Q3- Three concrete beams were selected for flexural strength test. Results from tests areshown in table below. If the flexural strength of the concrete is 1505 KPa, determine theload needed for failure in each test using four points loading. Show the detailedcalculations and loading system sketches.S.NWidth, mmDepth, mmSpan, mm(Width +18 (Depth +0.5x18 (Span +181149.2148.4471143.3146.84663137.6137.1450

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23- Three concrete beams were selected for flexural strength test. Results from tests are hown in table below. If the flexural strength of the concrete is 1505 KPa, determine the pad needed for failure in each test using four points loading. Show the detailed alculations and loading system sketches. S.N Width, mm Depth, mm Span, mm (Width +18 (Depth +0.5x18 (Span +18 149.2 148.4 471 143.3 146.8 466 3 137.6 137.1 450

23- Three concrete beams were selected for flexural strength test. Results from tests are hown in table below. If the flexural strength of the concrete is 1505 KPa, determine the pad needed for failure in each test using four points loading. Show the detailed alculations and loading system sketches. S.N Width, mm Depth, mm Span, mm (Width +18 (Depth +0.5x18 (Span +18 149.2 148.4 471 143.3 146.8 466 3 137.6 137.1 450

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q3- Three concrete beams were selected for flexural strength test. Results from tests are shown in table below. If the flexural strength of the concrete is 1505 KPa, determine the load needed for failure in each test using four points loading. Show the detailed calculations and loading system sketches. S.N Width, mm Depth, mm Span, mm (Width +N) (Depth +0.5xN) (Span +N) 1 149.2 148.4 471 2 143.3 146.8 466 3 137.6 137.1 450
Give full explanation Awall form 14 ft high is filled with 160 lb per cu ft concrete at a tem perature of 70°F. The concrete is Type I without a retarder. Concrete will be placed with normal internal vibration to a depth of less than 4 ft. The rate of placement is 5 ft per hr. From Table 1, the value of Cw is 1.1 and from Table 2 the value of Cc is 1.0. The rate of placement is less than 7 ft per hr and the place ment height does not exceed 14 ft so calculate the lateral pressure by using appropriate formula.
The design engineer specifies a concrete strength of 37.92 MPa. Determine the required average compressive strength for: a. a new plant where s is unknown b. a plant where s = 3.45 MPa for 22 test results c. a plant with extensive history of producing concrete with s = 2.76 MPa d. a plant with extensive history of producing concrete with s = 4.14 Mpa
Q3- Three concrete beams were selected for flexural strength test. Results from tests are shown in table below. If the flexural strength of the concrete is 1505 KPa, determine the load needed for failure in each test using four points loading. Show the detailed calculations and loading system sketches. S.N Width, mm Depth, mm Span, mm (Width +16) (Depth +0.5x16) (Span +16) 149.2 148.4 471 143.3 146.8 466 137.6 137.1 450
The design engineer specifies a concrete strength of 31.0 MPa (4500 psi). Determine the required average compressive strength for:a. a new plant for which s is unknownb. a plant for which s = 3.6 MPa (520 psi) for 17 test resultsc. a plant with extensive history of producing concrete with s = 2.4 MPa (350 psi)d. a plant with extensive history of producing concrete with s = 3.8 MPa (550 psi)
The design engineer specifies a concrete strength of 5500 psi. Determine the required average compressive strength for a. a new plant where s is unknown b. a plant where s 7.1 500 psi for 22 test results Questions and Problems 309 c. a plant with extensive history of producing concrete with s = d. a plant with extensive history of producing concrete with s 400 psi 600 psi
A normal-weight plain concrete beam is 6 in. x 12 in. is simply supported on a span of 4 ft and is subjected to a midspan concentrated load of 4500 lb. Assume f’c = 3,000 psi, and concrete unit weight is 150 lb/cf. Calculate the maximum concrete tensile stress using both methods, and compare it with the value for modulus of rupture (fr) using the ACIrecommended value based on f’c.
Transformed Area Method (Concrete Cracked - Elastic Stresses Stage) Problem 2) Modified Problem 2.13 (page 55, McCormac and Brown, 10th Ed.) Change f'c to 5 ksi and cross-sectional properties See figures below. 30 kip W = 2 kip/ft A 10 ft. 20 ft. 30 ft. f'. = 5000 psi 30 in. 36 in. 8 #9 bars 3 in. 3 in. 16 in. (a) Find the reactions at A and B. RA = kip, RB = kip ft*kip (b) Determine the maximum applied moment. Mmax = (c) Calculate the cracking moment of the beam and verify that the beam has cracked under the applied loads. Mer = ft*kip in3 Moment of inertia of gross section, Ig = Modulus of Rupture f, = (d) Calculate the cracked moment of inertia. Note that you will need to first calculate the concrete psi modulus of elasticity and modular ratio. Do not use the textbook modular ratio of n=8. Ec = psi (use the simplified equation for normal weight concrete) Modular ratio, n =
3. Per the following, are the breaks acceptable if the concrete is 4000 psi? ints 4110 Set 1 4050 4150 Set 2 4200 3810 Set 3 3750
A flexure strength tests were performed on a concrete beam having a cross section of 0.15x0.15m and a span of 0.45m. If the total load at failure was 37.5kN, calculate the ff:a. The flexure strength of the concrete if center-point was applied.b. The flexure strength of the concrete if third-point was applied.c. Which of the two flexural tests is recommended in determining the flexure strength of the concrete and why?
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