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Sunday, October 4, 2020 | History

3 edition of Unseating of simply supported spans during earthquakes found in the catalog.

Unseating of simply supported spans during earthquakes

Panos Trochalakis

Unseating of simply supported spans during earthquakes

by Panos Trochalakis

  • 16 Want to read
  • 3 Currently reading

Published by Washington State Dept. of Transportation in [Olympia] .
Written in English

    Subjects:
  • Bridges -- Earthquake effects -- Washington (State),
  • Bridges -- Washington (State) -- Foundations and piers -- Testing,
  • Bridges, Concrete -- Washington (State) -- Testing,
  • Earthquake resistant design -- Washington (State)

  • Edition Notes

    Statementby Panos Trochalakis, Marc O. Eberhard, John F. Stanton.
    ContributionsEberhard, Marc O., Stanton, J. F., Washington State Transportation Commission., United States. Federal Highway Administration.
    The Physical Object
    Paginationiv, 39 p. :
    Number of Pages39
    ID Numbers
    Open LibraryOL19015809M
    OCLC/WorldCa36329777

      The seismic response of typical multispan simply supported (MSSS) and multispan continuous steel girder bridges in the central and southeastern United States is evaluated. Nonlinear time history analyses are conducted using synthetic ground motion for three cities for and 2,year return period earthquakes (10 and 2% probability of. 5. Numerical Analysis and Case Case. In order to study the nonlinear impact effect of multispan simply supported beam bridges under strong earthquakes, the artificial ground motion [] is used as the excitation source in the nonlinear dynamic open and impact stiffness values of gap/crush element are determined by a series of discrete values, namely, the open values are used, e.

    DOI: / Corpus ID: Devices for protecting bridge superstructure from pounding and unseating damages: an overview @inproceedings{ShresthaDevicesFP, title={Devices for protecting bridge superstructure from pounding and unseating damages: an overview}, author={Bipin Kumar Shrestha and Hong Hao and . During an earthquake, adjacent spans often vibrate out-of-phase, causing two deck unseating damage and pounding damage is analyzed. In single simply supported span. The overall viaduct length of m is divided in equal spans of 40 m, as represented in Fig.

    earthquake of 12 Nov. occurred adjacent to the bridge site [1]. Major damage occurred to the the girder ends, and the flexibility of the link-slab, the spans remained effectively simply supported for live It will also be noted that during unseating of the beam ends, the shear in the link spans will have. The spans of these decks are 40 m long and consist of seven lines of simply supported prestressed concrete box girders. The deck slab acts continuously over 10 span segments. The piers of the viaduct are single, hollow-core, reinforced-concrete columns whose heights vary from 10 m to 47 m.


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Unseating of simply supported spans during earthquakes by Panos Trochalakis Download PDF EPUB FB2

Unseating of simply supported spans during earthquakes [Trochalakis, Panos] on *FREE* shipping on qualifying offers. Unseating of simply supported spans during earthquakesAuthor: Panos Trochalakis. The Washington State Department of Transportation (WSDOT) is currently retrofitting many older bridges to prevent their superstructures form unseating during earthquakes.

In bridges whose simply supported spans have inadequate bearing lengths, WSDOT most frequently connects adjacent spans with high-strength rod restrainers. Unseating of Simply Supported Spans During Earthquakes Author: Bridge piers, Bridge superstructures, Bridges, Dislocation \(Geology\), Earthquake resistant design, Earthquake resistant structures, Evaluation, Mathematical models, Measures of effectiveness, Nonlinear systems, Prestress\ ed concrete bridges, Prevention, Retrofitting.

COVID For the latest COVID health guidance, statistics and resources, visit   During Unseating of simply supported spans during earthquakes book shaking, pounding of decks occurs in multi-span simply supported bridges (MSSS) when relative displacement between two adjacent decks exceeds the available expansion gap.

It may cause the failure of a bridge in various ways such as unseating of the deck, pier failure, bearing failure, and local damage to decks and : Lopamudra Mohanty, Rahul Das, Goutam Mondal.

