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11.7 A retaining wall of 6 m height having a smooth back retains a backfill made up of two strata shown in Fig. Prob. 11.7. Construct the active earth pressure diagram and find the magnitude and point of application of the resultant thrust. Assume the backfill above WT remains dry Cinder H, = 2 m G, = 2.5, n = 0.7 Q = 35° Sand H2 = 4 m G = 2.6, n = 0.3 o = 30° 2 m Figure Prob. 11.7
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Report CancelAsk a a) Calculate the total active thrust on a vertical wall 5 m high retaining sand of unit weight 17 kN / (m ^ 3) for which phi = 35 deg The surface is horizontal and the water table is below the bottom of the wall. (b) Determine the thrust on the wall if the water table rises to a level 2 m below the surface of the sand. The saturated unit weight of the sand is 20kN / (m ^ 3) and you will be sure to find an answer!
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Report CancelAsk a question and you will be Econometrics deals with the measurement of variable relationships which are stochastic or random. The simplest form of variable relationships between two variables X and Y can be represented by: Y; = a + BX; +U ; where a & B are regression parameters and U, = the stochastic disturbance term What are the reasons for the insertion of U-term in the model? to find an answer!
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Report Canceln Fig. P-2.11 which depicts two three-phase circuits on a steel tower there is symmetry about both the horizontal and vertical centre lines. Let each three-phase circuit be transposed by replacing a by b and then by c, so that the reactances of the three-phases are equal and the GMD method of reactance calculations can be used. Each circuit remains on its own side of the tower. Let the self GMD of a single conductor be 1 cm. Conductors a and a’ and other corresponding phase conductors are connected in parallel. Find the reactance per phase of the system.
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Report CancelAsk a question and you will be sure to find an answer!
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Report CancelIn Fig. P-2.11 which depicts two three-phase circuits on a steel tower there is symmetry about both the horizontal and vertical centre lines. Let each three-phase circuit be transposed by replacing a by b and then by c, so that the reactances of the three-phases are equal and the GMD method of reactance calculations can be used. Each circuit remains on its own side of the tower. Let the self GMD of a single conductor be 1 cm. Conductors a and a’ and other corresponding phase conductors are connected in parallel. Find the reactance per phase of the system.
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Report Cancel6.Suppose that a researcher estimates a consumptions function and obtains the following results: where The number in parenthesis is t _value; C=Consumption, Yd=disposable income, and numbers in the parenthesis are the ‘t-ratios’ a.Test the significant of Yd statistically using t-ratios b.Determine the estimated standard deviations of the parameter estimates 7.State the assumption of OLS model 8.Given the model: with usual OLS assumptions. Show the expression for the error variance.
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Report Cancel3.The following data refers to the price of a good ‘P’ and the quantity of the good supplied, ‘S’. P 2 7 5 1 4 8 2 8 S 15 41 32 9 28 43 17 40 a.Estimate the linear regression line b.Estimate the standard errors of 4.The following results have been obtained from a simple of 11 observations on the values of sales (Y) of a firm and the corresponding prices (X). i)Estimate the regression line of sale on price and interpret the results ii)What is the part of the variation in sales which is not explained by the regression line? iii)Estimate the price elasticity of sales. 5.A sample of 20 observation corresponding to the regression model gave the following data. a. Estimate b. Calculate the variance of our estimates c. Estimate the conditional mean of Y corresponding to a value of X fixed at X=10.
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Report CancelA simply supported beam with 5m span is subjected to 45 KN/m design load. The beam is 250mm wide and 450mm deep. The material used for the design are C25/30 and $400. If the cover to reinforcement and the diameter of main bar are 30mm and 16mm respectively, determine the necessary shear reinforcement. The beam is supported by 300 by 300mm column.
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Report CancelThe bracket carrying a load is 12mm thick and is welded. Allowable weld shear stress = 145 MPa. Weld thickness 9.5 mm. 1. If P=180kN acts at the centroid of the weld group, calculate the force per unit length (N/mm) on the weld. 2. Find the polar moment of inertia of the weld group. 3. What is the maximum eccentric load P (kN) on the weld group in the figure, considering the shear of the welds.
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