高层建筑超长结构无缝设计探讨

以某高层建筑超长结构无缝设计为例,笔者分析了导致结构形成裂缝的几个主要因素。提出了当选择无缝概念进行超长结构设计时,应从设计、材料、施工等方面采取的主要预防控制措施,可供类似工程设计借鉴、参考。     

铝铸轧带坯豁边原因分析

对铝铸轧带坯产生豁边的影响因素进行了全面分析。并根据实践提出了防止铝铸轧带坯豁边的措施。     

The use of bubble functions for the post-local buckling of plate assemblies by the finite strip method

The finite strip displacement functions for post-local buckling are augmented with so-called bubble functions, which are extra modes associated with internal or nodeless degrees of freedom. A non-linear finite strip method of analysis including bubble functions is described for the post-local buckling of geometrically imperfect plate assemblies. It is shown that the use of bubble functions improves significantly the convergence of the method. The non-linear finite strip method is then used to study channel and I-section members in compression and bending.     

聚丙烯土工带在建筑工程地基处理中的应用

结合地质情况，针对水泥粉喷桩施工中的问题，提出了使用聚丙烯土工带的地基处理方案。重点对土工带的性质、应用原理、施工方法进行了阐述。指出应用聚丙烯土工带增强了地基的整体性，提高了防止不均匀沉降的能力。     

采用寄生条带的双陷波UWB天线设计

针对超宽带通信与现有的民用通信存在频带交叠的问题,提出一种使用共面波导馈电的具有双陷波特性的超宽带(UWB)天线.通过在共面波导馈电线底面引入2条接地的寄生贴片来实现频段内的双陷波特性.研究结果显示,该天线在3.1～10.6 GHz的频带范围内具有良好的阻抗特性和辐射方向特性,其中在5.15～5.35 GHz和5.75～5.85 GHz范围内具有陷波特性.     

基于NSGAⅡ的高精铜板带配料优化问题

为实现高精铜板带配料过程的优化,建立了考虑降低成本、减少烧损、循环利用旧料且满足多种旧料可代用性等配料原则的配料优化模型,并利用拉格朗日松弛法对模型进行了变换.针对所建模型,设计了基于第2代非支配排序遗传算法（NSGAⅡ）的求解方法,重点研究了染色体表示、比较算子和基于模糊集合理论的Pareto选优方法.研究结果表明,与现有配料算法相比,此种求解方法可获得更优的结果且一次运行便可提供多种可行的配料方案.     

Beliefs and behaviours relevant to the road safety effects of profile lane-marking

Audio-tactile lane-marking (ATLM) is designed to alert inattentive drivers when they deviate from their lane, and appears to reduce crashes. Research into cognitive-behavioural mechanisms underlying, or possibly undermining, the efficacy of ATLM, is limited. We surveyed 775 randomly selected drivers (42% female, up to 75+ years) regarding the profile line-marking (PLM) employed in Australia (and in some European countries). Respondents perceived advantages of PLM in terms of lane-keeping and visibility. Respondents reported avoiding edge-line PLM, so that it may result in driving too close to untreated centre-line. Findings generally allayed concerns, on the basis of risk homeostasis theory, that PLM may increase risky driving. Perceived efficacy of PLM was not associated with increased drink-driving or speeding, but was associated with increased driving while fatigued. Findings suggest that the efficacy of PLM may be increased by employing PLM on both edge- and centre-lines, by exaggerating the audio-tactile effects of PLM that cause drivers to avoid it, and by discouraging the belief that it is safe to drive while fatigued when PLM is present.     

立式壳管式氨冷凝器自动除垢防垢技术

简述了常用的除垢方法 ,重点介绍了一种新的自动清洗技术———在每根冷凝管内悬挂一条特制的塑料螺旋纽带 ,利用冷却水带动纽带自转对管内污垢实行刮擦清洗作用。在某大型肉联厂初步的工业应用试验结果表明 ,安装纽带后冷却水进出口温度差比安装前提高了 2 7.5 %。     

格构木梁加固方法的研究

进行了10根木梁的对比试验研究,其中3根为对比普通木梁,3根为未加固格构木梁,4根为加固格构木梁。研究结果表明:未加固格构木梁的受弯承载力和初始弯曲刚度较普通木梁均略有降低;底面粘贴1层碳纤维(CFRP)布加固格构木梁的受弯承载力较未加固格构木梁显著提高54%,初始弯曲刚度提高34%,极限位移显著提高63%。空隙处采用结构胶或灌浆料填充的格构木梁的受弯承载力平均提高30%,初始弯曲刚度显著提高195%,极限位移则显著降低54%。结构胶填充并在梁底面粘贴1层CFRP布的加固格构木梁受弯承载力显著提高92%,初始弯曲刚度显著提高251%,极限位移则降低48%。未加固格构木梁和粘贴1层CFRP布加固格构木梁的受拉肢和受压肢跨中应变变化分别保持平截面假定;其受压肢和受拉肢均为下侧受拉上侧受压,中间木垫块基本不受力。空隙采用结构胶填充的加固格构木梁跨中全截面应变变化基本保持平截面假定;其受压肢受压,受拉肢受拉,中间木垫块亦参与全截面受力。研究表明:在格构木梁空隙处填充灌浆料或结构胶可显著提高其初始弯曲刚度,但对提高承载力不显著;在格构木梁底面粘贴CFRP布可显著提高其承载力,但对提高初始弯曲刚度不明显。格构木梁有限元数值模拟结果可满足工程应用的精度要求。     

粘贴竹片加固木梁的研究

木结构使用功能变更或使用荷载增加均可能导致木梁受弯承载力不足,需采用措施进行加固。共进行了6根木梁采用竹片加固的对比试验研究,其中3根为对比试件,3根为粘贴竹片加固木梁试件。研究结果表明:粘贴竹片加固木梁受弯承载力可提高48.0%～83.1%,平均提高69.5%;同时破坏位移亦有所增加。加固木梁跨中截面仍基本符合平截面假定;在相同荷载作用下,加固木梁受拉边缘拉应变和受压边缘压应变明显小于对比试件;不同位置竹片随荷载增加时的应变变化基本一致,且应变值相近。粘贴竹片加固木梁是一种低碳高效的加固技术。