An Approximate Algorithm for Calculating Composite Fundamental Frequency of Single Column Pier with Cast-In-Situ Bored Pile Foundation Based on Frequency Synthesis Method

2015 ◽  
Author(s):  
Lipeng An ◽  
Dejian Li ◽  
Peng Yu
Keyword(s):  
Fundamental Frequency ◽  
Pile Foundation ◽  
Synthesis Method ◽  
Approximate Algorithm ◽  
Frequency Synthesis ◽  
Bored Pile ◽  
Single Column

scholarly journals A New Method for Evaluating the Bearing Capacity of the Bridge Pile Socketed in the Soft Rock

2021 ◽  
Vol 11 (13) ◽  
pp. 5923
Author(s):  
Yao Lu ◽  
Dejian Li ◽  
Shiwei Jia ◽  
Kai Wang
Keyword(s):  
Bearing Capacity ◽  
Fundamental Frequency ◽  
Pile Foundation ◽  
Synthesis Method ◽  
Soft Rock ◽  
Test Method ◽  
New Method ◽  
Frequency Synthesis ◽  
Capacity Coefficient ◽  
Vertical Restraint

Aiming at the rock-socketed pile in the soft rock area, this paper studies the inherent constitutive relationship between the vertical restraint stiffness at the pier bottom and the bearing capacity of the pile foundation. A new method to evaluate the bearing capacity of the pile foundation is proposed. Based on the Rayleigh energy method and the Southwell frequency synthesis method, the analytical expression of the vertical vibration fundamental frequency of the pier was calculated, and the constraint stiffness expression of the pier bottom was derived. By investigating the impact of parameters on the bearing capacity coefficient of the pile foundation, the fitting formula of the bearing capacity coefficient was obtained by multiple linear regression. Then, with this method, the vertical fundamental frequency of the pier was obtained through a field dynamic test to calculate the vertical constraint stiffness and evaluate the bearing capacity of the rock-socketed pile in the soft rock area. This method can overcome the shortcomings of the traditional static load test method, such as the high cost, long cycle, and poor representativeness. Finally, this method’s accuracy was verified by comparing field measurements and finite element simulation results. The results show that the difference between the code design constraint stiffness and the constraint stiffness by the frequency synthesis method was about 0.7%, and the bearing capacity difference between the analytical solution and the numerical simulation was small. The new method is accurate and effective.

The Engineering Accident Analysis of Cast-In Situ Bored Pile

2012 ◽  
Vol 446-449 ◽  
pp. 1514-1519
Author(s):  
Bin Tang ◽  
Ting Wang ◽  
Zi Ning Shan
Keyword(s):  
Pile Foundation ◽  
Bridge Engineering ◽  
Foundation Engineering ◽  
Construction Process ◽  
Floating Pile ◽  
Bored Pile ◽  
Wrong Identification ◽  
Catheter Tube ◽  
The Impact

Abstract: Cast-in situ bored pile is a common form of pile foundation and widely used in road and bridge engineering in China. Because of complex cast-in situ bored pile construction process, high technical content requirement, vulnerable to the impact of human and environmental factors, cast-in situ bored piles prone to various kinds of quality problems in the construction process, such as drilling deflection, drilling hole collapse and diameter reduction, wrong identification of pile-end’s bearing stratum, catheter tube blockage, reinforcement cage floating, pile breaking, pile silted, etc. These problems often make it difficult to meet the design requirements into a pile formation, and difficultly to remedy. In this paper, Zhoutian Zhenjiang bridge at Shaoguan City, Qujiang to Nanxiong highway A03 contract bid package cast-in situ bored pile foundation engineering encountered in the construction collapsed hole, inclined hole, catheter tube blockage and other issues for example to analyzes the cause of cast-in situ bored pile engineering accident, made appropriate preventive measures and processing method.

