- BUILDING STRUCTURES, BUILDINGS AND FACILITIES
- On Updating Design Standards of Wooden Structures
(in order of discussion) - UDC 624.011.1:539.32(083.75)
Dmitriy K. ARLENINOV, e-mail: dkarleninov@mail.ru
Moscow State University of Civil Engineering (National Research University), Yaroslavskoe shosse, 26, Moscow 129337, Russian Federation
Abstract. The release of SP 64.13330.2011 "SNiP II-25080. Wooden Structures" has caused ambiguous reaction of specialists including teachers of higher educational institutions supervising the course and graduate design. The low quality of the Code of rules has led to the attempt of its adjustment in the form of release of SP 64.13330.2017, therefore a large number of amendments, generally editorial character, has been made. Unfortunately, some issues concerning calculation stated in Construction Norms and Regulations (SNiP) II-25-80 have been unsuccessfully replaced when updating the Code of rules in 2011 and in the course of adjustment in 2017 were left without changes The authors of the article consider that the main mistake in SP 64.13330.2017 was the fact that various values of modules of wood elasticity along fibers for calculation according to the deformed scheme and for calculation on stability left differing among themselves almost twice. This has created disharmony when calculating the strength of bent and compressed bars. Besides, in this case it was necessary to change formulas for determination of the coefficients used for stability calculation of a flat form of deformation of compressed-bent elements. The fact of correction of a formula for calculation of tensile-bent elements, brought in SP 64.13330.2017, has led to decrease in reliability of wooden designs by elimination of the margin of safety connected with defects of wood in the stretched zone. At the same time, excessive reserves of strength, by introduction of coefficients of reliability of service life which for a number of reasons were not included in due time into SNiP II-25-80, are offered.
Key words: long module of elasticity of wood, wooden structures, deformed scheme, stability, reserve of strength. - REFERENCES
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