Presentation on theme: "SUGGESTIONS FOR IMPROVING THE STRUCTURAL STEEL SHOP"— Presentation transcript:
1SUGGESTIONS FOR IMPROVING THE STRUCTURAL STEEL SHOP DRAWING PROCESSOur Topic is “”The Committee is a volunteer group of SEAC members and RMSCA members. We meet once a month and work on various topics of mutual interest.SEAC/ RMSCA Steel Liaison Committee
2WHYThe process of preparing shop drawings has become the most time consuming and unpredictable part of the fabrication processWe decided to focus on the shop drawing issue for this reason.There appears to be a disconnect between the expectations of the fabricators and the expectations of the engineers. We are just trying to get to an understanding between the parties.
3Participating Members of the Committee Jim Edwards, Quality Steel Services, Inc.Dave Henley, P.E., VulcraftRichard Huddleston, Zimkor LLCRobert Leberer, P.E., Anderson & Hastings Consulting Engineers, Inc.Curtis Mayes, P.E. LPR Construction Co.Nick Miller, LPR Construction Co.Eric Moe, P.E. Puma SteelDave Schroeder, MortensonTom Skinner, P.E., JVA Consulting Structural EngineersMaynard Trostel, P.E., Puma SteelJules Van de Pas, P.E., Computerized Structural DesignBruce Wolfe, P.E., Structural Consultants, Inc. (CHAIR)Bill Zimmerman, P.E., Zimkor LLCThese are the participating members.If I left anyone off the list I apologize.If you are interested in joining this group. You can do that. Participation is open to all SEAC and RMSCA members.You do not need to make a long term commitment. Just give Bruce a card and he will put you on his distribution list for meeting announcements.You do benefit as an engineer from participating in this group. If you really are interested in how your steel structures get built. And want to understand what the fabricators and erectors do to build those structures, I urge you to consider joining us.
4DisclaimerSEAC, RMSCA, nor its committees, writers, editors and individuals who have contributed to this publication make any warranty, expressed or implied, or assume any legal liability or responsibility for the use, application of, and/or reference to opinions, findings, conclusions, or recommendations included in this document.This document does not replace and is not to be used as an adjunct to the current edition of the American Institute of Steel Construction (AISC) “Code of Standard Practice for Steel Buildings and Bridges” or Case document 962D.The following is a discussion of the current status of the process of preparing structural steel shop drawings.This paper was prepared by the SEAC/ RMSCA Steel Liaison Committee, a coalition of Front Range Fabricators, Detailers, Erectors and Structural Engineers (EOR) dedicated to improving the steel construction industry. The intent of this paper is to propose suggestions for improving the structural steel shop drawing process. The process of preparing shop drawings has become the most time consuming and unpredictable part of the fabrication process.That’s the fine print.
5Topics PURPOSE of Shop Drawings The Normal Shop Drawing PROCESS PROBLEMS in preparing and approving the shop drawingsRECOMMENDATIONS to improve the shop drawing processWe broke this issue down into 4 topics.I will cover purpose and processMy part really is not going to cover anything new. I just explain what we do and why. Setting the background for my colleagues.Richard will talk about the problems that occur in the processAnd Bruce will finish up by providing some recommendations.We then hope to facilitate a discussion with all of you to talk through some of these issues.NO WAR STORIES, PLEASE. We all have them. We are really are looking to have a constructive discussion.
6PURPOSE and PROCESS of Shop Drawings Each participant has a different Perspective, Role and Contractual Responsibility:Fabricator /DetailerErectorGeneral Contractor or Construction ManagerEngineerArchitect
7SHOP DRAWING PROCESS DETAILER ERECTOR GC/CM REVIEWS FORWARDS TO ARCHITECTFABRICATER PREPARES SHOP DRAWINGSARCHITECT REVIEWS FORWARDS TO ENGINEERGC/CM AWARDS CONTRACT AND PROVIDES CD’S TO FABRICATOREveryone is familiar with the process.Lets look at each of these parties and see what they do.ENGINEER REVIEWS RETURNS TO ARCH
8CONTRACTS & STANDARDSTHE AISC CODE OF STANDARD PRACTICE AND THE VARIOUS AIA/ASCE STANDARD CONTRACTS ALL CONTAIN PROVISIONS RELATING TO THE DEVELOPMENT AND REVIEW OF SHOP DRAWINGS
9Shop Drawings – AISC COSP 4.2 Fabricator ResponsibilityExcept as provided in Section 4.5, the fabricator shall produce Shop and Erection Drawings for the fabrication and erection of the Structural Steel and is responsible for the following:(a) The transfer of information from the Contract Documents into accurate and complete Shop and Erection Drawings; and(b) The development of accurate, detailed dimensional information to provide for fit up of the parts in the field.READ
10CHANGES – AISC COSP 4.2 Fabricator Responsibility When the Fabricator submits a request to change Connection details that are described in the Contract Documents, the Fabricator shall notify the Owner’s Designated Representatives for Design and Construction in writing in advance of the submission of the Shop and Erection Drawings…
11Approval AISC COSPExcept as provided in Section 4.5, the shop and Erection Drawings shall be submitted to the Owners Designated Representatives for Design and Construction for review and approval. …returned in 14 calendar days…
12Approval AISC COSPApproval…or…approval subject to corrections noted and similar approvals shall constitute the following:Confirmation that the Fabricator has correctly interpreted the Contract Documents…Confirmation that the (Engineer) has reviewed and approved the connection details shown on the Shop and Erection Drawings and submitted in accordance with if applicable; andRelease by the (Engineer) and (CM) to begin fabrication using the approved submittals
13AIA STD. CONTRACT- CONSTRUCTION Shop Drawings…The purpose of their submittal is to demonstrate for those portions of the work for which submittals are required the way the Contractor proposes to conform to the information given and the design concept expressed in the Contract Documents.
