Shaking table tests of a self-centering designed bridge substructure

Cheng, Chin-Tung

doi:10.1016/j.engstruct.2008.05.017

Cited by 107 publications

(56 citation statements)

References 10 publications

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“…For instance, the beneficial effects that derive from uplifting and rocking have been implemented since the early 1970s in the South Rangitikei bridge in New Zealand (Beck and Skinner [30]). During the last decade, the benefits /challenges associated with the rocking of bridge piers have been receiving increasing attention partly because of growing interest in the prefabricated bridge technology (Wacker et al [31], Pang et al [32], Cohagen et al [33] and references reported therein) and partly because of the need for the bridge structure to recenter after a strong seismic event (Sakai et al [34], Cheng [35] among others).…”

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

“…The structural system is essentially a hybrid system (see Wacker et al [31], Cheng [35]) where the bridge pier is connected to its foundation and at the deck with a post-tensioned tendon that passes through the axis of the column together with longitudinal mild steel reinforcement running near the circumference of the column. During earthquake loading the majority of deformation is concentrated at the pier-foundation and pier-cap-beam interfaces and the overall deformation pattern of the post-tensioned pier-cap-beam system resembles the deformation pattern of the free-standing rocking frame that is under investigation in this study.…”

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

“…The peak horizontal displacement u max ranges from 20cm to 50 cm; while the vertical uplift is as high as 5cm. The evaluation of these response quantities shall be conducted in association with the equivalent response quantities from vertically post-tensioned hybrid frames (Wacker et al [31], Pang et al [32], Cheng [35]) and seismically isolated decks (Constantinou et al [36], Makris and Zhang [37], Buckle et al [38] among others) after considering the effects of the end-conditions of the deck at the abutments. This comparison/evaluation is the subject of an ongoing study which also examines other practical issues such as the effect of the crushing of the pivoting points of the columns (Roh and Reinhorn [39], [40]) and the accommodation of the deck uplift at the end-abutments.…”

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

“…This conclusion may eventually lead to the implementation of the free-standing rocking frame -a structural configuration where all the issues associated with seismic connections such as buckling and fracture of the longitudinal reinforcing bars or spalling of the concrete cover [31][32][33][34][35] Table 1: Earthquake records used for the seismic response analysis of the free-standing rocking bridge bent.…”

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

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Rocking Response and Stability Analysis of an Array of Free-Standing Columns Capped With a Free-Standing Rigid Beam

Makris¹,

Vassiliou²

2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This paper investigates the planar rocking response of an array of free-standing columns capped with a freely supported rigid beam in an effort INTRODUCTIONUnder base shaking slender objects and tall rigid structures may enter into rocking motion that occasionally results in overturning. Early studies on the seismic response of a slender rigid block were presented by Milne [1]; however, it was Housner [2] who uncovered a sizefrequency scale effect which explained why: (a) the larger of two geometrically similar blocks can survive the excitation that will topple the smaller block; and (b) out of two same acceleration amplitude pulses, the one with the longer duration is more capable to induce overturning. Following Housner's seminal paper a number of studies have been presented to address the complex dynamics of one of the simplest man-made structures-the free standing rigid column.Yim et al. [3] conducted numerical studies by adopting a probabilistic approach, Aslam et al. [4] confirmed with experimental studies that the rocking response of rigid blocks is sensitive to system parameters; while Psycharis and Jennings [5] examined the uplift of rigid bodies supported on viscoelastic foundation. Subsequent studies by Spanos and Koh [6] investigated the rocking response due to harmonic steady-state loading and identified "safe" and "unsafe" regions together with the fundamental and suharmonic modes of the system. Their study was extended by Hogan [7], [8] who further elucidated the mathematical structure of the problem by introducing the concepts of orbital stability and Poincare sections. The transient rocking response of free-standing rigid blocks was examined in depth by Zhang and Makris [9] who showed that there exist two modes of overturning: (a) by exhibiting one or more impacts; and (b) without exhibiting any impact. The existence of the second mode of overturning results in a safe region that is located on the acceleration-frequency plane above the minimum overturning acceleration spectrum. The fundamental differences between the response of a rocking rigid column (inverted pendulum) and the response of the linear elastic oscillator (regular pendulum) led to the development of the rocking spectrum (Makris and Konstantinidis In this paper we investigate the planar rocking response of an array of free-standing columns capped with a freely supported rigid beam as shown schematically in Figure 1. Herein we use the term "rocking frame" for the one degree of freedom structure shown in Figure 1. Sliding does not occur either at the pivot points at the base or at the pivot points at the capbeam. Our interest to this problem was partly motivated from the need to explain the remarkable seismic stability of ancient free-standing columns which support heavy free standing epistyles together with the even heavier frieze atop. As an example, Figure 2 shows the entrance view of the late archaic temple of Aphaia in the island of Aegina nearby Athens, Greece. Dates ranging from 510BC to 470BC have been proposed fo...

