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铝合金人行桥因质轻、便于吊装施工等特点而成为人行桥设计新选择,但由于铝合金质轻、弹模低使得相比于钢结构人行桥更易出现振动舒适性问题。文中以三座大跨铝合金人行桥为对象,对行人质量影响下的结构振动基频及人致振动响应进行了分析,与同结构形式下钢结构人行桥进行了对比讨论,并结合各国振动舒适性规范对振动舒适性进行了评价。结果表明,铝合金人行桥因质量轻,相比于钢结构其振动基频对行人质量影响较敏感,设计中需考虑行人质量对降低结构基频的影响,从而使结构从超谐共振进入共振而产生过大振动,设计中建议适当提高结构振动基频以满足舒适性要求。 相似文献
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通过模拟人行随机荷载激励,分别采用四种人行荷载工况对一座既有钢结构人行桥进行了人致振动时程分析,从而更好地了解该人行桥在行人激励下的动力特性。考虑到现有人行桥的动力特点及对其振动舒适度评价方法的不足,提出了考虑结构双向耦合振动的舒适度评价方法,并对该桥进行了舒适度评价,证明了该桥在动力性能上存在的问题。这对人行桥人行荷载模拟、人行桥振动舒适度评价以及防振减振研究都具有参考借鉴意义。 相似文献
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随着城市综合体和城市交通的发展,钢结构人行桥广泛应用在地铁与城市快速路周围。钢结构人行桥趋向轻柔、大跨、低阻尼,在综合环境外部激励作用下可能会引起人行桥的过大振动,主要是桥上人行荷载引起的人行桥振动以及桥下车辆和地铁通过产生的地面振动引起的人行桥振动。不合适的振动会影响桥上行人的舒适度以及结构安全,需要结合人行桥的动力特性进行针对性的分析和减振设计。本文以上海某大跨度钢结构人行桥为例,建立舒适度评价标准,对人行荷载以及桥下车辆和地铁通过产生的地面振动引起的人行桥振动进行舒适度评估,进行相应的减振设计。结果表明,针对人行荷载采取的TMD减振措施以及针对地铁和车辆交通采取的桩-桥墩共同减振措施均可以满足本工程的舒适度设计要求。 相似文献
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涡激振动是在低风速下很容易出现的一种风致振动现象,一维钝体涡激振动具有自激、自限特性。拍振则是涡激振动一种典型形式,为钝体固有频率和涡脱频率共同作用结果。拍振理论研究目前为止仍未有满意结果;主要通过数值计算方法和风洞试验进行研究,数值计算难度很大难以实现;风洞试验研究较直观,但不能解释其作用机制。基于Scanlan非线性模型,采用KBM法(渐近法)推导一维钝体竖向涡激振动拍振响应一次近似解,探讨通过拍振时程响应曲线识别气动参数、涡激力方法。最后,以一大跨度桥梁主梁节段模型风洞试验为例,识别气动参数及其非线性涡激力。 相似文献
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针对上海地铁运行引起地面振动的预测问题,应用振源模型计算不同车速对轨道基础的激振力,应用传播模型计算不同激振力输入下的地面振动加速度,建立了“地铁-隧道-土层”系统动力有限元模型。通过对比数值模拟结果与实测结果,分析了不同因素对地铁引起地面振动的影响规律。结果表明:随着地铁车速增加,振源激振力和地面振动加速度的幅值均明显增大;地面上距地铁中心线30 m范围内各点振动加速度峰值随距地铁中心线距离由近及远呈幂函数形式衰减;地面振动加速度频率主要为低频振动,随着距地铁中心线距离的增大,高频衰减相对于低频更为明显;建议上海地区建筑尽量在地铁中心线20 m范围外进行规划,或采取降低设计车速、减轻车辆荷载、优化隔振措施等方法,减少地铁运行引起地面振动对地面建筑及居民生活的影响。 相似文献
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本文以山西中南部铁路通道(简称"晋中南")线路选线设计为例,对矿区修建大能力运输通道,如何选择经济、合理的线路平、纵方案提供技术思路。文中首先简述晋中南铁路沿线矿区分布,运输现状和规划情况,预测该铁路对沿线煤矿集运系统所产生的影响,明确铁路功能定位,从而确定线路宏观走向;然后以山区地形、煤矿采空区范围为平纵控制条件,在保证铁路稳定的前提下开展微观方案研究,采纳即满足服务矿区运输,又减少或避免占压矿区资源的线路方案,正确处理铁路与各矿区的空间位置关系;希望通过本文,对今后货运铁路在困难地形,采空区双重不良影响下能正确处理路矿关系,采纳技术、经济和谐统一的线路方案提供借鉴。 相似文献
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近代建筑遗产是城市文化的积淀。以上海为例,通过对上海外滩建筑群及里弄建筑群的对待策略分析,论证了近代建筑遗产保护对于城市文化传承的重要性。 相似文献
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通过对近年来国内大学城建设的研究,分析了存在的一些典型问题,目的是引起人们对国内大学城建设热潮的反思;论证了"可持续发展"对于大学城建设的重要性。 相似文献
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当今建筑业市场的竞争越来越激烈,而市场竞争的直接袭现为价格的竞争,因而成本管理在提升企业竞标报价也越来越照要.在无法改变日趋严酷的市场竞争环境的背景下,只有通过管理创新,培育成本竞争优势,才能提高企业自身竞争力,赢得市场,最终实现可持续发展. 相似文献
