K. S. Pruthi , P. C. Verma , Mohan Lal , B. K. Bhartari

Abstract

Extensive laboratory tests have been conducted under six series of experiments to study the effects of two species of varying density from strength groups, thickness of constituent members, inclination of loading to the direction of grain of timber and face veneer orientation of plywood, preboring plywood, etc. Analysis of results done at different levels of derivations have revealed a definite trend in applications as to the preference of a particular plywood thickness, timber thickness and strength loss on preboring plywood but no generalized conclusion have been drawn. Bearing strength of wire nails presented for different types of joints may be safely used as designfunctions in plywood-to-wood composite structures.

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K. S. Pruthi , Mohan Lal

Abstract

Nail is an economical and simple jointing device for wood in timber structure such as roof trusses, columns etc. The lateral bearing strength of 3.55 mm dia (9 SWG) nails in double shear in Terminalia alata (Sain) now redetermined through laboratory tests for parallel and perpendicular to grain loadings has heen reported in this paper based on the requirements of Indian Standard. The data will enable the engineers to design and construct safe timber stroetures more economically.

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N. K. Shukla , A. K. Khanduri , Krishan Lal , Mohan Lal

Abstract

Based on the tests conducted on small clear specimens of Acacia benthamii, Casuarina cunninghamiana, Eriobotrya joponica. Milingtonia hortensis, Prosopis juliflora and Thuja orientalis from some localities, their physical and mechanical properties have been reported and discussed. The safe working stresses for structural purposes and suitability indices for various Industrial and engineering uses have also been reported. While the avilable data on all the species is not sufficient for drawing firm conclusions about their utilisation for different end uses, it has been found that Millingtonia hortemis and Prosopis juliflora are more suitable from strength point of view, for constructional purposes, tool handles and railway sleepers. Prosopis juliflora has also been found suitable for dunnage pallets.

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N. K. Shukla , P. C. Verma , Krishan Lal , Mohan Lal , S. N. Sanyal

Abstract

Based on the tests conducted on small clear specimens of plantation grown Acacia leucophloea. A. nilolica and A. tortilis from Mohindergarh (Haryona), their physical and mechanical properties have been reported and discussed. Although all the three species are heavier than Teak, they are not superior to Teak in several mechanical properties. Based on suitability indices, these species have been grouped as very heavy and moderately steady timbers. From strength point of view, all the three species are suitable for constructional purposes, railway sleepers, tool bandies, fence posts, agricultural implements, anvil blocks, mallet heads etc. A. nilotica and A. tortilis are also suitable for the manufaCture of dunnage pallets.

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K. S. Pruthi , Mohan Lal , H. N. Mishra

Abstract

Nail jointed timber designs, besides being simpler in execution and economical in cost have potentialities in promoting the utilization of short length and small dimensioned stocks of timber. In this paper the strength properties of structural joints made with 5 mm dia, diamond pointed/plain shanked wire nails have been described for Eucalyptus sp.-a fast growing species. Statistical analysis and the reported values are of four different loading patterns simulated to web and chord connections for both the temporary and permanent conditions in timber structures.

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