斜拉桥纵向设置粘滞阻尼器参数分析

采用Maxwell阻尼模型模拟了粘滞阻尼器的滞回耗能特性。通过对设置粘滞阻尼器斜拉桥纵向非线性地震反应的分析，讨论了粘滞阻尼器各参数对结构地震响应的影响，并通过计算证实了粘滞阻尼器具有良好的消能减振效果。     

高烈度区连续梁桥的减震设计方法研究

本文以高烈度区的某三跨连续梁桥为例，分别采用基础隔震和消能减震两种措施进行结构的减震分析；针对隔震结构减震效果好但主梁位移过大的特点，提出了在采用铅芯橡胶隔震支座的同时设置粘滞阻尼器的减震方案，其非线性时程分析结果表明，该方案能有效地降低结构的地震反应，可供工程实践参考。     

On the nonlinear dynamics of the boundary layer of intense atmospheric vortex

The paper describes a stationary model of the boundary layer of a large-scale vortex. The model takes into account two types of nonlinearities: (1) advection of the momentum and centrifugal accelerations, that is related to large values of the Rossby number; (2) a nonlinear turbulent friction on the lower boundary (generally speaking, not only quadratic, but also more complicated). Nevertheless, the model may be studied analytically. This approach allows discovery and analysis of several universal regularities, which are not revealed by numerical modeling. The model provides the actual values for the speed of the surface wind and the angle of cross-isobar surface flow in the tropical cyclones.     

Effect of rod friction on vane shear tests in very soft organic harbour mud

Very soft organic harbour mud is increasingly used as a filling and construction material in harbour construction and reorganization. The undrained shear strength of such soft sediments is the critical geotechnical soil parameter with regard to any specific construction design. Field and laboratory vane shear testing is a standard method to quickly determine this important parameter. So far, the effect of rod friction on vane shear tests in very soft organic soils is unclear. In this study we present results from laboratory experiments on harbour mud from a construction site in northern Germany. Relations among vane and rod geometry, penetration depth, water content, rod friction and undrained shear strength are derived. Based on these relations the influence of rod friction on vane shear test results is investigated. The results indicate that field and laboratory vane shear test measurements may be significantly influenced by rod friction. Methods are proposed to correct for the rod influence, which is shown to increase with rising water contents.     

Physics of basic motions in asymmetric continuum

We consider the advantages of a formalism based on concept of the asymmetric continuum and we present some equivalence theorems relating it to the asymmetric elasticity and to micropolar and micromorphic theories as founded by Nowacki, Cosserats and Eringen. We consider the basic processes in an asymmetric continuum which could be reduced to the point basic motions/deformations. The co-action of spin and shear motions is assumed to play the main role in fracturing process, while the constitutive relation between the antisymmetric stresses and rotations replaces the friction constitutive law.     

某铁路大桥钻孔灌注桩工程性状浅析

通过对某铁路特大桥钻孔灌注桩单桩竖向静载荷试验、桩身轴力测试，探讨钻孔灌注桩侧摩阻力发挥的影响因素及荷载传递中的工程性状，为钻孔灌注桩的设计、施工提供参考。     

液压阻尼系统（HDS）控制立式钢制储罐地震响应分析

本文采用液压阻尼系统（HDS）控制立式圆柱钢制储罐的地震反应，建立了安装HDS储罐的力学分析模型，并进行了数值计算，从频域对安装HDS后储罐的地震响应进行了分析，研究了HDS的减震效果和HDS和HDS参数对储罐地震反应的影响。     

摩擦与粘性流体耗能器串联体系动力分析

采用粘性屈服模型来模拟摩擦耗能器的力－速度关系，建立了摩擦与粘性流体耗能器串联耗能体系的动力分析方法．为考虑框架杆件和支撑材料的几何非线性，采用增量型Ｒｏｓｅｎｂｒｏｃｋ二级三阶半隐式Ｒｕｎｇｅ－Ｋｕｔｔａ法求解动力方程．比较了仅有摩擦耗能器体系与串联组合耗能体系的减振效果，分析了粘性流体耗能器参数对组合耗能体系减振效果的影响。     

摩擦耗能框架体系动力分析

采用粘性屈服模型来模拟摩擦耗能器的力－速度关系。建立了带有摩擦耗能器体系的动力分析8方法，采用增量型Rosenbrock二阶三阶半隐式Runge-Kutta法求解动力方程，得到了带有摩擦耗能器单层框架在正弦波激励下反应的解析解，并据此验证粘性屈服模型及求解动力方程算法的正确性，分析了摩擦耗能器的起滑力和支撑刚度对耗能减振效果的影响。     

MRFD半主动控制系统的时滞与补偿

时滞与补偿是基于磁流变流体阻尼器（Ｍａｇｎｅｔｏｒｈｅｏｌｏｇｉｃａｌ　Ｆｌｕｉｄ　Ｄａｍｐｅｒ，简称ＭＲＦＤ）的半主动控制系统优化设计中的一个重要问题。本文对此进行了研究，并通过计算实例分析了时间滞后与补偿两种情况对控制系统性能的影响，结果表明，当时滞达到１．０ｓ时，ＭＲＦＤ半主动控制系统仍具有一定的控制效果，说明该半主动控制系统是可靠的，其性能要优于完全主动控制系统，并且对时滞补偿以后系统的控制效果得到明显的改善，说明本文所述的时滞补偿方法是有效的。