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Advanced Reinforced Concrete

by: Savanna Cruickshank

Advanced Reinforced Concrete CE 547

Marketplace > University of Idaho > Civil Engineering > CE 547 > Advanced Reinforced Concrete
Savanna Cruickshank
GPA 3.54


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Class Notes
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This 6 page Class Notes was uploaded by Savanna Cruickshank on Friday October 23, 2015. The Class Notes belongs to CE 547 at University of Idaho taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/227782/ce-547-university-of-idaho in Civil Engineering at University of Idaho.


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Date Created: 10/23/15
Retaining Wall Problem for CE 547 Spring 2003 Lecture 27 Design and detail a cantilever retaining wall to support a bank of earth 16 ft high above the nal level of the earth at the toe of the wall The back ll is to be level but a building is to be built on the ll Assume the weight of the building may be represented by a 1000 psf surcharge Weight of retained material 120 pcf equivalent uid pressure 30 pcf angle of internal friction 35 degrees coef cient of friction between wall and soil 040 allowable foundation pressure 4000 psf minimum depth of frost penetration 36 inches for passive pressure use an equivalent uid pressure of 450 pcf For other information refer to the UBC97 or IBC use fc 4000 psi fy 60000 psi f Wall stem arm Toe YK39 f Heel quot K Footing Key base slab Building Plan y w n F720 ft4T i20 ft20 ft 40 fl Building Properties 4 fl 8 Thick Wall 4 r0 40 ksi EC 3600 ksi G 1440 ksi Wall Height 20 feet 20 H o 16 ft with 4 ft parapet 414 Thick Roof Slab Example Center of Rigidity Wall hwaii length thickness hI Kx Ky x Kxy Kyx ft ft in kin kin ft ft kipftin kipftin N 16 20 8 080 6475 o 30 40 258993 0 S 16 60 8 027 32882 0 30 o o o E 16 40 8 040 0 19780 60 20 0 1186813 W 16 40 8 040 0 19780 0 20 o 0 Sum 39357 39560 Sum 258993 1186813 Center of Ri idit Located at Yr Xr 658 3000 P E h stlffnesszkzgz 3 4 hwall 3 hwall 1Wall 1Wall 8 Center of Rigidity YL u fl 4 Tim ital 720 ital 720 fi 40 fl CIR r658 n T X 30 fl Example Center of Mass Centroid Weight x y Wx Wy kips kipIL kipIL Roof 128 30 20 3825 2550 NWall 24 30 40 720 960 SWall 72 30 0 2160 0 EWall 48 60 20 2880 960 WWall 48 0 20 0 960 320 a 585 5 430 Location of Center of Mass 11 Xm Ym 300 170 Center of Mass Y 50 f1 20 f2o it izo H 40 ft CM Accidental Eccentricity Y 60 n 20 Lg 720 n4 l720 11 40 ll 658 H r 7 X Example Torsional Constant Measured From Center of Rigidity Wall KX Ky xr yr Jr kin kin it it kipft2in N 6475 0 00 334 7231449 3 32882 0 00 66 1423938 E 0 19780 300 134 17802198 w 0 19780 300 134 17802198 Jr 44259783 L 283382883 ExampleNs Shear Forces on Wall Torsional Eccentricity ex Accidental Calculated it 00 5 30 Total Eccentricity it 30 ey Measured 39om 104 Center of Rigidity 20 ASCE 7 Horizontal Forces PX Py Pxey Total kips kips kip kip kip 0 50 00 1500 1500 Direct Torsional Total Wall Shear Shear Shear in Fyi in I FXI I kIps kips kIps kIps kIps kIps N 00 0 0 07 0 0 S 0 0 00 0 7 0 0 07 0 0 E 0 0 250 0 0 2 0 00 27 0 W 00 250 0 0 2 0 00 23 0 ExampleEW Shear Forces on Wall Torsional Eccentricity ex ey Measured 39om Calculated it 00 104 Center of Rigidity Accidental 5 30 20 ASCE 7 Total Eccentricity it 30 124 Torsional Moment Horizontal Forces PX Py Pxey Py ex Total kips kips kip kip kip 50 0 6207 00 6207 Direct Torsional Total Wall Shear Shear Shear FXI I FXI FyI FXI FyI kips kIps kips kips kips kips N 82 00 30 00 113 00 S 418 0 0 30 00 387 00 E 0 0 0 0 0 0 8 3 0 0 8 3 W 00 00 00 83 00 83


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