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IN MEMORIAM - SEAoNY ... Murray Engineering, Robert Silman Associates (RSA), Thornton Tomasetti (TT), Leslie E. Robertson Associates (LERA), and STV joined the students in their pursuit

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    Magazine for the Structural Engineers Association of New York 2015 VOLUME 20 NO. 1

    cross sections

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    James Vignola, PE

    For advertising inquiries, please contact our Sponsorship Committee at [email protected]

    Editor’s Message3

    President’s Message3

    Six Pointers on Steel Pricing for Structural Engineers By Simon Shim, PE

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    Commuting Through the Sky An Engineering History of the Roosevelt Island Tramway

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    By Damayanti Chaudhuri, PE

    CONTENTS

    SEAONY AROUND TOWN

    FEATURES

    Editor’s Message

    As we enter 2015 Seaony is on track for another strong year. SEAoNY reinforced our relationship with the Center for Architecture and the AIA , we recently solidified a three year relationship with the CFA. This agreement gives SEAoNY a stable home allowing us to focus on our mission as well as creating opportunities for us to form joint ventures with the AIA and explore programs of common interest to our membership. This year will be an exciting year for structural engineering in the New York area and for SEAoNY membership. New York City is seeing a boom in cutting edge projects and New York engineers are involved in major projects globally. Many of these will be on display at the multiple structures conventions that are coming to the north east and NYC over this year. We are excited to be able to collaborate and support some of these events such as CTBUH, EERI and ASCE where many of our members and projects will be highlighted. Our many committees have created a series of great events, Structure Quest and many of our monthly events draw large crowds. We will soon be having our full Day seminar on Foundation Construction Issues and will be having roundtables and panels to engage both our membership and our counterparts in the industry to discuss how to improve and reinforce the art of structural engineering. Looking forwards to these great events and the efforts of our membership.

    Regards, Eli

    Eli Gottleib, PE Justin Den Herder, PE President’s Message

    Officers

    Publications Staff

    SEAoNY 536 LaGuardia Place New York, NY 10012

    cross sections 2015 VOLUME 20 NO. 1

    www.seaony.org

    President

    President-Elect

    Past President

    Secretary

    Directors

    Justin Den Herder, PE Editor in Chief

    Alice Tao, PE Chief Graphic Designer

    Treasurer

    Douglas P. González, PE

    Eugene Kim, PE

    Jonathan Hernandez, PE

    [email protected]

    Adam Kirk, PE Chief Photographer

    Alice Oviatt-Lawrence

    Kriton Pantelidis

    Eytan Solomon, PE

    Hooman Tavallali, PE Regular Contributors

    Justin Lawson, PE

    Samuel Ng, PE

    Allan James Olson, PE, LEED AP

    Justin Den Herder, PE Assistant Graphic Designer

    Brian Falconer, PE, SE, LEED AP, SECB

    Alastair C. Elliott, PE, LEED AP

    Benjamin Pimentel, PE

    Sara Steele, PE

    Rebecca Jones, PE, LEED AP BD+C

    Law Abiding Citizens A General Review of Professional Liability Law for Engineers By Jessica L. Rothman, Esq

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    Dear Readers,

    This is our first publication of the new year. Thanks to all who have contributed to the making of this issue.

    We are taking strides at the Publications committee to maintain a consistent quarterly publishing schedule so that you can come to expect a new issue of Cross Sections at specific times of the year; but we need help. Given that the magazine is run on a volunteer basis, busy schedules often intervene and delay the magazine’s release. What we need is a new wave of volunteers to rise up and pitch in. Volunteering for the Publications Committee does not mean that you will be relegated to the role of writing, although of course, we always encourage volunteers to write about topics that impassion them. We need help with organizational skills, experience in graphics and layout, in obtaining and tracking advertisements, editing, etc. We also need help in brainstorming new article ideas and we need to cast a wide net for them. If you have a colleague with a pertinent thesis topic or an abstract for a presentation please reach out to them and ask if they would be interested in publishing their work in Cross Sections. It can be great exposure for them and simultaneously serve to enlighten our membership.

    Additionally, our meetings are fun! If nothing else, please come to just to check out the group. Our next meeting will be at a pub, Fresh Salt on March 26th at 6PM. We hope to see you there!

    Regards, Justin

    The 5th Annual Structure Quest By Jennifer Tsang

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    The Roosevelt Island Tram as it looks today post-renovations. This tram is descending towards the Roosevelt Island Station. The Ed Koch (Queensboro) Bridge is seen on the left and Midtown Manhattan is in the background.

