桁架式SRC偏压构件计算方法的试验研究

结合南昆线南盘江太桥SRCV形斜撑所用桁架式劲性骨架的特点，进行了此类型SRC偏压构件6个试件的试验。根据试验结果．给出了此类SRC偏压构件使用性能和承载能力的计算方法。     

车次号在DMIS工程中应用的探讨

对列车车次号的工作方式及其运用进行了介绍，提出了一些发展设想。     

新体制下铁路物资供应模式的思考

分析了传统的物资供应模式“点库存”、“点送料”模式及其存在的问题，提出了新的供应模式“网库存”模式并进行了可行性分析。     

供体腓骨切除后踝关节的生物力学研究

118例供体腓骨中上段部分切除患者,对其中的50例进行了1年～8年的随访。对随访病例作了双侧踝关节的临床功能、足弓及X线片检查,并用自己研制的踝关节功能测定仪,检测踝关节的主动运动肌力及运动幅度,进行双侧对比。对各项检则结果进行了分析讨论,综合评议得出结论:切取腓骨中上段一部分对踝关节功能无明显影响,证明腓骨作为供体是可取的。     

装备维修保障资源优化配置的遗传算法

装备维修保障资源的合理配置，是装备保障的重要内容之一。提出一个基于遗传算法的资源优化配置算法模型，给出了模型求解的有效算法。最后，给出具体的计算实例，以验证优化配置方法及算法的有效性。     

铁路工程局的经营战略研究

本文通过对一铁路工程局经营现状的调研分析，提出该工程局的经营战略，并对该战略进行了可行性论证，提出实现该战略应采取的相应措施。     

A review of the effect of a／W ratio on fracture toughness （Ⅰ）—experimental investigation in EPFM

Many experimental investigations have previously been performed and recently done on different shipbuilding structural steels where the specimens size and crack depth/specimen width (a/W) were varied. A series of interesting results have been gained. It is worthwhile to have a review on the effect of a/W ratio on fracture toughness, and further theoretical analysis is necessary. In this paper, experimental work in elasticplastic fracture mechanics (EPFM) was discussed. Tests had been carried out on 10 kinds of strength steels. Results showed that J _i and δ₁ values increased with decreasing a/W when a/W<0.3 for three-point bend specimens and that shallow crack specimens which have less constrained flow field give markedly higher values of toughness than deeply notched specimens. However, for a/W>0.3, the toughness was found to be independent of a/W. Slip line field analysis shows that for shallow cracks, the hydrostatic stress is lower than that from standard deeply cracked bend specimen which develops a high level of crack tip constraint, provides a lower bound estimate of toughness, and will ensure an unduly conservative approach when applied to structure defects especially if initiation values of COD/J-integral are used.     

Determinants of crew injuries in vessel accidents

This study investigates determinants of the number of non-fatal crew injuries, fatal crew injuries and missing crew in freight ship, tanker and tugboat vessel accidents based upon individual accidents investigated by the US Coast Guard for the 1991-2001 period. Poisson and negative binomial regression estimates suggest that: (1) freight ship and tanker non-fatal injuries are higher when the vessel is moored or docked and during high winds and cold temperatures; (2) tugboat non-fatal injuries are higher during poor visibility; (3) freight ship fatal injuries increase with vessel age and tanker and tugboat fatal injuries are higher for fire and capsize accidents, respectively; and (4) freight ship missing crew increase with vessel age and tugboat missing crew are higher for fire and lake accidents.     

钢筋混凝土烟囱定向爆破倒塌运动解析

从力学原理推导分析钢筋混凝土烟囱定向爆破倾倒运动过程中的时程、下墩和后坐问题,得到有关计算公式,计算结果与烟囱爆破的实际情况相符合。     

疲劳试验在橡胶减振制品寿命预测中的应用

橡胶减振制品的耐疲劳特性严重影响其使用寿命。文章阐述了橡胶减振制品疲劳失效的判断准则和疲劳试验在使用寿命预测中的应用，以及国内外在橡胶减振制品寿命预测方面的研究进展情况。