Journal of Architectural Engineering

The Golden Gate Bridge is an iconic landmark, which has long held the distinction of being the most popular structure in the world to commit suicide. A general process is presented for policy makers’ use to generate conversation and clarify their values in making decisions about public works improvements. This applies particularly well where issues of aesthetics and cost are emotionally and politically charged. The Golden Gate Bridge serves as a case study of how this process can be used. Three design solutions were generated on the basis of architectural concerns and developed in the context of evaluation criteria. A value-based decision analysis approach was taken to determine the preference structure of decision makers involved and to provide a rational framework for further development. Results indicate that existing preferences among decision makers may not be consistent with their public decisions and could be clarified given a more rigorous framework. The do-nothing option is likely to be less preferred to other options given a thorough definition of the acceptance criteria.

The nave of Santa Maria Novella, a Dominican church in Florence Italy is representative of a Florentine Gothic system of construction. This system, consisting of domical rib vaults on square nave bays, high side aisles, and crypto-buttressing, differs substantially from the French high Gothic system of even-level-crown rib vaults on rectangular bays, with flying buttresses over relatively low aisles. An investigation into the structural aspects of the Florentine Gothic construction system reveals that the domical vaults increase the longitudinal thrust and reduce the transverse thrust, which may require additional precautions to be taken during construction, but entails a less elaborate buttressing system. The domical vaults are found to perform well structurally, with an absence of tensile stresses, and are more suitable for a square bay. In general, the structural system of the nave of Santa Maria Novella is found to be the product of carefully considered structural design, which may be accepted as an alternative to the French Gothic construction system.

Low-slope roofs are subjected to potentially high levels of suction pressure as reported by Baskaran and Savage in 2003 in “Wind pressure measurements on full scale flat roofs.” Traditional roof assemblies are prone to failure when the low pressure on the roof surface instigates a transfer of forces to the roof membrane. Existing pressure-equalized roof systems use the power of the wind to transmit low pressure to the space immediately beneath the roof membrane, pulling the membrane down to the roof surface. The object of this study is the design of a wind vent which, when coupled with a single-ply roof membrane in a complete roof assembly, will successfully equalize low pressure throughout the entire field of the roof. The proposed wind vent differs from existing equalizer valves in its use of the Bernoulli effect to create low pressure. The vent is omnidirectional and contains no moving parts. Future study will be required to determine the tributary area of each vent and other roof system parameters.

A series of 11 tests of full-scale partition walls were conducted to determine the behavior of nonstructural gypsum wallboard partition walls during lateral deformation as might be expected during a major earthquake. The partition walls were constructed as double-sided, $1∕2\mathrm{in}$ . $\left(13\mathrm{mm}\right)$ gypsum wallboard partition walls with wood stud framing. The walls deformed laterally in one of two ways: either as a joint-failure mode with racking of the individual gypsum wallboard panels, or by a pier-rotation mode where all the gypsum wallboard panels in a pier rotated as a unit. In all of the tests, the fasteners failed by pulling through the back of the wallboard panel, cutting of the gypsum, or tearing out through the edge of a wallboard panel. In some tests, the strength of the tape and compound was seen to provide adequate support to cause the walls to roll as a single unit, especially when the spacing of fasteners was large. The maximum load resisted varied from $512\mathrm{N}∕\mathrm{m}$ $(378\mathrm{lb}∕\mathrm{ft})$ to $\mathrm{1,177}\mathrm{N}∕\mathrm{m}$ $(869\mathrm{lb}∕\mathrm{ft})$ and occurred at drifts between 0.68 and 1.87%. The drift when specific damage thresholds occurred was monitored during testing. Damage initiated with slight cracking of the panels at the wall opening at drifts of 0.25%, followed by increasing damage up to drifts of 2%, and minimal additional damage at drifts above 2%. Damage thresholds for cyclic loading often occurred at lower drifts than comparable specimens under monotonic loading.

Structural assessment of in-place wood floors is currently limited to inspection of individual members. This is costly and laborious. Consequently, the continued use or adaptive reuse of old/historic buildings is often in jeopardy because of the lack of an efficient and economical assessment method. A systems approach of assessment is the subject of this research. Floors in four old buildings and several laboratory-built floors were tested. The floor’s bending stiffness was determined by static bending tests and its fundamental natural frequency was determined by transverse forced vibration. A model for one way beam action with simple support is the best predictor of floor responses. A technique for using this research to predict stiffness of existing floors is suggested.

This paper uses the quantitative decision-making technique, the analytical hierarchy process, to derive prioritized scales for (1) the constructability factors; and (2) the relative contribution of common construction systems in a building superstructure comprising structural frames, slabs, envelopes, roof, and internal walls toward constructability. The identified constructability factors show that to enhance constructability design requirements should be easily visualized and coordinated by site staff, while designs should allow economic use of contractors’ resources and enable contractors to develop and adopt alternative construction details. The precast method is rated as the most constructible construction method, indicating its better performance in facilitating efficient and safe construction in the busy urban environment in Hong Kong. However, the methodology adopted in this study should be of international interest, especially for those desirous of improving constructability of designs with different contextual backgrounds.

Evaluating the overall performance of buildings has emerged as a trend in building engineering in recent years. Several programs that evaluate building performance have been developed or are being developed in different regions of the world. The building envelope performance assessment tool was initiated at Concordia University based on the feedback received from manufacturers. After briefly introducing the development of the tool, this paper presents an integrated framework which applies information technology and the international standard Industry Foundation Classes (IFC) to ensure that the building envelope satisfies energy requirements as well as other requirements such as moisture and thermal performance, concurrently. The framework is designed to extract geometric and material layers’ data of a house from computer-aided design (CAD) drawings in IFC data model, link to performance evaluation applications, such as HOT2000 and MOIST3.0, and compare evaluation results with a set of criteria. To demonstrate the functionalities of this framework, a prototype system has been developed including a preprocessor that imports the building model from an IFC-compatible CAD application, an application integrator, and a postprocessor. Finally, a case study, which aims to validate this prototype system, is discussed in detail.

Damages from hurricanes and various windstorm events represent a loss of several billions of dollars in the United States. A loss of $30 billion was attributed to Hurricane Andrew alone in Florida in 1993. In 2004 and 2005, Florida, Louisiana, Mississippi, and other locations in the southeast United States and the Caribbean saw an unprecedented wave of major hurricanes causing great destruction and property damage. This paper discusses the topic of home design for high winds and hurricanes, and sums up a recently completed practical research on this subject.