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近些年来我国建筑钢结构发展迅速,钢结构工程的发展,《门式刚架轻型房屋钢结构技术规程》起了很大推动作用,现就门式刚架房屋设计施工中要注意的问题谈几点看法。 相似文献
2.
浅谈门式刚架轻钢结构设计中的若干问题 总被引：1，自引：0，他引：1
针对门式刚架轻型房屋钢结构设计中遇到的关于选材、檩条设计、整体变形、柱脚的抗风措施、柱间支撑等若干方面的问题进行了论述,并给出一些建议。 相似文献
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在轻型房屋钢结构体系中,门式刚架具有施工快、造价低、扩建灵活、维护费用低和单一供货责任等优点,其用途十分广泛,在工业建筑市场上占主导地位。目前,PKPM系列软件的STS模块已经能进行轻型钢结构门式刚架的分析计算、截面优化设计、节点设计和施工图绘制。对门式刚架轻钢房屋结构进行优化设计,为使其达到标准化、规范化、通用化、经济化势在必行。探讨了优化设计的几个着手点。 相似文献
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普通钢结构一般由钢屋架、组合柱(H型钢、钢管、槽钢等)和大吨位吊车梁等组成，适应于荷载或吊车起重量较大的结构，以及有较大震动和抗震要求的结构。随着国民经济的产业结构调整，普通钢结构逐渐减少，而轻型实腹梁。实腹柱及小吨位吊车梁等逐渐增加，特别是门式刚架轻型房屋钢结构的应用日益广泛，数量也日益增多。门式刚架自重轻，构件一般在金属结构厂制作，施工机械化，运输安装简便， 相似文献
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本文主要对门式钢架轻型房屋结构质量控制进行分析,从门式刚架轻型房屋钢结构的特点入手,总结出其在国内外建筑行业的运用,从而进一步归结出其应具备的质量要求,进而对当前轻钢门式刚架结构安装存在的问题对以及其对门式钢架轻型房屋结构质量控制影响的进行探讨。 相似文献
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对刚架设计采用<建筑结构荷载规范>(GB50009-2001)(2006年版)、<钢结构设计规范>(GB50017-2003)、<冷弯薄壁型钢结构技术规范>(GB50018-2002)或是<门式刚榘轻型房屋钢结构技术规程>(CECS102:2002)进行了比较,说明选择不同规范其计算结果会有很大差异. 相似文献
7.
采用现行《建筑结构荷载规范》作为比较标准。通过CFD方法,湍流模型选用标准模型对二维轻型门式刚架屋面进行风压分析,得出在迎风面轻型门式刚架屋面的边缘的风压比较大。为轻钢结构屋面的设计提供参考。 相似文献
8.
轻型钢结构门式钢架由于其结构简单、便于安装以及节省钢材用量等优势在国内一些工业厂房建设中的应用十分普遍,但是如果在设计阶段出现失误导致轻型钢结构门式刚架计算假定与实际受力不符,不仅会增加施工难度还会造成工程隐患酿成工程事故,节约成本更是无从谈起.因此本文对轻型钢结构门式钢架设计中常见问题与解决措施进行浅议 相似文献
9.
钢结构施工中容易出现的问题 总被引：1，自引：0，他引：1
《门式刚架轻型房屋钢结构技术规程》公布以来，钢加结构工程取得了快速发展，这期间《规程》起了很大推动作用。今冬雨水较大，降雪较多，有些地方雪特别大，结构压坏恐怕很难避免，但有的地方雪不大房子也有垮的，漏水的更多。某厂屋顶漏水解决不了，不是雨水，是冷凝水，以前还没有碰到过。另外，也看到一些工程，有的框架梁太细，令人担心，遇到大雪很可能出问题。 相似文献
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11.
A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
12.
《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
13.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
14.
《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
15.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
16.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
17.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
18.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
19.
Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献