钢筋混凝土空心剪力墙弯剪受力性能试验研究

通过对3个钢筋混凝土空心剪力墙弯剪试件在低周反复水平荷载作用下的试验研究，探讨了两种不同配筋试件的破坏机理、变形特征、截面钢筋的应变情况及其极限承栽能力。试验结果分析表明，墙端无暗柱的剪力墙发生承载力很低的脆性破坏。在空心剪力墙端部设置暗柱可以明显提高墙的承载力和延性。，文中给出带暗柱空心剪力墙截面承载力的计算方法，计算结果与试验结果符合较好。     

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.     

输入整形器抑制残留振荡的研究

输入整形是一种用来抑制柔性结构系统残留振荡的前馈技术，本文研究了ZV和ZVD两种输入整形器，仿真结果证明其有效性。     

双向地震耦合作用对基础摩擦隔震结构的影响

采用多质点层间剪切型模型,建立了基础摩擦隔震多层砌体结构在水平与竖向耦合地震作用下的运动微分方程及滑动与啮合状态判别准则·通过数值计算,分析了竖向地震作用对隔震结构的影响,研究表明,竖向地震作用的存在,使隔震结构下部各层,特别是首层的层间位移,层间剪力增加,隔震层加速度增加,且随地震烈度,竖向加速度峰值增大而增加,并使隔震层的滑动位移幅值有增大的可能·建议在高烈度震区考虑竖向地震作用对结构反应的影响·     

钢筋混凝土框架柱受力全过程分析

为了对在压弯剪复合受力情况下的钢筋混凝土框架柱进行合理的受力全过程分析，采用桁架—拱模型、协调备件和钢筋混凝土应力-应变关系，并结合最小势能法，经过计算机编程，进行了不同参数的框架柱在复合受力情况下的全过程分析，通过计算结果与国内不同参数的52个框架柱和46个约束梁实验结果的对比，数据吻合较好，取得了较为满意的结果，为规范的修订、设计及施工提供有益的参考。     

齿轮在高温工作环境下对使用寿命的影响

通过对齿轮产生点蚀的情况进行分析，从而得出了该减速器内齿轮使用寿命短的原因是由于润滑油清洁度差，温度过高所造成的，并采取相应的措施；使问题得以解决。     

海冰强度对应变速率敏感性及其演化模式

海冰对应变速率变化较敏感,在不同应变速率范围内可表现出不同的力学行为和强度特性.如辽东湾海冰在低应变速率下(ε.<1.0×10-3s-1),表现为连续体特征,其变形行为符合流动定律;在高应变速率下(ε.>3.0×10-3s-1),表现为脆性体特征,强度特性可用断裂力学理论描述;在韧-脆转变的范围内(1.0×10-3s-1<ε.<3.0×10-3s-1),海冰强度达到最大值.因此在不同应变速率段,海冰强度具有不同的本构模型.用海冰演化模式对辽东湾海冰(T=268K,d=7.0mm)进行了数值计算,结果与实验值十分吻合,说明该演化模式是有效的.     

混凝土高温后进行粘结劈拉强度试验研究

为了研究混凝土结构建筑物在高温（火灾）损伤后进行混凝土粘结修补的粘结性能，对经历高温混凝土与新混凝土的粘结试件进行了劈拉强度试验。温度从常温到900℃分为9个温度段，采用空气中自然冷却和喷水冷却两种降温方式，考虑了新混凝土强度和界面剂的影响，系统地研究了各种参数对新老混凝土粘结性能的影响规律，指出高温后粘结机理主要是由老混凝土的损伤程度所决定的。     

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.     

The Effect of Strain Rate on Tensile Properties of Cotton Yarns

The effect of strain rate on tensile properties of cotton yarns is analyzed using the standard linear solid model. The tensile curve, breaking strength and work of rupture of the yarns under different strain rate are calculated. A good correlation exists between the experiment results and theoretical anticipations.