Seismic performance of repaired hollow-bridge piers

Cheng, Chin-Tung; Yang, Jyh-Csyang; Yeh, Y.-K.; Chen, Shen-En

doi:10.1016/s0950-0618(02)00119-8

Cited by 65 publications

(30 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to statistics on Chinese high-pier railway bridges, around 90 % of these bridges are in the west of China, and approximately 40 % of them have piers higher than 40 m. Furthermore, these mountainous railway bridges with piers of varying heights usually have continuous and rigid frame girders in the superstructure and thin-walled hollow piers. Most of these bridges in western area of China exceed specification requirements and are different from highway bridges with relatively flexible main girders [2]. On the other hand, the southwest area of China, where these railway bridges are located, is a dense seismic zone (e.g., the 2008 Wenchuan Earthquake occurred on May 12, 2008 in Sichuan province with an earthquake magnitude 8,0, and the Lushan Earthquake on April 20, 2013, also in Sichuan province, with an earthquake magnitude 7,0) [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

et al. 2016

View full text Add to dashboard Cite

Original scientific paper The objectives of this paper are to perform a comparative analysis of the large-scale system of a high-pier railway bridge subjected to stationary and nonstationary spatially varying earthquake excitations using the pseudo-excitation method (PEM), and to estimate whether or not the non-stationary stochastic analysis of the high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary random analysis to avoid excessive computation. Based on the finite element software ANSYS, the stationary and non-stationary stochastic excitations analyses of a high-pier bridge were transformed into harmonic analyses and deterministic transient analyses in the study, respectively, by using PEM. The wave-passage effect and the incoherence effect were modelled as the key factors, a total of twelve cases were considered to investigate the wave-passage effect and incoherence effect on the seismic response of a high-pier railway bridge under stationary and non-stationary earthquake excitations. Results show that structural responses under stationary excitation are larger than those under non-stationary by considering either the wave-passage effect or the incoherence effect. Through comparing structural responses under stationary excitation with those under non-stationary one, all the growth rates are less than 25 %, which is acceptable in engineering, meaning that a non-stationary stochastic analysis of high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary analysis to avoid excessive computation.Keywords: high-pier railway bridge; incoherence effect; non-stationary stochastic excitation; pseudo-excitation method; wave-passage effect Analiza željezničkog mosta na visokim stupovima pod prostornim stohastičkim stacionarnim i ne-stacionarnim uzbudama potresaIzvorni znanstveni članak Ciljevi ovoga rada su provesti komparativnu analizu velikog sustava željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim prostorno promjenjivim uzbudama potresa primjenom metode pseudo-uzbude (pseudo-excitation method -PEM), te procijeniti može li se ili ne može nestacionarna stohastička analiza željezničkih mostova na visokim stupovima izloženih trosmjernim prostornim podzemnim gibanjima zamijeniti jednostavnijom stacionarnom slučajnom analizom kako bi se izbjegla prekomjerna računanja. Zasnovane na ANSYS softveru konačnih elemenata, analize stacionarnih i ne-stacionarnih stohastičkih uzbuda mosta na visokim stupovima pretvorile su se u harmonične analize i determinističke prijelazne analize u našem istraživanju, primjenom PEM-a. Učinak prolaza vala i učinak nekoherentnosti modelirani su kao ključni čimbenici, a ukupno je razmotreno dvanaest slučajeva u svrhu ispitivanja učinka prolaza vala i učinka nekoherentnosti na seizmičku reakciju željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim uzbudana potresa. Rezultati pokazuju da je reakcija konstrukcije pod stacionarnom uzbudom veća ...

