共查询到20条相似文献，搜索用时 62 毫秒
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钢管混凝土结构由钢材和混凝土两种材料组成,具有刚度大、延性好、抗震能力强等诸多优点。试验模型截面尺寸较小会扩大钢管对混凝土的约束效应,大截面尺寸圆钢管混凝土桥墩抗震试验,试验结果更精确反应实际模型工作机理。设计了4个大截面尺寸圆钢管混凝土桥墩模型拟静力试验,得到桥墩在低周反复循环荷载作用下墩顶力-位移滞回曲线图,力-位移滞回曲线比较稳定变化,且套箍系数越大,滞回曲线越饱满,试验桥墩表现出良好的延性和耗能能力。 相似文献
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董振玉 《杨凌职业技术学院学报》2011,10(2):51-52,55
针对小水电站＂机组装机容量小、运行人员文化技术水平相对较低＂等特点,结合自身多年从事小水电的经验,从经济和实用的角度,浅议了小型水电站的水轮机装机容量及机型的选择、电气主接线的拟定及油、气、水系统等有关设计问题。 相似文献
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根据空间解析几何知识,利用计算软件Maple研究创意折叠桌设计。探讨在设定平板尺寸及边缘线形状的条件下,平板折叠桌加工设计问题,如编写设计、加工参数计算程序,可方便地计算出开槽长度和桌脚边缘线方程。 相似文献
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快速确定火炬系统配管尺寸 总被引：1，自引：0，他引：1
Zhan Shiping 《大连大学学报》1992,(4)
本文采用一种新的计算可压缩流体的方法用于火炬系统的配管尺寸设计,在管网布局确定后,可由已知的出口压力 P_2反算管道入口压力 P_1,进而确定各段管线的管径,同时还可得到各段管线出口处的马赫数、摩擦因子等参数.通过限制马赫数及将计算的入口压力与装置允许最大背压相比较,使设计参数进一步优化,同时通过增加计算的循环次数,可方便地处理带有支管的复杂管网系统。整个计算过程均编制了FORTRAN 计算程序,为火炬系统的配管问题提供了一个既安全又经济的最优化设计方案,以使化工厂或炼油厂在这方面的投资减至最少. 相似文献
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吴海珊 《长江工程职业技术学院学报》1995,(4)
露天式压力钢管是《水电站》课程中的一个专门章节,是电站有压引水建筑物的重要组成部分。压力钢管的结构计算,特别是带有支承环或刚性环的截面内力计算是相当繁琐的,如果借用计算机可以快速解决这个问题。下面是笔者关于露天式压力钢管结构设计的构想。一般来说,压力钢管的计算情况有三种,如图1所示。图2为露天式压力钢管结构计算的程序框图,现说明如下。 相似文献
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应用ANSYS通用程序对钢管格构柱试验进行有限元分析,分析结果与试验结果吻合良好.对钢管格构柱极限承载力,进行了偏心率、长细比和构造参数的影响分析,对国内钢结构设计规程GB50017-2003的计算方法进行了评价和讨论,提出了相应的修正建议,最后在参数分析基础上,借鉴钢管混凝土格构柱,提出了四肢钢管格构柱极限承载力的合理实用的计算方法. 相似文献
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针对在装配尺寸链的计算中,装配尺寸精度设计通常所采用的极值公差计算法,计算所得的各组成环的公差过小,导致加工困难．这种计算方法不合理。本文介绍用统计公差法计算各组成环的公差,在保证封闭环的公差要求前提下,计算出的各组成环的公差大些,这样,计算出的尺寸公差,既可保证产品质量,又可降低加工难度,提高经济效益。 相似文献
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奠逸群 《长江工程职业技术学院学报》1991,(1)
长江流域水力资源丰富,总蕴藏量2.68亿千瓦,占全国总蕴藏量6.76亿千瓦的39.6%,可开发量1.97亿千瓦。年发电量10275亿度,占全国可开发年发电量19233亿度的53.4%。开发利用长江水力资源,是长江流域综合利用规划的重要组成部分。40年来,长江流域水电开发,贯彻大、中、小型结合的方针,从规划、设计、施工等方面做了大量工作,取得了重大的成绩。50年代编制长江流域综合利用规划要点报告,拟定以防洪、发电为主的水利枢纽开发计划,对一些大型枢纽的开发方案和实施程序提出了规划意见,建设了一批大中型水电站,各省市因地制宜地开发一些中小水电站。60年代至70年代中期,为满足三线建设的用电要求,在长江流域规划工作基础上,开展西南地区及汉江、赣江中上游的水电选点规划,提出相应的规划选点报告及一些枢纽设计报告。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献