    ON THE COVER

    PHOTO: ADAM KIRK

    Eli Gottleib, PE

    Daniel A. Cuoco, PE, a former President and CEO of Thornton Tomasetti, passed away on September 21st, 2014.

    A respected and distinguished leader, Dan was involved in numerous building failure investigations and new building designs over a 4-decade career at TT, from where he retired in 2011. He will be widely missed by the structural engineering community, where he was an active presence.

    One of Dan’s many projects at TT was the Roosevelt Island Tramway, which is featured on Page 10 in this issue.

    PHOTO: COURTESY OF THORNTON TOMASETTI

    IN MEMORIAM Dan Cuoco

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    On December 3, 2014, SEAoNY hosted an informative seminar regarding structural steel costing in NYC, presented by Robert Abramson, the President of Bramco Plus LLC.

    Why should engineers understand the basics of structural steel pricing? Nobody doubts the answer is to bring an economical design to the project and the owner. In general, structural steel pricing in New York varies between $3,800 ~ $6,800 / Ton.

    The seminar covered six key topics in steel pricing for “medium” complex structures:

    MATERIAL Mill Prices – Structural steel published prices are available on www. nucor.com

    Material Pricing: Mill Cost Estimate Material Cost $0.45/lbs Extras $0.03 Freight/Tax $0.04 Scrap Allowance $0.03 = $0.55/lbs equivalent to $1,100/ton

    DETAILING Detailing Cost Estimate = $70/HR x 1.5 HR/Ton = $105/Ton (Function of complexity & Technology)

    FABRICATION Today, modern steel facilities, with automated equipment and efficient factory layouts, are the leading source of steel fabrication, and are no longer referred as “shops.”

    Fabrication cost estimate average shop hour rate: $72/HR Fabrication Rate = $72/HR x 10.5 HR/Ton (7 Man hours per piece x 1.5 pieces/Ton) = $760/Ton

    FREIGHT Freight Cost Estimate = $600/HR = trucking rate x 10 hours per load x 18 Tons/load = $330/Ton

    ERECTION EQUIPMENT/CRANE Journeyman wages in New York City (union labor) = $220/HR (includes wages $47, vacation fund $18, pension & annuity $55, FICA & Fed. Medicare $15, W/C & Insurance $38, and 22% Mark-up $44)

    Erection is based on site logistics, determination of crane type and cost. Erection Cost per Hour = 28 men x $220/HR = $6160/HR (28-man crew per crane, IW hourly rate = $220/HR ) Favco costs/operators = $1,800/HR, Other Equipment = $1,000/HR Total = $8,960/HR

    SEAoNY Around Town

    Six Pointers on Steel Pricing for Structural Engineers

    Figure 1. Cost vs. psf diagram (Bramco Plus LLC)

    SIMON SHIM, PE THORNTON TOMASETTI

    ERECTION LABOR Erection Cost Estimate= $8,960/HR = $71,680/Day (8 HRs) Assuming Erection Productivity Rate = 28 pieces/day, 1 piece = 1,500 lbs, 28 x 1500 lbs = 21 Tons/day = $71,680 / 21 Tons = ~$3400/Ton COST TOTALS PER TON (PERCENTAGE)

    Material: $1100 (20%) Detailing: $105 (2%) Fabrication: $760 (13%) Freight: $330 (5%) Erection: $3,400 (60%) Total: $5,695/Ton

    Design Economy: Least weight or least cost? Thanks to state of the art technology, material take-offs can be done electronically to a high degree of accuracy. However, structural steel fabrication and erection estimates are very specific to the complexities of each project. Material prices are flat, while labor costs always rise, with the result that cost is not proportional to lbs/ sq. ft (psf). In other words, the key driver of the overall steel cost is not how many lbs/sq. ft are in the design, but rather the cost per erection piece. The key is to reduce your square foot costs.

    A project in NYC of $5,695/Ton should be better described as costing $3,800 / erection piece.

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    The SEAoNY University Outreach Committee held the 5th Annual SEAoNY “Structure Quest” on November 8th, 2014. The event was co-sponsored by The Cooper Union for the Advancement of Science and Art. Students represented schools from Columbia University, Stevens Institute of Technology, New York University (NYU), Princeton University, New York Institute of Technology (NYIT), Manhattan College, and Cooper Union. Employees from firms Murray Engineering, Robert Silman Associates (RSA), Thornton Tomasetti (TT), Leslie E. Robertson Associates (LERA), and STV joined the students in their pursuit of becoming Structure Quest winners. Students and working engineers were split into a total of 10 teams, and were then given a series of scavenger hunt questions based on significant structures in the NYC area. Unlike