can move away from carbon-based fuel use in a heavy industrial operation. Having worked with Solar Advantage President Martin Clewis at the Sustany Foundation, we quickly recognized the economic benefits of using solar power for TTI-FSS. Keeping our investment with a local company was also an appealing aspect of this project.” According to TTI-FSS founder Cal Reed, “We’re all concerned about the environment, so we were willing to consider solar energy as an alternative resource after evaluating three important factors: One, the return on investment; two, the viability of the manufacturing plant structure itself to support the number of solar cells necessary without having to reinforce it; and, three, the proposal from Solar Advantage to provide the quality and savings we expected at a reasonable cost. Fortunately, all three factors aligned to make this project possible.” The solar power cells capture sunlight and turn it into direct current (DC) electricity, which flows to the inverters to convert it into alternating current (AC) electricity. The AC electricity moves to the breaker box, where it is used to power the facility’s lights, tools and other manufacturing equipment. The installation is complete and will be put in operation within the month once the bi-directional solar meter is installed by Tampa Electric. Solar Advantage President Martin Clewis emphasized the customized solutions his company employs for clients. “We used a diversified approach for the inverters in this particular project. Instead of one huge truck-sized inverter, we installed 51 small solid-state inverters, made in California, scattered throughout the array of panels. This minimizes the size of the system footprint and cuts down on potential service and repair-related down time.” About TTI-FSS Tampa Tank Inc. and Florida Structural Steel (formerly Florida Miscellaneous Steel Company) have been in the industrial steel business for more than 60 years. The company provides complete design, shop fabrication, shipment, field erection, inspection and testing of welded steel products for the petroleum, chemical, pulp and paper, mining, electric power, water and waste water industries. TTI-FSS is a major participant in the fabrication of major and minor bridges, including fracture-critical, movables and railroad, as well as standard plate girder and box girder bridges. With a sophisticated paint endorsement, the company can provide modular steel fabrications and structural steel components for the commercial, industrial and transportation sectors. The company operates across North America, Central and South America and in the Caribbean, including Bermuda, the Bahamas, Suriname and Guyana. TTI-FSS can ship every possible option, including massive products, from its deep-water port. TTI-FSS is American Society of Mechanical Engineers (ASME) and American Institute of Steel Construction (AISC) certified. For more information, visit the company’s web site at http://www.tti-fss.com . About Solar Advantage Solar Advantage was established in 2011 by Martin Clewis, who created a solar power generation system for his company’s soybean extrusion facility. Solar Advantage has years of experience in solar projects, including industrial, commercial and residential installations. The company has installed solar energy systems in Florida, the Caribbean and Asia. Solar Advantage is a state certified solar and master electrical contractor, which gives it the ability to manage nearly every aspect of any solar project. The team includes several financial experts to help businesses and homeowners take advantage of solar tax credits financing and utility incentives. Mr. Clewis is a member of the National Association of Certified Energy Practitioners in the PV Installation category. The firm has received stop service awards from Angie’s List and excellent reviews from Solar-Reviews, EnergySage and Google. Learn more at http://www.solaradv.com . About Shepard Capital Partners Shepard Capital Partners, LLC invests proprietary and investor funds in lower middle market companies, primarily in Florida and the Southeast. The firm seeks to partner with established, cash flowing businesses where the primary constraint to growth is access to capital. Investments are optimally structured to provide the portfolio company with the growth capital it requires in an efficient, flexible manner. Go to http://www.shepardcap.com for more details. About the Sustany Foundation The Sustany Foundation mission is to enhance the quality of life in the Tampa Bay community by promoting sustainability. Founded in 2007, Sustany supports sustainability through education and programs which advance economic prosperity, environmental stewardship and social responsibility via efficient and effective aggregation and investment of resources. Learn more at http://www.sustany.org .

Liu D.,University of Kentucky | Davis B.,University of Kentucky | Arber L.,American Institute of Steel Construction | Sabelli R.,Seismic Design
Engineering Journal | Year: 2013

Torsional buckling (TB), an applicable limit state for W-shape members subject to axial compression, often controls when the torsional effective unbraced length exceeds the minor-axis flexural buckling effective unbraced length. Constrained-axis flexural-torsional buckling (CAFTB) is a potential limit state for W-shape members that are constrained to buckle with the center of twist at a location other than the centroidal axis, as is the case for a typical beam with one flange braced by a diaphragm and the other unbraced. Manual calculation of the TB or CAFTB available compressive strength is a somewhat lengthy process, especially when the section is slender for axial compression, and no design aid currently exists in the AISC Manual. This paper provides tables that facilitate the determination of TB and CAFTB available compressive strengths. Several example calculations are also provided.

