Construction of Benten Viaduct, rigid-frame bridge with seismic isolators at the foot of piers

Yoshikawa, Minoru; Hayashi, Hidenao; Kawakita, Shiro; Hayashida, Mitsuhiro

doi:10.1016/s0958-9465(99)00047-5

Cited by 8 publications

(5 citation statements)

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“…The objective function for parameter identification can be expressed as the difference between the analytical and measured displacements. The objective function can be expressed as shown in Equation (5).…”

Section: Objective Functionmentioning

confidence: 99%

“…Frame structures, particularly those related to civil engineering, are widely used in various structural configurations such as buildings and bridges [ 1 ]. The area of continuous rigid-frame bridges has been investigated [ 2 , 3 , 4 , 5 , 6 , 7 ]. Yoshikawa et al [ 5 ] investigated the seismic design and construction techniques of the Benten Viaduct, which is a continuous rigid-frame bridge featuring 19 spans.…”

Section: Introductionmentioning

confidence: 99%

“…The area of continuous rigid-frame bridges has been investigated [ 2 , 3 , 4 , 5 , 6 , 7 ]. Yoshikawa et al [ 5 ] investigated the seismic design and construction techniques of the Benten Viaduct, which is a continuous rigid-frame bridge featuring 19 spans. Zhou et al [ 6 ] proposed a unified calculation model for the longitudinal fundamental frequency of continuous rigid-frame bridges and validated its applicability by performing experiments on a continuous rigid-frame bridge in Shaanxi Province.…”

Section: Introductionmentioning

confidence: 99%

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Parameter Identification of Multispan Rigid Frames Using a Stiffness Separation Method

Xiao,

Yan,

Meng

et al. 2024

Sensors

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Identifying the parameters of multispan rigid frames is challenging because of their complex structures and large computational workloads. This paper presents a stiffness separation method for the static response parameter identification of multispan rigid frames. The stiffness separation method segments the global stiffness matrix of the overall structure into the stiffness matrices of its substructures, which are to be computed, thereby reducing the computational workload and improving the efficiency of parameter identification. Loads can be applied individually to each separate substructure, thereby guaranteeing obvious local static responses. The veracity and efficacy of the proposed methodology are substantiated by applying it to three- and eight-span continuous rigid frame structures. The findings indicate that the proposed approach significantly enhances the efficiency of parameter identification for multispan rigid frames.

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Section: Objective Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parameter Identification of Multispan Rigid Frames Using a Stiffness Separation Method

Xiao,

Yan,

Meng

et al. 2024

Sensors

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“…In addition, during an earthquake event these long-span structures can also experience different ground motion excitations at each support point [7], which is known as spatially variable ground motions (SVGM) including wave passage effects, coherency effects and local site effects. Previous studies [1][2][3][4][5][8][9] of large continuous RC frame bridges have indicated that the structural configuration and the spectral characteristics of the input motions have significant influence on the seismic response. There might be potential risks in using an inapplicable design code and ignoring the influence of SVGM when calculating the seismic response of large bridges in mountainous regions.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear seismic analysis of a high-pier, long-span, continuous RC frame bridge under spatially variable ground motions

Crewe

2018

Soil Dynamics and Earthquake Engineering

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Many very large bridges with high piers and long spans are under rapid construction in mountainous regions especially in Western China. However, the current seismic design methods in China are based on a code which only applies to bridges with span up to 150 m. To evaluate the risk of the inapplicable design method and the influence of spatially variable ground motions (SVGM) on the seismic response of very large bridges, a high-pier, long-span, continuous RC frame bridge is numerically studied. This study considers whether multiple support excitation can be simplified into specific uniform excitation cases while guaranteeing the conservative seismic demands for this bridge.Non-stationary SVGM on both bedrock and the surface of multiple soil layers are simulated including wave passage effects, coherency effects and site amplification effects. The nonlinear dynamic finite element model of the bridge is analysed for two groups of earthquake motions, namely group 1 -bedrock and group 2 -ground surface excitations. Each group contains three different excitations, i.e. i) multiple support excitation ii) the largest and iii) the smallest accelerations from the SVGM. The relative displacements, internal force responses and ultimate damage modes are obtained and compared. For this bridge the uniform ground motion input with the largest accelerations provides conservative seismic demands for most structural components when the site amplification effect is not considered (group 1).However, for the ground surface motions, where site amplification needs to be taken into account (group 2), in several cases the uniform ground motion with the largest accelerations results in lower response than that predicted when considering SVGM. The present results indicate that only when the bridges are located on ideal simple topography where site effects have little influence, the uniform excitation with the largest accelerations taken from the SVGM may be an alternative input for seismic analysis.However, for bridges on complex terrain, where site effects can significantly amplify the ground motions at the bedrock, SVGM need to be applied as input for the seismic analysis. As spatial variability of input motion is not a mandatory requirement in the Chinese bridges design code, these results suggest that the existing design code for very large bridges should be modified accordingly.

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“…The Benten Viaduct collapsed during the Hanshin Earthquake in Japan, 1995. Base-isolation technology was used during the reconstruction, with lead rubber bearings (LRB) set at the bottom of the piers [13]. Base-isolation technology is different from conventional seismic techniques and has achieved a wider range of isolation from the superstructure to substructure, and even from the foundation.…”

Section: Introductionmentioning

confidence: 99%

Base-isolation design of single-tower cable-stayed bridges: a case study in meizoseismal area

Yan¹,

Xia²

2018

J. vibroeng.

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The single-tower cable-stayed bridge is one of the most popular types of bridges. Seismic design for this type of bridge, however, is rather difficult. When subjected to longitudinal earthquakes, the tower stands as the weakest part of all the bridge components. To solve this problem, a base-isolation design was developed and adopted for a practical single-tower cable-stayed bridge. In this design, laminated elastomeric bearings (EB) and liquid viscous dampers (LVD) were installed to serve as a base-isolation layer inside the tower cap. Numerical analysis was then conducted to investigate the variations of dynamic characteristics and seismic responses between conventional designs and base-isolation designs. LVD were used on the top of the transition pier to optimize the seismic system of the bridge. It was found that: i) the seismic loads acting on the bridge component were reduced as the seismic displacements increased. This was the result of amplification of the bridge vibration period by the EB in the base-isolation layer; ii) the seismic displacements were restrained by the LVD in the base-isolation layer, but the seismic forces increased due to improper parameter values; and iii) the seismic response decreased further by the transition pier's LVD.

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Construction of Benten Viaduct, rigid-frame bridge with seismic isolators at the foot of piers

Cited by 8 publications

References 0 publications

Parameter Identification of Multispan Rigid Frames Using a Stiffness Separation Method

Parameter Identification of Multispan Rigid Frames Using a Stiffness Separation Method

Nonlinear seismic analysis of a high-pier, long-span, continuous RC frame bridge under spatially variable ground motions

Base-isolation design of single-tower cable-stayed bridges: a case study in meizoseismal area

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