Structure Failure Modes

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1 US Army Corps Monitoring and Maintenance of Coastal Infrastructure Structure Failure Modes Steven A. Hughes, PhD, PE Coastal and Hydraulics Laboratory US Army Engineer Research and Development Center Waterways Experiment Station 3909 Halls Ferry Road Vicksburg, Mississippi

2 US Army Corps Structure Failure Modes Contents Introduction Sloping-Front Structure Failure Modes Breakwaters and Jetties Revetments Vertical-Front Structure Failure Modes Caissons Gravity Walls Tied Walls Based on: CEM Chapter VI-2 (Author: Hans F. Burcharth)

3 US Army Corps Structure Failure Modes Key Point of This Presentation Competent design requires an understanding of all the possible ways in which a structure may fail.

4 US Army Corps Structure Failure Modes Failure Definition In general usage: The term "failure" implies total or partial collapse of a structure In the context of design reliability: "Failure" is damage that results in structure performance and functionality below the minimum anticipated by design.

5 US Army Corps Structure Failure Modes Reasons for Project Failure Design Failure occurs when: (1) Whole structure or some components cannot withstand loads beneath the design loads, or (2) Structure does not perform as intended. Load Exceedance Failure occurs because design loads are exceeded. Construction Failure arises due to incorrect or faulty construction practices or materials. Deterioration Failure is caused by structure deterioration and lack of proper maintenance.

6 US Army Corps Structure Failure Modes Project Failure Footnotes New or innovative designs are more susceptible to design failure due to lack of previous experience All projects have some level of load exceedance failure probability Load exceedance probability increases where little prototype data exist Safety factors should be increased to compensate for uncertainties in design

7 US Army Corps Structure Failure Modes Contents Introduction Sloping-Front Structure Failure Modes Breakwaters and Jetties Revetments Vertical-Front Structure Failure Modes Caissons Gravity Walls Tied Walls Based on: CEM Chapter VI-2 (Author: Hans F. Burcharth)

8 US Army Corps Sloping-Front Structures Overview of Rubble-Mound Breakwater Failure Modes

9 Sloping-Front Structures Armor Layer Instability (1 of 3)

10 Sloping-Front Structures Armor Layer Instability (2 of 3)

11 Sloping-Front Structures Armor Layer Instability (3 of 3)

12 US Army Corps Sloping-Front Structures Armor Layer Instability

13 US Army Corps Sloping-Front Structures Failure Due to Armor Unit Breakage

14 US Army Corps Sloping-Front Structures Failure Due to Armor Unit Breakage

15 Sloping-Front Structures Failure Related to Superstructures (1 of 3)

16 Sloping-Front Structures Failure Related to Superstructures (2 of 3)

17 Sloping-Front Structures Failure Related to Superstructures (3 of 3)

18 US Army Corps Sloping-Front Structures Backside Slope Failure Due to Overtopping

19 Sloping-Front Structures Failure Due to Toe Berm Erosion and Scour (1 of 2)

20 Sloping-Front Structures Failure Due to Toe Berm Erosion and Scour (2 of 2)

21 US Army Corps Sloping-Front Structures Failure Due to Toe Berm Erosion and Scour

22 Sloping-Front Structures Failure Due to Other Toe Problems (1 of 2)

23 Sloping-Front Structures Failure Due to Other Toe Problems (2 of 2)

24 Sloping-Front Structures Geotechnical Failures (1 of 3)

25 Sloping-Front Structures Geotechnical Failures (2 of 3)

26 Sloping-Front Structures Geotechnical Failures (3 of 3)

27 Sloping-Front Revetments Failure Due to Overtopping and Toe Erosion (1 of 2)

28 Sloping-Front Revetments Failure Due to Overtopping and Toe Erosion (2 of 2)

29 Sloping-Front Revetments Failure of Laid-Up Structures (1 of 2)

30 Sloping-Front Revetments Failure of Laid-Up Structures (2 of 2)

31 US Army Corps Sloping-Front Revetments Failure of Laid-Up Structures

32 US Army Corps Structure Failure Modes Contents Introduction Sloping-Front Structure Failure Modes Breakwaters and Jetties Revetments Vertical-Front Structure Failure Modes Caissons Gravity Walls Tied Walls Based on: CEM Chapter VI-2 (Author: Hans F. Burcharth)

33 US Army Corps Vertical-Front Caissons Summary of Failure Modes Global (Overall) Instability Foundation failure: Slip surface failure Foundation failure: Excessive settlement Overturning Lateral displacement or sliding on foundation Local Instability Hydraulic instability of rubble foundation Hydraulic instability of fronting rubble protection Seabed scour in front of structure Breakage and displacement of structural elements

34 Vertical-Front Caissons Global Failure Modes (1 of 5)

35 Vertical-Front Caissons Global Failure Modes (2 of 5)

36 Vertical-Front Caissons Global Failure Modes (3 of 5)

37 Vertical-Front Caissons Global Failure Modes (4 of 5)

38 Vertical-Front Caissons Global Failure Modes (5 of 5)

39 Vertical-Front Caissons Local Failure Modes (1 of 6)

40 Vertical-Front Caissons Local Failure Modes (2 of 6)

41 Vertical-Front Caissons Local Failure Modes (3 of 6)

42 Vertical-Front Caissons Local Failure Modes (4 of 6)

43 Vertical-Front Caissons Local Failure Modes (5 of 6)

44 Vertical-Front Caissons Local Failure Modes (6 of 6)

45 US Army Corps Vertical-Front Caissons Local Failure Modes

46 Vertical-Front Gravity Walls Seaward Failure Modes (1 of 2)

47 Vertical-Front Gravity Walls Seaward Failure Modes (2 of 2)

48 Vertical-Front Gravity Walls Landward Failure Modes (1 of 2)

49 Vertical-Front Gravity Walls Landward Failure Modes (2 of 2)

50 Vertical-Front Gravity Walls Foundation Failure Modes (1 of 2)

51 Vertical-Front Gravity Walls Foundation Failure Modes (2 of 2)

52 Vertical-Front Tied Walls Geotechnical Failure Modes (1 of 2)

53 Vertical-Front Tied Walls Geotechnical Failure Modes (2 of 2)

54 Vertical-Front Tied Walls Structural Failure Modes (1 of 3)

55 Vertical-Front Tied Walls Structural Failure Modes (2 of 3)

56 Vertical-Front Tied Walls Structural Failure Modes (3 of 3)

57 US Army Corps Vertical-Front Tied Walls Structural Failure Modes

58 US Army Corps Floating Structures Structural Failure Modes Failure of floating sections Failure of floating section connectors Failure of anchor system or pile supports Flooding and sinking of structure or some sections

59 US Army Corps Beach Fills Practical Realization Beach fills are placed on problem shorelines where erosion of the fill is expected. Judgement of success or failure is subjective, and often political opinions override engineering assessments. Recognized Failure Modes Failure to protect upland property or structures during storm events Movement of fill material to undesired locations Loss of fill material at a rate greater than anticipated for some reason other than design wave exceedance

60 US Army Corps Monitoring and Maintenance of Coastal Infrastructure Conclusions Important to identify potential failure mechanisms Most structures can fail in several different modes Don't confuse "failure" with "damage"

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