The cross section for a 50-ft-span, rectangular, prestressed beam is shown in the figure. The beamhas no mild reinforcing steel.Design Code:PCI: PCI Design Handbook: Precast and Prestressed Concrete, 7th edition, 2010.Design data for prestressing strands:Low relaxation - 1/2-in. diameterfpu = 270 ksiA = 0.153 in ² per strandStress at release = 175 ksi per strand (after initial losses)If the top fiber stress at the midspan of the beam due to the beam self-weight is 0.65 ksi, the totaltop fiber stress (ksi) at release at midspan is most nearly:Note: Take Tension as negative; Compression as PositiveCENTERLINESOF STRANDS2 in.3 in.18 in.36 in.

Answered: Image /qna-images/answer/b958beaa-0893-4fb7-a318-4be1d3b17ada.jpg

The cross section for a 50-ft-span, rectangular, prestressed beam is shown in the figure. The beam has no mild reinforcing steel. Design Code: PCI: PCI Design Handbook: Precast and Prestressed Concrete, 7th edition, 2010. Design data for prestressing strands: Low relaxation - 1/2-in. diameter fpu = 270 ksi As = 0.153 in ² per strand Stress at release 175 ksi per strand (after initial losses) If the top fiber stress at the midspan of the beam due to the beam self-weight is 0.65 ksi, the total top fiber stress (ksi) at release at midspan is most nearly:

The cross section for a 50-ft-span, rectangular, prestressed beam is shown in the figure. The beam has no mild reinforcing steel. Design Code: PCI: PCI Design Handbook: Precast and Prestressed Concrete, 7th edition, 2010. Design data for prestressing strands: Low relaxation - 1/2-in. diameter fpu = 270 ksi As = 0.153 in ² per strand Stress at release 175 ksi per strand (after initial losses) If the top fiber stress at the midspan of the beam due to the beam self-weight is 0.65 ksi, the total top fiber stress (ksi) at release at midspan is most nearly:

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

See similar textbooks

Similar questions

GG-36 IGG-36 AY G00x/00 600x/00 ( COLUMN ( COLUMN COL LC L1 L2 0.75 LC OR 0.25 L1 (GREATER GOVERNS) 0.25 L2 OR 0.25 LI SPLICE ZONE FOR (GREATER GOVERNS) GIRDER TOP BARS 0.25 L1 OR 0.75 LC 0.25 L2 0.25 L1 OR 0.25 L2 (GREATER GOVERNS) SPLICE LENGTH SEE TABLE A2 SPLICE LENGTH SEE TABLE EQ. EQ. TOP BARS AT SUPPORT EQ. EQ. CONTINUOUS WEB BARS -TOP BARS AT CANTILEVER'S DISCONTINUOUS END TOP BARS AT SUPPORT TOP BARS AT MIDSPAN TOP BARS AT MIDSPAN EQ. EQ. EQ. ED NO SPLICE SHALL BE ALLOWED 2d FROM THE FACE OF THE SUPPORT 2d Вотом BARS AT SUPPORT BOTTOM BARS AT MIDSPAN Воттом ВARS AT MIDSPAN 2d NO SPLICE SHALL BE ALLOWED 20 FROM THE FACE OF THE SUPPORT 0.165 L1 ВОТОМ ВARS AT CANTILEVER'S DISCONTINUOUS END ВОTTOМ BARS AT SUPPORT 50mm MAX. AT SUPPORT 0.165 L2 HOOP REINFORCEMENT SEE SCHEDULE HOOP REINFORCEMENT SEE SCHEDULE HOOP REINFORCEMENT SEE SCHEDULE DISCONTINUOUS FREE END CONTINUOUS END "A" OR "B" (SEE REMARKS) CONTINUOUS END "A" OR "B" (SEE REMARKS) DISCONTINUOUS END A1 Omm TYP. GG-131…
Question 2A composite bar is made up of a steel strip 2 mm thick and 12 mm wide, sandwichedbetween two aluminium strips each 3 mm thick and 12 mm wide. The three strips areheld together by two rivets of 5 mm diameter each.2.1 Make a neat detailed sketch of the assembly.2.2 If the three strips are fastened together at 15 0C, determine the shear stress set up inthe rivets when the temperature is raised to 21 0C.Note: The resistance of a rivet in double shear may be taken as 1.75 times the resistancein single shear.(For steel: E = 200 GPa and α = 11×10 -6/ 0C)(For aluminium: E = 70 GPa and α = 22×10-6/0C)
A 6m-simply supported beam cross-section is show in the figure below is prestressed with 15 wires of 5mm diameter at the bottom and 3 wires at the top. Assuming prestress in steel is 840 MPa and the density of concrete is 24kN/cu.m. Calculate the stress at bottom extreme fiber at midspan. (MPa) 250 mm- 25 mm 350 mm 65 mm
Referenced concrete When designing the same bim Why is the load in the case of moment greater than the load in the case of shear?
Q: Describe the effects of C3S on the properties of concrete. Subject; Concrete Technology Department: BE-Civil Engineering
* The Dn value for a low relaxation steel is ______. * Determine the elastic shortening loss of a pretensioned concrete, in percentage (simply supported L=15m, H=900mm, B=300mm) given that, fpi=1100MPa, f'ci=40MPa, Eps=200GPa, and the total area of the straight profile tendons is 140 sq.mm.
Assuming the concrete is uncracked, compute the flexure stresses in the extreme fibers of the beam as shown in the figure for a bending moment of 34 kN-m. The concrete has an f' of 27.60 MPa; determine also the cracking moment of the section. (Use 0.62 1 = 0.70 in calculating the modulus of rupture). Dimensions are in millimeter. 380 455 3 #9 bars (A, = 3.00 in.2) 75 300
slump test compressive strength
Derive an expression for loss due to friction in Prestresed concrete.
| Choose the most appropriate answer for the following: 3. Which one of the following is not categorized as a long-term loss of pre-stress in a pre-stressed concrete member? Loss due to elastic shortening b. Loss due to creep c. Loss due to shrinkage а. d. Loss due to relaxation of steel 4. One of the following is not correct for pre-stressed concrete: a. Reducing cracks in the concrete b. High strength of concrete and steel c. Costy d. Suitable for long span and those carrying heavy loads. 5. Cross ties are used if the distance between a bar and the corner bar is greater than... 100 inches b. 100 cm c. 150 inches d. 150 mm а.
You are to evaluate the feasibility of a cencrete infill in a hollow structural steel section subjected only to pure berding Specifically, you are tasked to determine if there will be an increase in the bending mament capacity from a hollow structural square steel section with the following dimensions shown to a concrele filled steel tube 6 mm 100 mm Material Properties: Yield stress af Steet fy, steel - 420MPa Etaul = 200G Pa Maximum compressive strength of Concrete: fe = 27M Pa Eurede = 4700VT.(e und Eanerate in MPa Under elastic stress analysis, the stress distribution within the concrete filed steel tube is as follows, NA o, - EE, Steel Stress Concrete below the NA Is not considered for analysis Concrete Stress Distribution Distribution This stress distribution is for the untransformed cross section. Moreover, since concrele carry little to na tensile stresses, the portion of the concrete below the neutral axis which resist tensile stresses will nat be considered in the anahlysis…
Determine the y-bar centroid of the composite figure shown. Where: y = 18mm and x = 9 mmShow your solution and round off if possible