检索结果-南通市图书馆

Frontiers of Structural and Civil Engineering 2020年第3期14卷 675-689页

作者： Iman FATTAHI Hamid Reza MIRDAMADI Hamid ABDOLLAHI Department of Mechanical Engineering Isfahan University of TechnologyIsfahan ***Iran

Analyzing static and dynamic problems including composite structures has been of high significance in research efforts and industrial *** this article,equivalent single layer approach is utilized for dynamic finite element procedures of 3D composite beam as the building block of numerous composite *** this model,both displacement and strain fields are decomposed into cross-sectional and longitudinal components,called consistent geometric decomposition ***,the model is discretized using finite clement *** local coordinate systems and a global one are defined to decouple mechanical degrees of ***,from the viewpoint of consistent geometric decomposition theorem,the transformation and element mass matrices for those systems are introduced here for the first *** same decomposition idea can be used for developing element stiffiness ***,comprehensive validations are conducted for the theory against experimental and numerical results in two case studies and for various conditions.

关键词： composite beam dynamic finite element degrees of freedom coupling experimental validation numerical validation

Natural frequencies analysis of a composite beam consisting of Euler-Bernoulli and Timoshenko beam segments alternately

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2017年第3期24卷 625-636页

作者： PENG Li-ping College of Mechanical and Electrical Engineering Hohai University Changzhou 213022 China School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221116 China School of Mechatronic Engineering China University of Mining and Technology Xuzhou 221116 China

Present investigation is concerned with the free vibration property of a beam with periodically variable *** the special geometry characteristic,the beam was modelled as the combination of long equal-length uniform Euler-Bernoulli beam segments and short equal-length uniform Timoshenko beam segments *** using continuity conditions,the hybrid beam unit(ETE-B) consisting of Euler-Bernoulli beam,Timoshenko beam and Euler-Bernoulli beam in sequence was *** boundary conditions of pinned-pinned,clamped-clamped and clamped-free were considered to obtain the natural *** examples of the equal-length composite beam with 1,2 and 3 ETE-B units were presented and compared with the equal-length and equal-cross-section Euler-Bernoulli beam,*** work demonstrates that natural frequencies of the composite beam are larger than those of the Euler-Bernoulli beam,which in practice,is the interpretation that the inner-welded plate can strengthen a hollow *** this work,comparisons with the finite element calculation were presented to validate the ETE-B model.

关键词： natural frequency Euler-bernoulli beam Timoshenko beam hybrid beam unit composite beam

Vibration Serviceability of Large-Span Steel–Concrete composite beam with Precast Hollow Core Slabs Under Walking Impact

在线全文

学校读者我要写书评

暂无评论

Engineering 2022年第12期19卷 93-104页

作者： Jiepeng Liu Shu Huang Jiang Li Y.Frank Chen School of Civil Engineering&Key Laboratory of New Technology for Construction of Cities in Mountain Area Ministry of EducationChongqing UniversityChongqing 400045China Central-South Architectural Design Institute Co. Ltd.Wuhan 430071China Department of Civil Engineering The Pennsylvania State UniversityPA 17057USA

A large-span steel–concrete composite beam with precast hollow core slabs(CBHCSs)is a relatively new floor structure that can be applied to various long-span ***,human-induced vibrations may present serviceability issues in such *** alleviate vibrations,both the walking forces excited by humans and the associated floor responses must be *** this study,150 load–time histories of walking,excited by 25 test participants,are obtained using a force measuring *** dynamic loading factors and phase angles in the Fourier series functions for one-step walking are ***,walking tests are performed on seven CBHCS specimens to capture the essential dynamic properties of mode shapes,natural frequencies,damping ratios,and acceleration time *** CBHCS floor system generally exhibits a high frequency(>10 Hz)and low damping(damping ratiobeam type,contact time,and human weight are ***,analytical expressions derived for the fundamental frequency and peak acceleration agree well with the experimental results and are hence proposed for practical use.

关键词： composite beam Hollow core slab Walking force Floor vibration Mode shape

CALCULATION ANALYSIS OF SHEARING SLIP FOR STEEL-CONCRETE composite beam UNDER CONCENTRATED LOAD

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2005年第6期26卷 735-740页

作者：刘寒冰刘文会张云龙 College of Traffic Jilin University

The strain difference of steel and concrete under vertical concentrated load was analyzed on the basis of elastic theory, and was compared with ideal solution of steel and concrete under vertical uniform load. The results indicate that the computing formula concluded from the paper is believable. The practical structure usually bears concentrated load, so it can be used in the practical engineering.

关键词： composite beam concentrated load partial-interaction shearing slip

Low Velocity Impact Response Analysis of Shape Memory Alloy Reinforced composite beam

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2005年第3期20卷 70-73页

作者：吴永东 Department of Mechanics Huazhong University of Science and Technology

The low velocity impact responses of shape memory alloy （ SMA ） reinforced composite beams were analyzed by employing the finite element method. The finite element dynamic equntion was solved by the Newmark direct integration method, the impact contact force was determined asing the Hertzian contact law, and the influence of SMA .fibers on stiffiwss matrix is studied. Numerical results show that the SMA fibers can effectively improve the low velocity impact response property of composite beam.

关键词： shape memory alloy composite beam low velocity impact FEM

Fatigue tests of composite beam by steel fiber reinforced self-stressing concrete in the hogging bending

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai University(English Edition) 2010年第6期14卷 430-436页

作者：胡铁明黄承逵梁振宇陈小锋 School of Architectural and Civil Engineering Shenyang University State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

Through the experiments of 7 T-section composite beams, steel fiber reinforced self-stressing concrete （SFRSC） as the composite beam in the composite layer was studied under the hogging bending. The tests simulated composite layer tensile strain under the hogging bending of inverted loading composite beams, giving the relationship under the different fatigue stress ratios between fatigue cycles and steel bar’s stress range, crack width, stiffness loss and damage, etc., in composite layer. This article established fatigue life equation, and analyzed SFRSC reinforced mechanism to crack width and stiffness loss. The results show that SFRSC as the composite beam concrete has excellent properties of crack resistance and tensile, can reinforce the fatigue crack width and stiffness loss of composite beams, and improve the durability and in normal use of composite beams in the hogging bending zone.

