April 30, 2019

MHP’S SEISMIC EVALUATION & SEISMIC RETROFIT PROJECT EXPERIENCE

MHP Structural Engineers serves as a strategic risk management partner to a diverse client base including real estate owners, institutional investors, lenders, government entities and property condition assessment firms. With over 45 years in business, we have developed particular expertise in all areas of seismic risk from due diligence acquisition studies to applying the most complex analysis methodologies and structural materials to retrofit buildings. MHP’s hundreds of successful projects provide the framework to control costs and minimize impact to tenants in fully occupied spaces. From evaluations and retrofits of buildings affected by mandatory seismic ordinances to lender-driven reporting and voluntary building strengthening, the projects below include some of MHP’s active work.

LOS ANGELES/LONG BEACH, CA

Westchester Medical Plaza, Los Angeles, CA

  • 12-story, 90,000-SF Medical Office Building
  • Building Type: Non-Ductile Concrete
  • The voluntary seismic retrofit is currently under design and utilizes viscous dampers to absorb energy and carbon fiber (FRP) collector and diaphragm strengthening elements.

West Los Angeles, CA

  • 20-story, 250,000-SF Office Building
  • Building Type: Concrete Frame
  • MHP is completing complex non-linear time-history analysis of the building to determine if the building complies with the City of Santa Monica ordinance.

Ventura Boulevard, Los Angeles, CA

  • 14-story, 240,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • MHP is developing a schematic strengthening design for the non-ductile concrete building. Retrofit concepts may include new steel external braced-frames, viscous dampers, and/or carbon fiber (FRP) wrapping of frame elements to increase ductility.

West Los Angeles, CA

  • 5-story, 200,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • The seismic retrofit is currently under design and utilizes viscous dampers at the lower floors to absorb energy and reduce forces and drifts at the upper levels.

CSULB Peterson Hall (PH2), Long Beach, CA

  • 3-story, 80,000 -SF Classroom/Science Building
  • Building Type: Non-Ductile Concrete
  • A complete renovation, addition, and seismic strengthening of the building was completed in early 2019. A full seismic retrofit of the “Priority 2” building to CSU standards was accomplished, including shotcrete wall strengthening and carbon fiber (FRP) wrapping of columns to increase ductility.

BEVERLY HILLS, CA

Beverly Hills City Hall

  • 9-story, 70,000-SF
  • Building Type: Non-Ductile Concrete
  • MHP is in the initial stages of evaluation and design development. Retrofit concepts include new steel plate shear walls and FRP diaphragm strengthening where the tower transitions to the larger base structure.

Wilshire Boulevard, Beverly Hills, CA

  • 10-story, 180,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • Retrofit of the building was recently completed and utilized viscous dampers to absorb energy and reduce forces and drifts to the upper levels.

Wilshire Boulevard, Beverly Hills, CA

  • 9-story, 175,000-SF Office Building
  • Building Type: Steel Braced Frame & Steel Moment Frame
  • MHP’s seismic evaluation of the steel-framed tower indicates the steel moment-resisting frames (SMRFs) are compliant with retrofit criteria, but that steel braced frames require limited retrofit.

Wilshire Boulevard, Beverly Hills, CA

  • 12-story, 150,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • The Voluntary seismic retrofit is currently under construction, and utilizes viscous dampers to absorb energy and carbon fiber (FRP) collector and diaphragm strengthening elements.

SANTA MONICA, CA

Wilshire Boulevard, Santa Monica, CA

  • 12-story, 240,000-SF Office Building
  • Building Type: Steel Moment-Resisting Frame (SMRF)
  • MHP’s detailed modeling and analysis demonstrated compliance of the Pre-Northridge connections with the City of Santa Monica Ordinance requirements, and the building was recently removed from the list of potentially vulnerable buildings.

Ocean Avenue, Santa Monica

  • 7-story Multi-Family Residential
  • Building Type: Non-Ductile Concrete
  • Three-dimensional linear dynamic modeling of the building to determine if the structure complies with the City of Santa Monica ordinance.

Montana Avenue Retail, Santa Monica, CA

  • 2-story Office and Retail with integral parking
  • Building Type: Steel Moment-Resisting Frame (SMRF)
  • MHP’s modeling indicates the Pre-Northridge connections do not fully comply with the City of Santa Monica Ordinance requirements, and limited strengthening will be required.

Santa Monica, CA

  • 5-story, 100,000-SF Office Building
  • Building Type: Steel Moment-Resisting Frame (SMRF)
  • Three-dimensional modeling has been completed showing compliance of the Pre-Northridge connections with the City of Santa Monica mandatory ordinance requirements. The design team is awaiting City response.

SAN FRANCISCO, CA

San Francisco, CA

  • 6-story, 700,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • MHP is engaged as a consultant for the seismic retrofit of the non-ductile concrete building, which will be retrofit with concrete shear walls and steel braced frames.

Downtown San Francisco, CA

  • 20-story, 400,000-SF Office Building
  • Building Type: Steel Moment Frame
  • MHP has completed independent seismic analysis to determine if the building’s Pre-Northridge connections would comply with a potential future City of San Francisco mandatory strengthening ordinance.

Downtown San Francisco, CA

  • 6-story, 150,000-SF Office Building
  • Building Type: Non-Ductile Concrete
  • MHP has completed independent seismic analysis to determine if the non-ductile concrete building would comply with a potential future City of San Francisco mandatory strengthening ordinance.

As demonstrated by the projects above, MHP’s seismic expertise includes:

  • Mandatory ordinance compliance evaluations and retrofits (Los Angeles, Santa Monica, West Hollywood, Beverly Hills, etc.)
  • Voluntary seismic retrofits
  • Lender-required seismic evaluations (PML, SEL and SUL reports)
  • Performance-based analysis methodologies, including non-linear methods
  • Retrofit technology including viscous dampers, FRP, steel-plate shear walls
  • Effective seismic retrofit design of fully occupied buildings

Please contact us for more information about our capabilities.