Experimental Study on, Small Span to Depth Ratio Coupling Beams withNew Reinforcement mewt Scheme and Design Method

Coupling beams combining two coupled walls are the primarily energy dissipating elements in the coupled walls and play a key role in improving ductility. It is proved by the test outcome at home and abroad that the shear failure happening early cannot be     

STATICAL SHEAR STRENGTH ON COUPLING BEAMS OF REINFORCED CONCRETE

On the basis of a statical test of 16 specimens of coupling beams in shear walls,which consist of 10 specimens with ordinary rinforcement and 6 specimens with composite reinforce-ment,the statical behaviors of the coupling beams with two different types of reinforcement arestudied.It is concluded that the flexural strength 0f the beam should be multiplied by a reductionfactor when the span-depth ratio is less than 2,and the shear strength is not influenced by the span-depth ratio and may be obtained with unified calculation formula.     

Finite Element Simulate Analysis of Small Span-to Depth Ratio Coupling Beams with Special Reiforcement

Test investigations show that the reinforcement scheme with adding diagonal and rhombic bars to traditional reinforcement in the foundation is an ideal way, for the seismic performance of small span-to depth ratio coupling beams with this scheme is better than that of traditional reinforcement. Because the regions in the small aspect ratio coupling beam belong to D-regions, in which the Bernoulli hypothesis of plane strain distribution is invalid, the traditional bending theory can not be used. This paper simulates the coupling beam through non-linear finite element analysis program, and contrasts the analysis result of the bar's stress distribution with test result. The contrast results confirm that it is a valid way to analyse the bar's stress distribution in this coupling beam through non-linear finite element analysis program.     

Experiment and Simulation of Bearing Behavior for Diagonally Reinforced Coupling Beams with Small Length to Height Ratio

Diagonally reinforced coupling beams were proved to have good seismic behaviors by six low frequency cyclic loading experiments with different length to height ratios varying in 1.0, 1.5, 2.0 and 2.5. Based on mechanism analysis of diagonally reinforced coupling beams with the conditions of L/h(length to height ratio)≤1.5 and1.5<L/h≤2.5, a statically indeterminate strut and tie model was proposed to simulate behaviors of diagonally reinforced coupling beams with L/h≤1.5. And 16 formula, such as geometric equation, deformation compatibility equation, physical equation and equilibrium equation were established. Compared with the experiment results, it was found that the model was appropriate for the behavior simulation of diagonally reinforced coupling beams with L/h≤1.5 .     

Calibration of Nonlinear Dynamical Analysis for RC Frame-wall Structure with Slender Coupling Beams Considering Stiffness Reduction

Two 16-storey frame-wall structures with slender coupling beams in regions of Intensity 8(0.2 g),with and without considering the stiffness reduction of the coupling beams,were designed.Nonlinear dynamic response analyses of two typical frame-wall structures subjected to several ground motions were carried out.The analyses were based on the quasi-tridimensional program for nonlinear dynamic response analysis TS-EPA.The analyses led to the following conclusions: Under rare earthquake actions,the coupling beams in framewall structures yield first.This shows that the coupling beam in frame-wall structures is the member at the forefront of earthquake resistance.Comparison of the analytic results of two couples with and without considering the stiffness reduction of the coupling beam found that,in view of the dynamic response to and the requirement for ductility under rare earthquake motions,reducing stiffness causes a minor unfavorable influence on the dynamic response of frame-wall structures.     

RESEARCH ON WALL BEAM OF PARTIALLY PRESTRESSED CONCRETE

In this Paper,multistoryed buildings of brick and RC floor slab construction are put up on frame beam of 12. 6 m partially prestressed concrete.A test and analysis is carried out on site.It provides a new scheme for multisto-reyed and highrise buildings with beam of transitive force and transfer floor.     

A Study of Laminated Beam used for Heavy Steel Beam

This paper promotes a method of using laminated beam as heavy beam to improve middle Plate stability and overcome the shortcomings of heavy beam in manufacture and installation. With a practical example, the design method and analysis for the beam body and its connectors are put up.     

THE APPLICATION OF ELECTRO-OPTIC EFFECT TO HOLOGRAPHY

This paper uses LN-Class LiNbO3 crystal to make a laser beamsplitter and a phase modulator, In the Paper devices and results have been given, and deviation factor between experiment and theory have been analyzed. This device is over a wide range of adjusting. Its reapeatability is good, and the devive is simple andconvenient.     

Linear and Nonlinear Finite Element Analysis of a Degenerated 3D Beam Element

In order to solve the calculation problems of the curved beam, an arbitrary cross section beam and composite beam, a degenerated 3D fiber beam element is derived based on the degenerated theory. According to the basic assumption of plane section, the 3D displacement field equations of an arbitrary point are discretized in terms of nodal displacements, which take account of shear deformation effect. Furthermore, the tangent stiffness matrix formulation, which takes geometric and material nonlinearity into account, is deduced using Update Lagrange formulation. A finite element method program has been developed, and several typical examples are tested to demonstrate the effectiveness, accuracy and versatility of this beam element.     

