板柱结构的应用研究

通过对国内外板柱结构研究成果的总结与分析,得出结论:国内外对板柱节点的静力性能研究较多,对其动力性能,尤其是板柱结构体系的动力性能研究较少;认为有必要对其进行动力性能的实验研究;并提出了钢筋混凝土板柱结构抗震设计建议方法。     

考虑多参数分析薄壁箱梁剪滞效应的剪滞公式

考虑多参数及剪切变形分析薄壁箱梁剪滞效应 ,获得了利用最小势能原理建立的力学模型的理论解 ,根据不同边界条件推导出应力计算公式 .所得的公式比以往剪滞理论有了发展 ,且更具有一般性 .     

Left-lateral shear deformation found in southern part of the Gaoligong range in west Yunnan and its tectonic implications

It is generally understood that the Tertiary structural deformation in the Gaoligong range in west Yunnan was under the control of right-lateral shear, resulting from the northward movement of Indian relative to Eurasian. In the southern part of Gaoligong range, however, we have recently found many pieces of evidence of left-lateral shear deformation, featuring a 10 km wide shear zone cutting through all tectonic elements of the range in N-S direction, which possibly occurred in late Tertiary time, and postdated the right-lateral shear. This is a significant discovery for revealing characteristics of the Tertiary intracontinental deformation of the Gaoligong range and the interaction between the Indian and the Eurasian continents.     

Instability of the shear layer in the near wake of a circular cylinder

The instability of the shear layer separated from a circular cylinder is studied with the Reynolds number (Re) of 3000～104 by numerically solving the two-dimensional Navier-Stokes equations. In the wake of the cylinder, primary vortex shedding with natural frequency fs occurs, and the instability of the shear layer with frequency ft develops, which leads to mixing layer eddies and interacts with the primary shedding vortices. However, there remains some uncertainties regarding to the variation of the shear layer characteristic frequency with the Reynolds number. Based on the previous experimental work, several relationships of ft/fs with Re has been proposed including ft/fs～Re0.5 by Bloor, ft/fs～Re0.87 by Wei and Smith and ft/fs～Re0.67 by Prasad and Williamson. The objective of this study is to predict reasonably the relation of the shear layer instability frequency with the Reynolds number based on the present accurate calculation with the high-order schemes and high-resolution spectrum analysis. According to our calculated results, a variation for the normalized shear-layer frequency of the form ft/fs～Re0.69 is predicted numerically, which is in good agreement with a recent experimental measurement of Re0.67 and physical prediction of Re0.7.     

无剪切闭锁的厚薄板矩形单元的构造

在板弯曲的有限元计算中 ,因为剪切闭锁现象导致厚板元无法自动退化为薄板元 ,工程中很难构造既适用于厚板又适用于薄板的计算单元 ,因此采用由龙驭球教授提出的广义协调元法 ,构造了矩形厚薄板弯曲通用计算单元 .通过铁木辛柯梁理论 ,建立了板单元边界和板单元内部的位移插值场函数 .计算结果表明该单元可顺利解决剪切闭锁现象 ,可在实际工程中推广应用     

弹塑性有限元法在土坡稳定分析中的应用

通过抗剪强度折减弹塑性有限元法研究土坡的总体安全系数及相应的变形状态，通过与传统极限平衡法的对比分析，对强度折减有限元法分析土坡稳定问题的优缺点进行了评价。     

一维离散有限元法计算箱形梁剪力滞效应

本文以薄壁杆理论为基础，由能量变分原理出发，运用一维离散有限法推导出薄壁箱梁剪力滞效应计算的格式，从而将空间三维问题简化为一维离散计算模型，实例计算表明，此方法计算结果与变分法，有限元法等计算方法的结果相吻合。     

纳米蒙脱土对环氧树脂胶黏涂层性能的影响

研究了MMT-0、MMT、粉煤灰、B4C作为填料在环氧树脂胶黏涂层中的作用。在WE／30液压万能试验机上测试其剪切强度，得出最佳配比是：MMT为5％，MMT-0为50％，粉煤灰为l50％，B4C为125％，在罐式浆体冲蚀磨损试验杌上测试了最佳配比时涂层的冲蚀磨损率。结果表明：MMT作填料时剪切强度高，冲蚀磨损率低。     

河南鲁山黄土岭韧性剪切带型金矿床包裹体研究

包裹体研究表明，河南鲁山黄土岭韧性剪切带型金矿的成矿流体为低盐度、中低温度、高硫、富ＨＣＯ和Ｃｌ－及碱金属离子的热流体。包裹体类型有ＣＯ２，ＣＯ２－Ｈ２Ｏ及Ｈ２Ｏ三种，它们在矿物中共生，并且各自的密度、盐度有区别，表明包裹体捕获时流体发生过沸腾作用，有过相态分离。包裹体水同位素研究结果显示热液以变质水为主，混有一定量的岩浆水与雨水。沸腾作用、相态分离是矿床形成的关键因素。ＣＯ２包裹体大量出现、流体中ＣＯ２的高含量、富硫等是这类矿床的找矿标志。     

某高层办公楼高低双筒－框架结构设计

就某高层办公楼主裙楼高低双筒－框架结构体系的选型、剪力墙数量的确定及布置、结构抗震计算、抗震构造措施和主裙楼的差异沉降及处理等问题作了探讨．