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- Determine the following if it is true or false The wood grains on bending test is subjected to tension alone Wood knots do not affect the strength of wood Metal furnace by-product like slags are used as alternative aggregatesDiscusse Fibre Reinforced Concrete (FRC) used in Costal marine constructionDiscusse Reinforced Cement Concrete (RCC) used in Costal marine construction
- Laminated wood is sometimes used in the construction of highly stressed aircraftcomponents. This wood can be identified by its A. parallel grain construction. B. similarity to standard plywood construction. C. perpendicular grain construction.How can the water reducer be used to achieve each of the following functions?a. improve strengthb. improve workabilityc. improve economyThe wood column is ixed at its base and free at its top. Determine the load P that can be applied to the edge of the column without causing the column to fail either by buckling or by yielding. Ew = 12 GPa, sY = 55 MPa.
- Fill in the blanks with appropriate words a) Fibers are not ……………………… Therefore heat is only necessary for consolidation ofthe resin.b) ……………………….. is the reduction in the dimensions caused by thermal contraction ofthe polymerc)................................. is applied to the the surface of mold for easy removal of the partInlude fbdA 100 mm * 100 mm wood lumber was subjected to bending with a span of 1.5 m until failure by applying a load in the middle of its span. The load and the deflection in the middle of the span were recorded as shown in Table P10.21. a. Using a computer spreadsheet program, plot the load–deflection relationship. b. Plot the proportional limit on the graph. c. Calculate the modulus of rupture (flexure strength).
- Untreated wood can deteriorate when four conditions required for decay andinsects occur. States these four conditions.The loads which include the weight of the structural material and the stored products are called : a. ash loads b. dead loads c. live loads d. wind loadsTwo steel plates, each 4 in. wide and 0.25 in. thick, reinforce a wood beam that is 3 in. wide and 8 in. deep. The steel plates are attached to the vertical sides of the wood in a position such that the composite shape is symmetric about the z-axis, as shown in the figure. Determine the maximum bending stress produced in both the wood and the steel if a bending moment of Mz = +50 kip-in is applied about the z-axis. Assume Ewood = 2000 ksi and Esteel = 30000 ksi.