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Hw # 4

Design of Concrete Structure II. University of Palestine. بسم الله الرحمن الرحيم. Hw # 4. Instructor:. Eng. Mazen Alshorafa. Design of Concrete Structure II. University of Palestine. Page 1/8. Eccentrically loaded Footing. Problem # 1.

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Hw # 4

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  1. Design of Concrete Structure II University of Palestine بسم الله الرحمن الرحيم Hw # 4 Instructor: Eng. Mazen Alshorafa

  2. Design of Concrete Structure II University of Palestine Page 1/8 Eccentrically loaded Footing Problem # 1 Design an isolated footing to support an interior column 0.6m×0.4m PD = 1200 kN and PL = 600 kN MD = 160 kN.m and ML = 80 kN.m Use fc’= 28 MPa , fy = 420 MPa, and qall net = 220 kpa P M 0.6 0.4 Instructor: Eng. Mazen Alshorafa

  3. Design of Concrete Structure II University of Palestine Page 2/8 Rectangular Combined Footing Problem # 2 Design a rectangular combined footing, to support two internal columns spaced at distance 4.5 m center-to-center as shown in Figure. Each column has a 0.4mx0.4m square, and carries service dead and live loads of 1200kNs and 300kNs respectively. Use fc’= 21 MPa , fy = 420 MPa, and qall net = 180 kpa A B 0.4 0.4 0.4 0.4 PD=1200kN PD=1200kN PL=300kN PL=300kN ?? m ?? m 4.5 m ?? m Instructor: Eng. Mazen Alshorafa

  4. Design of Concrete Structure II University of Palestine Page 3/8 Rectangular Combined Footing Problem # 2 Design a rectangular combined footing, to support two columns A and B spaced at distance 4 m center-to-center as shown in Figure. Column A is 0.3mx0.3m, and carries a dead load of 1000kNs and a live load of 400kNs. Column B is 0.5mx0.3m, and carries a dead load of 1500kNs and a live load of 600kNs. Use fc’= 21 MPa , fy = 420 MPa, and qall net = 220 kpa A B 0.3 0.3 0.3 0.5 PD=1200kN PD=1200kN PL=300kN PL=300kN ?? m ?? m 4.5 m ?? m Instructor: Eng. Mazen Alshorafa

  5. Design of Concrete Structure II University of Palestine Page 4/8 Rectangular Combined Footing Example # 2 Design a combined footing, to support two columns A and B spaced at distance 5.5 m center-to-center as shown in Figure Column A is 0.45mx0.6m and carries a dead load of 750kNs and a live load of 550kNs Column B is also 0.6mx0.6m in cross section but carries a dead load of 1200 kNs and a live load of 880 kNs. Use fc’= 21 MPa , fy = 420 MPa, and qall net = 250 kpa A B 0.6 0.6 0.45 0.6 Property limit PD=750kN PD=1200kN PL=550kN PL=880kN ?? m 5.5 m ?? m Instructor: Eng. Mazen Alshorafa

  6. Design of Concrete Structure II University of Palestine Page 5/8 Trapezoidal Combined Footing Example # 3 Design a combined footing, to support two columns A and B spaced at distance 5.0 m center-to-center as shown in Figure Column A is 0.4mx0.4mand carries a dead load of 1000kNsand a live load of 750kNs Column B is also 0.3mx0.3min cross section but carries a dead load of 600 kNs and a live load of 450 kNs. Use fc’= 28 MPa , fy = 420 MPa, and qall net = 200 kpa A B 0.3 0.4 0.4 0.3 Property limit PD=1000kN PD=600kN PL=750kN PL=450kN ?? m 5 m Instructor: Eng. Mazen Alshorafa

  7. Design of Concrete Structure II University of Palestine Page 6/8 Continuous Footing Example # 4 Design a combined footing, to support three columns A, B, and C as shown in Figure. Column A is 0.4mx0.4m and carries a dead load of 660kNs and a live load of 330kNs, column B is also 0.4mx0.4m in cross section but carries a dead load of 1000 kNs and a live load of 500 kNs, and column C is also 0.4mx0.4m in cross section but carries a dead load of 770 kNs and a live load of 385 kNs. Use fc’= 25 MPa , fy = 420 MPa, and qall net = 160 kpa C A B 0.4 0.4 0.4 0.4 0.4 0.4 PD=660kN PD=1000kN PD=770kN PL=330kN PL=500kN PL=385kN ?? m L2 L1 4.0 m 5.3 m Instructor: Eng. Mazen Alshorafa

  8. Design of Concrete Structure II University of Palestine Page 7/8 Continuous Footing with Spine Beam Example # 5 Design a combined footing, to support three columns A, B, and C using a 0.5m wide spine beam as shown in Figure. Column A is 0.4mx0.4m and carries a dead load of 660kNs and a live load of 330kNs, column B is also 0.4mx0.4m in cross section but carries a dead load of 1000 kNs and a live load of 500 kNs, and column C is also 0.4mx0.4m in cross section but carries a dead load of 770 kNs and a live load of 385 kNs. Use fc’= 25 MPa , fy = 420 MPa, and qall net = 160 kpa C A B 0.4 PD=660kN PD=1000kN PD=770kN 0.4 0.4 PL=330kN PL=500kN PL=385kN 0.4 0.4 0.4 A B C 4.0 m 5.3 m Instructor: Eng. Mazen Alshorafa

  9. Design of Concrete Structure II University of Palestine Strap Beam Page 8/8 Strap Footing Example # 6 Design a strap footing to support two columns A, and B as shown in Figure. Column A is 0.45mx0.6m and carries a dead load of 750kNs and a live load of 550kNs, and column B is also 0.6mx0.6m in cross section but carries a dead load of 1200kNs and a live load of 880kNs. Use fc’= 21 MPa , fy = 420 MPa, and qall net = 150 kpa A B 0.6 0.6 Property limit 0.45 0.6 PD=750kN PD=1200kN 5.5 m PL=550kN PL=880kN Instructor: Eng. Mazen Alshorafa

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