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Concrete Design for New and Existing Non-Ductile Structures

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Concrete Design for New and Existing Non-Ductile Structures

Session 1:
Strategies, Challenges & Opportunities Observed in LA Area NDC Retrofit Projects
Reihaneh Sarraf & Kyle White, MHP Structural Engineers
12 noon - 1:30 p.m. PST, Tues., Oct. 24

On Oct. 9, 2015, the City of Los Angeles passed Ordinance 183893 which included provisions for mandatory earthquake hazard reduction in existing non-ductile concrete (NDC) buildings. Since its passage, numerous jurisdictions in the greater Los Angeles area have passed or are in the process of developing similar Ordinances, including most recently the City of Torrance, and soon to be followed by Los Angeles County. Thousands of seismic evaluations and retrofit designs are underway for these vulnerable buildings. This presentation will use snapshots from completed and ongoing NDC projects that highlight strategies for evaluation and retrofit, challenges encountered during these often complex projects, and opportunities for all project stakeholders. Discussion highlights include: detailed as-built investigation, use of non-linear response history analysis, fluid viscous dampers, explicit consideration of foundation uplift, and how more active collaboration with a geotechnical consultant can improve a retrofit project.

Reihaneh Sarraf, is a Senior Project Engineer in the Long Beach office of MHP Structural Engineers. She is a licensed Structural Engineer in California and holds her Ph.D. degree focused on Earthquake and Structural Engineering from University of Nevada, Reno. With a strong background in numerical modeling and nonlinear dynamic analysis, and with her professional expertise in seismic design and evaluation of various structures, Reihaneh plays a pivotal role in supporting MHP's intricate seismic retrofit projects.

Kyle White is an Associate and Project Manager in the Long Beach office of MHP Structural Engineers. Kyle joined the MHP team in 2007 and oversees a team dedicated to seismic evaluation and retrofit projects. Kyle is a licensed Structural Engineer in California, as well as a disaster service worker volunteer through the California OES Safety Assessment Program.

Development of a Prescriptive Method for Fiber Reinforced Polymer in Retrofits
Garrett Hagen, Degenkolb Engineers

FRP has become a common seismic retrofit tool for existing concrete buildings, and with several non-ductile concrete retrofit mandates in California, its use has been accelerated in recent years. However, there is little guidance available for seismic retrofit in structural engineering education, engineering guidelines, or prescriptive standards, and specific guidance around the use of FRP in conjunction with ASCE 41 and/or ASCE 7 seismic demands is severely lacking. As a consequence, there are a variety of approaches to the engineering art of FRP retrofit, and there is heightened risk of non-uniform seismic performance. This presentation will discuss design criteria and building code developments around FRP seismic retrofit as well as highlight recent experimental testing that will be incorporated into such prescriptive guidance.

Garrett Hagen, SE is a recognized expert in hazard mitigation. He is passionate about contributing positive improvements to the build environment with a focus on identifying cost-effective upgrades to existing building. Drive to finding value- add opportunities for every project.

Session 2:
ACI 318-19 Revisions (Re-approved 2022)
Hossain Ghaffari, John A. Martin & Associates
12 noon - 1:30 p.m. PST, Tues., Oct. 31

This session covers the revised ACI 318-19 sections compared to ACI 318-14. These sections are by no means comprehensive but selected based on the code content that are mostly used in reinforced concrete structures design. Some of the slides shows the code content and some references the code section due to extensive revisions that cannot be fully covered due to time limitation.

Hossain Ghaffari is a senior project manager at John A. Martin & Associates (JAMA), a structural engineering firm in Los Angeles, and adjunct professor of Civil Engineering at California State University Northridge and Cal Poly Pomona University. I graduated with a PhD degree from University of Kansas in 1991. I started my career as an assistant professor of Civil Engineering at Sharif University of Technology in Iran before joining JAMA in 1998. My experience is mainly in analysis and design of steel and concrete structures, construction administration, and seismic evaluation of structures using ASCE 41 Code.

