Posts tagged with "Concrete":
• Date of Retrofit: 2018 projected, (original construction 1965) • Architects: Hopkins Architects (Design Architect); Bruner/Cott (Executive Architect) • Consultants: Arup Partners (mep, structural engineering); Faithful & Gould (cost consultant); Simpson Gumpertz & Heger (structural engineering); Michael Van Valkenburgh Associates (landscape architect) • Project Scope: Renovation of former Holyoke Center will include much-needed modernization of the building; improved access to Harvard’s information center; enhanced landscaped plazas at north and south ends of the site; new, flexible interior spaces for events; and common spaces to attract varied constituencies within the university. • Clear window film: 3M, Solyx • Installers: A+A Window, American Window FilmRecently renamed the Smith Campus Center, Sert’s former Holyoke Center at Harvard University is an h-shaped 10-story building offering a panoramic view of the nearby Charles River. With a crumbling exterior concrete envelope and inefficient heating and cooling system, the building is undergoing a significant renovation process spearheaded by London-based Hopkins Architects and executive architects Bruner/Cott.
Two quotations might aptly describe Sert’s dogmatic approach to campus planning and architecture, which often was in conflict with popular taste. The first, from Sert himself, proclaiming his disdain for Harvard Square’s historical colonial architecture that he partially demolished for his Holyoke Center: “Stepping into Harvard Square is like entering one of Dante’s circles of hell in terms of anything associated with human enjoyment, pleasure, or beauty.” A year after its completion, Harvard’s student journal shot back with: “The one nice feature about Holyoke Center is that it’s the one place in Cambridge from which you can’t see Holyoke Center.”
Today, the building—recently renamed the Smith Campus Center—is undergoing a major physical and cultural transformation that seeks to strengthen the Harvard community, rather than to divide it. The university has engaged the university student and faculty body through 25 focus groups to produce a collective vision for the new center. The committee organizing the reprogramming of the building has received over 6,000 survey responses.
While Boston University’s Law Tower received an addition that blended old with new, blurring the lines between Sert’s building and new construction, the Smith Center’s addition will separate itself from Sert’s architecture—a move that seems intentional. Visualizations of the addition promise relaxed spaces full of nature: A natural wood-clad ceiling and light-filled glassy expanses offering glimpses to nearby renovated leafy plazas.
It is ironic that here in the very building Sert used to set forth a modernist agenda erasing the past, a new addition and campaign by the university is on track to culturally erase his project—from the facade system down to the name of the building. “The new Smith Campus Center will embody the aspirations and values that we hold dear and seek to preserve. It will draw us together more closely, strengthening the sense of community at Harvard by encouraging spontaneous interactions among students, faculty, and staff, as well as members of the broader community,” said Harvard President Drew Faust.
“We realize if we’re going to save these buildings and have another 50 years of usable life, we really have to make them better than they ever were to begin with. Because as good as they might have been in the beginning of 1960, they’re much better now than they ever were in terms of occupant comfort and ease of movement.”
[Note: Retrofitting Brutalism appears online in three articles, each highlighting a different project. To read the series introduction and explore the first project, the Boston University Law Tower, visit here. This second article features the Peabody Terrace; the third piece focuses on the Holyoke Center.]
• Date of Retrofit: 1995, window replacement 2004 (original construction 1962) • Architect: Bruner/Cott • Project Scope: concrete envelope repairs, replacement window system, building system upgrades • Structural Engineer: Foley and Buhl Engineering, Inc., Watertown, MA • Mechanical Engineer: Zade Associates, Boston, MA • CM: Shawmut Design & Construction, Boston, MA • Windows: Custom Window, Plymouth, MA
Josep Lluís Sert’s career was born in Barcelona where, after briefly working for Le Corbusier in Paris, he went on to found numerous influential artist groups influential in the growth of modern architecture. He was exiled to New York City during WWII where he worked on several urban planning schemes for cities in South America. From this experience, he became dean of Harvard’s Graduate School of Design, initiating the world’s first urban design degree program.
One of his trademarks, prominently found on the facade of Peabody Terrace, are wonderfully colored panels integrated into window systems. “They’re very romantic,” said Cott. “…and surprisingly brightly colored. You can open them up and let in fresh air.” The problem was that these panels were literally the only means to temperature control in the building. All of the dwelling units, despite various solar orientations, ran off one thermostat. Tenants had no control of their heat, often using Sert’s operable panels to cool their overheating spaces in the winter months. The units were neither air tight or waterproof, further adding to the deterioration of the building.
“That was the extent to the sophistication of what I would call the most innovative housing project designed in the past 100 years,” said Cott. “It was the work of a genius, the way he [Sert] aggregated apartment units around stair cores and skip stop elevators […] an incredibly beautiful exterior without any regard to occupant comfort.”