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Most studies have focused on flexural or shear strengthening or repair application of various types of members or providing confinement in case of columns. Among the studies on repair, most have focused on columns with slight or moderate damage in which concrete, steel, or FRP jacketing was used to restore the strength and displacement capacity (Elkin et al 1999;Stoppenhagen et al 1995;Chai et al 1991;Saadatmanesh et al 1997;Cheng et al 2003). Few studies, however, have focused on repairing severely damaged ductile RC bridge columns, especially those with buckled or fractured longitudinal reinforcing bars (Elkin et al 1999;Cheng et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Among the studies on repair, most have focused on columns with slight or moderate damage in which concrete, steel, or FRP jacketing was used to restore the strength and displacement capacity (Elkin et al 1999;Stoppenhagen et al 1995;Chai et al 1991;Saadatmanesh et al 1997;Cheng et al 2003). Few studies, however, have focused on repairing severely damaged ductile RC bridge columns, especially those with buckled or fractured longitudinal reinforcing bars (Elkin et al 1999;Cheng et al 2003). Although these techniques have been shown to be effective in restoring the strength and displacement capacity, rapid repair was not emphasized, and timely reopening of the bridge was not a consideration.…”

Section: Introductionmentioning

confidence: 99%

Rapid Repair of Severely Damaged RC Columns with Different Damage Conditions: An Experimental Study

Sneed

Belarbi

2013

Int J Concr Struct Mater

View full text Add to dashboard Cite

Rapid and effective repair methods are desired to enable quick reopening of damaged bridges after an earthquake occurs, especially for those bridges that are critical for emergency response and other essential functions. This paper presents results of tests conducted as a proof-of-concept in the effectiveness of a proposed method using externally bonded carbon fiber reinforced polymer (CFRP) composites to rapidly repair severely damaged RC columns with different damage conditions. The experimental work included five large-scale severely damaged square RC columns with the same geometry and material properties but with different damage conditions due to different loading combinations of bending, shear, and torsion in the previous tests. Over a three-day period, each column was repaired and retested under the same loading combination as the corresponding original column. Quickset repair mortar was used to replace the removed loose concrete. Without any treatment to damaged reinforcing bars, longitudinal and transverse CFRP sheets were externally bonded to the prepared surface to restore the column strength. Measured data were analyzed to investigate the performance of the repaired columns compared to the corresponding original column responses. It was concluded that the technique can be successful for severely damaged columns with damage to the concrete and transverse reinforcement. For severely damaged columns with damaged longitudinal reinforcement, the technique was found to be successful if the damaged longitudinal reinforcement is able to provide tensile resistance, or if the damage is located at a section where longitudinal CFRP strength can be developed.

show abstract

“…Metal and composite panels or wraps have been investigated for repair of damaged existing structures, such as bridge girders (Aidoo et al 2004), columns (Mirmiran 1997;Saadatmanesh 1997;Pessiki 2001;Kim et al 2007 andSen andMullins 2007) and hollow piers (Cheng et al 2003). Badawi and Soudki (2005) reported that composite laminates can protect concrete structures by reducing the effects of corrosion stemming from the environment.…”

Section: Introductionmentioning

confidence: 99%

“…For pier repair, careful removal of the damaged sections and the use of grouting or reinforced concrete to repair the section need to be conducted with extreme care and caution (Cheng et al 2003). The selection of appropriate primer and panel material is also essential to the success of the technique.…”

Section: Introductionmentioning

confidence: 99%

SLSE Damage Detection Technique for Foundation Strengthening Using Plates

2010

View full text Add to dashboard Cite

This paper discusses the use of a vibrationbased technique for damage detection in metal and composite plate wrappings for pier foundation repairs. The SLSE (Scanning Laser-Strain Energy) method relies on full-field laser modal scanning and strain energy computation to establish damage locations within composite wrappings. Strain energy distribution relies on segmental derivation of detected deflection shapes; hence, large numbers of spatial data points are required. By providing high spatial data density, laser scanner complement nicely with the damage detection technique. Using an aluminum plate and a composite plate, results from a baseline scan test is presented in this paper to demonstrate the show the high potential of this technique for detecting damage in plates commonly used for structural repairs.

show abstract

Seismic performance of repaired hollow-bridge piers

Cited by 65 publications

References 3 publications

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

Rapid Repair of Severely Damaged RC Columns with Different Damage Conditions: An Experimental Study

SLSE Damage Detection Technique for Foundation Strengthening Using Plates

Contact Info

Product

Resources

About