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渤海海峡 4

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Calculation of diagonal section and cross-section bending capacity for strengthening RC structure using

Shouping SHANG , Fangyuan ZHOU , Wei LIU ,

《结构与土木工程前沿(英文)》 2009年 第3卷 第3期   页码 330-338 doi: 10.1007/s11709-009-0046-x

摘要: Because there is a great demand of reinforcement and retrofitting of aged structures nationwide, as well as the rapid development of innovative building materials, the adoption of strengthening RC structures using new inorganic materials has become possible. High-performance ferrocement laminate (HPFL) is an effective method of strengthening concrete structure. High-performance ferrocement laminate is a new type of inorganic material with the advantages such as high strength, small contraction, good bonding properties, etc. This paper introduces the formula of cross-section bending capacity for strengthening concrete beams with HPEL. A comparative analysis of experimental data, as well as the calculation of diagonal section bearing capacity of concrete members, is given.

关键词: RC beams     high-performance ferrocement laminate (HPFL)     inorganic material     reinforcement    

Improving retrieval precision of NO

Jinpeng YANG

《机械工程前沿(英文)》 2009年 第4卷 第1期   页码 92-96 doi: 10.1007/s11465-009-0001-5

摘要: The NO density error retrieved by the traditional method of differential optical absorption spectroscopy (DOAS) was analyzed. The technique for reducing the error is proposed and used to obtain the NO density of Chengdu through DOAS.

关键词: absorption structure     low-frequency structure     absorption cross-section     NO2 density    

relationship between plasma lipids and fasting plasma glucose in non-diabetic urban Chinese population: a cross-section

null

《医学前沿(英文)》 2014年 第8卷 第4期   页码 477-483 doi: 10.1007/s11684-014-0346-y

摘要:

The association between dyslipidemia and elevated fasting glucose in type 2 diabetes is well known. In non-diabetes, whether this association still exists, and whether dyslipidemia is an independent risk factor for high fasting plasma glucose (FPG) levels are not clear. This cross-sectional study recruited 3460 non-diabetic Chinese subjects (1027 men, and 2433 women, aged 35–75 years old) who participated in a health survey. Men and women were classified into tertiles by levels of plasma lipids respectively. In women, the prevalence of impaired fasting glucose (IFG) was decreased with increased HDL-C. A stepwise increase in HDL-C was associated with decreasing FPG levels (lowest tertiles, FPG: 5.376±0.018; middle tertiles, 5.324±0.018; highest tertiles, 5.276±0.018 mmol/L; P=0.001). Reversely, FPG levels increased from lowest tertiles to highest tertiles of LDL-C, TC, and TG. we found that women in the first tertile with lower HDL-C level had a 1.75-fold increase in risk of IFG compared with non-diabetic women in the third tertile with higher HDL-C level (OR: 1.75; 95% CI: 1.20--2.56). In men, no significant association was found. We took age, BMI, waist/hip ratio, education, smoking, alcohol drinking, and physical exercise as adjusted variables. In Chinese non-diabetic women, dyslipidemia is independently associated with high levels of FPG; TG, HDL-C, and LDL-C are predictors of IFG independent of BMI and waist/hip ratio.

关键词: dyslipidemia     plasma lipids     plasma fasting glucose     impaired fasting glucose     non-diabetes    

Development of MCBurn and its application in the analysis of SCWR physical characteristics

Ganglin YU , Kan WANG ,

《能源前沿(英文)》 2009年 第3卷 第3期   页码 348-352 doi: 10.1007/s11708-009-0031-z

摘要: The MCBurn, a coupled code system linking the Monte Carlo N-particle transport code(MCNP) and Oak Ridge isotope generation and depletion code (ORIGEN), can resolve the basic calculation problems in reactor physical design and analysis, such as criticality, power distribution, nuclide burn up, and neutron fluence. It has been verified in the pressurized water reactor (PWR) pin model, fast reactor (FR) burn up model, and boiling water reactor(BWR) assemble model with benchmarked results. In supercritical water reactor (SCWR) physical calculations, the calculation conditions such as the geometry, the neutron spectrum, and the fuel materials, etc., are more complex than those in traditional reactors, which is a great challenge to reactor physics calculation code. However, the MCBurn code is a possible solution. In this paper, several update functions of the MCBurn in new neutron cross-section lib, code interface, and neutron flux distribution were described. The application of the MCBurn in SCWR were verified on a supercritical water reactor assemble. The calculation results show that the MCBurn is accurate and adaptable in the SCWR calculation.

