Dynamic response of long-span bridges subjected to nonuniform excitation: a state-of-the-art review

Abstract

In recent years, considerable attention has been paid to the research of dynamic response of long-span bridges with particular emphasis on seismic behavior. Cable-stayed and suspension bridges are the most popular types. Since long-span bridges have multi-supports and extreme lengths, due to the spatial variation effects, the ground motions at different supports might be non-uniform. A state-of-the-art update review of the response of long-span bridges subjected to non-uniform excitation is presented. The review mainly focuses on the theoretical aspects of non-uniform excitation, numerical studies, and experimental studies to verify some of the theoretical findings. In this paper, a review of the use of shake-table in experimental studies of long-span bridges is also presented. The non-uniform cases considered include a time delay with the same support excitations, multiple support excitations, and the combination of the first and the later. The results are discussed and summarized in comparison to the cases of uniform support excitation.

Numerical comparative study on seismic response of half-span and full-span scaled models of a floating type cable-stayed bridge

“…The general description of the main bridge and the typical cross-section of the bridge was described in detail by [8] as shown in Figure 1 and Figure 2.…”

“…On the basis of the factors discussed, a comparative study between cable-stayed bridges during construction (half span bridges) and full span bridges is considered necessary. In light of the fact that this study is a continuation of an experimental study conducted by [8], the scaled bridge model utilized in the experiment is utilized in this study. A 1/160 scale model of a cable-stayed bridge was subjected to a variety of earthquake excitation directions, including in the direction of the bridge's longitudinal axis, at 45 degrees, and at 90 degrees to the longitudinal axis using the Midas/Civil software.…”

Semi-active Control of Continuous Girder Bridges Considering the Coupling Effect of Earthquake and Hydrodynamic Pressure

“…In this paper, the clipped-optimal control algorithm is selected to realize semi-active control [19]. The algorithm computes the theoretical control force fc based on an active controller Kc, the observed structural response xm and the measured MR control force fm: (20) where, (⋅) is the Laplace transform operator.…”

“…Without loss of generality, the seismic excitation was simulated with four common ground motions in benchmark problems, namely, El Centro wave (NS, 1940), Hachinohe wave (NS, 1968), JMA Kobe wave (NS, 1995) and Northridge wave (NS, 1994) [20][21]. The dominant frequencies are 1.47 Hz, 0.36 Hz, 1.46 Hz and 0.63Hz, respectively, and the maximum acceleration peaks are 3.417 m/s 2 , 2.250 m/s 2 , 8.178 m/s 2 and 8.268m/s, respectively.…”

Shake Table Test of Long Span Cable-Stayed Bridge Subjected to Near-Fault Ground Motions Considering Velocity Pulse Effect and Non-Uniform Excitation

“…Since the length of long-span CSBs is comparable to the seismic wavelength, it is intuitively clear that all supports should be excited by the non-uniform motions [10]. Shiravand and Parvanehro studied the seismic response of CSBs under non-uniform and uniform excitations [11].…”