A six-span simply-supported bridge with rigid bearings and multiple unseating prevention devices (restrainer and stopper) is analyzed under near-field ground motions recorded at JR Takatory and JMA Kobe during the Japan Kobe earthquake.

One of the most frequent modes of failure of these bridges was the unseating of their simply supported spans (Saiidi et al. The problem becomes more intense when the gaps between the. The collapse of bridges due to unseating at intermediate (in-span) hinges during recent earthquakes emphasizes the need to provide an adequate number of restrainers to limit the relative displacement between frames in a bridge with inadequate hinge seat width.

Maintaining a sufficient support length at abutments, piers, or in-span hinges of bridges is essential to preventing span unseating during earthquakes. Hence, minimum support length (MSL) is always the primary consideration in the seismic design of bridges, which has been extensively specified in modern bridge codes.

Failure of girder ends and bearing damage due to pounding of adjacent simply-supported spans were reported after the Bhuj earthquake in Gujarat, India. Pounding damage between adjacent bridge structures were also observed in the Wenchuan earthquake [5], Chile earthquake [6] and more recently in the Christchurch earthquake.

The multi-span bridge considered in this analysis consists of three spans supported on multi-column bents, as shown in Fig. Each bent has four columns and each span has 11 girders. The span lengths are m (40 ft), m (80 ft), and m (40 ft), and the width is m (64 ft).

Keywords: composite, bridges, unseating, behavior, analysis, bearings 1. Introduction Bridge bearings are crucial components of highway networks and require both corrective and preventative maintenance actions.

The author has presented a study for the effect of bridge girders unseating for a simply supported composite bridge. during earthquakes. The collapse of the Gavin Canyon Undercrossing and the 14/5interchange during the Northridge earthquake has proven the inadequacy of the currently used steel restrainers (Saiidi et al ).

A number of other devices have been presented in the past two decades as unseating prevention devices for bridges, such Figure 3. bridge to deck unseating during the same earthquake shaking. for which the bridge spans are still. to prevent unseating in simply supported bridges subjected to strong earthquakes were.

In simply-supported spans, the induced of pounding and deck unseating damage depending on the curvature radius. of building damage during the Chi-Chi earthquake to those of building.

Characteristics of pounding at beam end under strong earthquake was studied, dealing with a typical HSR PC simply-supported beam bridge with span of 4×m.

Performance of seismic shear keys as a widely used unseating prevention device were also analyzed. Several conclusions were as follows.

The unseating and pounding damage at expansion joints during earthquakes emphasizes the need to restrain the relative opening and closing displacements between adjacent bridge spans.

A three-span simply supported highway bridge located in Vancouver, British Columbia, Canada, is chosen as a case study. for preventing the bridge spans from unseating during an extreme. The nonlinear response of the bridge was studied to determine the maximum opening experienced at the in-span hinge and the maximum relative abutment displacements.

To identify the parameters most important in restrainer design and in predicting the unrestrained maximum relative abutment displacements, the researchers varied eleven parameters.

Seismic Fragility of Multispan Simply Supported Bridge with Drop Spans and Steel Bearings. Multispan simply supported bridges with drop spans and steel bearings were commonly constructed in northern India during the s, and little knowledge about their seismic behavior is available in the literature.

As can be seen, this bridge is a four-span simply supported RC slab-on-grider bridge and the total length is m. The heights of three bridge piers are different and the longest bridge pier is #2 pier. The RC girders are supported on the double.

Fig. 1 shows the proposed unseating mechanism of a skew bridge during earthquake shaking by Buckle et al. and Priestley et unseating sequence is described as follows. Step 1. Under biaxial earthquake actions, the bridge moves towards one of the abutments (left abutment in Fig.

1), closes the gap, and impacts against the abutment back wall. Recent earthquakes have highlighted the major problem of unseating due to excessive relative hinge displacements during an earthquake (Schiff ).To limit the relative hinge displacements, researchers have used a variety of unseating prevention devices, including steel cable restrainers, steel rods, shock transmission units, and other similar technologies (Kim et alSaiidi .