The Construction Technology Control Method for Large Scale Concrete Counterforce Wall Prestressed with Unbonded Tendons

2014 ◽  
Vol 638-640 ◽  
pp. 1586-1590
Author(s):  
Jin Kun Sun ◽  
Jin Liu ◽  
Bing Mei Zhou ◽  
Tao Lv
Keyword(s):  
Large Volume ◽  
Prestressed Concrete ◽  
Large Scale ◽  
Control Method ◽  
Construction Technology ◽  
Unbonded Tendons ◽  
Preparation Stage ◽  
Fixed End ◽  
Technology Control ◽  
Prestressed Reinforcement

Based on the characteristics of the large scale concrete counterforce wall design burdening heavy, the nonstructural section wide, belonging to the large volume, and the construction difficulty and precision being required high, apply the Construction technology of unbonded prestressed concrete. According to the aspects of material the preparation stage of construction, on-site construction stage marching into the arena, the blanking of prestressed with unbonded tendons, the manufacture of fixed end, the install of prestressed reinforcement, the pouring of the large volume, the tension of prestressed, ect. Raising the points of niche targeting technology control of construction for the similar construction provides with the beneficial experiential learning.

Research on Precast Segment Assembling Bridge Technology in Short-Line Matching Method

2012 ◽  
Vol 256-259 ◽  
pp. 1652-1657
Author(s):  
Hong Zhang ◽  
Min Wang ◽  
Yong Tao Zhang
Keyword(s):  
Prestressed Concrete ◽  
Large Scale ◽  
Development Trend ◽  
Concrete Bridge ◽  
Construction Technology ◽  
Bridge Construction ◽  
Matching Method ◽  
Short Line ◽  
Under Construction ◽  
Bridge Technology

Targeted at key technological difficulties of pre-stressed concrete bridge with precast segment assembling in short-line matching method, combined with the as-built projects and those under construction, this essay introduces systematic segmental precast assembly externally prestressed concrete construction technology in short-line matching method, and the developed serial complete equipments set, thus realizing development trend of factory-orientation, large-scale, mechanization, standardization of modern bridge construction.

Research on Stress Increase of Unbonded Tendons at Ultimate in Prestressed Concrete Continuous Beams

2012 ◽  
Vol 166-169 ◽  
pp. 1554-1557
Author(s):  
Xiao Dong Wang ◽  
Wen Zhong Zheng ◽  
Ying Wang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beams ◽  
Simulation Analysis ◽  
Analysis Method ◽  
Stress Increase ◽  
Continuous Beams ◽  
Unbonded Tendons ◽  
Index Ratio ◽  
Prestressed Reinforcement ◽  
Rational Evaluation

Rational evaluation for stress increase of unbonded tendon at ultimate is the basis to exactly compute flexural load bearing capacity of unbonded prestressed concrete beams. Moment-curvature nonlinear analysis method is adopted to compile programs for calculating stress increase at ultimate in unbonded prestressed continuous beams. The precision of the method is proved by comparing results of 16 experimental two-span unbonded prestressed continuous beams to the prediction value of stress increase at ultimate. Based on the simulation analysis, law of the influence of some basic factors to stress increase at ultimate in unbonded tendons in continuous beams is obtained, such as non-prestressed reinforcement index, prestressed reinforcement index, ratio of span to depth and loading type. Then formulas for calculating stress increase at ultimate in unbonded tendons in prestressed concrete continuous beams were established.

Research on Post-Tensioned Prestressed Concrete Construction Technology in Construction Engineering

2013 ◽  
Vol 700 ◽  
pp. 221-224
Author(s):  
Shu Yue Liu ◽  
Wei Ling Wang
Keyword(s):  
Prestressed Concrete ◽  
Construction Technology ◽  
Concrete Construction ◽  
Construction Engineering ◽  
Channel Reservation ◽  
Reinforcement Material ◽  
Prestressed Reinforcement ◽  
Post Tensioned

Study of bonded post-tensioned prestressed concrete construction technology, from materials, equipment, channel reservation, prestressed reinforcement material installation, concrete pouring, the prestressed tendons tension and grouting of anchor seal is described from the aspects of the construction of the link, the specific operation steps, summarizes the method of construction, improve the following prestressed concrete construction understanding.

The Key Technology of Short-Line Matching Method in Precast Segment Assembling of Externally Prestressed Concrete Bridges

2014 ◽  
Vol 1065-1069 ◽  
pp. 912-918
Author(s):  
Min Wang ◽  
Yong Tao Zhang ◽  
Wei Tian
Keyword(s):  
Prestressed Concrete ◽  
Large Scale ◽  
Development Trend ◽  
Concrete Bridges ◽  
Construction Technology ◽  
Matching Method ◽  
Key Technology ◽  
Prestressed Concrete Bridges ◽  
Short Line ◽  
Under Construction

Targeted at key technological difficulties of pre-stressed concrete bridge with precast segment assembling in short-line matching method, combined with the as-built projects and those under construction, this essay introduces systematic segmental precast assembly externally prestressed concrete construction technology in short-line matching method, and the developed serial complete equipments set, thus realizing development trend of factory-orientation, large-scale, mechanization, standardization of modern bridge construction.