关键词: Monte Carlo method     MCBurn     SCWR     neutron cross-section lib    

Probability strength design of steam turbine blade and sensitivity analysis with respect to random parameters based on response surface method

DUAN Wei

《能源前沿(英文)》 2008年 第2卷 第1期   页码 107-115 doi: 10.1007/s11708-008-0018-1

摘要: Many stochastic parameters have an effect on the reliability of a steam turbine blade during practical operation. To improve the reliability of blade design, it is necessary to take these stochastic parameters into account. An equal cross-section blade is investigated and a finite element model is built parametrically. Geometrical parameters, material parameters and load parameters of the blade are considered as input random variables while the maximum deflection and maximum equivalent stress are output random variables. Analysis file of the blade is compiled by deterministic finite element method and applied to be loop file to create sample points. A quadratic polynomial with cross terms is chosen to regress these samples by step-forward regression method and employed as a surrogate of numerical solver to drastically reduce the number of solvers call. Then, Monte Carlo method is used to obtain the statistical characteristics and cumulative distribution function of the maximum deflection and maximum equivalent stress of the blade. Probability sensitivity analysis, which combines the slope of the gradient and the width of the scatter range of the random input variables, is applied to evaluate how much the output parameters are influenced by the random input parameters. The scatter plots of structural responses with respect to the random input variables are illustrated to analyze how to change the input random variables to improve the reliability of the blade. The results show that combination of the finite element method, the response surface method and Monte Carlo method is an ideal way for the reliability analysis and probability strength design of the blade.

关键词: Probability sensitivity     sensitivity analysis     number     cross-section     statistical    

基于医院中子照射器I型堆的MCNP中子截面库研制

王立鹏,江新标,赵柱民,朱养妮,陈立新,周永茂

《中国工程科学》 2012年 第14卷 第8期   页码 42-46

摘要:

利用NJOY程序制作了用于医院中子照射器I型堆(in-hospital neutron irradiator mark 1 reactor,IHNI-1)物理计算的MCNP中子截面库。着重考虑了反应堆运行温度范围内的温度点,制作了多温度点ACE(a compact ENDF)格式中子截面数据库。利用MCNP/4B自带库验证了自制库的正确性,利用ICSBEP(International Criticality Safety Benchmark Evalution Project,国际临界安全基准评价工程手册)基准题对结果进行了验证和反应性温度系数计算,分析了不同参数的影响作用。结果表明,所制作的截面库是正确的,能够用于IHNI-1反应堆物理设计计算。

关键词: NJOY     ENDF/B VII.0评价库     MCNP     ACE格式    

Introduction to the special section for ACMFMS 2010

Jinhao QIU

《机械工程前沿(英文)》 2011年 第6卷 第3期   页码 271-271 doi: 10.1007/s11465-011-0239-6

主支式排烟道中主烟道横截面尺寸的确定

黄锐,杨立中,范维澄

《中国工程科学》 2001年 第3卷 第11期   页码 45-48

摘要:

高层住宅主支式排烟道的主烟道中烟气流动可看作是一维定常垂直摩擦管流。通过计算管流流动相与颗粒相的物理参数沿管程分布情况,确定了颗粒相流动情况,进而判断烟气排放情况。这受到排烟系统高度、烟道管径,及材料组成等因素的影响,通过预设排烟系统高度并保证良好排放情况,求得主烟道管径应满足的条件。这使得布设排烟道时可以找到一个较好的横截面尺寸,既满足烟气排放条件,又节约修建材料。