Bruner/Cott approached the project in the 1990s as a preservation exercise, reconstructing the 500 interior units, repairing the concrete envelope, and designing an extensive replacement of Sert’s window system. Moss said that owners will typically just cover up the issues in these types of aged buildings. “That kind of recladding approach is going to become more and more endemic, but for good modern buildings it is a real problem. Often it skips the step of understanding and then working sympathetically with the original architecture.”
[Note: Retrofitting Brutalism appears online in three articles, each highlighting a different project. You can find our second installment, the Peabody Terrace, here. The third installment on the Holyoke Center appears here.]
Stationed between Harvard University and MIT in Cambridge, Massachusetts, Bruner/Cott finds itself at arguably the epicenter of Brutalism—the Charles River where reinforced concrete towers thrived in the 1960s due to postwar campus expansion programs and the desire for an effect of stability and permanence among institutions. Bruner/Cott’s pioneering work with adaptive reuse in the 70s, along with extensive experience in managing the preservation of entire campuses of buildings—some nearly entire towns—has naturally led the firm to Boston University and Harvard University , where the architects find themselves reengaging the work of their former colleagues and teachers.
Technical complexities of renovating Brutalism bring forth a new set of preservation issues not seen in the restoration of 19th century clapboard buildings and limestone buildings—namely the cultural and tectonic baggage of exposed concrete. People often dislike concrete buildings. And concrete-formed structures are prone to sprawling and cracking since they are often reinforced and formed incorrectly. There is an art to concrete restoration that not only involves labor-intensive selective demolition, but also a precise pairing of aggregates to minimize the difference between old and new exposed finishes. “This is very fascinating work on a level that is very different than renovating a 19th century Victorian church. Modern architecture is of my time. We were around when modern architecture was new and innovative, and now we are renovating it. Its very interesting to see its faults and to be able to bring it back so it can continue for many years—hopefully many decades,” said Cott.
The following projects have much in common despite a range of nearly 20 years between completion dates. Their stories all stem from what Cott describes as a “downward spiral” of disinvestment—a familiar story that goes something like this: The building is not particularly liked by the public leading to a decline in its use, which triggers owners to stop taking care of it because of costly repairs. The building deteriorates, and its occupants hate it even more. Now demolition is on the table as a solution. The first question from these owners is often, “If we clear out the building, can we demolish it?” All of this effort is ironic for an architectural movement that made every aesthetic, formal, and structural attempt at erasure of a tumultuous past that included the Great Depression and two world wars. But Bruner/Cott sees its work as a respectful blend of preservation and correction of modernism’s faults, and “do the impossible” by making these buildings better than they ever were to begin with.
Boston University Law Tower
• Date of Retrofit: 2015 (original construction 1965) • Architect: Bruner/Cott • Project Scope: New Redstone building; total gut renovation of Tower and Pappas Library; facade restoration. • Consultants: Weidlinger Associates (structural); BR+A (mep/fp); Richard Burck Associates (landscape design); Colburn & Guyette (foodservice design); Acentech (acoustic, av); Atelier Ten (lighting); Haley & Aldrich (geotech); Nitsch Engineering (civil); Faithful & Gould (cost estimating) • Windows: Graham Architectural Windows • Facade Installer: Sunrise Erectors
The project began with Bruner/Cott compiling a report that paired preservation principles with a development-minded approach. This became the blueprint for renovations to Sert’s Boston University Law Tower. Bruner/Cott’s message to BU’s administrators was simple and direct: “You are the stewards of an incredibly important piece of modern architecture.” In total, the architects added 100,000 square feet to Sert’s composition, which Cott said was already a generally well-defined and complete scheme. “The owners were smart enough to ask the question, ‘Can these buildings be saved?’ which is music to any architect’s ears.”
Bruner/Cott’s comprehensive renovations to the 265-foot-tall tower included building system upgrades that required the insertion of new vertical distribution chases through Sert’s concrete slabs, and a chilled-beam, passive cooling system. Building envelope repairs included the patching of more than 630 separate areas of concrete through a labor-intensive process involving sawing and chipping away at the structure to get behind reinforcement bars. New patches of concrete were carefully color matched to the existing concrete through a process of specifying matching aggregates to Sert’s original mix. The patched areas were bush hammered to match the existing finish. Cott said this method of renovation is invasive not only to the building, but its occupants: “If the owner thinks they can’t afford to move people out of the building, then all of that noise and vibration is something for the occupants to complain about.”
One of the major flaws of this building was the circulation system of the building, which relied on elevators to transport large crowds of students to elevated lecture halls in the tower. During classes, it would take 20 to 30 minutes to clear the room, which was disruptive to the academic schedule. Bruner/Cott reprogrammed the building, swapping in administration and faculty offices for the large occupancy areas, which have relocated to a new five-story 93,000-square-foot addition between the base of the tower and an adjacent library. “We made every effort to make the new construction part of the aesthetics of the original tower,” said Cott. “When you’re inside, you know the building has been renovated, but you don’t really know what is renovated and what is original.” The architects worked to maintain the historic character of the building intact through exposed, board-formed concrete finishes.
