Reliability Analysis of Prestressed Steel Structure in Regards to Temperature Action

2010 ◽  
Vol 97-101 ◽  
pp. 4415-4419 ◽  
Author(s):  
Zhan Sheng Liu ◽  
Zhi Hua Chen
Keyword(s):  
Expansion Coefficient ◽  
Limit State ◽  
Steel Structure ◽  
Element Model ◽  
State Equation ◽  
Linear Expansion Coefficient ◽  
String Structure ◽  
Expansion Coefficients ◽  
Prestressed Steel Structure ◽  
The Impact

In order to study the impact of various cables expansion coefficients on the reliability of the prestressed steel structure, a finite element model of the beam string structure and a limit state equation controlled by applicability have been established. The Monte Carlo method based on Latin hypercube sample is adopted and APDL language is applied to write a corresponding program, thereby carrying out reliability calculation and analysis to the model; the system reliability and parameters sensitivity of the beam string structure under different cable expansion coefficients and temperature conditions are provided. The results indicate that the change of cable expansion coefficient has a great impact on the reliability of the structure; therefore, it is necessary to give precise linear expansion coefficient for different cables.

The Effect of Cable Material Characteristics on Suspendome

2010 ◽  
Vol 156-157 ◽  
pp. 1251-1255 ◽  
Author(s):  
Zhi Hua Chen ◽  
Guo Jun Sun ◽  
Zhan Sheng Liu
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Low Temperature ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Steel Structure ◽  
Linear Expansion Coefficient ◽  
Maximum Displacement ◽  
Material Characteristics ◽  
Prestressed Steel Structure

Cable is the key component in the prestressed steel structure. In order to study the effect of cable elastic modulus and expansion coefficient on the prestressed steel structure, Suspendome of Tianbao Center was taken as the research object and APDL language is applied to write a corresponding program, thereby carrying out analysis to the model; The results indicate that the change of cable expansion coefficient and cable elastic modulus have a different effect on the performance of the suspendome: at high temperature, the effect of the expansion coefficient of hoop cable and radial cable is larger on the maximum displacement; at low temperature, the effect of the elastic modulus of hoop cable is larger on the support constrained force. Therefore, it is necessary to give precise linear expansion coefficient and elastic modulus for different cables.

Reliability Analysis of Beam String Structure Considering the Failure of Key Components

2011 ◽  
Vol 243-249 ◽  
pp. 351-354
Author(s):  
Zhan Sheng Liu ◽  
Rui Long Xu
Keyword(s):  
System Reliability ◽  
Safety Assessment ◽  
Steel Structure ◽  
Structure Reliability ◽  
Reliability Calculation ◽  
Surface Method ◽  
String Structure ◽  
Prestressed Steel Structure ◽  
The Impact ◽  
Central Composite

There have been few researches on the reliability of prestressed steel structure, especially the study on the reliability considering the failure of key components. In order to study the impact of the component failure on the structure reliability, the response surface method based on central composite design is adopted and APDL language is applied to write a corresponding program, thereby carrying out reliability calculation and analysis to the model. The system reliability and parameters sensitivity of the beam string structure under different failure of components are provided. The results indicate that the impact of cable failure on the reliability is large, but it is weak by the failure of brace rod. The results may serve as a reference for the health monitoring and safety assessment of the prestressed steel structure.

Impact Analysis of Different Cable Types on Saddle-Shaped Cable-Net in Construction Process

2012 ◽  
Vol 479-481 ◽  
pp. 190-193
Author(s):  
Zhan Sheng Liu ◽  
Ran Zhang
Keyword(s):  
Mechanical Properties ◽  
Impact Analysis ◽  
Steel Wire ◽  
Steel Structure ◽  
Element Model ◽  
Wire Rope ◽  
Construction Process ◽  
New Type ◽  
Prestressed Steel Structure ◽  
The Impact

Cable is widely used in the actual project of prestressed steel structure for its mechanical properties can be fully used. Saddle-shaped cable net is a new type of large-span prestressed structure, but there is little study on the impact of different cable types on the mechanical properties of saddle-shaped cable net during the construction. In order to meet the thought of integration of design and construction, a finite element model of saddle-shaped cable net has been established. The four types of cables such as semi-parallel steel tendon cable, steel wire rope cable, steel strand cable and full-locked coil rope are chosen. The impact on mechanical properties of the structure was analyzed by different cable types.

