Closure to “Prestress Force Effect on Vibration Frequency of Concrete Bridges” by M. Saiidi, B. Douglas, and S. Feng

Saiidi, Mehdi S.; Douglas, Bruce M.; Feng, Shumin

doi:10.1061/(asce)0733-9445(1996)122:4(460.x)

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…More training samples can trains the network more intelligent. First of all, the existing data are collected, such as: Saiidi's test beam data [3] and PSC beam test in 2005 and the test data in 2006 in Huazhong University of Science and Technology [4]. In previous trials, the parameters kinds of PSC are not comprehensive enough.…”

Section: Test Of Psc Beammentioning

confidence: 99%

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Nature Frequency Identification of Prestressed Concrete Beam with RBF Network

Yang

2012

AMR

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Abstract. The relationship of pre-stressed concrete (PSC) beam natural frequency and pre-stressed force is difficult to described accurately with mechanical model. The past experimental data are collected. Then five unbonded post-tensioned PSC beams are designed. Frequencies and damps are collected in the dynamic experiment of five PSC beams. Radial basis function neural network is constructed to identify the natural frequencies of prestressed beam with different levels prestressing force based on previous test data and new dynamic test beam data. Then the input and output node numbers of neural network are selected and the appropriate training algorithm and expansion coefficient is determined. In order to verify that the network performance, one prestressed concrete beam test data are left to simulation test. Simulation results show that the radial basis function neural network is feasibility to recognize the frequency of PSC beams.

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Section: Test Of Psc Beammentioning

confidence: 99%

“…But there are not precise calculation model can accurately calculating PSC structural dynamic parameters. There are complex interactions vibration waves between concrete and unbonded tendons [2,3]. So the general vibration theory is difficult to reflect the PSC beam vibration performance accurately.…”

Section: Introductionmentioning

confidence: 99%

Nature Frequency Identification of Prestressed Concrete Beam with RBF Network

Yang

2012

AMR

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“…Furthermore, the range of structural period for which equal displacement rule is true has been specified . The research is performed on single‐degree‐of‐freedom systems; however, inelastic response of multi‐degree‐of‐freedom systems can be estimated directly by the elastic response of single‐degree‐of‐freedom system as a function of its natural period and effective damping …”

Section: Introductionmentioning

confidence: 99%

Quantifying panel zone effect on deflection amplification factor

Mohammadi

Kordbagh

2017

Structural Design Tall Build

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Drift is a dominant feature in tall-building design and can dictate the selection of structural systems. Because a reliable estimate of actual drifts is crucial for controlling structural damage, estimating drift considering intricate details seems noteworthy. In order to estimate story drifts during massive quakes, seismic design provisions generally specify a deflection amplification factor (C d ) to amplify elastic design drifts. In most of these codes, the amount of C d is calculated from line-element models without considering panel zone effects, despite the panel zone intensifying the story drift considerably. Therefore, the effect of panel zone on the story drift and C d has been investigated in the current paper. Because C d is independent of the number of stories, 4-story frames, as benchmarks for special steel moment frames, with different thicknesses of the panel zone, are used. The effect of panel zone is provided as a correction factor for C d . The results show that the panel zone should be considered in the analytical models; otherwise, the story drift will be underestimated up to 35%. Finally, a relation has been derived to consider panel zone effects on C d , as a function of the panel zone thickness.KEYWORDS deflection amplification factor, modification factor, nonlinear time history analysis, panel zone, special moment-resisting frames, story drift | INTRODUCTIONAlthough nowadays it is possible to access different earthquake records, the use of this method is not common for designing conventional structures because of complication of performing nonlinear time history analyses. Therefore, the use of simplified methods of analyses to estimate the maximum inelastic response of structures during strong earthquakes is still an important and unavoidable matter. On this basis, in most seismic design provisions, the maximum lateral displacement of structures is estimated by amplifying the drifts computed from an elastic analysis with a deflection amplification factor.The first researches in this field were performed by Veltsos and Newmark [1] and Veltsos et al. [2] They investigated single-degree-of-freedom systems subjected to simple pulses and three earthquakes. They found that in the range of small frequencies (frequencies less than 0.38 Hz), the maximum displacement of an elastic-perfectly plastic system can be considered identical with the maximum displacement of an elastic system having stiffness equal to the initial stiffness of the elastic-perfectly plastic system. These observations caused the formation of the equal displacement. In addition, it was obtained that in the range of high and relative high frequencies, the maximum inelastic displacement of the elastic-perfectly plastic system is remarkably greater than the maximum displacement of the corresponding elastic system is. [3] After that, many researches have been performed, in which the effects of record properties, soil type, P-Δ effects, ductility, and the indexes of hysteretic curve on the ratio of inelastic displacement to the elasti...

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“…Construction deviation and structural damage can cause prestressing loss, so it is important to detect the size of the effective prestresssing force. However, according to the existing research results as shown in the papers [1][2][3][4], there is no final conclusion about the effect of prestressed on dynamic characteristics, and further study is necessary.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Natural Vibration Frequency for Unbounded Prestressed Concrete Beams

Zhao

2013

AMM

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An experimental investigation on the dynamic characteristics of unbounded prestressed concrete simply support beams is presented. A total of 5 unbounded prestressed concrete simply support beams were constructed and tested. The influence of prestressing on natural vibration frequency of concrete beams is studied by applying prestress gradually. A model of variable stiffness is proposed to calculate the natural vibration frequency of unbounded prestressed concrete beams. The finite element program Sap2000 is used to calculate the frequency of unbounded prestressed concrete beams. The results show that the calculating results agree well with experimental ones.

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Closure to “Prestress Force Effect on Vibration Frequency of Concrete Bridges” by M. Saiidi, B. Douglas, and S. Feng

Cited by 6 publications

References 1 publication

Nature Frequency Identification of Prestressed Concrete Beam with RBF Network

Nature Frequency Identification of Prestressed Concrete Beam with RBF Network

Quantifying panel zone effect on deflection amplification factor

Finite Element Analysis of Natural Vibration Frequency for Unbounded Prestressed Concrete Beams

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