Aggregate knowledge: Scientists at MIT discover how concrete behaves on a molecular level, could spur material advances
High performance and cultural relevance meet in concrete, metal, and steel mesh envelope.For the stakeholders involved in building the new Rev. Avery C. Alexander Academic Research Hospital (also known as University Medical Center, or UMC) in downtown New Orleans, the project was about much more than replacing facilities damaged during Hurricane Katrina. "The grander story is the effort to rebuild New Orleans," recalled NBBJ principal Jose Sama. "There was a lot of emotional attachment to the original hospital, Charity Hospital, and also—rightly so—the pride the community has for the character of the city. Everyone wanted to make sure the project was going to be something that was of New Orleans." In a joint venture with Blitch Knevel Architects, NBBJ rose to the challenge with a design that subtly reflects the city's cultural heritage. The building envelope, a combination of precast concrete, metal panels, high performance glazing, and stainless steel mesh, contributed significantly to both the project's aesthetic aspirations and its performance goals. The overarching concept for UMC, explained Sama, was to "create a performance in place." For the architects, "performance" holds a double meaning. "Performance is embedded in [New Orleans] culture, but this is a more high-level sense of performance," said Sama. "Place," in turn, draws on the city's climate and character. "We looked at various clues in the urban environment and how those could affect the design," said Sama, recalling visits to the hospital's Canal Street neighborhood and the French Quarter. Then, of course, there are the environmental threats made all too clear by the Katrina experience. "We completed [the design] with the understanding that we had to create an envelope that could withstand hurricane-force winds and missile impact," said Sama. "That was an important piece of selecting the glass and the curtain wall system." In fact, most of the damage sustained by Charity Hospital was the result of flooding rather than high winds. As a result, the architects faced a mandate to elevate all critical hospital functions above 22 feet. "We envisioned this as a floating hospital," said Sama. "The notion was that the more public zones, the softer spaces like dining, registration, and the lobbies, would occur at the ground level. Then you move up to an elevated plane of critical services. That way they could function regardless of flooding." The building envelope reflects this programmatic move: The first floor of the central campus structure—the diagnostic and treatment center—is wrapped in a transparent curtain wall with a strong emphasis on the horizontal while the upper, critical floors feature a precast concrete facade. The two other project components, the medical office building and the inpatient towers, offer variations on the theme. The former is clad in an insulated metal panel system, the latter in precast concrete, glass, and stainless steel mesh. A number of subtle gestures connect the hospital exterior to New Orleans' history and culture. One thing Sama noticed on his site visits was that "the notion of the garden is important, and the notion of getting outdoors." With that in mind, the architects created a central entry pavilion "designed such that you have a very pronounced sense of entry created by a porch, or a projecting eave—it almost has the effect of a trellis," said Sama. They also created informal gardens wherever possible. The signature garden, nestled between the towers and the diagnostic center, is water-based, and imagines the seating areas as lily pads floating on a pond. "The idea that here in the middle of New Orleans you find a water-intensive garden was really critical," said Sama. The patient towers, too, embody a strong connection to the outdoors via balconies for patients and staff. Metal scrims in Cambridge Architectural's Mid-Balance architectural mesh simultaneously provide aesthetic interest and fall protection. "We studied what we could do with the scrim," said Sama. "We think we picked just the right scale. It's appropriate for someone sitting on the balcony, but also for someone walking by." The mesh panels produce a "soft veil effect," he observed. "In the morning light, it glistens. The intent was to create a memory of Mardi Gras beads, in terms of color and glistening. People will pick up on that different times of day." Cambridge Architectural contributed to several other elements of the project. Mesh fins in the Scale pattern are attached with a custom cable tensioning system to the upper levels of the patient towers, to provide solar shading. On the parking garage portion, designed by Blitz Knevel Architects, 86 panels of Scale mesh again add both visual impact and fall protection without compromising ventilation. On the south elevation of the garage leading to the UMC helipad, a custom-built shade mesh fin system cuts solar gain and glare. Many of the references embedded in the new UMC hospital—the way in which the towers' orientations recall traditional New Orleans shotgun houses, or the connection between the stainless steel mesh and Mardi Gras beads—are so understated as to operate on almost a subliminal level. But like the city itself, the building comes alive at night, finally, and literally, revealing its true colors. "The building from the outside is very neutral," explained Sama. But thanks to accent colors on the inpatient tower stairs, revealed through translucent glass, plus accent lighting on the bulkheads above, after dark the towers shine, he explained. "The whole point was that at night they would glow with color from within."