Research on Moment Amplitude Modulation Coefficient of Unbonded Prestressed Concrete Continuous Beam

2021 ◽  
Author(s):  
Chun-Feng Yang ◽  
Jia-Hui Yan ◽  
Zong-Bo Zhang
Keyword(s):  
Amplitude Modulation ◽  
Prestressed Concrete ◽  
Continuous Beam ◽  
Amplitude Modulation Coefficient ◽  
Modulation Coefficient

Nonlinear Finite Element Analysis on Statically Indeterminate Prestressed Concrete Beam

2012 ◽  
Vol 482-484 ◽  
pp. 647-650
Author(s):  
Shu Tian Fang ◽  
Ying Zhang ◽  
Wen Zhao Zhong
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Amplitude Modulation ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Bending Moment ◽  
Ultimate Bearing Capacity ◽  
Amplitude Modulation Coefficient ◽  
Modulation Coefficient ◽  
Limiting Value

Embarked from the ductility theory, the bending moment amplitude modulation limiting value ductility expression which satisfies the bearing capacity requirements have been deduced，on the value of the bending moment amplitude modulation coefficient, the influence of the using stage crack width limiting value has been considered, and the suggesting formula of the bending moment amplitude modulation coefficient has been proposed. With the aid of APDL language in the ANSYS, the entire process force analysis to statically indeterminate prestressed concrete beam has been carried on, the finite element computed result and the experiment result has been confirmed, through the example drew correlation curve, confirmed with the experiment, the beam's ultimate bearing capacity has been discussed, and the plastic hinge's formation and the influence of moment redistribution to the ultimate bearing capacity has been analyzed.

New Special Standards of the Frequency Deviation Unit and the Amplitude Modulation Coefficient Unit

2005 ◽  
Vol 48 (3) ◽  
pp. 260-262
Author(s):  
V. L. Ballo ◽  
V. B. Dobrovol’skii ◽  
A. V. Zen’kovich ◽  
V. A. Rekshinskii
Keyword(s):  
Amplitude Modulation ◽  
Frequency Deviation ◽  
Amplitude Modulation Coefficient ◽  
Modulation Coefficient

Research on Moment Modulation Coefficient of Unbounded Prestressed Concrete Continuous Beam

2011 ◽  
Vol 71-78 ◽  
pp. 1522-1527
Author(s):  
Chun Feng Yang ◽  
Min Yang
Keyword(s):  
Experimental Data ◽  
Prestressed Concrete ◽  
Simulation Analysis ◽  
Plastic Hinge ◽  
Nonlinear Finite Element ◽  
Continuous Beam ◽  
Equivalent Length ◽  
Curvature Ductility ◽  
Two Factors ◽  
Modulation Coefficient

Through simulation analysis of nonlinear finite element, research ideas on moment modulation coefficient of unbounded prestressed concrete (UPC) continuous beam is proposed ；Based on detailed analysis of the equivalent length of plastic hinge and curvature ductility, the two factors which influencing margin of moment modulation, calculating formulas of curvature ductility coefficient and moment modulation coefficient are established; Compared with the experimental data, the results which provided basic data for further research on plastic design of UPC continuous beam.

Amplitude modulation between multi-scale turbulent motions in high-Reynolds-number atmospheric surface layers

2018 ◽  
Vol 861 ◽  
pp. 585-607 ◽  
Author(s):  
Hongyou Liu ◽  
Guohua Wang ◽  
Xiaojing Zheng
Keyword(s):  
Reynolds Number ◽  
Surface Layer ◽  
Amplitude Modulation ◽  
High Reynolds Number ◽  
Quality Data ◽  
Modulation Effect ◽  
Multi Scale ◽  
Amplitude Modulation Coefficient ◽  
High Reynolds ◽  
Modulation Coefficient

Long-term measurements were performed at the Qingtu Lake Observation Array site to obtain high-Reynolds-number atmospheric surface layer flow data ($Re_{\unicode[STIX]{x1D70F}}\sim O(10^{6})$). Based on the selected high-quality data in the near-neutral surface layer, the amplitude modulation between multi-scale turbulent motions is investigated under various Reynolds number conditions. The results show that the amplitude modulation effect may exist in specific motions rather than at all length scales of motion. The most energetic motions with scales larger than the wavelength of the lower wavenumber peak in the energy spectra play a vital role in the amplitude modulation effect; the small scales shorter than the wavelength of the higher wavenumber peak are strongly modulated, whereas the motions with scales ranging between these two peaks neither contribute significantly to the amplitude modulation effect nor are strongly modulated. Based on these results, a method of decomposing the fluctuating velocity is proposed to accurately estimate the degree of amplitude modulation. The corresponding amplitude modulation coefficient is much larger than that estimated by establishing a nominal cutoff wavelength; moreover, it increases log-linearly with the Reynolds number. An empirical model is proposed to parametrize the variation of the amplitude modulation coefficient with the Reynolds number and the wall-normal distance. This study contributes to a better understanding of the interaction between multi-scale turbulent motions and the results may be used to validate and improve existing numerical models of high-Reynolds-number wall turbulence.

Construction of Fo Zhao Gui Dan Intercity Bridge Project in Guang Zhou

2014 ◽  
Vol 915-916 ◽  
pp. 133-136
Author(s):  
Xiang Hong Zhu ◽  
Zeng Bin Jiang
Keyword(s):  
Prestressed Concrete ◽  
Construction Method ◽  
Highway Bridge ◽  
Continuous Beam ◽  
Continuous Beam Bridge ◽  
Beam Bridge ◽  
The City

Construction of Fozhao intercity bridge in Guangzhou was a three-span prestressed concrete continuous beam bridge. The bridge adopted triangle hanging basket cantilever pouring construction method. The bridge mixed cable-stayed spans, H form tower and typical highway bridge elements. It spaned across the exiting transport hubs center, with modern and ethereal shape, and became a new landmark of the city.

An Adjusting Method for the Suspender Force of Continuous Beam Arch Combination Bridge Based on Influence Matrix

2013 ◽  
Vol 275-277 ◽  
pp. 1082-1085 ◽  
Author(s):  
Han Bing Liu ◽  
Long Lin Wang ◽  
Guo Jin Tan ◽  
Yong Chun Cheng
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Iterative Algorithm ◽  
Prestressed Concrete ◽  
Continuous Beam ◽  
Influence Matrix ◽  
Box Beam ◽  
Beam Bridge ◽  
Composite Box Beam

Based on a project of a 22+55+22m continuous composite box beam bridge made of prestressed Concrete, using influence matrix, Numerical Simulation and Iterative Algorithm, an adjusting method for suspender force of continuous beam arch combination bridge has been proposed. It uses Finite Element Numerical Model to calculate the influence matrix and Iterative Algorithm to calculate the suspender force. When rely on this project, the error could be under 0.05% through finite iterative algorithm. And the feasibility has been tested in the completed bridge. It turns out that the error of the measured suspender force of the completed bridge is smaller than that in the design.

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