单层球面网壳地震反应特征分析

考虑不同矢跨比、荷载、跨度和支座刚度等多种因素的影响,对单层球面网壳在地震作用下的反应进行了较全面的研究,给出了其随各参数变化的规律,得出了在单层球面网壳抗震设计中起控制作用的是水平地震作用而不是竖向地震作用等有益的结论.此外本文还给出了由于阻尼比不同而需对引用现行抗震规范反应谱分析的网壳地震作用进行修正的建议.     

筒体结构连续化模型的弹性动力时程分析

本文用连续化模型对高层筒体结构在地震作用下的动力时程反应进行分析．     

拉索_网壳结构的动力特性和非线性动力反应

将空间网壳结构与拉索有机结合便形成拉索-网壳结构体系。该体系不但具有美学特征，更可进一步增大跨度。基于泰勒数学展开公式和变分原理，推导了具有二阶精度的空间杆单元几何非线性刚度矩阵；研究了拉索单元非线性问题，得出了其切线刚度矩阵；给出了结构非线性力学响应计算策略等。通过数值计算，分析了结构动力特性和非线性地震动力响应问题。计算结果显示，拉索-网壳结构的自振频率皆明显高于对应的网壳结构，且频谱较为密集，甚至不同序号的自振频率几乎相同，拉索-网壳结构的地震动力响应不但与拉索长度、截面尺寸、预拉力和布置方式有关，还与塔柱高度、截面尺寸等有关。     

实行全面质量管理 做好江口水电站工程设计

江口水电站是芙蓉江干流开发中的骨干工程。为认真履行江口工程的设计合同，确保优质、高效地完成江口工程的各项设计工作，长江委设计院实行全面质量管理，建立了一套规范化的统计管理程序，制订详细的设计计划，落实江口工程项目各级责任人的质量责任制，采取特殊技术措施，对工程设计过程中的各项质量活动进行全过程的管理，使江口工程在满足质量标准、合同进度的情况下，工程投资最省。     

莺歌海地区低电阻率气层测井响应特征与判别方法

文中概述了莺歌海地区低电阻率气层的主要测井响应特征,详细分析了低电阻率气层的成因,并提出了测井判别方法.特别强调指出局部发育的菱铁矿对该区地层电阻率无明显影响.     

文克尔地基上中面x方向受力的矩形薄板的振动

建立文克尔地基上x=0与x=a两对边受面内均布拉(压)力作用的矩形薄板自由振动和强迫振动的微分方程并求得其通解。给出振型函数的表达式，用广义函数的富里叶展开，讨论板在不同形式载荷作用下的强迫振动响应。文中导出的各种情况下的影响函数，亦可用于求解相应情况下矩形薄板的静力弯曲与稳定性问题。     

阶梯轴的横向弯曲振动

利用广义函数导出阶梯轴横向弯曲振动的微分方程。应用作者在文献[1]、[2]中引入的 W 运算符,给出了建立阶梯轴横向弯曲自由振动的特征方程的一般简易方法。文中还讨论了应用广义函数的 Fourier 展开来求解阶梯轴横向弯曲强迫振动响应的方法。     

Energy Value of Resistant Starch

Resistant starch was evaluated for energy value using fine silica and normal starch as controls and young rats as a test model. The net increase in rats' carcass energy due to the test materials fed over a 3-wk period formed the basis for assessing energy value. Rats fed normal starch deposited about twice as much fat and significantly more protein in the carcass than those fed either resistant starch or silica. Rats fed resistant starch or silica showed similar growth responses and increases in components of body composition and carcass energy content. This suggested that resistant starch provided, like silica, no energy.     

On the hollowness ratio effect on the dynamics of a spinning Rayleigh beam

The analytical solutions of a spinning Rayleigh beam with rotatory moment inertia and gyroscopic effect are presented in this paper. The critical speeds can be written analytically in a function of the length-to-radius ratio (l) defined by the beam's length over its outer radius and the hollowness ratio (α) defined by the hollow area over the total area of the cross section. The sensitivity analyses show that the critical speed is decreasing with l, but increasing with α. Moreover, α is more sensitive to the critical speeds. The design of a spinning beam should therefore be emphasized more on the hollowness factor. Contrary to common belief, only finite critical speeds exist and the number is independent of the boundary conditions. It increases monotonically with l, but decreases with α. The steady state unbalanced response can therefore be expressed analytically by the finite precessional modes and the corresponding generalized coordinates.     

A review of robust design methods for multiple responses

Problems in engineering design often involve determining design variable settings to optimize individual product performance for multiple criteria, which are often in conflict. We review mathematically rigorous techniques from the statistical literature for finding a vector x of design variable settings, which produces an optimal compromise solution among a group of prioritized response variables. The best compromise solution is typically gained by optimizing an objective function, which incorporates the prioritized demands of multiple responses. Since most multi-response objective functions are constructed by combining the functions used to optimize univariate responses, a review of the prominent univariate approaches is presented first. A multivariate approach from the engineering literature called the compromise Decision Support Problem is also reviewed. Finally a table comparing the relative merits of the different multivariate approaches summarizes the article in a concise and user-friendly fashion.