Mechanism of Gold Nanoparticle Formation in the Classical Citrate Synthesis Method Derived from Coupled In Situ XANES and SAXS Evaluation

2010 ◽  
Vol 132 (4) ◽  
pp. 1296-1301 ◽  
Author(s):  
Jörg Polte ◽  
T. Torsten Ahner ◽  
Friedmar Delissen ◽  
Sergey Sokolov ◽  
Franziska Emmerling ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Synthesis Method ◽  
Nanoparticle Formation ◽  
In Situ Xanes

scholarly journals Dealloying progress during nanoporous structure evolution analyzed by in situ resistometry

2017 ◽  
Vol 19 (44) ◽  
pp. 29880-29885 ◽  
Author(s):  
Eva-Maria Steyskal ◽  
Michael Seidl ◽  
Matthias Graf ◽  
Roland Würschum
Keyword(s):  
Electrochemical Synthesis ◽  
Synthesis Method ◽  
Nanoporous Structure ◽  
Structure Evolution ◽  
Nanoporous Structures

The progress of dealloying, an electrochemical synthesis method capable of producing nanoporous structures with bulk outer dimensions, is studied by in situ resistometry.

Negative Permittivity Behavior in Silver/Polyaniline Metacomposites Induced by the Low-Frequency Plasmonic Oscillation

2021 ◽  
Author(s):  
Jiahong Tian ◽  
Runhua Fan ◽  
Zongxiang Wang ◽  
Jiahao Xin ◽  
Zhongyang Wang
Keyword(s):  
Synthesis Method ◽  
Low Frequency ◽  
In Situ Synthesis ◽  
Negative Permittivity ◽  
Free Electrons ◽  
Dominant Effect ◽  
Equivalent Circuit Analysis ◽  
Inductive Character ◽  
Percolation Network

Abstract Silver/polyaniline (Ag/PANI) composites were prepared by an in-situ synthesis method. Interestingly, the permittivity changed from positive to negative along with the formation of percolation network. The plasma oscillations of free electrons from the network made a dominant effect on the negative permittivity behavior. Further investigation based on equivalent circuit analysis revealed that the composites with negative permittivity presented inductive character. The epsilon-negative composites can be applied to electromagnetic shielding, absorbing and attenuation.

Poly(3,4-ethylenedioxythiophene)/MoS2 nanocomposites with enhanced electrochemical capacitance performance

RSC Advances ◽  
2014 ◽  
Vol 4 (100) ◽  
pp. 56926-56932 ◽  
Author(s):  
Jin Wang ◽  
Zongchao Wu ◽  
Huabing Yin ◽  
Wei Li ◽  
Yang Jiang
Keyword(s):  
High Performance ◽  
Synthesis Method ◽  
Good Stability ◽  
Facile Synthesis ◽  
Electrochemical Capacitance ◽  
Capacitance Performance

A facile synthesis method of PEDOT/MoS2 nanocomposites has been developed via in situ polymerization, and this work offers a strategy for preparing supercapacitors with high performance and good stability.

scholarly journals Network of Palladium-Based Nanorings Synthesized by Liquid-Phase Reduction Using DMSO-H2O: In Situ Monitoring of Structure Formation and Drying Deformation by ASEM

2020 ◽  
Vol 21 (9) ◽  
pp. 3271 ◽  
Author(s):  
Takuki Komenami ◽  
Akihiro Yoshimura ◽  
Yasunari Matsuno ◽  
Mari Sato ◽  
Chikara Sato
Keyword(s):  
Surface Tension ◽  
Liquid Phase ◽  
Aqueous Solutions ◽  
Critical Point ◽  
Synthesis Method ◽  
Three Dimensional ◽  
In Situ Monitoring ◽  
Critical Point Drying ◽  
Micrometer Size

We developed a liquid-phase synthesis method for Pd-based nanostructure, in which Pd dissolved in dimethyl sulfoxide (DMSO) solutions was precipitated using acid aqueous solution. In the development of the method, in situ monitoring using atmospheric scanning electron microscopy (ASEM) revealed that three-dimensional (3D) Pd-based nanonetworks were deformed to micrometer-size particles possibly by the surface tension of the solutions during the drying process. To avoid surface tension, critical point drying was employed to dry the Pd-based precipitates. By combining ASEM monitoring with critical point drying, the synthesis parameters were optimized, resulting in the formation of lacelike delicate nanonetworks using citric acid aqueous solutions. Precipitation using HCl acid aqueous solutions allowed formation of 500-nm diameter nanorings connected by nanowires. The 3D nanostructure formation was controllable and modifiable into various shapes using different concentrations of the Pd and Cl ions as the parameters.

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