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THE REGIONAL CITY: AN ANGLO-AMERICAN DISCUSSION OF METROPOLITAN PLANNING Edited by Derek Senior Aldine Publishing Company, Chicago, 1966. 183 pp., appendix. $7.50. THE FIFTEENTH WARD AND THE GREAT SOCIETY, AN ENCOUNTER WITH A MODERN CITY by William Lee Miller Houghton Mifflin Co., Boston, 1966. 278 pp. $5.00. 相似文献
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RECONCILING MAN WITH THE ENVIRONMENT, by E. Ashby, Oxford University Press, London, 1978. pp. 104 (£4.25). THE SOCIAL AUDIT POLLUTION HANDBOOK, by M. Frankel. How to assess environmental and workplace pollution, by Macmillan, London, 1978. 210 pp. (Boards £10 hard cover, Paper £3.95) THE MELANESIAN ENVIRONMENT, by J. H. Winslow. National University Press, Canberra, Australia, 1977. xxxiv + 562 pp. (A$12.50) EXPERIENCE, ENVIRONMENT, AND HUMAN POTENTIALS, by H. L. Leff. Oxford University Press, Oxford, 1978. viii + 523 pp. (£6.25) ......AND THE DESERT SHALL REJOICE. CONFLICT, GROWTH, AND JUSTICE IN ARID ENVIRONMENTS, by A. Maass and R. L. Anderson. M. I. T. Press, Cambridge, U.S.A., 1978. 447 pp. (£14.00) THE WORLD FOOD CRISIS, Second edition, by S. A. Marei. Longman, London, 1978. 134 pp. (£3.75) THE UNITED NATIONS SYSTEM: Coordinating its Economic and Social Work, by M. Hill. Cambridge University Press, Cambridge, U.K., 1978. 252 pp. (£11.00) ENERGY RESOURCES, by J. T. McMullen, R. Morgan and R. B. Murray. E. Arnold, London, 1977. 177 pp. (£3.50) PETROLEUM REFINING INDUSTRY ENERGY SAVING AND ENVIRONMENTAL CONTROL, by M. Sittig. Noyes Data Corporation, U.S.A., 1978. ($39.00) NUCLEAR POWER AND THE ENERGY CRISIS; POLITICS AND THE ATOMIC INDUSTRY, by D. Burn. MacMillan for the Trade Policy Research Centre, London, 1978. xix + 348 pp. (£12.00) WORLD HEALTH ORGANISATION, HEALTH IMPLICATIONS OF NUCLEAR POWER PRODUCTION, by the WHO, World Health Organisation, Regional Office for Europe, Copenhagen, 1978. 