Details:

Creators:
Bernica, Andrew ; Rasheed, Hayder
Bernica, Andrew ; Rasheed, Hayder Less -
Corporate Creators:
Kansas State University. Transportation Center
Corporate Contributors:
Kansas. Dept. of Transportation. Bureau of Research
Subject/TRT Terms:
[+]
Concrete Bridges Cracking Deck-Girder Bridges Girder Bridges Girders Load Factor Load Rating Plate Girder Bridges Ratings Reverse Diagonal Shear Cracking
Publication/ Report Number:
Report No. K-TRAN: KSU-15-2
Resource Type:
Tech Report
Geographical Coverage:
Kansas ; United States
Kansas ; United States Less -
Corporate Publisher:
Kansas. Dept. of Transportation. Bureau of Research
Abstract:
Reverse diagonal shear cracking at reinforced concrete girder supports affects many low-volume bridges built

in the early 1900s in Kansas. This phenomenon, however, is not addressed in the American Association of State

Highway and Transportation Officials (AASHTO, 2002) Standard Specifications for Highway Bridges or American

Concrete Institute specifications. This study investigates causes of this cracking and develops Bridge Rating of

Inclined Damage at Girder Ends (BRIDGE), an Excel-based software, to determine load rating of a user-specified

bridge with reverse diagonal shear cracking at girder supports. A user interface creates a grillage model of an existing

bridge and places various rating trucks on the bridge. Equivalent flexibility analysis distributes truck live loads within

deck panels to surrounding girders and diaphragms. Stiffness matrices are utilized to find nodal displacements and

reactions at the girder supports caused by truck live loads and bridge dead load. These reactions are checked against

RISA software models to test the accuracy of the stiffness matrix application. ABAQUS FE models and Mohr’s circle

stress distribution determine driving and clamping forces on the crack due to resolution of dead and live load reactions

and friction force generated between the concrete girder and rusty steel bearing pad along the shear crack orientation.

In addition to the simplified modified compression field theory, these clamping and driving forces are used to

determine the shear capacity of each girder at the reverse cracks. A modified version of Equation 6B.4.1 from the

Manual for Bridge Evaluation (AASHTO, 2011) is used to find operating and inventory rating factors (RFs) for the

bridge.

The BRIDGE program, used to load rate Bridge No. 54-104-15.45, yielded reasonable RFs for various trucks

and reduced girder widths. The operating RFs were consistently above 1 and the inventory RFs were below 1,

indicating that the decision to load post this bridge is based on the engineer’s judgment.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:7f81e2cb222f42eaa8aa1626b57d914a8da9debc07849c53545153be1dc5ab0f
Download URL:
https://rosap.ntl.bts.gov/view/dot/32231/dot_32231_DS1.pdf
File Type:

Supporting Files

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