14GC AIA STD. CONTRACT -CONSTRUCTION The Contractor shall review, approve and submit to the Architect…submittals required …The Contractor shall perform no …Work…requiring submittals until the submittal has been approved by the Architect…By approving… Shop Drawings… the Contractor represents that the Contractor has determined and verified materials, field measurements and field construction criteria…and has checked and coordinated the information contained with such submittals with the requirements of the Work and of the Contract Documents.
15GC AIA STD CONTRACT –CONSTRUCTION (d) The Contractor shall not be relieved of responsibility for deviations from the…CD’s by the Architect’s approval of Shop Drawings…Unless the Contract has specifically informed the Architect in writing of such deviation…The Contractor shall not be relieved of responsibility for errors or omissions in the Shop Drawings…by the Architects approval.
16ACEC STD. CONTRACT for PROFESSIONAL SERVICES ENGINEER’S CONTRACTReview and approve or take other appropriate action in respect to Shop Drawings…but, only for conformance with the information given in the CD’s and compatibility with the design concept of the completed Project as a functioning whole…
17ACEC STD. CONTRACT Engineer’s Approval NOT – “will not extend to means, methods, techniques, sequences, or procedures of construction or to safety precautions and programs incident thereto.”
19ACTUAL PRACTICE & PROCEDURE / FABRICATOR The Fabricator and GC negotiate the contract. Once an arrangement is made, the Fabricator compares the bid/ pricing drawings to the final Contract Documents.Detailing is usually started right away. Then the Fabricator, Erector and GC discuss the fabrication and erection sequence.
20ACTUAL PRACTICE & PROCEDURE / FABRICATOR When questions arise or conflicts are found during the preparation of the shop drawings, questions are asked via RFI’s to determine direction.
21ACTUAL PRACTICE & PROCEDURE /FABRICATOR Multiple copies of the shop drawings are submitted to the GC. In order to help expedite the review turn-around time, a concurrent copy sometimes is sent to the EOR and/or Architect, with the GC’s permission, to help expedite the process.
22ACTUAL PRACTICE & PROCEDURE – GC The General ContractorVerifies that the Subcontractor understands the submittal requirements.Obtains a schedule for submittals from the subcontractorsReviews the submittalForwards the submittal (if acceptable) to the AE.Returns submittals back to the subcontractor after AE reviewTracks status of submittals
23ACTUAL PRACTICE & PROCEDURE – GC GC ReviewTo confirm that the system is in general conformance with the Contract Documents and the GC/ Sub-contractor agreement and to also coordinate with the other affected trades.
24ACTUAL PRACTICE & PROCEDURE – A/E The Architect sends the shop drawings on to the EOR. In practice, the Architect often performs their review simultaneous with the EOR or after the EOR and adds his comments.The EOR reviews and makes comments … keeps one set, and returns the remainder back to the Architect.
25ACTUAL PRACTICE & PROCEDURE – A/E REVIEW PRACTICEThe level of detail involved in the Engineer’s review varies greatly from firm to firm or project to project.FIRM(A) General review of member sizes, connection types and major building dimensions
26ACTUAL PRACTICE & PROCEDURE – A/E REVIEW PRACTICEFIRM(B) Detailed review of each part, verification of member size, overall length, material type, verification of each connection, weld sizes, hole sizes, hole locations verification of no paint at SC connections, primer.
27ACTUAL PRACTICE & PROCEDURE – A/E REVIEW PRACTICE -WHO REVIEWS THE SHOP DRAWINGS?The design engineer.Another similarly qualified engineer.The CA department.The most junior member of the team.
