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Design Challenges:

A primary challenge was the discontinuity of the upper-level wood-framed shear walls at the ground floor. The open lobby layout prevented these walls from extending directly to the foundation, creating a complex load transfer path for lateral seismic and wind forces.

The hotel’s electrical loads required precise coordination with mechanical and plumbing systems to balance capacity and avoid overloads.

Achieving energy efficiency targets demanded integrated MEP strategies to minimize consumption while maintaining guest comfort.

Consistent MEP system design across the 2nd through 5th floors, as indicated by the repetitive floor plan references, requires precise coordination to ensure uniformity and scalability.

S3DA Solutions:

Instead of relying only on costly special moment frames, our team strategically disregarded the use of shear walls in some locations on the typical floors, in some cases that cannot continue to the foundations due to lobby conditions. We also collaborated with the architect to integrate appropriately sized shear walls within the exterior window facade, allowing them to serve as part of the lateral force-resisting system and simplifying the overall structural design.

Utilized compact, high-efficiency MEP equipment to maximize space utilization, ensuring compliance with the site plan constraints outlined.

Implemented variable refrigerant flow (VRF) HVAC systems and LED lighting with occupancy sensors to meet Title 24 requirements, reducing energy consumption while maintaining guest comfort.

Collaborated with civil engineers to align MEP utility connections with the site’s infrastructure and parking analysis, to streamline water, power, and drainage systems.

Key Design Features:

The project heavily utilized BIM coordination with Revit to meticulously integrate structural elements (walls, steel columns, moment frames) with MEP systems. This was particularly critical on the second floor above the lobby, where careful planning allowed mechanical ductwork to be concealed without requiring costly steel beam penetrations or increasing the floor-to-floor height.

Incorporation of VRF HVAC systems and LED lighting to reduce energy costs and comply with Title 24 standards.

Standardized MEP designs for the 2nd through 5th floors to simplify installation and maintenance, as shown in the repetitive floor plan

Integration of building management systems (BMS) for real-time monitoring and control of HVAC, lighting, and water systems to optimize performance.

Low-flow fixtures and greywater recycling systems to reduce water usage, aligning with sustainable design goals.

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  Location: Imperial Beach, San Diego, CA

CCM Builders, a family-owned business which has been general contracting and developing real estate in the South Bay got approval to develop a z-shaped complex with hotel rooms, residential units, and a pool.

The project is welcomed by the community and is expected to contribute to the city’s goal of growing its hotel industry as well as create much-needed housing in Imperial Beach, as featured on the ABC 10News San Diego (https://www.10news.com/news/local-news/long-time-vacant-lot-could-get-hotels-apartments).

The project is called Blue Wave and consists of a 73,000-sqft four-story complex with 47 hotel rooms, 51 residential units, and an underground parking garage with 106 spaces. It also includes a two-story commercial building that adds a restaurant, shops, and an office.

S3DA was awarded the structural design and MEP design of this project, particularly because of our capabilities to handle both types of projects simultaneously. This is a unique approach which significantly reduces design clashes and offers a single source of responsibility, which leads to lower costs and adhered deadlines because of a more effective working procedure.

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Overall:

The existing building consists of a two storey building of a hotel (Ponsbourne Park, 4 The Dricve Newgate Street), approximately 600 square meters each floor.

It was all internal wall to be removed but keep the existing roof system.

The two storey hotel is intended to change into a full height single storey event hall.

Design codes and standard:

Design standard:

Design and detail of the structural steelwork was done based on BS 5950 and BS8110 and EuroCode where applicable

GENERAL STEEL SECTIONS AND PLATES ALL AREAS

Unless noted otherwise on the Engineer’s drawings, hot – rolled structural sections and plates of Grade S355 of BS EN 10025-2 are used.

Source: Obtain steel from a source accredited to a national or internationally accepted Quality standard.

Software:

Etabs and Tedds for modeling and calculation.

Client:
Gurhan Samantir

Date:
June 2019

Location:
4 The Drive Newgate Street

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