Codes seismic requirements for building structures, non-structural components, and non-building structures Diaphragm theory, horizontal diaphragms, and shear walls per SDPWS Seismic requirements for foundations and retaining walls Details of seismic requirements for concrete, wood, steel, tilt-up construction, and masonry structures Damage and retrofit of existing structures per ATC 20, and ATC Seismic detailing, inspection, structural tests, and quality control Access Time : Course access time will be available immediately after you complete the registration and purchase for days.
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In general this is a truss and technically there is not bending moment in whole structure. But the members may get the flexure if the forces are not applied on the joints. In this case, there is uniform force on the 2 members of the truss. So each member individually will have bending moment. If all reactions of a structure passes through one point then we cannot write the equation of equilibrium and we will lose one equation.
So, this is the instable structure: Then before any actions occures in this structure the structure will fail and thus there is no bending moment in this structure. That being known answers C and D are eliminated. To determine the relative compaction we must determine the dry unit weight of the fill sample.
Then we can compare it to the maximum dry unit weight. Thus the distribution of bending moment in both direction needs reinforcement for negative and positive bending moment in both directions.
A Trained person B Site supervisor C Competent person D anyone in the site with engineering degree The Answers is A The competent person is not necessarily have sufficient knowledge about the nailing. For all excavations a trained person should be the first who enter.
An envelope starting at a point two feet below the lowest point of Public structure continuing upwards at a forty five 45 degree angle from the horizontal, up to the horizontal projection of the outside limits of the adjacent underground structure or excavation, projected at grade level. And the horizontal line shows the reference point for it. The number on stake shows the required cut below the horizontal line.
So, the final elevation will be equal to 1. How much does labor cost for this project? Most nearly, how much will it cost to reduce the project completion time by four days? Tires are an additional 21, with the estimated life time of hours. No variable material on the scaffolding will be stored. The underground water level is 2 m below the ground. There are two deposits of sandy soil at the site.
The first deposit of soil has a depth of 3 m, and a total unit weight above the water level of The second deposit of soil has a saturated unit weight of Determine the effective vertical soil pressure at point A. Another footing with the same size is on top of the soil. Which one shows more bearing capacity? A No changes in bearing stress because the area is important B Buried one has more bearing stress C Surface one has more bearing stress D It depends on the soil parameters.
The average effective vertical stress in the clay at the depth of 5. Determine the total stress at the depth of 5. A 54 B 84 C 79 D 30 11 Determine the lateral force per unit length of wall on the frictionless retaining wall, as shown in the figure below. The soil behind of the wall is clean sand with a saturated unit weight of Groundwater level is at the surface of the ground. Assume that the effective stress at point A is kPa, determine the value of H2.
Assume that the surcharge is 40kPa acting at the top of soil as shown in the diagram. If the effective pressure at point A is kPa. Determine the water content of this soil. If the maximum permissible bending stress is 24, psi. Determine the minimum section modulus for the supposed beam. The shear support from the concrete is 57 kips.
The beam cross section is 18 in by 28 in. The depth of the steel is 25 in. Determine the required spacing for the shear reinforcement at the support.
The applied dead load is 7 kips. Neglect self-weight. The column length is 12 ft tall. The column is not braced along the length. Determine the effective length of the column. Using the 1. If the Plastic section modulus is given equal to 55 in3 for the assumed section, find the maximum stress in the section. The beam made of steel with 50 KSI strength. The total height of the column is 30 ft. The length of all beams is 35 ft. Assume Fy and Fu are 50 ksi and 65 ksi respectively.
Assume there is no reduction in stiffness for inelastic buckling and connections are pinned. Assume sidesway is not prevented. Determine the effective length factor for the column top half of the column. Using the Thiessen polygon method, the portions of the watershed associated with gages A, B, and C are , , and acres, respectively. For a particular storm, it is determined that the excess rainfall for these 3 portions of the watershed is 0.
What is the volume of runoff from this watershed for this storm? Which of the following describes the culvert flow under these conditions? A Inlet control, inlet is not submerged, critical flow at the inlet B Inlet control, inlet is submerged with orifice flow control C Outlet control, inlet is submerged D Outlet control, inlet is not submerged 22 Runoff from a 3-acre site is to be drained by a channel.