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Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

Section: Rocking Isolation Of Bridges -Proof Of Conceptmentioning

confidence: 99%

See 2 more Smart Citations

Rocking Response and Stability Analysis of an Array of Free-Standing Columns Capped With a Free-Standing Rigid Beam

Makris¹,

Vassiliou²

2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…Precast segmental construction of concrete bridge columns is a method in which bridge columns are segmentally prefabricated off site and erected on site typically with post-tensioning (Hewes 2002;Cheng 2008;Wang et al 2008;Yamashita and Sanders 2009;Dawood et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Totally Prefabricated Bridge Substructure Designed According to Korea Highway Bridge Design (KHBD) and AASHTO-LRFD

Kim

2013

Int J Concr Struct Mater

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The purpose of this study was to investigate the design comparison of totally prefabricated bridge substructure system. Prefabricated bridge substructure systems are a relatively new and versatile alternative in substructure design that can offer numerous benefits. The system can reduce the work load at a construction site and can result in shorter construction periods. The prefabricated bridge substructures are designed by the methods of Korea Highway Bridge Code (KHBD) and load and resistance factor design (AASHTO-LRFD). For the design, the KHBD with DB-24 and DL-24 live loads is used. This study evaluates the design method of KHBD (2005) and AASHTO-LRFD (2007) for totally prefabricated bridge substructure systems. The computer program, reinforced concrete analysis in higher evaluation system technology was used for the analysis of reinforced concrete structures. A bonded tendon element is used based on the finite element method, and can represent the interaction between the tendon and concrete of a prestressed concrete member. A joint element is used in order to predict the inelastic behaviors of segmental joints. This study documents the design comparison of totally prefabricated bridge substructure and presents conclusions and design recommendations based on the analytical findings.

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Planar rocking response and stability analysis of an array of free‐standing columns capped with a freely supported rigid beam

Makris

Vassiliou

2012

Earthq Engng Struct Dyn

198

231

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SUMMARY This paper investigates the planar rocking response of an array of free‐standing columns capped with a freely supported rigid beam in an effort to explain the appreciable seismic stability of ancient free‐standing columns that support heavy epistyles together with the even heavier frieze atop. Following a variational formulation, the paper concludes to the remarkable result that the dynamic rocking response of an array of free‐standing columns capped with a rigid beam is identical to the rocking response of a single free‐standing column with the same slenderness yet with larger size, that is a more stable configuration. Most importantly, the study shows that the heavier the freely supported cap beam is (epistyles with frieze atop), the more stable is the rocking frame regardless of the rise of the center of gravity of the cap beam, concluding that top‐heavy rocking frames are more stable than when they are top light. This ‘counter intuitive’ finding renders rocking isolation a most attractive alternative for the seismic protection of bridges with tall piers, whereas its potential implementation shall remove several of the concerns associated with the seismic connections of prefabricated bridges. Copyright © 2012 John Wiley & Sons, Ltd.

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Shaking table tests of a self-centering designed bridge substructure

Cited by 107 publications

References 10 publications

Rocking Response and Stability Analysis of an Array of Free-Standing Columns Capped With a Free-Standing Rigid Beam

Rocking Response and Stability Analysis of an Array of Free-Standing Columns Capped With a Free-Standing Rigid Beam

Comparison of Totally Prefabricated Bridge Substructure Designed According to Korea Highway Bridge Design (KHBD) and AASHTO-LRFD

Planar rocking response and stability analysis of an array of free‐standing columns capped with a freely supported rigid beam

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