异形柱框架结构在多层住宅中的应用

砖混结构由于抗震性能差,在高烈度地区的应用受到限制。随着粘土砖逐步被淘汰,采用新的结构形式建造多层住宅势在必然。异形柱框架结构由于其使用上的优势和造价适中被广大用户所欢迎。     

框架结构非线性动力时程分析的一个方法

为了较为准确地进行高层框架结构非线性动力时程分析,基于弯矩—曲率恢复力曲线,本文提出了一个较为准确的非线性杆件模型。弯矩—曲率恢复力曲线可以是任意的,而相应的单元刚度矩阵的建立较为简单。另外,本文还提出了用于动力时程分析的精确子结构方法。采用本文提出的方法,使得高层框架的直接动力分析能在微机长进行。     

平面杆系结构的失效包络图及失效评估

定义了平面杆系中的失效评估杆元、以及该杆元的正则杆端弯矩和正则杆端曲率,据此引入了杆件失效包络图、工作状态图、以及杆件失效指标,进而定义了平面杆系结构失效包络图、结构工作状态图。又据该图中反映杆元状态的点群的分布情况,分别从概率分布、加权平均和取最大值的角度定义了三种结构整体失效指标。利用杆元和结构失效指标可简明直观地进行结构失效评估,成为与通常基于结构物理性能改变的结构损伤评估不同的另一种几何评估模式。利用本方法分析了一个三跨六层框架,计算了该框架在多种荷载、梁柱线刚度比、以及失效评估杆元划分密度下的各种失效指标。     

氧化铝厂管网钢管道支架的受力分析及构件选型

通过总结氧化铝厂管网钢管道支架的设计，介绍了多层钢支架的计算模型、计算方法和参数选择，并解决了钢管道支架在氧化铝厂管网中的应用问题。     

刚桁架结构厂房的设计

介绍了某大跨度混凝土屋面厂房的工程概况,比较分析了钢筋混凝土结构、普通钢框架结构和刚桁架结构3种结构选型。在选定的刚桁架结构的基础上,进行了刚桁架的结构分析、节点设计、楼屋面组合梁及混凝土结构分缝的设计。通过对本工程的分析,体现了钢结构在大跨度工程设计上的灵活性及优越性。     

Athletic classmates, physical self-concept, and free-time physical activity: A longitudinal study of frame of reference effects.

The systematic analysis of factors that promote or impede physical activity in children is an urgent task for educational researchers. The present study investigated the reciprocal relationship between physical self-concept, teacher-assigned grades in physical education classes, and free-time physical activity, and analyzed positive and negative consequences of being in a class with high class-average physical ability. Data from a large, representative sample of 1,095 preadolescents from 66 classrooms were examined within a longitudinal framework. Multilevel analyses showed that membership in a class with high class-average physical ability was associated with lower physical self-concept and free-time physical activity and highlighted the significant role of teacher-assigned grades in the development of physical self-concept and physical activity. Furthermore, as predicted, there were positive reciprocal effects between physical self-concept and physical activity levels. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Trading goods versus sharing money: An experiment testing whether fairness and efficiency are frame dependent.

Systematic experiments with distribution games have shown that participants are strongly motivated by considerations of fairness and efficiency. This evidence, however, results mainly from experimental designs in which money is shared directly. Furthermore, fairness does not necessarily require equal payoffs, but may instead require equal allocations. We investigate experimentally the frame dependency of reaching equal (commodity or payoff) splits by systematically comparing net-trade proposals and payoff proposals for the same exchange economy with two traders, two commodities and multi-period negotiations. We can confirm the hypothesis that asking participants to allocate money directly, rather than more naturally via the allocation of commodities, is far from being harmless and likely overstates fairness and efficiency concerns. What is more, we try to apply the insights gained from our experiment to management problems. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

传递矩阵法计算单层多跨不规则刚架

用传递矩阵法分析单层多跨不规则刚架的内力和位移，该方法计算公式规律性强，便于编制电算程序。     

应用有限元和DDA模拟框架结构建筑物拆除爆破

针对建筑物拆除爆破设计中失稳和倒塌范围，提出了采用有限元和DDA进行拆除爆破的数值模拟方法，并以框架结构建筑物为例，进行了实例研究，得到了一系列有实用价值的研究成果。     

网页调用浅析

通过长期的教学与观察,该文对现今在网络上流行的常用的网页调用手段进行了归纳总结,并配以实例对每种方法进行了简要地介绍。论文还对其应用中的注意事项进行了详细的说明,以期给网站开发人员在制作网页时提供帮助。