The time of concentration for this site is 40 minutes. Rainfall quantities to be used for design are 0. For what discharge should this channel be designed? The diameters are given. Determine the ratio of velocities in the branches. Assume the friction factor for all the lines to be the same. The two pipes have the same friction factor f and diameter, but pipe 1 is twice as long as pipe 2.
What fraction of the discharge between the start and end points flows through pipe 1? What is the elevation of the PVT?
Size Percent Passing What is the total unit weight of the compacted soil? Determine the required average compressive strength for a plant where the standard deviation is unknown given the equations. Which point shows the yield stress? If the soil fails under a force of , lb, and the factor of safety considered as 3, find the allowable stress of soil.
A smooth drum roller will be used to compact the soil in 4-inch-thick lifts while the width is 32 ft. The water must be added to the stationing length of ft to obtain the required moisture content for compaction. How many gallons per yard must be added to meet the requirements? The slab supported by edge beam in two sides and there is no edge beam at the other sides. Swell and shrinkage factors for the soil are given equal to 0. The final volume of the compacted earth is most nearly.
A B 65 C 88 D 40 For the following picture which shows a ditch checks for erosion control, which answer is the best description of both ditches? Short Cut There is no need to calculate anything in this problem. Task 5 is the finishing task of this project and therefore, must be on the critical path. All tasks that are on critical path have always zero floats. Therefore, A is the correct answer. There is no variable material on scaffolding so only the live load of the personnel and their equipment shall be considered.
The area on each column is less than sf so no reduction of live loads shall be considered. The Answers is B According to the below picture and using any different expressions to find the ultimate bearing stress i.
So the more depth, the more bearing stress. So the footing which is embedded shows more bearing more than the on surface footing with the same size. Knowing this we will calculate required spacing using the appropriate relationships. Determine the shear that will need to be carried by the steel and the spacing to do so. This will require a resistance factor to be considered. Use the resistance factor table. For shear use 0. Look up the area for a 3 bar at the appropriate table.
The area is 0. To know which set of maximums to use calculate the limit and test against Vs. The top end of our system is fixed in translation but free in rotation, and the bottom end is fixed in both translation and rotation.
See the appropriate table which is shown above. For our system select an effective length factor of 0. Step 2: Calculate the effective length for our column. Maximum moment equations for a distributed load on a simple beam can be found in AISC table A Inlet control, inlet is not submerged, critical flow at the inlet B Inlet control, inlet is submerged with orifice flow control C Outlet control, inlet is submerged D Outlet control, inlet is not submerged The Answers is B Step 1: Since the critical depth is greater than the uniform depth, the culvert slope is steep.
Therefore the culvert is under inlet control. Step 2: Since the headwater elevation above the invert is more than 1. Step 2: In applying the rational method, rain falling over a time period equal to the time of concentration of the watershed should be used. In this case, the time of concentration is given as 40 minutes, or 0. Step 1: Determine the time interval The time frame given is in half hour increments.
Step 2: Determine the rainfall for each interval Time hr The sand fraction of the soil is those larger than No. Therefore, the coefficient of uniformity is 9. Note: It can be calculated to see that the water content of the compacted soil is higher than that of the uncompacted soil, therefore water must be added during compaction. However, this is irrelevant to the question in this problem.
Use the chart provided to calculate the required average compressive strength. All practice codes consider lower yield point as the yield stress.
Step 3: The ultimate compressive strength, , is equal to the normal stress at failure. According to the code the stiffness of beams will create the support on all sides, therefore the two way slab can be created. Panels with beams on two parallel edges is the one way slab so at no circumstances the designer cannot create the two way slab unless the designer add two beams on other edges or design the slab without beams on all edges.
So, in this question the slab is the one way slab at all conditions. The basic horizontal earth pressures shall be computed using the active earth pressure. The resultant or total active earth pressure shall be multiplied by a stiffness factor depending upon the required stiffness.
He obtained his bachelor of science degree and a doctorate from University of Leeds in England. Williams has extensive experience in teaching and practicing structural engineering, including designing and constructing bridges, schools, and industrial and commercial structures.
Williams has published several textbooks and papers on structural engineering design, structural analysis, seismic design, and reinforced and prestressed concrete design. What is Digital Marketing? Digital Marketing Strategy. What are the best Paid Blogging Sites? Best Blogging Sites. What is affiliate marketing?
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