# Bridge Abutment Design. Doug Parmerlee, PE Department Manager, Bridge Design, Michigan

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1 Bridge Abutment Design Doug Parmerlee, PE Department Manager, Bridge Design, Michigan March 17, 2015

2 LRFD Compared with ASD LRFD is supposed to be a more rational method imposing larger load factors on variable loads (such as live load) and smaller load factors on loads which are well defined (such as dead load). ASD treated all loads equally. LRFD seems to impose higher horizontal pressures as compared with the ASD methodology. Pile driving vibrations seem to be more pronounced with LRFD. Increase in foundation costs with LRFD. Page 2

3 DESIGN PHILOSOPHY General Equation ηη ii γγ ii QQ ii φφrr nn = RR rr (LRFD 1.3.2) ηη DD = Ductility Load Modifier (LRFD 1.3.3) ηη RR = Redundancy Load Modifier (LRFD 1.3.4) ηη II = Operational Importance Load Modifier (LRFD 1.3.5) γγ ii = Load Factor (LRFD 3.4) QQ ii = Force Effect (LRFD 3.5+) φφ = Resistance Factor RR nn = Nominal Resistance RR rr = Factored Resistance Page 3

5 LOADS Thermal forces from superstructure (TU) Usually from shear deformation of elastomeric bearings Braking forces from superstructure (BR) Wind on live load on superstructure (WL) Wind on structure (WS) Live load surcharge (LS) Page 5

6 LIVE LOAD SURCHARGE (LS) 6

7 EPS Backfill Much lighter than sand backfill. Induces virtually no horizontal pressures on abutment (Prudent to design for some amount of horizontal pressure). Requires a PVC liner to protect it from petroleum spills. Requires a concrete cap slab to distribute traffic loads. More expensive than sand backfill, but could cause other cost savings. Page 7

9 LOAD CASES AND COMINATIONS Load Cases described in the MDOT Bridge Design Manual section LRFD Load Combination Limit States (LRFD 3.4). Abutment Loading also discussed in LRFD I came up with are a minimum of 30 combinations. Need more combinations for flooding, scour, seismic, vehicle collision on retaining walls. Page 9

10 LOAD CASES AND COMBINATIONS One of the principles of LRFD is to combine loads to cause the most severe force effects. Permanent loads have variable load factors Using minimum load factor for some loads may produce more severe force effects on certain components. Load combination naming convention: A intended to produce maximum toe bearing values. A2 intended to produce maximum heel bearing values. B intended to produce minimum horizontal resistance and maximum eccentricity. Page 10

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41 GEOTECHNICAL AXIAL PILE RESISTANCE Geotechnical resistance depends on method of installation MDOT uses ϕ dyn = 0.50, while LRFD suggests ϕ dyn = 0.40, for piles installed using the FHWA modified Gates Formula (i.e. in accordance with Section 705 of the MDOT Standard Specifications for Construction). ϕ dyn = 0.65 when using dynamic testing with signal matching (PDA testing) according to the MDOT Special Provision for Dynamic Pile Testing. ϕ dyn = 0.80 when using one static load testing per zone with dynamic testing with signal matching on at least 2% of production piles. Example: If the driven resistance (R ndr ) is equal to 600 kips, then the factored resistance (R r ) is equal to 300 kips using the modified Gates formula. Page 41

42 LATERAL PILE RESISTANCE Lateral pile resistance is the result of movement (i.e. pile flexure and interaction with the surrounding soil). P-Y method using Lpile to determine lateral resistance. See example to the right. Use free-head analysis for typical pile embedment of 6 inches. Resistance is based on the amount of tolerable movement. Page 42

43 LATERIAL PILE RESISTANCE Assume ~1.5 movement for Strength Limit States to mobilize resistance*. Assume ~1.0 movement for Service Limit States to mobilize resistance*. *Bridge and Geotechnical Engineer to discuss. Lateral pile resistance is NOT the same as the resistance from the horizontal component of battered piles. Usually provided by the geotechnical engineer. Must apply pile P-Multipliers (P m ) (LRFD ). Page 43

44 LATERAL PILE RESISTANCE Page 44

45 HORIZONTAL RESISTANCE FROM BATTERED PILES Is not equal to the horizontal component of a piles driven factored resistance (does not satisfy static equilibrium). It is equal to the horizontal component of the axial reaction on a battered pile (satisfies static equilibrium). Page 45

