Scour profiles downstream of wood structures in vegetated channels

2020 ◽  
pp. 1645-1652
Author(s):  
S. Pagliara ◽  
M. Palermo ◽  
D. Roy
Keyword(s):  
Wood Structures ◽  
Vegetated Channels

scholarly journals Comparison of reliability evaluation methods between China and Canada standards for wood structures featuring duration of load

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Qiongyao Wu ◽  
Shuang Niu ◽  
Enchun Zhu
Keyword(s):  
Reliability Analysis ◽  
Analysis Method ◽  
Safety Level ◽  
Wood Structures ◽  
Load Effect ◽  
Key Factor ◽  
Live Loads ◽  
High Level ◽  
Partial Factor ◽  
Duration Of Load

Abstract Duration of load (DOL) is a key factor in design of wood structures, which makes the reliability analysis of wood structures more complicated. The importance of DOL is widely recognized, yet the methods and models through which it is incorporated into design codes vary substantially by country/region. Few investigations of the effect of different model assumptions of DOL and other random variables on the results of reliability analysis of wood structures can be found. In this paper, comparisons are made on the reliability analysis methods that underlie the China and the Canada standards for design of wood structures. Main characteristics of these two methods, especially the way how DOL is treated are investigated. Reliability analysis was carried out with the two methods employing the same set of material properties and load parameters. The resulted relationships between reliability index β and resistance partial factor γR* (the β–γR* curves) for four load combinations are compared to study the safety level indicated by the two methods. The comparison shows that the damage accumulation model (Foschi–Yao model) in the Canada analysis method is highly dependent on the type and duration of load, resulting in more conservative design than the China analysis method in loading cases dominated by dead load, but less conservative design in cases of high level of live loads. The characteristics of the load effect term of the performance function are also found to make considerable difference in reliability levels between the two methods. This study aims to provide references for researchers and standard developers in the field of wood structures.

scholarly journals EXPERIMENTAL TESTS ON THE IMPROVED NAGESHI-COLUMN JOINT IN TRADITIONAL WOOD STRUCTURES

2013 ◽  
Vol 19 (42) ◽  
pp. 531-536 ◽  
Author(s):  
Takeshi KAWACHI ◽  
Osamu SADAHIRO ◽  
Makoto KIMURA ◽  
Kazuo KONDOH
Keyword(s):  
Experimental Tests ◽  
Wood Structures ◽  
Column Joint

Damping sources in wood structures

1971 ◽  
Vol 19 (4) ◽  
pp. 411-419 ◽  
Author(s):  
C.-T. Yeh ◽  
B.J. Hartz ◽  
C.B. Brown
Keyword(s):  
Wood Structures

Cooperation Pullout Test of Double Self-Tapping Screws in Wood Structures

2011 ◽  
Vol 374-377 ◽  
pp. 2520-2524 ◽  
Author(s):  
Gang Shi ◽  
Jian Xing Zhang ◽  
Yuan Qing Wang ◽  
Hui Juan Huang ◽  
Zheng Hong Zhang
Keyword(s):  
Experimental Study ◽  
Pullout Test ◽  
The Self ◽  
Connection Strength ◽  
Wood Structure ◽  
Wood Structures ◽  
Pullout Resistance ◽  
Loading Tests ◽  
The Common ◽  
Strength And Stiffness

In this paper, the experimental study on the self-tapping screw’s pullout resistance in the wood structure was conducted. Domestic ordinary screws were used together with imported or domestic wood to fabricate 6 screw connection specimens in wooden walls. Then monotonic loading tests were conducted and it can be concluded that, the common round screw connection strength mainly depends on the failure mode, the lack of cooperation effect significantly influences the strength of screw connections, and the dispersion of screw connection stiffness is high. So, to obtain formulae for the self-tapping screw connection strength and stiffness by further experimental study will be very necessary.

scholarly journals Protection as a Mean to Increase the Sustainability of Wood Structures

2012 ◽  
Vol 69 (2) ◽  
Author(s):  
Calin CORDUBAN ◽  
Giovanna BOCHICCHIO ◽  
Andrea POLASTRI ◽  
Ario CECCOTTI
Keyword(s):  
Fire Protection ◽  
Building Material ◽  
Building Materials ◽  
Sustainability Assessment ◽  
Financial Loss ◽  
Wood Structures ◽  
Fire Propagation ◽  
Wide Range ◽  
Timber Constructions ◽  
Materials Used

Timber has been rediscovered as the building material of choice in recent years, especially in industrialised countries, with the shift of focus on attitudes towards sustainability that include use of natural resources and reduction of CO 2 emissions in manufacturing building materials. The environmental qualities of wood (energy-efficiency, healphy building material, ability to be recycled) are matched by few materials used in constructions nowadays, makeing it suitable for a wide range of applications. The combustibility of wood is limiting its use in construction, an important weakness in terms of sustainability, as health and cost issues constitute essential conditions in sustainability assessment methods. Arguably, fire safety constitutes the foremost precondition in choosing wood as the building material. In the case of fire, wood burns on the surface, releases energy and contributes to the fire propagation and spread of smoke. In order to insure greater safety for timber constructions, both passive and active measures of fire protection can be implemented, with the main objectives of improving the security of occupants, limitations of financial loss, protection of the environment in the case of fire. Despite the fear of using wood, the material has a better behavior in terms of fire than assumed, and even with structures more susceptible at fire risks, such as platform framing, measures can be taken in order to improve safety, as further explained in the article. The article analyses the concept of sustainability and the extent to which timber constructions observe these criteria, focusing on the means of increasing safety by fire protection methods with respect to the environment.

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