Reliability Analysis of Saddle-Shaped Cable Structure

2015 ◽  
Vol 744-746 ◽  
pp. 226-229
Author(s):  
Bin Li ◽  
Zhan Sheng Liu ◽  
Jian He ◽  
Rui Long Xu
Keyword(s):  
Reliability Analysis ◽  
Failure Modes ◽  
Steel Structure ◽  
Element Model ◽  
Cable Structure ◽  
Mechanics Performance ◽  
New Type ◽  
New Form ◽  
Prestressed Steel Structure ◽  
The Finite Element Model

Saddle-shaped cable structure is a new form of prestressed structure. Its reliability need to be analyzed for a new type structure. According to the different failure modes, the finite element model of prestressed steel structure is established. By using APDL language, the program is created. Finally, the reliability index of the model for different failure modes is got by reliability analysis. The results Provides reference basis for mechanics performance evaluation of prestressed structure.

scholarly journals Scientometric Analysis for Mechanical Performance of Broken-Line Long-Span Steel Structure in Construction Considering Geometric Nonlinearity

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1229
Author(s):  
Gang Yao ◽  
Chaoyu Wu ◽  
Yang Yang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Steel Structure ◽  
Element Model ◽  
Structural Quality ◽  
Scientometric Analysis ◽  
Construction Process ◽  
Large Span ◽  
Long Span ◽  
The Impact

A structure does not reach a stable state during the construction process, and hence its structural reliability is low. In order to ensure the safety of the construction process and final structural quality, it is necessary to analyze the safety and structural mechanical properties of large-span space steel structures during the construction process. Based on the engineering background of the polyline symmetrical large-span steel structure construction process, this research established a finite element model of the large-span steel structure on an ANSYS platform. The correctness of the model was verified by comparing the measured frequency of the large-span steel structure with the frequency calculated in the finite element model. Based on the life-death element method, the internal force and deformation response characteristics of the large-span steel structure in the construction process were analyzed, and the different effects of the on-time completion and step-by-step construction on the performance of the broken-line large-span steel structure were compared and analyzed. The study found that the long-span steel truss structure is more sensitive to the construction process, and the final forming state is greatly affected by the construction process. The construction sequence is different, and the structure process and size and distribution of the final stress and deformation are also different. The analysis result of the construction process is closer to that of the actual project. Therefore, appropriate construction paths should be used in the construction process to reduce the impact of path effects on structural performance. It is recommended to pay more attention to the displacement and stress response of the truss when it encounters similar a symmetrical long-span steel structure truss in-place of the forming construction.

Reliability Analysis of Cable Structure Based on Parametric Design Language

2013 ◽  
Vol 838-841 ◽  
pp. 328-333
Author(s):  
Zhan Cang Li ◽  
Zhan Sheng Liu
Keyword(s):  
Reliability Analysis ◽  
Failure Modes ◽  
Parametric Design ◽  
Steel Structure ◽  
Element Model ◽  
Cable Structure ◽  
Mechanics Performance ◽  
New Type ◽  
Prestressed Steel Structure ◽  
The Finite Element Model

Saddle-shaped cable structure is a new form of prestressed structure. Its reliability need to be analyzed for a new type structure. According to the different failure modes, the finite element model of prestressed steel structure is established. By using APDL language, the program is created. Finally, the reliability index of the model for different failure modes is got by reliability analysis. The results Provides reference basis for mechanics performance evaluation of prestressed structure.

Finite Element Analysis of Leakage about Metallic Sealing Ring Used in Aircraft Engine

2014 ◽  
Vol 971-973 ◽  
pp. 885-888
Author(s):  
Yun Wang ◽  
Xi Chen ◽  
Xiang Yu Ding
Keyword(s):  
Finite Element ◽  
Aircraft Engine ◽  
Element Model ◽  
Momentum Equation ◽  
State Equation ◽  
Working Environment ◽  
Element Analysis ◽  
Gas Leakage ◽  
Sealing Ring ◽  
The Impact

based on process equation, momentum equation, state equation and continuity equation, building ax symmetric finite element model of sealing ring used in aero engine, combined with characters of flowing gas in small gap deduce the formula of gas leakage rate, and discuss the impact of working environment for its sealing capability. The result show, as the compression ratio increased, the leakage was correspondingly reduced.

scholarly journals Structural Integrity of Fixed Offshore Platforms by Incorporating Wave-in-Deck