46 PILE REACTION DETERMINATION Assumes footing is rigid for distribution of loads to piles. Based on concepts presented in: Foundation Engineering, 2 nd Edition by Peck, Hanson and Thornburn. Pile Foundations, 2 nd Edition by Chellis. Minnesota DOT LRFD Bridge Design Manual. Can be used for 2 or more rows of piles. For battered piles, vertical pile reactions determine the resulting horizontal pile reactions, which are used to resist external horizontal loads. LRFD provides a method for calculating eccentricity for spread footings. Page 46

47 PILE REACTION DETERMINATION The equation for eccentricity (e) can be simplified as: Where: ee = MM uuuu VV uu MM uuuu =Factored moments about point C (i.e. B/2) VV uu =Factored vertical loads Page 47

48 PILE REACTION DETERMINATION The eccentricity for a pile supported footing is the difference between the pile group neutral axis and the location of the resultant force. Calculate the moment of inertia of the pile group about the neutral axis of the pile group. Parallel Axis Theorem ΣI + ΣAd 2 is the basis for calculating pile reactions. Page 48

49 PILE REACTION DETERMINATION The moment of inertia of the pile is insignificant in this calculation. Area changed to the number of piles, so the formula reduces to: NN dd 2 Where: N=Number of piles per foot of wall. d=distance from pile group neutral axis to center of individual rows. Page 49

50 PILE REACTION DETERMINATION Vertical reaction on piles is calculated using the following basic stress formula: ff = PP AA + MMMM II The formula is modified for piles as follows: RR = VV NN + VVVVVV II Page 50

51 PILE REACTION DETERMINATION Horizontal reaction of battered piles is equal to vertical reaction divided by the batter. Must adjust footing size and pile locations until the horizontal resistance (horizontal reaction of battered piles + lateral resistance of all piles) equals or exceeds the applied horizontal forces. It is convenient to use a spreadsheet or MathCad to perform these calculations. Page 51

52 PILE REACTION DETERMINATION Page 52

53 PILE REACTION DETERMINATION Case 4 Strength IIIA Driven resistance (Kips) R ndr 500 Resistance factor ϕ 0.75 Factored axial resistance (Kips) ϕr n 375 Row 1 Row 2 Row 3 Total Number of Piles/Foot N Location of Row from B/2 D B/ N*D B/2 (Feet) N*D B/2 TOT /N TOT - Location of Pile Group Neutral Axis from B/2 D NA Location of Row from Pile Group Neutral Axis (Feet) d Moment of Inertia = N*d 2 (Feet 2 ) I Summation of factored vertical loads (Kips) ΣV u Summation of factored moments (Kip-Feet) ΣM u Summation of factored horizontal forces (Kips) ΣH u Location of Vertical Load from B/2 (Feet) e Location of Vertical Load from Pile Group Neutral Axis E First term of equation (Kips/Pile) ΣV u /N Second term of equation (Kips/Pile) ΣV u Ed/I Vertical reaction per pile (Kips) R v Horizontal reaction per pile (Kips) R h Horizontal reaction per pile per foot (Kips) R h Axial reaction per pile (Kips) R All Piles<ϕR n GOOD Factored lateral resistance per pile (Kips) Factored lateral resistance per foot (Kips) Factored horizontal resistance per foot (Kips) >ΣH u GOOD Page 53

54 COMPARISON BETWEEN EPS AND SAND BACKFILL Page 54

55 STRUCTURAL DESIGN Design flexural reinforcement in walls and footing Crack control checks typically fail in footing due to excessive cover. Maximum moment may not necessarily occur at back face of wall when supported by multiple rows of piles. Check shear strength of concrete in walls and footing Typically do not add shear reinforcement. Must check two-way and punching shear in footing. Maximum shear may not necessarily occur at back face of wall when supported by multiple rows of piles. Page 55

56 REFERENCES AASHTO LRFD Bridge Design Specifications, 6 th Edition Michigan DOT Bridge Design Manual Minnesota DOT LRFD Bridge Design Manual Robert Chellis, Pile Foundations, 2 nd Edition, McGraw- Hill, 1961 (out of print) R. Peck, W. Hanson, T. Thornburn, Foundation Engineering, 2 nd Edition, John Wiley & Sons, html Page 56

57 THANK YOU QUESTIONS?

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