用波形拟合方法检测桩基质量

提出了一种用桩的已知缺陷计算多次反射波叠加效应的递推算法，并编制成微机程序，可对桩的任意缺陷进行拟合．实践证明，该法对判断桩的浅部缺陷和多缺陷并存的情况较为有效，改善了原有反射法的解释精度．     

内蒙古太古宙变质岩系中石榴石的矿物学特征及其地质意义

本文对内蒙古南部太古宙集宁群变质岩系中6个石榴石样品进行了研究,讨论了晶体形态、物理性质、化学成分与岩石成分和波谱学之间的关系。研究表明,本区(含石墨)富铝片麻岩类岩石中,石榴石以富镁的铁铝榴石组份为主,而二辉石岩中的石榴石则以富钙的铁铝榴石组份为主。石榴石钙的含量受岩石成分所控制。从测得的晶胞参数来看,除个别者外,a_0值均随着Ca~(2 )的含量增加而增大。据穆斯堡尔谱分析,本区集宁群变质岩系中除个别样品受到了氧化或蚀变而有Fe~(3 )成分混入外,大部分石榴石可能都是在变质程度比较高的还原环境下形成的。     

Cones to model foundation vibrations: incompressible soil and axi-symmetric embedment of arbitrary shape

The recently streamlined strength-of-materials approach using cones to calculate vibrations of foundations embedded in layered half-spaces and full-spaces is applied to incompressible and nearly-incompressible soil and to axi-symmetric embedments of arbitrary shape. For incompressible soil the axial-wave velocity in the cones is limited to twice the shear-wave velocity and a trapped mass for the vertical motion and a trapped mass moment of inertia for the rocking motion moving as a rigid body with the under-most disk of an embedded foundation are introduced. In the case of a fully embedded foundation, a mass and a mass moment of inertia are also assigned to the upper-most disk. For an axi-symmetric embedment of arbitrary shape, the disks have varying radii. No modifications to the formulation are, however, required. For these two extensions the strength-of-materials approach using cones leads to the same sufficient engineering accuracy as is achieved in other more conventional cases. This is demonstrated in a vast study. Thus the same other advantages also apply: physical insight with conceptual clarity, simplicity and sufficient generality.     

Structural vibration control by shape memory alloy damper

A damper device based on shape memory alloy (SMA) wires is developed for structural control implementation. The design procedures of the SMA damper are presented. As a case study, eight such SMA dampers are installed in a frame structure to verify the effectiveness of the damper devices. Experimental results show that vibration decay of the SMA damper controlled frame is much faster than that of the uncontrolled frame. The finite‐element method is adopted to conduct the free and forced vibration analysis of the controlled and uncontrolled frame. The experimental and numerical results illustrate that the developed SMA dampers are very effective in reducing structural response and have great potential for use as efficient energy dissipation devices with the advantages of good control of force and no lifetime limits, etc. Copyright © 2003 John Wiley & Sons, Ltd.     

Adaptive bang–bang control for the vibration control of structures under earthquakes

An adaptive method based on the modified bang–bang control algorithm is proposed for the vibration control of structures subjected to unexpected severe seismic loads greater than the design loads. A hydraulic‐type active mass damper was made and experiments were carried out in the laboratory using a one‐story test structure and a five‐story test structure with the active mass damper. Through numerical simulations and experiments it was confirmed that the proposed method works well to suppress the vibration of structures subjected to unexpected severe seismic loads greater than the design loads without causing any unstable situations. Copyright © 2003 John Wiley & Sons, Ltd.     

形状记忆合金拉压型超弹性阻尼器的试验研究

本文作者研制了一种新型的形状记忆合金拉压型超弹性阻尼器，介绍了其构造和工作原理，并进行了力学性能试验。试验结果表明：(1)对形状记忆合金阻尼器中NiTi丝缆施加初始预变形可以获得不同的迟滞循环行为，施加预变形到超弹性平台的中点位置，阻尼器可以获得较为饱满的迟滞环和稳定的阻尼力；(2)位移幅值影响阻尼器的力学性能，随着位移幅值的增加，阻尼器的等效刚度逐渐减小。等效阻尼比逐渐线性增大；(3)加载速率影响阻尼器的力学性能，随着加载速率的增加，滞回环变得狭长，其包围的面积逐渐减小，阻尼器的等效刚度略有提高，等效阻尼比逐渐减小。     

会昌地震台数字与模拟地震波形和震级的对比初探

通过会昌台数字与模拟地震记录到的多个地震事件进行对比分析，认为前者在记录带宽、获取更多的地震动物理量、记录波形能力及可操作性等方面具有显著的优势，数字观测完全可以取代模拟观测；对两种记录计算的地震震级进行了对比与统计分析，发现数字记录近震的震级比远震的偏差要大，远震震级可直接与全国地震目录接轨。     

膨胀石墨表面非极性吸附研究

通过对膨胀石墨表面SEM及缸外光谱的测定发现，膨胀石墨表面具有发达的孔缘，多为中孔或大孔，且带有非极性基团，因此非常有利于非极性大分子的吸附，但膨胀石墨极轻、易碎，在实际应用中有一定局限性。以润滑油为非极性吸附物，运用改变密度及粘接技术增强膨胀石墨强度，同时研究了密度及粘接剂比例与吸附量的关系．     

Research on Effect of SMA Damper in Passive Control

In this article, mechanics model of SMA center tension from damper is developed. According to the theory of Brinson constitutive model and thermodynamics first law, damper thermodynamics non-linear equation has been developed. Dynamics non-linear equation of frame structure under operation of SMA damper and its solution have been worked out; the software of seismic response analysis for frame structure and of damper characteristic analysis have been compiled with MATLAB software, andthe examples have been computed with it. The result indicates that SMA damper has obvious damp characteristics and it can provide with obvious restraint effect for seismic response of frame structure. Decreasing rate of displacement and velocity on top of frame structure reaches 50％-60％. The result is in accordance with other pundits experimentation results, which indicates that the above methods are correct and useful.     

Microstructural features of fault gouges from Tianjing-shan-Xiangshan fault zone and their geological implications

Detailed observation of the microstructural features of 11 fault gouge and 3 fault breccia samples collected from Tianjingshan-Xiangshan fault zone has revealed that fault gouge can be classified into 3 types: flow banded granular gouge, foliated gouge and massive gouge. The determination of the shape preferred orientation (SPO) of survivor grains in fault gouges indicates that the foliated gouge displays a profound SPO inclined to the shear zone boundary, similar to theP-foliation; flow banded granular gouge displays a SPO parallel to the shear zone boundary, while massive fault gouge and fault breccia display a random SPO. All these fault gouges fall in different fields of shear rate ternary diagram.