2021 ◽  
Vol 9 (9) ◽  
pp. 1027
Author(s):  
Nurul Uyun Azman ◽  
Mohd Khairi Abu Husain ◽  
Noor Irza Mohd Zaki ◽  
Ezanizam Mat Soom ◽  
Nurul Azizah Mukhlas ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Limit State ◽  
Pushover Analysis ◽  
Offshore Structures ◽  
State Equation ◽  
Air Gap ◽  
Wave Crest ◽  
Offshore Platforms ◽  
Offshore Structure ◽  
The Impact

The structural integrity of offshore platforms is affected by degradation issues such as subsidence. Subsidence involves large settlement areas, and it is one of the phenomena that may be experienced by offshore platforms throughout their lives. Compaction of the reservoir is caused by pressure reduction, which results in vertical movement of soils from the reservoir to the mud line. The impact of subsidence on platforms will lead to a gradually reduced wave crest to deck air gap (insufficient air gap) and cause wave-in-deck. The wave-in-deck load can cause significant damage to deck structures, and it may cause the collapse of the entire platform. This study aims to investigate the impact of wave-in-deck load on structure response for fixed offshore structure. The conventional run of pushover analysis only considers the 100-year design crest height for the ultimate collapse. The wave height at collapse is calculated using a limit state equation for the probabilistic model that may give a different result. It is crucial to ensure that the reserve strength ratio (RSR) is not overly estimated, hence giving a false impression of the value. This study is performed to quantify the wave-in-deck load effects based on the revised RSR. As part of the analysis, the Ultimate Strength for Offshore Structures (USFOS) software and wave-in-deck calculation recommended by the International Organization for Standardization (ISO) as practised in the industry is adopted to complete the study. As expected, the new revised RSR with the inclusion of wave-in-deck load is lower and, hence, increases the probability of failure (POF) of the platform. The accuracy and effectiveness of this method will assist the industry, especially operators, for decision making and, more specifically, in outlining the action items as part of their business risk management.

scholarly journals The Effect of Different Additives on the Hydration and Gelation Properties of Composite Dental Gypsum

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 117
Author(s):  
Liang Ma ◽  
Qianting Xie ◽  
Amutenya Evelina ◽  
Wenjun Long ◽  
Cunfa Ma ◽  
...  
Keyword(s):  
Expansion Coefficient ◽  
Linear Expansion ◽  
Fine Powder ◽  
High Strength ◽  
Experimental Methods ◽  
Linear Expansion Coefficient ◽  
Cross Sectional ◽  
Clinical Preparation ◽  
Before And After ◽  
Expansion Coefficients

Dental mold gypsum materials require fine powder, appropriate liquidity, fast curing, and easy-to-perform clinical operations. They require low linear expansion coefficient and high strength, reflecting the master model and facilitating demolding. In this article, the suitable accelerators and reinforcing agents were selected as additives to modify dental gypsum. The main experimental methods used were to compare the trends of linear expansion coefficients of several commercially available dental gypsum products over 72 h and to observe the cross-sectional microstructure of cured bodies before and after dental gypsum modification using scanning electron microscopy. By adjusting the application of additives, the linear expansion coefficient of dental gypsum decreased from 0.26% to 0.06%, while the flexural strength increased from 6.7 MPa to 7.4 MPa at 2 h. Formulated samples showed good stability and gelation properties with linear expansion completed within 12 h. It is indicated that the performance of dental gypsum materials can be improved by adding additives and nanomaterials, which provided a good reference for clinical preparation of high-precision dental prosthesis.

Investigation on the shaft voltage generation of large synchronous turboalternators

2020 ◽  
Vol 39 (5) ◽  
pp. 1145-1156
Author(s):  
Kevin Darques ◽  
Abdelmounaïm Tounzi ◽  
Yvonnick Le-menach ◽  
Karim Beddek
Keyword(s):  
Finite Element ◽  
Design Methodology ◽  
Short Circuit ◽  
Element Model ◽  
Stator Winding ◽  
Content Type ◽  
Voltage Generation ◽  
The Impact ◽  
Investigation Process ◽  
Circulating Currents

Purpose This paper aims to go deeper on the analysis of the shaft voltage of large turbogenerators. The main interest of this study is the investigation process developed. Design/methodology/approach The analysis of the shaft voltage because of several defects is based on a two-dimensional (2D) finite element modeling. This 2D finite element model is used to determine the shaft voltage because of eccentricities or rotor short-circuit. Findings Dynamic eccentricities and rotor short circuit do not have an inherent impact on the shaft voltage. Circulating currents in the stator winding because of defects impact the shaft voltage. Originality/value The original value of this paper is the investigation process developed. This study proposes to quantify the impact of a smooth stator and then to explore the contribution of the real stator winding on the shaft voltage.

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