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Multi-Quality Properties Capability Analysis for Prestressing Strand of Prestressed Concrete

厦门大学学报（自然科学版） 2002年第S1期41卷 111-页

作者： Wen Pei Sung Kuen Suan Chen cheer germ go Department of Landscape Design and Management Department of Industrial Engineering and Management National ChinyiInstitu te of TechnologyDepartment of Civil Engineering National Chung Hsing University Taiping Taichung Taiwan 41111 ChinaTaichungTaiwan 40227 China

Prestressed concrete structures are main conformati on for the construction of high way bridges. The quality of prestressed concrete s tructures is mainly affected by the tensile strength of prestressing strand. In order to attain the purpose of economic design and long life span of prestressin g strand, the less relaxation property of strand type is suitable for constructi on and usage. Thus, the research and development of prestressing strand is requi red to reach the goals of high tensile strength and low relaxation. To ensure th e required quality of prestressing strand, the strand pull test and long period relaxation test are two important items for the quality assurance. There are thr ee specific items of the tensile strength test are belong to larger-the-better quality type. The quality type of smaller-the-better is for the long period r elaxation test. However, many existing methods are able to measure process capab ility for product with single quality characteristic and cannot be applied to mo st products with multiple properties. Thus, the indices of C pu and C pl, for larger-the-better and smaller-the-better quality type respec tively proposed by Kane, are quoted and combined to propose a new index to evalu ate the quality of multiple characteristics of prestressing strand in this paper . Then, the principle of statistics is used to derive the one-to-one mathemati cal relationship of this new index and ratio of tallied. Finally, the procedure and criteria to evaluate the quality of prestressing strand is proposed. This in tegrated multi-quality property capability analysis model can be used to evalua te the multi-process capabilities and provide continuous improvement on manufac turing process of prestressing strand.

关键词： index of multi-quality properties entire produc t prestressing strand

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Investigation of newly developed added damping and stiffness device with low yield strength steel

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2004年第3期5卷 77-85页

作者： SHIH Ming-hsiang go cheer-germ Department of Construction Engineering National Kaoshiang First University of Science and TechnologyDepartment of Civil Engineering National Chung Hsing University Taiwan 824 ChinaTaiwan 40227 China

Energy dissipators, isolated-resistant and specific structural forms for earthquake resistance are popular topics in the research to improve shock-resistance. In this work, experimental methods were used to investigate the property of low yield strength steel. Carbon content in LYS material is lower than that in other steels; the ultimate stress is three times the yield stress. The ultimate elongation rate is about 62% and the ductility is 23 times that of A36 steel. In order to overcome some defects of ordinary use metallic dampers, the mechanical characteristic of low yield strength steel is used to develop added damping and stiffness for rhombic steel plate absorber. Test of the energy dissipation behavior for this newly de-veloped device indicated that LYS could stably dissipate or absorb the input energy of earthquake. Then, the analytical model for the hysteretic behavior of this new device is proposed. Comparison of experimental data and numerical simulation results showed that this analytical model is suitable for simulating the hysteretic energy behavior of this new device.

关键词： Seismic shock absorbance elements Capability of seismic resistance Hysteretic behavior of rhombic steel plate Nonlinear analytical model

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Finite element modeling for analysis of cracked cylindrical pipes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1373-1379页

作者： SUNG Wen-pei go cheer-germ SHIH Ming-hsiang Department of Landscape Design and Management National Chin-Yi University of TechnologyTaipingTaichung 41111TaiwanChina Department of Civil Engineering National Chung Hsing UniversityTaichung 40227TaiwanChina Department of Construction Engineering National Kaohsiung First University of Science and TechnologyKaohsiung 811TaiwanChina

The characteristic properties of shell element with similar shapes are used to generate a so-called super element for the analysis of the crack problems for cylindrical pressure vessels. The formulation is processed by matrix condensation without the involvement of special treatment. This method can deal with various singularity problems and it also presents excellent results to crack problems for cylindrical shell. Especially,the knowledge of the kind of singular order is not necessary in super element generation; it is very economical in terms of computer memory and programming. This method also exhibits versatility to solve the problem of kinked crack at cylindrical shell.

关键词： Crack shell Super-element Pressure vessel

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The critical loading for lateral buckling of continuous welded rail

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第8期6卷 878-885页

作者： SUNG Wen-pei SHIH Ming-hsiang LIN Cheng-I go cheer germ Department of Landscape Design and Management National Chin-Yi Institute of Technology Taiwan 41111 China Department of Construction Engineering National Kaoshiang First University of Science and Technology Taiwan 824 China Department of Fire Science. Wu-Feng Institute of Technology Ming-Hsiung Chiayi Taiwan 621 China Department of Civil Engineering National Chung Hsing University Taiwan 40227 China

The most significant differences between continuous welded rails （CWRs） and general split-type connectors are axial compression in the longitudinal direction, buckling stability and other issues generated under the influence of thermal effect. Under thermal effect, a dynamical behavior similar to that of a beam fixed on two sides occurs in the central locked area of the welded rail, as there is axial compression but no possibility of sliding. Continuous welded rails do not contract or expand, and are supported by the dynamical system made up of ballasts and rail clips. The rail-support system mentioned above has the features of non-uniform material distribution and uncertainty of construction quality. Due to these facts, the dynamics method based on the linear elastic hypothesis cannot correctly evaluate the rail＇s buckling conditions. This study is aimed at applying Finite Difference Method （FDM） and Monte Carlo Random Normal Variables Method to the analysis of welded rail＇s buckling behavior during the train＇s acceleration and deceleration, under thermal effect and uncertain factors of ballast and rail clips. The analysis result showed that buckling occurs under the combined effect of thermal effect and the train＇s deceleration force co-effect and the variance ratio of ballast and rail clips is over 0.85, or under the combined effect of thermal effect and the train＇s acceleration force when the ariance ratio is over 0.88.

关键词： Thermal effect Finite Difference Method Monte Carlo Method Buckling load

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