Review Category : Articles

Brick Masonry Façades and the Structural Engineer

Structural engineers typically have had little involvement with the design of brick masonry veneers other than the selection of lintels, shelf angles, and the attachment of these supports to the structure where warranted. In most cases, this is because brick masonry veneers are generally detailed prescriptively, which does not require engineering design. However, modern designs demanding high-performance enclosures and unique façade profiles increasingly require a structural engineer’s involvement for the design to conform to code requirements while achieving the intended effect.

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The National Council of Structural Engineers Associations (NCSEA) is pleased to present the 2019 NCSEA Structural Engineering Curriculum Survey results. The survey is a triennial review of the recommended NCSEA Structural Engineering Curriculum at over 175 civil or architectural engineering schools throughout the country that offer educational opportunities for students desiring to become structural engineers. For nearly 10 years, NCSEA has promoted the recommended NCSEA Structural Engineering Curriculum as the core subject matter deemed necessary by the profession for a sound educational background in structural engineering. The recommended curriculum consists of the following twelve courses:

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The Central Vermont Railroad was chartered on October 21, 1843, to run from Burlington on Lake Champlain to Windsor on the Connecticut River via St. Albans and Montpelier, the state Capital. It was opened to traffic at various times in 1849. It crossed the White River, a tributary of the Connecticut River about four miles north of White River Junction between Woodstock and West Hartford. A major high bridge was built across the river consisting of four spans of 140 feet and a short span of 70 feet, with a total length of approximately 630 feet on a large skew to the river. It was a 26-foot-deep, single track, double Towne lattice deck bridge, made of plank and strengthened by heavy timber arches with the piers and abutments built of granite. It was covered on the sides and top to protect the trussing from the weather. Its top was also covered with iron plates to minimize the chance of fire. From the track to the surface of the ice (water) was 42 feet, with the bottom of the trusses 16 feet from the river’s surface. The bridge was considered by many to be a fine example of bridge design and construction.

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Preventing Damage Caused by Ground Loss and Water Loss

Deep excavation projects in highly urbanized and built-up environments must be designed and constructed with additional care. The design of these projects needs to deal with lateral wall movement, ground settlement, ground loss, and subsurface water pressure changes, all of which can lead to damage to adjacent structures (Figure 1). Damage can be in the form of cracks on non-structural walls (appearance), jammed windows and doors or dysfunctional services (functionality), and, in severe cases, cause structural members to be distressed (safety). Work suspension limits, usually for building settlement and inclinometers, may be breached. The project team could potentially face delays, claims, and additional costs due to expensive rectification work.

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The historic inner dome and the interior supporting walls of the West Virginia State Capitol Building were found to have structural deficiencies. Using 3-D finite element analysis modeling and laboratory testing to determine material properties for the unique coconut fiber reinforced plaster elements, repairs were designed to strengthen portions of the existing building and incorporate supplemental supports to preserve the integrity of this important structure. Additionally, it was necessary to support the dome in-place while the walls beneath the dome were removed entirely and rebuilt.

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For the first time in nearly a year, my firm recently hosted an in-person employee gathering. It was a social event involving masks and social distancing. Everyone was quite happy and maybe a little relieved to be together again. I had the opportunity to talk at length with two recent hires, Shery and Jon. I had met Shery once, at her interview just before closing our physical office last March, and only knew Jon through his remote interview and videoconferences. Both were thrilled to meet their co-workers in person, and they shared their excitement at the prospect of one day soon joining them in an office environment. They were equally anxious to ask a nearby teammate the basic questions every new hire has. My experience at this company outing was the strongest confirmation possible that it was not a question of whether we should ever return to the office, but when and to what extent.

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Early-age cracking of concrete bridge decks, typically caused by drying, autogenous, and thermal shrinkage effects, can have detrimental effects on long-term behavior and durability. Darwin and Browning (2008) recently reported that “by controlling early-age cracking, the amount of cracking at later ages should remain low.” They also reported that early-age cracking could significantly increase the rate and amount of chloride penetration (from deicing salts), which may accelerate the corrosion rate of embedded reinforcing steel.

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Concrete slabs-on-ground are a prolific part of modern construction. Virtually every project, ranging from small single-family residences to monstrous manufacturing facilities, resort hotels, and everything in between, utilizes a concrete slab-on-ground in some fashion. Not surprisingly, therefore, is the prevalence of these slabs in construction disputes, construction defect allegations, and construction litigation. Unfortunately, the prevalence also creates complacency among design professionals. At times, concrete slabs-on-ground receive little more design attention than the inclusion of boiler-plate general notes and a “standard detail” or two, hastily inserted into construction drawings. In some cases, the notes and details have been a part of a firm’s standards for decades with no updates to account for current technologies, changes in construction methods, or industry standards.

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