甘草水肥耦合效应初探

针对新疆人工种植甘草产量低、水肥利用效率不高的生产状况,以水肥耦合为中心,通过二次回归通用旋转组合设计方案,建立回归模型并进行效应解析,结果表明：在灌水量、施肥量充足情况下,甘草产量与灌水量、施肥量呈抛物线关系;水肥耦合效应明显,具有明显增产效果,在灌水量为：255.56mm、施肥量为：900.00kg/hm2时,甘草产量达到13226.48kg/hm2,但过多的水肥投入并不有利于甘草增产,在灌水量超过273.3mm或施肥超过900.00kg/hm2时,甘产产量呈下降趋势     

Mechanical Behavior of Bolt weld Joints between Square Concrete filled Tubular Column and Reduced Beam Section

With the actual three dimension element, the nonlinear finite element analytic models were established for bolt weld joints between square concrete filled tubular (CFT) column and reduced beam section with inner separates, considering geometric large deformation, materials nonlinear and contact nonlinear. Compared with finite element model and experimental model, it was in good agreement in principle. And the characteristics of load displacement(P Δ) curves, the stresses distribution of beam, the dissipating energy ability and destruction form were made with numerical analysis for bearing behavior of bolt weld joints between square CFT column and reduced beam section . It was shown that the initial stiffness of joint with reduced beam section was close to that of non reduced beam section joint. The bearing capacities of joints with reduced beam section were a little bit lower than those of non reduced beam section joint. The plastic hinge in the joint with reduced beam section moved to the reduced beam region. The studied joints displayed a better ductility, energy dissipation and good seismic behavior.     

Perturbation Solution to Large DeflectionProblem of Cantilever Beams

The large deflection problem of cantilever beams is studied by means of pseudolinear approach and the result is compared with that by algorithm of nonlinear governing equation. It indicates that large deflection problem solved by pseudolinear analysis can lead to simple and precise results.     

Tests on Cracking Behaviors of Reinforced Concrete Beams Underlong- Term Sulphate Attack

In this paper,six reinforced concrete beams dismounted from their worksites under long-term sulphate attack are studied.The authors analyzed the working properties and cracking moment of the reinforced concrete beams under long-term sulphate attack,suggesting that the reinforced concrete beams under long-term sulphate attack may have more favorable cracking-resistant behavior in some circumstances.     

Construction Technology for Bid Construction Part B of Yangtze River Bridge in Jiangyin City

In this paper, the advanced construction technology and site management applied in bid construction part B of Yangtze River bridge in Jiangyin was presented in detail. This bridge is the largest span bridge in China, where the advanced technology applied is: 3-d coordinate control surveying in bridge tower, small powder for artificial pile, over-form and climb form in construction of tower column, temperature control for casting mass concrete. It is of great value for reference to large bridge building.     

AREA-VECTOR METHOD CALCULATJJNG THE DISPLACEMENTS OF BEAMS AND FRAMES

A new method with which to calculat the displacements of beams and frames is presented. The areas of tending moment diagram of beam or frame and the slope at the origin of the elastic curve are treated as some rotatable vectors with this method. Angular displacement and in-line displacement can be calculated by using the projection and moment of these vectors. This method can be used to calculate displacement of the bar and the bar syttem ( including three dimensional forms. ) , which made from linear or ncnlinear elastic materials. The cross section of the bar is changeable.     

The Coupling Mechanism Study of Aluminate Coupling Agent on the Surface of Flyash Microspheres

The monolayer model about aluminate coupling agent on the surface of flysah microsphares is proposed. The chemincal coupling mechanism on the boundary of aluminate coupling agent with flyash microspheres is verified by the methods of IR and EMS analyses.     

Composite Steel- concrete Frame Beam with Reinforced Negative Bending Regions

Considering the large negative bending moment at the end of frame beam and low tensile strength of concrete,a new composite steel-concrete frame beam(CSCFB),reinforced by a T shape steel beam at the negative bending regions,was brought forward.Through two full-scale of single-layer CSCFB frame models experiment,the load-displacement curves of CSCFB and strain distribution at cross section were obtained.Compared with the ordinary composite beam,the T shape reinforcing section can enhance the beam stiffness effectively,and make it distribute reasonably.The segment flexural rigidity method is presented and validated.     

氮离子束辐照对烟草种子发芽率的影响

用不同剂量的氮离子束辐照不同烟草品种的干种子，对种子发芽率进行了测定。结果表明，不同品种间、不同处理剂量间差异均达显著水平；品种与剂量互作效应间差异也达显著水平。     

绿豆乳发酵饮料的研制

以绿豆为原料制成绿豆乳,并添加乳酸菌发酵制作绿豆乳发酵饮料。对绿豆乳的浓度、发酵条件及产品稳定性等涉及产品质量的因素进了研究,找到了最佳工艺条件,研制出营养丰富,口感良好,具有绿豆和乳酸菌双重保健功能的饮料。