Session 3:
San Francisco and Los Angeles Non-Ductile Concrete Ordinance
Daniel Zepeda, Degenkolb Engineers
Joe Maffei, Maffei Structure & Ayse Hortascu, Applied Technology Council
12 noon - 1:30 p.m. PST, Tues., Nov. 14

Southern California cities have been hard at work implementing Non-Ductile Concrete Ordinances with the intent to reduce their seismic Risk. Daniel will be providing an overview of all the different concrete ordinances that have been implemented in Southern California including their technical criteria and key administrative requirements. Daniel will also provide some background on how these ordinances where developed and approved by various jurisdictions.

Daniel Zepeda, received his Master's degree in Structural Engineering from the University of California, Berkeley and is a licensed Structural Engineer in California and a Principal with Degenkolb Engineers. With 20 years of experience in seismic evaluation and seismic strengthening of existing buildings, Daniel's project breadth spans large medical centers, civic buildings, and privately owned structures. He is the co-chair of the SEAOSC EBC and past chair of SEAOC EBC. He also serves in the SEAOSC board. Daniel is currently helping multiple cities in the Los Angeles area in developing their seismic ordinance programs. He also participated in the update of the latest version of ASCE 41. Daniel has also been part of multiple post-earthquake reconnaissance trips which includes him leading the 2017 SEAOSC team that visited Mexico City after their devastating earthquake.

In 2020, the Office of Resilience and Capital Planning (ORCP) of the City and County of San Francisco contracted with the Applied Technology Council to complete selected tasks from the City's 30-year Earthquake Safety Implementation Plan (ESIP), including the development of technical program materials for seismic retrofit of older concrete buildings. The work is based on information contributed by SEAONC Existing Buildings Committee, EERI Concrete Coalition, as well as technical standards and guidance documents prepared by ASCE and FEMA. The development work also benefited from input from a stakeholder working group convened by ORCP and ordinances enacted in other jurisdictions.

This presentation will provide an overview of the ordinance development process and the technical program materials prepared by the ATC Project Technical Committee, under the leadership of Joe and Ayse.

Ayse Hortascu is Director of Projects at the Applied Technology Council, a non-profit structural engineering organization headquartered in the San Francisco Bay Area. She has 20 years of experience in the field of structural engineering with a primary focus on earthquake engineering, as well as blast-resistant design. At ATC, she is responsible for project management, oversight, and quality control on the development of ATC products and publications. Her project management work involves managing the work of numerous consultants and organizing workshops on various technical issues ranging from selection and scaling of ground motions for seismic hazard analysis to the rapid visual screening of buildings for potential seismic hazards, as well as developing technical guidance to support policy decisions by local and national governments, resulting in over 50 publications to date. She is serving as the Project Manager for the ATC-151 project with the City and County of San Francisco. She also managed the development of the City’s Tall Buildings Strategy under the ATC-119 project. She is a Director for the Earthquake Engineering Research Institute (EERI) and has served in a similar role for the Northern California chapter of EERI and the Structural Engineers Association of Northern California (SEAONC). She is the founder of Women in Structural Engineering (WiSE) and a founding member of the Structural Engineering Equity, and Engagement (SE3) Committee.

Joe Maffei is the founder of Maffei Structural Engineering, a San Francisco-based firm focused on innovative design, advanced structural analysis, and expert review. Joe is a practicing structural engineer with experience in the seismic evaluation, design, and retrofitting of structures for public and private-sector clients. Over his 35-year career, he has directed a range of projects, including designs using ground-breaking solutions and advanced methods of evaluation. Joe has helped lead the structural engineering profession in developing standards for performance-based design, nonlinear analysis, high-rise design, seismic retrofitting, and solar-energy structures. He has contributed to building codes and structural guidelines for the American Society of Civil Engineers (ASCE), the American Concrete Institute (ACI), and other organizations. He is the Technical Director for the Applied Technology Council’s project to develop a seismic retrofit ordinance for San Francisco’s concrete buildings. Joe has a BE in Civil Engineer from Cooper Union, an MS in Structural Engineering from the University of Texas at Austin, and a Ph.D. in Structural Engineering from the University of Canterbury, Christchurch, New Zealand. He was a post-doctoral scholar at the Toyohashi Institute of Technology in Japan. He is the recipient of a Fulbright fellowship to New Zealand, and is a fellow of the Structural Engineers Association of California.