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A numerical study of prestressed high strength steel tubular members

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 10-22页

作者： Michaela GKANTOU Marios THEOFANOUS Charalampos BANIOTOPOULOS Department of Civil Engineering Liverpool John Moores UniversityLiverpool L33AFUK Department of Civil Engineering University of BirminghamBirmingham B152TTUK

The structural behavior of prestressed high strength steel(HSS)tubular members is investigated through the execution of advanced finite element *** models are developed and validated against published experimental data on HSS tubular members subjected to different levels of initial prestress and loaded either in tension or *** effect of the presence or absence of grouting on the strength and ductility of the members is also *** numerically replicate the structural response recorded in the tests,some key modeling features including the employed numerical solver,the adopted material models and the element types warrant careful *** developing of the finite element models,the numerically generated ultimate loads,the corresponding failure modes and the full load-deformation curves are compared to the experimental ones,indicating a successful *** anticipated,prestressing enhances the load-bearing capacity for the tensile members,whereas it is detrimental for the compressive ones.A series of parametric studies is performed to assess the influence of key factors on the structural response of prestressed HSS members and the obtained results are *** guidance for tensile and compressive prestressed tubular members is also provided.

关键词： finite element prestressing tubular members grout high strength steel

Effect of Different Connectors on Concrete Composite Box-Girders with Corrugated Steel Webs

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Journal of Harbin Institute of Technology(New Series) 2018年第2期25卷 73-84页

作者： Yanqiu Lu Beijing Capital Highway Development Group Co. Ltd. Dept of Civil Engineering Tsinghua University

In order to resolve affecting of Different Shear Connectors(the perfobond leisten(PBL) shear connectors and stud shear connectors) on the M echanical Properties of Prestressed Concrete Composite BoxGirders with Corrugated Steel Webs,Some mechanical properties of Prestressed Concrete Composite BoxGirder with Corrugated Steel Webs were researched by conducting experiments on two specimens with PBL shear connectors and stud shear connectors relating to ultimate bearing capacity,the flexural stiffness,crack resistance properties and the efficiency of prestressing being introduced to the girder,etc. The test results show ed that,relative to the stud shear connectors,PBL shear connectors can greatly improve some structural performance qualities of prestressed concrete composite box-girders with corrugated steel webs,such as the ultimate bearing capacity,the flexural stiffness and the crack resistance property,but when the efficiency of prestressing is introduced into the girder,the PBL shear connectors do not perform as well as stud shear connectors.

关键词： studs PBL ultimate bearing capacity efficiency of prestressing introduced flexural stiffness crack resistance property

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预应力张拉网壳的几何稳定性分析

安徽建筑工业学院学报（自然科学版） 1995年第Z1期3卷 5-10页

作者：张伟林安徽建筑工业学院

介绍一种新颖实用的张拉网壳，这种网壳由柔性缆索和刚性杆件组成，按照“拉力连续、压力间断”的思想设计，以最大限度地利用工程材料．本文讨论了这类网壳的几何造型和几何形状的稳定性条件，举例说明了张拉网壳内预应力的确定方法．

关键词： tensegric shell geometric stability prestressing

ANALYSIS AND MEASUREMENT ONRESIDUAL STRESS OF ARAMIDALUMINIUMLAMINATE

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Chinese Journal of Aeronautics 1994年第4期7卷 283-288页

作者： Li Hongyun Hu Hongiun Zheng Rulqi(Beijing institute of Aeronautical Materials, Beijing, China, 100095)

Residual stresses of the ordinarily cured and pre-stressed unidirectionallaminate are analyzed quantitatively. In order to examine the analyzing formulations,strain gages were embedded in the uni-directional aramid aluminium laminates (ordi-narily cured and pre-stressed) to determine the residual stresses in the aluminiumlayers. The calculated residual stresses are in good agreement with the experimental val-ues in the longitudinal direction. Therefore, the work in this paper can be used to calcu-late, determine and design the longitudinal residual stresses according to the manufac-ture and application demands.

关键词： aramid fiber aluminium alloys laminates residual stress prestressing

Study on the Design Criteria for Prestressed Concrete Pavements

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Journal of Southeast University(English Edition) 2000年第1期16卷 80-88页

作者：孙宝俊 RogerK.Hawkins 吕志涛东南大学土木工程学院南京210096 诺丁汉Trent大学

With a concrete pavement slab prestressed, its load carrying capacity can be significantly increased; thus a thinner slab may be used for the same loading. prestressing modify the structural behavior of the pavement slab and there is a greater resistance to impact, vibration and overloading. This paper discusses the major design considerations necessary in the successful construction of prestressed concrete pavements and presents a design procedure developed to predict the compressive stress due to prestressing in the pavements at early stage, during service and after cracking. Variation in the approach for repetitive and nonrepetitive loads is clearly distinguished. Check on the recovery after cracking for overloading in prestressed pavements is also needed. Finally, a design example is illustrated the application of the approach developed.

