Asce 7-10 Chapter 13 Pdf
Eliz Cisneroz
ASCE 7-16 contains significant changes from ASCE 7-10 in the areas of seismic design, wind design, snow design, and more. A brand new chapter on design against tsunami loads has been added. Several of the seismic chapters have been extensively rewritten. Since ASCE 7 eventually becomes law through adoption by the International Building Code (IBC) and then through adoption of the IBC by legal building codes of local jurisdictions, a practicing engineer has no choice but to keep up with these changes. The changes are also of interest to the code enforcement community, academics, advanced-level students, and others.
This seminar discusses all significant changes between the 2010 and the 2016 editions of the ASCE 7 standard, following a chapter-by-chapter sequence. Each change is explained, the background to it is given to the extent practicable, and its impact is also discussed, when that can be assessed. The emphasis is on what a practicing engineer needs to implement the changes in their design, with confidence and full understanding.
ASCE 7-16 is scheduled to be released in early January 2017. Barring unforeseen circumstances, it will be the referenced standard for design loads and seismic design provisions in the 2018 IBC. ASCE 7-16 will thus acquire the force of law within a city, county, or state whenever that legal entity adopts the 2018 IBC as the basis of its building code. Thus practicing engineers and code enforcement personnel have no choice but to keep up with changes in the ASCE 7 standard.
Practicing structural engineers, code enforcement personnel in building departments, structural engineers in government agencies, university faculty in structural engineering, and advanced-level university students studying structural engineering.
Have you ever been at home during an earthquake and the lights turned off due to a loss of power? Imagine what it would be like to be in a hospital on an operating table during an earthquake or for a ceiling to fall on you while you are lying on your hospital bed.
One of the last things you want is to experience serious electrical, mechanical or plumbing failures during or after a seismic event. During the 1994 Northridge earthquake, 80%-90% of the damage to buildings was to nonstructural components. Ten key hospitals in the area were temporarily inoperable primarily because of water damage, broken glass, dangling light fixtures or lack of emergency power.
ASCE 7 has an entire chapter titled Seismic Design Requirement of Nonstructural Components (Chapter 13 of ASCE 7-10) that is devoted to provisions on seismic bracing of nonstructural components. Unfortunately, not a lot of Designers are aware of this part of the ASCE. This blog post will walk Designers through the ASCE 7 requirements.
Nonstructural components consist of architectural, mechanical, electrical and plumbing utilities. Chapter 13 of ASCE 7-10 establishes the minimum design criteria for nonstructural components permanently attached to structures. First, we need to introduce some of the terminology that is used in Chapter 13 of ASCE 7.
Architectural components consist of furniture, interior partition walls, ceilings, lights, fans, exterior cladding, exterior walls, etc. This list may seem minor compared to structural components, but if these components are not properly secured, they can fall and hurt the occupants or prevent them from escaping a building during a seismic event. The risk of fire also increases during an earthquake, further endangering the occupants.
Section 13.5 of ASCE 7-10 includes the necessary requirements for seismic bracing of architectural components. Table 13.5-1 provides various architectural components and the seismic coefficients required to determine the force level the attachments and supports are to be designed for.
Mechanical and electrical components consist of floor-mounted and suspended equipment. It also includes suspended distributed utilities such as ducts, pipes or conduits. These components are essential in providing the necessary functions of a building. In a hospital, these components are required to be fully functioning both during and after a seismic event. A disruption of these components can make an entire hospital building unusable. In order for hospitals to properly service the needs of the public after a seismic event, fully functioning equipment is essential.
Section 13.6 of ASCE 7-10 provides the requirements of seismic bracing for mechanical and electrical components. Table 13.6-1 provides a list of typical components and the coefficients required to determine the force level the attachments and supports are to be designed for.
These systems may not seem important in the structural systems of a building, but they are essential in allowing the building to function the way it was designed to serve the public. It is also important that occupants are able to escape a damaged building after a seismic event. Obstacles such as bookcases blocking exit doors or falling debris may prevent occupants from leaving a building after a seismic event.
Mr. Welti, in most cases, the specialty contractor is responsible for hiring a design professional to design all supports and attachment of the components (anchor bolts, seismic bracing, seismic certification of equipment, etc). In smaller jobs, the Structural Engineer of Record is typically hired to provide the necessary design services for the supports and attachments. As a design professional, Engineers of Record should bring up the issue of designing the attachment and supports for all the components specified in Chapter 13 of ASCE 7-10. A question should be raised on who will be providing this service. Unfortunately, I have seen jobs where attachments and supports were not installed or properly designed because the contractor or the Designer were not aware of the requirements in Chapter 13. As Structural Engineers, we have to educate our building owners, contractors and even building officials of this requirement. ASCE 7-10 Chapter 13 section 13.2.1 subsection 1 states that all designs of attachments and supports for components should be submitted to the authority having jurisdiction for approval after review and acceptance by a registered design profession. Unfortunately this section does not get enforced too often .
Mr. Kirkham, you are correct. The EOR has a duty to list all the deferred submittal in their General Requirements and Notes. I have found most contractors submit these drawings and calculations to the MEP design professionals and it stops there. It does not go further to the building officials to check and enforce. When I have done presentations in the past at some notable building departments, I have had some interesting questions that shows me that most of these requirements are not fully enforced, some of them even think it is a new requirement in the code. I think it is the duty of the engineers to educate people about the contents of the code. It would be a good start if Engineers start putting these requirements on their General Notes. It is important to understand that even boxed stores such as Target and Walmart has these systems that require seismic bracing or anchorage designs for their systems that has an important factor of 1.5. Thank you for commenting and reading the post. I hope to do more on this topic in the future.
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