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A bridge having a horizontal top cord is span between tow piers A and B having an arbitrary height. It is required that a pin-connected truss be used, consisting of steel members bolted together to steel gusset plates. The end supports are assumed to be a pin at A and a roller at B. A vertical loading of 5 kN is to be supported within the middle 3m of the span. This load can be applied in part to several joints on the top cord within this region or to a single joint at the middle of the top cord. The force of the wind and the weight of the members are to be neglected. Assume the maximum tensile force in each member cannot exceed 4.25 kN; and regardless of the length of the member, the maximum compressive force cannot exceed 3.5kN. Design the most economical truss that will support the loading. The members cost $7.50/m and the gusset plates cost $8.00 each. Submit your cost analysis for the materials, along with a scaled drawing of the truss, identifying on the drawing the tensile and compressive force in each member. Also include your calculations of the complete force analysis.
Friction of the walker's shoes and rope are sufficient to cause the rope to have more tension on one side then the other. Neglecting the weight and any elastic deformations of the 20.1-m long rope, create a table using 1.0m increment for the range
A rectangular channel of 2 m depth and 5 m width carries 1 m deep running water. It is laid to a slope of 0.001 with Manning's n = 0.02. Some distance downstream there is a hump of height 0.5 m on the stream bed.
Find an equation of a plane containing the three points (-2, 5, -3), (-7, 3, 1), (-7, 4, 3) in which the coefficient of x is -8.
Calculate carbonate, noncarbonate, and total hardness Na+ = 27.8 mg/L Cl- = 35.6 mg/L Ca+2 = 48mg/L CO3-2 = 30 mg/L Mg+2 = 12mg/L HCO3- = 61 mg/L K+ = 12 mg/L SO4-2 = 48 mg/L
a well is located in a confined aquifer. the transmissivity of the aquifer is 1200 m^2/d and the storativity is 0.0005. the flow rate is 4000 m^3/d. At a distance 75m from the well,
Water at 60 degrees Fahreneit flows at 3 cfs through a 150-ft-long duct of 6 in X 9 in cross section. The pressure at the inlet end is 15 psig, and at the outlet, 20 ft higher than the inlet, it is 4 psig.
The number of telephone call coming in the business switchboard average 4 minutes/call. Let x be the number of calls received, Poisson variable. a. What is the probability there will be at least one call in a given one minute period.
An expressway off-ramp consisting of a single lane leads directly to a tollbooth. The rate of arrival of vehicles at the expressway can be considered to be Poisson with a mean of 50 veh/h.
The inflow to a small reservoir during a storm may be described by the equations Q=1000(1-e^-kt) where Q= flow in cfs k= runoff rate = 1.0 per hour t = time in hours The outflow through the dam gates is held constant at 800 cfs.
The drinking water needs of an office are met by large water bottles. One end of a .25 in diameter plastic hose is inserted into the bottle placed on a high stand, while the other end with an on/off valve is maintained 2 ft below th bottom of the ..
develop a spreadsheet application that will display in a table the values of modulus of elasticity Ec for concrete having unit weight ranging from 95 pcf to 155 pcf (in steps of 5 pcf) and compressive strength ranging from 3500 to 7000 psi
a rectangular beam made using concrete with fc 6000 psi and steel with fy60000 psi has a width b 20 in. the concrete
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