钢桁架混凝土梁试验研究

The present paper studies the applicability of composite concrete beams to building and bridge structures. The ultimate flexural and shearing strength, the flexural stiffness, and the width of cracks of a series of composite concrete beams are analysed an     

柱面弹簧拉伸弹力的协变性

验证了拉伸弹力的协变性：完全弹性体的胡克拉伸定律具有罗伦兹变换的形式不变性,而柱面拉伸弹簧弹力公式却与常规力的罗伦兹变换相抵触。通过把劲度系数扩展为矩阵形式,拉伸弹簧的形变与弹力在罗伦兹变换中得到了统一。在严格定义四维“形变事件”后,弹簧的形变一弹力方程被表达成完全协变的四维矢量方程。     

Design Problems of Internal Bracing and Composite Soil Nailing Wall in Foundation Pits under Binary Geological Conditions

Combined with the design practice in foundation excavation engineering,the problems for combined supporting from inner supports and composite soil nailing wall under binary geological conditions,including soil layers and rock stratum with weak intercalation in range of excavation depth,are analyzed.These problems mainly include the following: calculation model of earthen pressure,the local bearing capacity of foundations below steel pipe piles,stiffness coordination at the junction of rigid and flexible supports,internal bracing stability influencd by restrained condition of upright post,etc.Problems of concern for design of similar foundation pit supports are pointed out,and measures for solving these problems are proposed.All these can provide references for similar projects.     

履带式行走机构粘弹性悬挂机构的刚度-阻尼特性分析

针对传统履带式拖拉机行走系易受剧烈振动冲击的问题,开发出一种新型的粘弹性悬挂机构。用复刚度理论,建立起该机构的运动微分方程,对其刚度-阻尼特性进行了分析。依据能量转换的观点,分析了机构中粘弹性阻尼材料的静、动态对振动能转换率的影响。对开发后的应用在240kW履带式拖拉机粘弹性悬挂机构上进行了刚度曲线设计和性能分析,并在电液伺服试验机上对实际产品进行了性能试验     

基于键合图理论的动力稳定装置轮轨间动态特性分析

考虑动力稳定装置的轮轨非线性接触、轮轨间的间隙传动、夹钳油缸和水平油缸的等效刚度建立了动力稳定装置动态特性键合图模型.使用分段函数表达式实现了轮轨间的间隙传动.针对不同夹持力对于能量的传递效率与作业效果进行了深入分析与探究,确定了所需最小的水平油缸的推力.     

外加盐对凉粉草胶溶液的耐盐性和分子链刚性度的影响

在有盐环境下贮藏和加工凉粉草胶必须了解其多糖分子对盐的敏感性,该文绘制了凉粉草胶多糖在不同离子强度NaCl、KCl、MgCl₂和CaCl₂溶液中的Huggins'图,分别计算其分子链在这4种离子溶液中的耐盐度S、链刚性度B等值,结果发现：凉粉草胶多糖在4种离子溶液中,其耐盐性由强到弱的顺序为:K⁺>Na⁺>Mg⁺⁺>Ca⁺⁺,其分子链的构象在4种离子溶液中由柔到刚的顺序为:K⁺>Na⁺>Mg⁺⁺>Ca⁺⁺,这说明凉粉草胶多糖适合在KCl溶液中贮藏和加工。与其他多糖分子链在NaCl溶液中的B值比较后发现,凉粉草胶多糖的分子链构象较海藻酸钠要刚,较黄原胶要柔,这说明凉粉草胶比黄原胶更适合在NaCl溶液中贮藏和加工。     

On mechanical behavior of traditional timber shear wall in Taiwan II: simplified calculation and experimental verification

In the previous report of this ongoing study, results of an extensive field survey were collated and a theoretical model was proposed to predict the mechanical behavior of timber shear walls of traditional design in Taiwan. The initial objective of the present report was to propose a simplified calculation method for estimating the initial stiffness and yield strength of traditional timber shear walls. Based on the results of the field survey, a total of 15 full-scale specimens were tested to verify the theoretical model and simplified calculation proposed previously. Good agreement was found from comparison of analytical and experimental results. The results of this study show that the friction behavior between board units and beams plays the major role in resisting the lateral force applied on the timber shear wall, followed by the resistance supplied by embedment. The resistance provided by bamboo nails is minor due to the small section. Another trend found was that for set dimensions of a timber shear wall, the board width can be increased to obtain higher stiffness and strength of the shear wall.     

Mechanical properties of natural fiber composites produced using dynamic sheet former

ABSTRACT

Composites formed from wood fibers and man-made cellulosic fibers in PLA (polylactic acid) matrix, manufactured using sheet forming technique and hot pressing, are studied. The composites have very low density (due to high porosity) and rather good elastic modulus and tensile strength. As expected, these properties for the four types of wood fiber composites studied here improve with increasing weight fraction of fibers, even if porosity is also increasing. On the contrary, for man-made cellulosic fiber composites with circular fiber cross-section, the increasing fiber weight fraction (accompanied by increasing void content) has detrimental effect on stiffness and strength. The differences in behavior are discussed attributing them to fiber/ fiber interaction in wood fiber composites which does not happen in man-made fiber composites, and by rather weak fiber/matrix interface for man-made fibers leading to macro-crack formation in large porosity regions.     

Transient Response of the Rotor System with Nonlinear Flexible Supports

The effect of the rotor system with nonlinear flexible supports passing through the resonance area is studied,when the system is at the transient process of starting or breaking.The stiffness with hard nonlinear feature can cause the critical speed and the maximum amplitude of the transient processes increase.It is no benefit for the rotor system to pass through the resonance area rapidly.The effect of the transient acceleration on the maximum amplitude of the transient processes has also been researched in the paper.At last the rotor system with slow changing stiffness has been analyzed.     

Axial Force Stiffness Interaction in Seismic Analysis of RC Double Column Bridges

Earthquake induced dynamic axial force in reinforced concrete (RC) bridge bent columns will not only change the yield strength of the columns but also change their stiffness, which is seldom considered by the common lumped plasticity line model. Based on the fiber element model results that taking into account the influence of dynamic axial force on strength and stiffness simultaneously, the axial force stiffness interaction effect on the seismic responses of RC double column bridges was analyzed. The results show that, axial force stiffness interaction has a large effect on the seismic responses of the double column bridge in the elastic range, and it does not alter the ultimate capacity of the columns. Since the stiffness of the columns under compression and tension dynamic axial forces offset each other, the global displacement of bridge bent with equal columns is relatively unaffected by the axial force stiffness interaction, however, the differences of the column member forces are manifest. For the short column controls the global stiffness, the axial force stiffness interaction has significant influences on both the global displacement and member force responses. The influences become larger as the irregularity of the bridge bent increases, so the interaction between axial force and member stiffness should be sufficiently considered in seismic analyses.