28ACTUAL PRACTICE & PROCEDURE – A/E The typical actions by the A/E are:Approved / No Exceptions TakenApproved as Noted / Exceptions as NotedRevise and ResubmitRejectedThe first two actions allow the Fabricator to proceed and fabricate the material without a re-submittal. The latter two require re-submittal.
29ACTUAL PRACTICE & PROCEDURE – A/E the Fabricator/Detailer reviews all comments, contacts the appropriate party with questions and/or RFI’s, and … completes or corrects them for fabrication.Drawings are released to the shop. Final “For Construction” copies are sent to the GC. The Erector is sometimes copied at this time.
30ACTUAL PRACTICE & PROCEDURE – A/E The “For Construction” shop drawings are sometimes not given to the field erection crew until the first delivery truck arrives at the job site.
31PROBLEMS In Preparing Shop Drawings Rocky Mountain Steel Construction AssociationStructural Engineers Association of ColoradoSteel Liaison CommitteePROBLEMS In Preparing Shop Drawings
32Incomplete Contract Documents Common concerns voiced by FabricatorsDimensions do not close.Structural components are not located in plan or in elevation.Details are not complete or specific to the project.Design Drawings and Specifications are in conflict.Structural drawings are not thoroughly coordinated withArchitectural or Mechanical drawings
33“architects drawings can not be used for construction” Inconsistent industry guidelines for production ofdrawingsFor shop drawings: AISC “Code of Standard Practice forBuildings and Bridges”, 3/18/05, 3.1.For Design Drawings: SEAC “A Guide for Consulting StructuralEngineering Services in Colorado”, 10/04, 4.G.1-4.AIA Monthly Periodic “Best Practice in Risk Management”September 2005 States:“architects drawings can not be used for construction”
34The Architect is responsible for control dimensions and elevations. Common problemareas are:Geometry in plan and elevation(2) Stair dimensions(3) Canopies and entrances(4) Edge of slab or roof deck(5) Mechanical unit sizes, weights, locations and openingsthrough the structure.
35Request For Information Often, RFI’s may result from unanswered questions.The timing of the shop drawing submittal can be delayed by this part of the process.Numerous RFI’s can be indicative of unclear or incomplete Contract Documents.Time and possibly the cost required to prepare the shop drawings will likely increase.
36Poor CommunicationsThe shop drawing submittal and review process is oftenunclearly specified. Because of this, the GC and/ or Architectdecide on a project specific process.Different EOR offices have different practices with regard to thetimeliness and completeness of their review methods.The construction schedule sometime changes and the affectedparties are not informed.The Fabricator’s schedule requirements are unknown to theother parties.The reviewers have no idea how large the submittal packageswill be.
37Shop Drawing Review Comments Can be vague, unclear, cryptic or unreadable.May not adequately address or completely answer questionsraised.May make changes outside of the scope of work, thus affectingcost and schedule.May be deferred to a downstream reviewer and thus may gounanswered.May be specifically avoided due to a concern on the part of theEOR that he will become liable for fit up when answering adimensional question.
38Coordination With Other Trades The burden of coordination responsibility is often placed on theFabricator by the GC.The Fabricator is generally not provided with neededdocuments and is not generally equipped to effectivelycoordinate with other trades.Timing of coordination can be an issue, since other trades areworking under their own schedule.The Fabricator usually does not have contractual authority overthe other trades, which dilutes obligations, incentives andcooperation.
39Suggested Solutions In Preparing Shop Drawings Rocky Mountain Steel Construction AssociationStructural Engineers Association of ColoradoSteel Liaison CommitteeSuggested Solutions In Preparing Shop Drawings
40RECOMMENDATIONS to improve the shop drawing process A. Complete Contract Documents are necessaryAISC COSPCustomized specificationsMechanical openingsEOR compensation for mechanical changesSpecify unusual loads for the joist supplierFlexibility concerning connections
41Improve Communications 1. Pre-Detailing ConferenceFace to face meetingsWho should attendCome preparedEstablish proceduresDiscussion of Fabricator issues
42Improve Communications 2. RFI’s (10/05 MSC and the AISC COSP 4.6)Ask & answer in a timely wayOnly ask about issues not addressed in CD’sAddress only one question or issueAsk a “yes” or “no” question, with a proposed sketched solutione. Answers must be clearf. Follow up phone callg. Don’t use for changes or substitutions
43Improve Communications 3. Construction ScheduleGC should provideKey Fabricator milestone dates are neededAdvise EOR of arrival date of shopsAdvance copy
44Suggestions For Improving Shop Drawing Review Comments Route one record set of shops for reviewReadable comments, addressing all questionsDo not finish design on the shop drawingsGo over comments with the DetailerReviewer should talk with affected partiesChanges should be separately documentedComments should refer Detailer to specifics in CD’s
45Coordination With Other Trades GC is responsible for coordinating the trades