FPInnovations carried out a survey with consultants and researchers on the use of analytical models and software packages related to the analysis and design of mass timber buildings. The responses confirmed that a lack of suitable models and related information for material properties of timber connections, in particular under combination of various types of loads and fire, was creating an impediment to the design and construction of this type of buildings. Furthermore, there is currently a lack of computer models for use in performance-based design for wood buildings, in particular, seismic and fire performance-based design.
In this study, a sophisticated constitutive model for wood-based composite material under stress and temperature was developed. This constitutive model was programmed into a user-subroutine and can be added to most general-purpose finite element software. The developed model was used to model the structural performance of a laminated veneer lumber (LVL) beam and a glulam bolted connection under force and/or fire. Compared with the test results, it shows that the developed model was capable of simulating the mechanical behaviour of LVL beam and glulam connection under load and/or fire with fairly good correlation.
With this model, it will allow structural designers to obtain the load-displacement curve of timber connections under force, fire or combination of the two. With this, key design parameters such as capacity, stiffness, displacement and ductility, which are required for seismic or fire design, can be obtained.
It is recommended that further verification and calibration of the model be conducted on various types of wood products, such as CLT, glulam, SCL and NLT, and fasteners, e.g. screw and rivet. Moreover, a database of the thermal and structural properties of the wood members and fasteners that are commonly used in timber constructions need to be developed to support and facilitate the application of the model.
Alberta Agriculture and Forestry asked FPInnovations to evaluate the patented Trident Pump System developed by Younkers Wielding for the system's suitability for wildfire operations. This report summarizes the author's observations and thoughts.
In May 2017 FPInnovations conducted an initial field assessment of a helicopter on-board system for mixing water-enhancing gel concentrate at Fort Vermillion. For this study, Alberta Agriculture and Forestry contracted a Bell 214B helicopter with on-board gel mixing capability. The helicopter company chose Firewall II gel and an Isolair external tank to meet the contract requirements.
This Info Note presents FPInnovations’ observations of the ability of the on-board mixing system to effectively mix Firewall II gel with water.
Innovation in hotspot target equipment used for Infrared (IR) testing reduces risks and logistical challenges. This InfoNote describes the development of a new hotspot prototype for use at the IR grid in Hinton, Alberta.
The objective of the current project is to develop a performance-based design process for wood-based design systems that would meet the objectives and functional statements set forth in the National Building Code of Canada.
More specifically, this report discusses the fire and seismic performance of buildings, as identified as a priority in a previous FPInnovations report.
In late June and early July of 2015, many large fires burned in Saskatchewan (Figure 1). Two of these fires threatened pre-existing community protection fuel treatments established to protect their villages. This report documents the treatments completed and the influence that the treatments had on fire behaviour as fire moved into them. The two communities that had their fuel treatments challenged were the hamlets of Weyakwin and Wadin Bay. Weyakwin had built a fuelbreak on the east side of town and thinned 4.6 ha of forest on the west side of the fuelbreak. Wadin Bay had also completed a thinning project to protect the hamlet from fire moving in from the west and south. Two trips were made to observe and document the fuel treatments and how fire behaved within them. Stand density data was collected within and beside the treatments to describe the fuel environment. Other data sources included fuel treatment plans, fire weather data, fire chronology information and personal communication with those who were involved in the projects and firefighting efforts.
WoodST is capable of calculating heat transfer, charring rate, load-displacement curve as well as the time and mode of failure of timber structures exposed to fire, thus providing a cost-competitive solution for the fire safety analysis of timber structures. This InfoNote briefly introduces the development and verification of WoodST. Two applications of WoodST are also demonstrated.
WoodST est capable de calculer le transfert de chaleur, la vitesse de carbonisation, la courbe charge-déplacement ainsi que le moment et le mode de défaillance des structures en bois exposées au feu, offrant ainsi une solution à coût compétitif pour l'analyse de la sécurité incendie des ossatures en bois. La présente note d’information présente brièvement le développement et la vérification de WoodST. Deux applications de WoodST sont également présentées.