关键词： design criteria prestressed concrete pavements design procedure prestressing recovery after cracking

Comparison of Shrinkage, Creep and Elastic Shortening of VMA and Powder Type Self-Compacting Concrete and Normal Vibrated Concrete

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Open Journal of Civil Engineering 2017年第1期7卷 130-140页

作者： Yuvaraj L. Bhirud Keshav K. Sangle Structural Engineering Department Veermata Jijabai Technological Institute Mumbai India

Self-compacting concrete (SCC) is flowing in nature and hence viscosity modified agent (VMA) or higher amount of binder is used for stability of mix. The mix proportion of SCC is also different from normal vibrated concrete (NC). This modifies the properties of concrete at fresh as well as at hardened state. Three mixes, one VMA type SCC, one powder type SCC and one NC, are considered with identical water to binder ratio. Properties at fresh state such as workability and segregation resistance and at hardened stage such as compressive strength, elastic modulus, shrinkage, creep and elastic shortening are determined and compared. Powder type SCC shows superior properties at fresh stage. Also compressive strength of powder type SCC is found better than that of VMA SCC and NC. Observations show more shrinkage, elastic shortening and creep for powder type SCC as compared with VMA SCC and NC.

关键词： Self-Compacting Concrete Elastic Modulus Shrinkage Creep Elastic Shortening prestressing

Parametric Analysis on the Optimal Dimensions of Steel Sleeve in Swaging Type Anchorage for CFRP Tendon

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Engineering（科研） 2013年第11期5卷 902-908页

作者： Jae Yoon Kang Jong Sup Park Woo Tai Jung Moon Seoung Kum Structural Engineering Research Division Korea Institute of Construction Technology Goyang Korea

This paper presents the parametric analysis conducted to derive the optimal dimensions of the steel sleeve necessary to secure the bond performance of the swaging type anchorage for CFRP tendon with diameter of 5 mm. To that goal, finite element analysis is performed on the parameters determining the dimensions of the sleeve like the thickness and inner diameters of the sleeve. The results show that a constant swaging pressure of about 450 MPa on the mean is distributed in the sleeve when the thickness ratio of the stress relief zone to the effective swaging zone of the sleeve is larger than 1.1 and that the swaging pressure tends to reduce linearly as much as this thickness ratio becomes smaller than 1.1. The pressure varies within a range of about 30% according to the change in the inner diameter of the sleeve whereas varies within a range less than 10% according to the change in the inner diameter when the thickness ratio is larger than 1.1. Finally, the optimal dimensions of the steel tube sleeve enabling to secure an anchor force larger than the rupture strength of the CFRP tendon with diameter of 5 mm are determined based upon the results of the parametric analysis.

关键词： CFRP Tendon prestressing Swaging Type Anchorage Swaging Sleeve

Behavior Characteristics of Bonded Type Anchorage for CFRP Tendon

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Engineering（科研） 2013年第11期5卷 909-918页

作者： Jong Sup Park Woo Tai Jung Jae Yoon Kang Moon Seoung Kum Structural Engineering Research Division Korea Institute of Construction Technology Goyang Korea

This paper examines the shear stress and displacement occurring in CFRP tendons through finite element analysis on the parameters influencing the anchoring performance to evaluate the behavioral characteristics of the bonded type anchorage for CFRP tendon. The selected parameters are the inner angle of the anchorage barrel, the friction between the barrel and filling material, and the elastic modulus of the filling material. The difference in the behavioral characteristics is examined for each parameter. In view of the analytic results, the shear stress developed in the CFRP tendon reduces with larger inner angle of the barrel and lower elastic modulus of the filling material. However, such combination provokes also the increase of the relative displacement of the CFRP tendon. Especially, slip failure may occur due to the lack of the confining force necessary for the anchorage due to the sudden loss of vertical force brought by the wedge force. The experimental results relative to barrel inner angles of 2° and 4° showed that the specimen with an angle of 2° preserved its anchoring performance up to tensile failure whereas the specimen with an angle of 4°?failed in developing its maximum anchoring performance due to slip failure.

关键词： CFRP Tendon prestressing Anchorage Wedge

Study Progress of FRP Rebars in Concrete Structures

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Science Foundation in China 2005年第1期13卷 20-22页

作者： Xue Weichen Tongji University Shanghai 200092

Fiber reinforced plastics (i. e. FRP) rebars are one kind of high-performance composite materi- als used in concrete structures of civil engineering. Compared with ordinary steel rebars, FRP rebars have the characteristics of high tensile strength, an- tisepsis, light weight, low elastics modulus and low shear strength, et al. At present time, FRP re- bars have been studied and applied in Europe, America and Japan Since 2000, in the Fund of NS- FC, we systematically carried out experimental and theoretical studies on FRP rebars The progress of our research is briefly introduced in this paper.

关键词： FRP rebar Bond strength Concrete beam prestressing FRP grid rebar