Capacity of scour-damaged bridges, part 2 : Integrated Analysis Program (IAP) - a program for the analysis of lateral performance of pile-supported structures under scour conditions.

Details

• Creators:
  Lin, Cheng ; Bennett, Caroline ; Han, Jie ; Parsons, Robert ; Parr, A. David
• Corporate Creators:
  University of Kansas. Dept. of Civil, Environmental and Architectural Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Bridge foundations
  • Bridge substructures
  • Scour
  • Bearing capacity
  • Failure
  • State departments of transportation
  • Inventory
  • Software
  • Structural analysis
• Publication/ Report Number:
  K-TRAN: KU-10-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Materials & Research
• Abstract:
  Scour is the removal of soils in the vicinity of bridge foundations, resulting in a reduced capacity of the foundations, which can increase the risk of bridge ; failure. To minimize bridge failure, the Federal Highway Administration (FHWA) has established a requirement that all state highway agencies should evaluate ; whether bridges in their inventory are scour-susceptible. Accordingly, it is critical that state Departments of Transportation (DOTs) are able to determine quickly ; and effectively which bridges in their inventories are scour-critical, enabling responsible management of those bridges during and after scour events. It is of ; importance to identify and explore analytical methods for determining bridge system susceptibility to scour events. ; To analyze bridge behavior under scour conditions, the bridge should be considered as a whole system including interactions between soil, foundation, and ; bridge superstructure behavior. To this end, the Integrated Analysis Program (IAP) has been developed; the IAP software is specifically aimed at analyzing lateral ; behavior of pile-supported bridges under scour conditions. However, the IAP is also able to deal with a variety of other structures (e.g. water/oil tanks, offshore ; platforms, and buildings) in addition to bridge structures. The IAP consists of two components: the Soil Spring Module (SSM) and the structural analysis software, ; STAAD.Pro 2007. The purpose of the SSM is to capture the effects of soils that support pile foundations as a series of nonlinear soil springs based on the soil loaddisplacement ; curves (i.e. p-y curves). With the seamless link between the SSM and STAAD.Pro 2007 using OpenSTAAD 2.6 functionality, the soil model ; (expressed as nonlinear soil springs) is successfully integrated with a traditional structural analysis model. In this report, operation of the IAP, technical ; development, and four examples are presented. ; The first section of this report has been devoted to the operation of the IAP (Chapters 2 and 3). Most of the content of this section is focused on the operation ; of the SSM, since operation of STAAD.Pro is well-documented in its proprietary user’s manual. The description of the operation of the SSM includes topics such ; as how to retrieve pile parameters from STAAD.Pro, input soil parameters, and how to perform a scour analysis. ; The second section of this report presents the technical development of the SSM (Chapters 4 and 5), including descriptions of the p-y curves for different soil ; types (e.g. sand, soft/stiff clays, and rocks), generation of multilinear soil springs from the p-y curves, and the approximate approach chosen to account for secondorder ; structural stability effects. Methodology for code development is also presented in this section. ; Finally, four examples demonstrating use of the IAP are presented in Chapter 6. These examples cover the topics of a laterally loaded single pile, a laterally ; loaded pile group, an entire bridge, and determining the buckling capacity of a bridge and bridge piles. The step-by-step instruction for each example is shown ; during the analysis. Results obtained from using the IAP approach for analyzing the laterally loaded single pile and pile group were compared to results obtained ; from analyses performed using both LPILE and FB-Multipier, and the calculated results were shown to agree very well. Finally, behavior of an entire bridge was ; investigated using IAP and a discussion regarding scour effects on the lateral behavior of the bridge and buckling capacity of the bridge and bridge piles has been ; presented.
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• Format:
  PDF
• Funding:
  C1862
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26660/dot_26660_DS1.pdf
• File Type:
  [PDF - 1.96 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:98529a32a19bebf5aa40aff6fdc9cc58c603490d4f8d776832295bd843d2bc9f