Fixed-End Moment Equations for Continuous Prestressed Concrete Beams

PCI Journal ◽  
1966 ◽  
Vol 11 (1) ◽  
pp. 75-94
Author(s):  
Duryl M. Bailey ◽  
Phil M. Ferguson
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beams ◽  
Moment Equations ◽  
Fixed End

Research on a New Type of Lithium Battery String Equalization and Management System

2011 ◽  
Vol 383-390 ◽  
pp. 1470-1476
Author(s):  
Hao Wang ◽  
Ding Guo Shao ◽  
Lu Xu
Keyword(s):  
Lithium Batteries ◽  
Management System ◽  
Lithium Battery ◽  
Large Scale ◽  
Control Method ◽  
Balance Control ◽  
Industrial Applications ◽  
Control Technique ◽  
New Type ◽  
Management Functions

Lithium battery has been employed widely in many industrial applications. Parameter mismatches between lithium batteries along a series string is the critical limits of the large-scale applications in high power situation. Maintaining equalization between batteries is the key technique in lithium batteries application. This paper summarizes normal equalization techniques and proposed a new type of lithium Battery Equalization and Management System (BEMS) employing the isolated DC-DC converter structure. The system is integrated both equalization functions and management functions by using distributed 3-level controlled structure and digital control technique. With this control method the flexibility of the balance control strategy and the compatibility for different battery strings are both improved dramatically. The experimental results show optimizing equalization, efficiency and the battery string life span has been extended.

scholarly journals Control method for the stable operation of distributed inverters following the introduction of large-scale renewable energy to a remote island grid

Clean Energy ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 196-207
Author(s):  
Shoichi Sato ◽  
Yasuhiro Noro
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Control Method ◽  
Synchronous Generator ◽  
Stable Operation ◽  
Battery Energy Storage Systems ◽  
Simulation Results ◽  
Battery Energy ◽  
Systems Simulation ◽  
Different Characteristics

Abstract The introduction of large-scale renewable energy requires a control system that can operate multiple distributed inverters in a stable way. This study proposes an inverter control method that uses information corresponding to the inertia of the synchronous generator to coordinate the operation of battery energy storage systems. Simulation results for a system with multiple inverters applying the control method are presented. Various faults such as line-to-line short circuits and three-phase line-to-ground faults were simulated. Two fault points with different characteristics were compared. The voltage, frequency and active power quickly returned to their steady-state values after the fault was eliminated. From the obtained simulation results, it was verified that our control method can be operated stably against various faults.

Synchronous Issue of IR-Based Large Scale Volume Localization System

2014 ◽  
Vol 496-500 ◽  
pp. 1643-1647
Author(s):  
Ying Feng Wu ◽  
Gang Yan Li
Keyword(s):  
Standard Deviation ◽  
Mobile Robot ◽  
Large Volume ◽  
Large Scale ◽  
Image Acquisition ◽  
Mean Value ◽  
Network Synchronization ◽  
Localization System ◽  
Localization Performance ◽  
The Mean

IR-based large scale volume localization system (LSVLS) can localize the mobile robot working in large volume, which is constituted referring to the MSCMS-II. Hundreds cameras in LSVLS must be connected to the control station (PC) through network. Synchronization of cameras which are mounted on different control stations is significant, because the image acquisition of the target must be synchronous to ensure that the target is localized precisely. Software synchronization method is adopted to ensure the synchronization of camera. The mean value of standard deviation of eight cameras mounted on two workstations is 12.53ms, the localization performance of LSVLS is enhanced.

A Novel Real-Time Thermal Analysis and Layer Time Control Framework for Large Scale Additive Manufacturing

2020 ◽  
Author(s):  
Sepehr Fathizadan ◽  
Feng Ju ◽  
Kyle Rowe ◽  
Alex Fiechter ◽  
Nils Hofmann
Keyword(s):  
Additive Manufacturing ◽  
Surface Temperature ◽  
Real Time ◽  
Large Scale ◽  
Production Efficiency ◽  
Control Method ◽  
Data Extraction ◽  
Critical Role ◽  
Imaging Data ◽  
Time Data

Abstract Production efficiency and product quality need to be addressed simultaneously to ensure the reliability of large scale additive manufacturing. Specifically, print surface temperature plays a critical role in determining the quality characteristics of the product. Moreover, heat transfer via conduction as a result of spatial correlation between locations on the surface of large and complex geometries necessitates the employment of more robust methodologies to extract and monitor the data. In this paper, we propose a framework for real-time data extraction from thermal images as well as a novel method for controlling layer time during the printing process. A FLIR™ thermal camera captures and stores the stream of images from the print surface temperature while the Thermwood Large Scale Additive Manufacturing (LSAM™) machine is printing components. A set of digital image processing tasks were performed to extract the thermal data. Separate regression models based on real-time thermal imaging data are built on each location on the surface to predict the associated temperatures. Subsequently, a control method is proposed to find the best time for printing the next layer given the predictions. Finally, several scenarios based on the cooling dynamics of surface structure were defined and analyzed, and the results were compared to the current fixed layer time policy. It was concluded that the proposed method can significantly increase the efficiency by reducing the overall printing time while preserving the quality.

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