Improvement in seismic configuration of slender Reinforced Concrete wall piers on isolated footings

Published on Jan 1, 2010
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Abstract
In the current seismic design practice, capacity design of slender Reinforced Concrete (RC) wall piers without enlarged boundary elements and on shallow footing considers plastic hinge to occur at the base along with prevention of other modes of failure during strong earthquake shaking. However, the re-entrant corner of wall pier-footing junction makes it vulnerable to significant damages during strong earthquake shaking. This may require costly seismic retrofitting of bridge footing after every earthquake. The present study investigates a new geometric configuration at wall pierfooting junction concerned with smooth flow of forces from the pier to the footing. A wall pier from a continuous bridge is provided with linear and curvilinear tapered configurations at the bottom. Linear elastic finite element analysis is carried out in SAP2000 program using 8-noded solid elements for modeling both the wall pier and the footing, and smeared spring elements for soil flexibility. Actual vertical forces and maximum possible lateral forces are estimated during the formation of plastic hinge at the base of the wall pier. Under these forces, the proposed wall pier-footing system exhibits rigid block-type behaviour irrespective of soil flexibility. It is observed that curvilinear taper with a particular profile ensures the most favorable stress distribution and prevents damage in footing below ground level. The region of damage is located above the tapered region and this can be located above normal ground level. Strategies are presented to suitably proportion the tapered wall pier-footing portion. These strategies are based on three criteria, namely (a) geometry of the curvilinear taper, (b) bearing failure of the underlying soil, and (c) length of footing in contact with the soil. In most of the cases, bearing failure criterion of soil governs the dimensioning of the wall pier-footing system. The detailed parametric study shows the necessity of stress-based design philosophy of tapered wall pier-footings.
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1 Author (H E Moore)
References6
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#1John Lewis Bignell (UIUC: University of Illinois at Urbana鈥揅hampaign)H-Index: 2
#2James M. LaFave (UIUC: University of Illinois at Urbana鈥揅hampaign)H-Index: 21
Last. Neil M. Hawkins (UIUC: University of Illinois at Urbana鈥揅hampaign)H-Index: 17
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Abstract Pushover analyses were conducted to assess the seismic vulnerability of wall pier supported highway bridges on southern Illinois priority emergency routes. Three-dimensional finite element models were developed to reflect typical hammerhead and regular wall pier bridges from a random sample of the bridge inventory. The models incorporated expected nonlinear structural and material behavior of all the bridge components鈥攕uperstructure, expansion joints, approach embankments and/or abutmen...
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Abstract When the bridge piers with shallow foundation are subject to intensive earthquake excitations, uplift of foundations will occur and the foundation soil will partly become plastic. It is very difficult to use an accurate method to simulate the uplifting and yielding of supporting soil. An improved Winkler foundation model, which could be used to consider the uplift and yield, was employed in the analysis. The 1940 El Centro earthquake record is inputted to a rigid pier with shallow found...
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#1Tomohiro MikiH-Index: 4
#2Junichiro NiwaH-Index: 10
Last. Manakan LertsamattiyakulH-Index: 1
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#1N A Abo-ShadiH-Index: 3
#2Mehdi S. SaiidiH-Index: 16
Last. David SandersH-Index: 76
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This research evaluated the out-of-plane seismic behavior of representative bridge pier walls that exist in the United States and developed an analytical model to determine the seismic response of bridge pier walls. A comprehensive bridge pier wall survey was conducted based on seven one-half scale wall specimens designed and tested under slow cyclic loads that were perpendicular to the plane of the walls. The confinement steel in all the specimens was less than that required in current seismic ...
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#1M. J. N. PriestleyH-Index: 13
#2F. SeibleH-Index: 2
Last. Gian Michele CalviH-Index: 34
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This book should be of interest to practicing bridge designers and researchers investigating the seismic design of bridges. It is appropriate for graduate courses or upper level undergraduate courses in seismic design of bridges. The approach relies heavily on the principles of capacity design, where a strength hierarchy is established in a bridge to ensure that damage is controllable and occurs only where the designer intends. This approach, which is well established for seismic design of build...
This paper describes theoretical and experimental studies related to seismic evaluation and retrofit of bridge column footings. One "as-built" model column footing and three retrofit model column footings were tested under simulated seismic actions. Test results of the "as-built" footing showed that column/footing joint shear failure is a potential danger to existing bridge structures. Test results also revealed that if there is no dependable tensile capacity in the pile/footing connection, a ro...
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