关键词： steel fiber reinforced self-stressing concrete (SFRSC) composite beam hogging bending fatigue

Seismic Behavior of Confined RC Columncomposite beam Joints

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2014年第3期20卷 174-181页

作者：张谦于庆荣管俊峰吴智敏 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology School of Civil Engineering Tianjin University College of Civil and Transportation Engineering North China University of Water Resources and Electric Power

In order to evaluate the seismic behavior of confined RC column-composite beam joints, five interior joints were tested under low cyclic reversed load. The weakening extent of flanges, the number of studs, and whether to reinforce weakened flanges were used as parameters in designing these five joints. Failure characteristics, hysteretic curves, skeleton curves, ductility, energy dissipation, strength degradation, and stiffness degradation were analyzed. The test results revealed that the steel beam flanges in the joints were equivalent to the tie rod. Weakened flanges resulted in poor seismic behavior; however, the seismic behavior could be improved by increasing studs and reinforcing weakened flanges. The joint steel plate hoops, equivalent to stirrups, did not yield when the maximum load was reached, but yielded when the failure load was reached for the joints with shear failure. Increasing stud-type joints and reinforcing flange-type joints ensured good seismic behavior and met project requirements. Based on the experimental results, the failure mechanism of the joints was discussed, and the shear capacity equations of the joints was presented.

关键词： seismic behavior joint confined RC column composite beam

Experimental Research on Shear Behavior of Reinforced Concrete composite beams Under Uniformly Distributed Load

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 1998年第4期13卷 467-476页

作者： ZHAO Shunbo Ass. Prof., North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450045, P. R. China. N. China Inst. Water Conserv./H.P. Zhengzhou 450045 China

An experimental program was carried out to study the shear behavior of the reinforced concrete composite beam (RCCB) subjected to two-phase uniformly distributed load. A total of 12 reinforced concrete composite beams were tested: 10 of them were the RCCB subjected to two-phase uniformly distributed load, the other 2 were the comparative reinforced concrete beams cast at the same time as the RCCB subjected to one-phase uniformly distributed load. The interface of precast unit and recast concrete was natural and rough. The test range of the main composite factors: the ratio of precast section depth to composite section depth was from 0.35 to 0.65, the ratio of first-phase load moment to precast section ultimate bearing moment was from 0.25 to 0.65. Based on the test results, the stresses of the longitudinal reinforcements and stirrups, the load-bearing properties of the interface, the crack state and the failure characteristics of the RCCB under uniformly distributed load are discussed. The effects of the stirrups, the concrete strength and the composite factors on the shear resistance of the RCCB are analyzed, and the method for evaluating the shear resistance of the RCCB is proposed.

关键词： reinforced concrete composite beam shear resistance composite factor mechanism of failure

Fatigue properties of special kind of reinforced concrete composite beams

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2010年第1期17卷 142-149页

作者：胡铁明黄承逵陈小锋 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology School of Architectural and Civil Engineering Shenyang University

The special reinforced concrete composite beam consists of a steel fiber reinforced self-stressing concrete composite layer and a reinforced concrete T-beam, and constructional bars are set up at their bonding interface. Fatigue properties of the composite beam under the action of negative moment were experimentally studied. Through inverted loading mode the load-beating state of a composite beam was simulated under the action of negative moment. With the ratios of constructional bars being 0, 0.082% and 0.164% respectively as parameters, the effects of constructional bars on the properties of composite beam, such as fatigue life, crack propagation, rigidity loss as well as damage behavior of bonding interface, were studied. The mechanism of the constructional bars on the fatigue properties of the composite beams and the restriction mechanism of crack widths and rigidity loss were analyzed. The test results show that the constructional bars can enhance the shear resistance of the bonding interface between composite layer and old concrete beam and restrict expanding of steel fiber reinforced self-stressing concrete, which are beneficial to synergistic action of composite layer and old concrete beam, to reducing the stress amplitude of bars and the crack width of composite layer, and to increasing the durability and fatigue life of the composite beam.

关键词： steel fiber reinforced self-stressing concrete composite beam constructional bar bonding interface fatigue

Delamination damage detection of laminated composite beams using air-coupled ultrasonic transducers

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第7期56卷 1269-1279页

作者： LIU ZengHua YU HongTao HE CunFu WU Bin College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology

Air-coupled ultrasonic transducers are used to generate and receive Lamb waves in quasi-isotropic laminated composite beams for delamination detection. The influence of incident angle on the excited mode is studied. Numerical calculation and experimental results show that a pure Lamb wave mode can be generated if the transmitting transducer is oriented at a specific angle, and the receiving transducer can either be oriented to detect the same mode as that generated by the transmitter or to detect another mode generated by mode conversion at a defect. A three-dimensional finite element model is created to predict the interaction of Lamb waves with delamination, and some unique mechanisms of interaction between A0 mode Lamb waves and delamination are revealed in detail. The experimental results obtained on laminated composite beam using air-coupled ultrasonic transducers are well in accordance with finite element simulation results. Research results show that air-coupled ultrasonic guided waves can be used for delamination damage detection effectively in laminated composite beams.

关键词： delamination detection composite beam Lamb wave mode air-coupled ultrasonic transducer three-dimensional finite element simulation