关键词: 多相流     主支式厨房排烟道     计算模型    

Study on shear resistance of aluminum alloy I-section members

DONG Zhen, ZHANG Qilin

《结构与土木工程前沿(英文)》 2008年 第2卷 第1期   页码 79-86 doi: 10.1007/s11709-008-0007-9

摘要: The design method for the shear resistance of aluminum alloy I-section members is presented, taking into consideration of the post-buckling strength of webs and the restraint effect of flanges, and the practical design formulas are proposed. The deflection of aluminum alloy I-section members under concentrated load is simulated by using the finite element method, and several design theories are discussed. The relation of shear resistance to the maximum web displacement reflects that the web of aluminum alloy I-section member is under fewer shears buckling force, while the whole member has higher shear resistance. However, the traditional design method is not able to give the real shear resistance of aluminum alloy I-section members. The proposed design formulas for the shear resistance of aluminum alloy I-section members is used to calculate accurately the post-buckling resistance of webs and the shear resistance contribution of flanges. The results are in a great agreement with the test data of Hamoodi M J, Burt C A, Evans H R and the results from Eurocode9 formulas.

关键词: formulas     displacement     deflection     relation     I-section member    

Introduction to the special section on the 12

Zhen-Min CHENG

《化学科学与工程前沿(英文)》 2009年 第3卷 第1期   页码 1-1 doi: 10.1007/s11705-009-0003-1

Torsional behavior of triangular web profile (TRIWP) steel section by experimental study

Fatimah DE’NAN,Hazwani HASAN,Mohd Hanim OSMAN,Sariffudin SAAD

《结构与土木工程前沿(英文)》 2016年 第10卷 第4期   页码 409-419 doi: 10.1007/s11709-016-0358-6

摘要: A triangular web profile (TriWP) is a modified section where the flanges are connected to a web plate of triangular profile. This study examined the torsional behavior of TriWP steel sections and compared to that of the flat web (FW) steel sections. Three types of specimen sizes were used: 180 mm × 75 mm × 5 mm × 2 mm, 200 mm × 100 mm × 8 mm × 6 mm, and 200 mm × 100 mm × 6 mm × 5 mm. All the specimens were loaded vertically until the maximum load was achieved and then the load was released. For both types of specimens, it was observed that the torsional rotation for bigger size [200 mm × 100 mm × 8 mm × 6 mm] were smaller than that of smaller size [180 mm × 75 mm × 5 mm × 2 mm] of the specimens. At the maximum torsional loading, the experimental result was compared to the theoretical calculation. The comparison showed that the percentage difference ranged from 1.10% to 16.80%. From the graph of torsional load versus rotational angle, the torsional rotation for all TriWP steel sections were smaller than that of the FW steel section under the same torsional loading i.e., 0.2 kNm and 1 kNm. The range between FW and TriWP were 3.74 to 71.83 at 0.2 kNm while 14.5 to 75.1 at 1.0 kNm. The findings were shown that the TriWP steel sections had better resistance against torsion in comparison to FW steel section.

关键词: corrugated web     i-beam     non uniform steel section     torsion resistance     torsion angle     triangular web profile steel section    

Introduction to the Special Section on Biomedical Devices for Personal Health Applications

I-Ming CHEN

《机械工程前沿(英文)》 2011年 第6卷 第1期   页码 1-2 doi: 10.1007/s11465-011-0210-6

Introduction to the special section on the Symposium on Computational Fluid Dynamics and Molecular Simulation

