THE EFFECT OF VERTICAL COMPONENT OF NEAR FAULT AND FAR FAULT EARTHQUAKES ON THREE SPAN RAILWAY BRIDGES

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FEZZEH M.; MOHARRAMI H.; DANESHJOO F.

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:1 Page(s): 103-116

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Title

THE EFFECT OF VERTICAL COMPONENT OF NEAR FAULT AND FAR FAULT EARTHQUAKES ON THREE SPAN RAILWAY BRIDGES

Author(s)

FEZZEH M. | MOHARRAMI H. | DANESHJOO F. | Issue Writer Certificate

Keywords

VERTICAL COMPONENT OF EARTHQUAKEQ2

DYNAMIC ANALYSESQ1

NEAR-FAULT RECORDQ2

FAR-FAULT RECORDQ2

RAILWAY BRIDGEQ2

BOX GIRDERQ2

PRESTRESSED BRIDGEQ2

Abstract

Abstract -----------------------------Many bridge engineers assume that vertical ground motions during seismic events are unimportant. Current seismic design requirements do not attempt to account for vertical motion effects. Of earthquakes. However the Study on the Accelerometers of the past earthquake indicates that the vertical acceleration can reach values comparable to (and sometimes even higher than) the horizontal accelerations.Some of design codes presume that vertical ground shaking effects can be crudely included in design codes by increasing or decreasing the dead load actions in load combination equations. The current application of this approach is found in the AASHTO Seismic Isolation Guide Specification that uses ±20% of the dead load, in the testing requirements to represent vertical effects of earthquake, irrespective of its magnitude, fault distance, and soil type.For ordinary standard bridges constructed on sites where the peak rock acceleration is expected to be more than 0.6 g, SDC-2006 requires consideration of vertical effects, but does not require analysis of the structure under combined horizontal and vertical components of the ground motion Instead, it stipulates the check of the nominal capacity of the structure subjected to an equivalent vertical load with a magnitude of 25% of the dead load (DL) of the structure applied separately in the upward and downward directions to account for vertical effects.In some other design approaches, that attempt to consider VERTICAL COMPONENT OF EARTHQUAKE explicitly in the design, a vertical response spectrum with ordinates arbitrarily set at two-thirds of the appropriate horizontal response spectrum at the site is considered. However, recent studies including the present study have clearly demonstrated that this vertical-to-horizontal ratio in many cases underestimates the severity of the vertical component in the near-fault region and at short periods.This study investigates the effect of vertical component of near fault and far fault earthquakes on three span RAILWAY BRIDGEs of variable spans with BOX GIRDER cross sections.Results of bridge analyses when vertical motions of earthquake are included in earthquake effects are compared to the case when vertical motions are excluded.Comparison of the results show that the vertical components of ground motions cause significant amplification in the axial force demand in the columns and moment demands in the BOX GIRDER at both the midspan and at the face of the joints to column. Another finding from the linear analytical study is the fact that the effect of vertical component is completely uncoupled to the horizontal effects.Comparison of the results obtained, with the results obtained from SDC-2006 suggestions shows that a unit multiplier of the dead load effect for compensation of vertical effect of earthquake is not always appropriate. Therefore, for considering the effect of an earthquake's vertical component, preferably it is suggested that the vertical and horizontal components of earthquake is considered simultaneously. On behalf of such analysis, this study suggests different Dead Load Multipliers for different internal forces depending on their positions on the bridge.

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APA: Copy

FEZZEH, M., MOHARRAMI, H., & DANESHJOO, F.. (2016). THE EFFECT OF VERTICAL COMPONENT OF NEAR FAULT AND FAR FAULT EARTHQUAKES ON THREE SPAN RAILWAY BRIDGES. MODARES CIVIL ENGINEERING JOURNAL, 16(1), 103-116. SID. https://sid.ir/paper/256748/en

Vancouver: Copy

FEZZEH M., MOHARRAMI H., DANESHJOO F.. THE EFFECT OF VERTICAL COMPONENT OF NEAR FAULT AND FAR FAULT EARTHQUAKES ON THREE SPAN RAILWAY BRIDGES. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(1):103-116. Available from: https://sid.ir/paper/256748/en

IEEE: Copy

M. FEZZEH, H. MOHARRAMI, and F. DANESHJOO, “THE EFFECT OF VERTICAL COMPONENT OF NEAR FAULT AND FAR FAULT EARTHQUAKES ON THREE SPAN RAILWAY BRIDGES,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 1, pp. 103–116, 2016, [Online]. Available: https://sid.ir/paper/256748/en

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