Lopez Del Puerto C.,University of Puerto Rico at Mayaguez | Mrozowski T.L.,Michigan State University | Kruth L.F.,United States Steel Corporation | Schlafly T.J.,American Institute of Steel Construction | Bas O.I.M.,University of Puerto Rico at Mayaguez
ASEE Annual Conference and Exposition, Conference Proceedings | Year: 2015

The paper presents the results of a collaborative effort between two US universities, The American Institute of Steel Construction (AISC) and a steel fabricating corporation to develop and implement a bilingual (English and Spanish) safety training program on warehouse worker hazards for structural steel fabricating and supply companies. Structural steel fabricators receive structural steel material, fabricate structural elements for steel framed buildings and bridges and then ship fabricated material to projects. Steel service centers purchase material from steel mills and distribute steel to structural steel fabricators. Workers in structural steel fabricating and supply companies are at risk of fatal and non-fatal injuries. In addition to exposure to common warehouse worker hazards in other industries, structural steel warehouse workers are exposed to risks related to the large, heavy and variable nature of the steel material they handle. Furthermore, some warehouse workers employed in structural steel fabricating and supply companies speak Spanish as their native language and have limited English fluency that puts them and their co-workers at an increased risk of fatal and non-fatal injuries. Structural steel warehouse workers face many barriers to receiving adequate safety training that is in a language and manner that workers can understand. The structural steel fabricating and supply industry includes many small companies that are geographically distributed among the United States and may lack the resources to develop and implement adequate training programs for their workers. When training is available, it is often offered in English which limits the Spanish-only worker's ability to understand the training and may increase the risk of injuries due to employers mistakenly believing that workers are trained to safely perform their duties. In order to address the barriers to adequate training, the research team successfully obtained a training grant from the Occupational Safety and Health Administration (OSHA) to develop an English and Spanish Warehouse Worker training curricula for use with worker training. The training consists of peer to peer activity based learning. The training covers potential hazard exposures that flow from warehousing and processing tasks such as off-loading and loading materials, movement of material by overhead crane, forklift, loaders or by hand, falls from equipment or loads, struck by or caught between accidents, musculoskeletal injuries due to lifting, bending or working overhead, electrical equipment operation and maintenance requiring safe practices and lock-out/tag-out, and chemical processes. Educational materials consist of a six contact hour worker training which includes activity based learning, PowerPoint presentations, demonstration materials, trainee workbooks and a learning outcomes assessment. This paper contributes to the body of knowledge by highlighting the results of a partnership between academia, a professional society and a company to develop and implement a safety training program with the common goal of decreasing the number of fatal and non-fatal injuries among structural steel warehouse workers. The paper concludes with recommendations for those interested in forming partnerships to develop and implement training programs. © American Society for Engineering Education, 2015.

Schlafly T.J.,American Institute of Steel Construction | Miller D.K.,Lincoln Electrical Co.
Welding Journal | Year: 2016

AWS D1.1/D1.1M:2015, Structural Welding Code ? Steel, has undergone several changes and now is ready for implementation. Previous codes prohibited wrapping fillet welds around opposite sides of a common plane, which had the side effect of preventing seal welds from being deposited. The new revised code now permits wrapping welds to opposing planes where contract documents indicate welds are to be continuous. D1.1 now provides some limited conditions where non-fusible backing can be used with pre-qualified joint details. New base metals and grades have now been added to Tables 3.1 and 3.3. notable additions include ASTM A1085, A91 Grade 70, ASTM A501 Grade B, and ASTM A1018 structural steel Grades 30-40 were moved from Group II to Group I. provisions regarding splices of members and splices of elements of members have been revised to respond to frequent questions and fabrication conditions. The fatigue provisions for non-tubular members have been updated.

Geschwindner L.F.,American Institute of Steel Construction
Engineering Journal | Year: 2010

The 2005 AISC Specification for Structural Steel Buildings includes a stiffness reduction factor, tb, in Appendix 7 to be used in the direct analysis method to account for the presence of residual stresses and their influence on the second-order effects of frame behavior. The 2005 Commentary includes a stiffness reduction factor, ta, to be used along with the effective length nomograph to account for the influence of column inelasticity due to residual stresses on effective length. These two stiffness reduction factors are intended to account for the same effect yet they are different. This paper provides the background for these two factors, and it will demonstrate that tb is the more correct stiffness reduction factor. The 2010 AISC Specification will recommend its use with both the direct analysis method and the effective length nomograph.

Geschwindner L.F.,American Institute of Steel Construction
Engineering Journal | Year: 2010

The use of φ = 0.9 and Ω = 1.67 with the provisions in Section F13.1 of AISC 360-05 (AISC, 2005) to account for the reduction in flexural strength for a beam with holes in the tension flange has been questioned several times since the publication of the Specification for Structural Steel Buildings in 2005. The intent of this paper is to review and provide justification for the use of the resistance/safety factors within the 2005 Specification provisions for the impact on flexural strength of holes in the tension flange.

Geschwindner L.F.,American Institute of Steel Construction | Gustafson K.D.,American Institute of Steel Construction
Engineering Journal | Year: 2010

Specific prescriptive structural integrity provisions have been added to both model and local building codes since the collapse of the buildings at the World Trade Center site in 2001. The first building code to incorporate specific requirements was the 2008 New York City Building Code, which was followed quickly by the 2009 International Building Code. This paper demonstrates how properly designed single-plate shear connections comply with the structural integrity provisions of IBC 2009 and also make appropriate comparisons with NYC 2008.

Arber L.,American Institute of Steel Construction | Wang M.,Stanford University | McManus P.,S.E Martin Martin Wyoming
Engineering Journal | Year: 2015

This paper presents tabulated compressive strengths of double-tee members, which are comprised of two WT members oriented with their flanges back to back (referred to as "2WTs" or "double WTs" hereafter). The benefits and typical use of these members are described, including schematic details of connection designs. All WT members built from the WT7 and WT6 series are included in the table, which gives available strengths in both ASD and LRFD. Slenderness effects and the effects of shear deformations of intermediate connectors are taken into account. Copyright © 2015 by the American Institute of Steel Construction.

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