Tianwei TAN, Peiyong QIN,

《化学科学与工程前沿(英文)》 2010年 第4卷 第3期   页码 241-241 doi: 10.1007/s11705-009-0285-3

Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

《结构与土木工程前沿(英文)》 2022年 第16卷 第7期   页码 843-857 doi: 10.1007/s11709-022-0834-0

摘要: In this study, finite element (FE) analysis is utilized to investigate the shear capacity of reinforced concrete (RC) beams strengthened with embedded through-section (ETS) bars. Effects of critical variables on the beam shear strength, including the compressive strength of concrete, stiffness ratio between ETS bars and steel stirrups, and use of ETS strengthening system alone, are parametrically investigated. A promising method based on the bond mechanism between ETS strengthening and concrete is then proposed for predicting the shear resistance forces of the strengthened beams. An expression for the maximum bond stress of the ETS bars to concrete is developed. This new expression eliminates the difficulty in the search and selection of appropriate bond parameters from adhesion tests. The results obtained from the FE models and analytical models are validated by comparison with those measured from the experiments. Consequently, the model proposed in this study demonstrates better performance and more accuracy for prediction of the beam shear-carrying capacity than those of existing models. The results obtained from this study can also serve researchers and engineers in selection of the proper shear strength models for design of ETS-strengthened RC beams.

关键词: embedded through-section     strengthening     fiber-reinforced polymer     finite element     shear strength model     bond mechanism    

Behavior of concrete-filled double skin steel tubular columns with octagon section under axial compression

YANG Junjie, PENG Guojun, XU Hanyong

《结构与土木工程前沿(英文)》 2008年 第2卷 第3期   页码 205-210 doi: 10.1007/s11709-008-0035-5

摘要: Based on some conclusions of two kinds of concrete-filled double skin steel tube (CFDSST) members with circular or square sections, a new kind of CFDSST with octagonal section, where the outer tube has an octagonal section and the inner tube has a circular section, is proposed in this paper. Behaviors of the CFDSST members with octagon section subjected to axial compression are investigated, and some curves of load-strain of steel tubes and confined concrete and the bearing capacity of members are obtained. It is indicated that the bearing capacity of the columns with octagonal section is larger than that with square section and is smaller than that with circular section, and the bearing capacity of members is related to the ratio of the straight side to the bevelled one. Based on the proper stress-strain relationship, a couple of numerical analyses are made using the finite element software named ANSYS. Finally, a simplified formula is proposed in the paper, and the numerical results agree well with the experimental results and the mathematical solutions. The results are valuable for engineers.

关键词: mathematical     numerical     compression     stress-strain relationship     straight    

标题 作者 时间 类型 操作

Calculation of diagonal section and cross-section bending capacity for strengthening RC structure using

Shouping SHANG , Fangyuan ZHOU , Wei LIU ,

期刊论文

Improving retrieval precision of NO

Jinpeng YANG

期刊论文

relationship between plasma lipids and fasting plasma glucose in non-diabetic urban Chinese population: a cross-section

null

期刊论文

Development of MCBurn and its application in the analysis of SCWR physical characteristics

Ganglin YU , Kan WANG ,

期刊论文

Probability strength design of steam turbine blade and sensitivity analysis with respect to random parameters based on response surface method

DUAN Wei

期刊论文

基于医院中子照射器I型堆的MCNP中子截面库研制

王立鹏,江新标,赵柱民,朱养妮,陈立新,周永茂

期刊论文

Introduction to the special section for ACMFMS 2010

Jinhao QIU

期刊论文

主支式排烟道中主烟道横截面尺寸的确定

黄锐,杨立中,范维澄

期刊论文

Study on shear resistance of aluminum alloy I-section members

DONG Zhen, ZHANG Qilin

期刊论文

Introduction to the special section on the 12

Zhen-Min CHENG

期刊论文

Torsional behavior of triangular web profile (TRIWP) steel section by experimental study

Fatimah DE’NAN,Hazwani HASAN,Mohd Hanim OSMAN,Sariffudin SAAD

期刊论文

Introduction to the Special Section on Biomedical Devices for Personal Health Applications

I-Ming CHEN

期刊论文

Introduction to the special section on the Symposium on Computational Fluid Dynamics and Molecular Simulation

Tianwei TAN, Peiyong QIN,

期刊论文

Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

期刊论文

Behavior of concrete-filled double skin steel tubular columns with octagon section under axial compression

YANG Junjie, PENG Guojun, XU Hanyong

期刊论文