75 pp. ($4.00) SALMONELLA — THE FOOD POISONER, A Report by a Study Group of the British Association for the Advancement of Science, 1978 (£1.00) IMAGES OF THE URBAN ENVIRONMENT, by D. Pocock and R. Hudson. Macmillan, London and Basingstoke, 1978. x + 181 pp. (£5.95 Boards, £2.50 Paper) CAPITAL AND LAND: Landownership by Capital in Great Britain, by D. Massey and A. Catalano. Edward Arnold, London, 1978.202 pp. (£9.95 Boards, £3.50 Paper) PUBLIC ECONOMICS AND THE QUALITY OF LIFE, by L. Wingo and A. Evans (eds.). J. Hopkins Univ. Press, Baltimore, U.S.A., 1978 327 pp. (£12.50) UNITED NATIONS WATER CONFERENCE: SUMMARY AND MAIN DOCUMENTS: VOL 2 — Water Development, Supply and Management, edited by A. K. Biswas. Pergamon Press, Oxford, 1978. 217 pp. ($28.00) ADVANCED URBAN TRANSPORT, by I. Black, R. Gillie, R. Henderson and T. Thomas. D. C. Heath Ltd., Farnborough, U.K., 1975. 212 pp. (£6.25) ENVIRONMENTAL GEOGRAPHY: A Handbook for Teachers, edited by K. Wheeler and B. Waites. Hart‐Davies Educational, St. Albans, England, 1976. 272 pp. (£7.50) PULP AND PAPER MANUFACTURE: Energy Conservation and Pollution Prevention, by M. Sit‐tig. Noyes Data Corpn., U.S.A., 1977. ($39.00) AN INTRODUCTION TO POPULATION ECOLOGY, by G. E. Hutchinson. Yale University Press, 1978. xi + 260 pp. (£12.60) APPROACHES TO CONTROLLING AIR POLLUTION, by A. F. Friedlaender. M. I. T. Press, Cambridge (Mass.) U.S.A., 1978. x + 465 pp. plus index (£17.50) INDIVIDUAL ONSITE WASTE WATER SYSTEMS, edited by N. I. McClelland. Proceedings of the First National Conference 1974 and Proceedings of the Second National Conference 1975. Ann Arbor Science Publishers Inc, Ann Arbor, U.S.A., 1977 (£12.60 each volume) 相似文献
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Stan Frost Mervyn Richardson Emma Lisa Schipper Roger H. Charlier Derek J. McGlashan Harry Edwards 《The International journal of environmental studies》2013,70(6):771-803
ENVIRONMENTS AND HISTORICAL CHANGE — THE LINACRE LECTURES, edited by Paul Slack, Oxford University Press 1999, ISBN 0–19–823388–4, 196 pages (Hbk, £30). ALTERED GENES — RECONSTRUCTING NATURE: THE DEBATE, edited by Richard Hindmarsh, Geoffrey Lawrence and Janet Norton, Allen and Unwin, 1998, ISBN 1 86448 795 X, 228 Pages (No price supplied). ORGANIZATIONAL MASTERY WITH INTEGRATED MANAGEMENT SYSTEMS, CONTROLLING THE DRAGON, by Michael T. Noble, John Wiley & Sons, United States of America, 2000, IBSN 0–474–38928–5, pp. xvi + 310 index (Hbk, £55). METHODOLOGICAL AND TECHNOLOGICAL ISSUES IN TECHNOLOGY TRANSFER, INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE, A special Report of IPCC Working. Group III, Cambridge University Press, 2000, ISBN 0–521–80494–9, pp. xii + 466 (Pbk $35.95; Hbk, $100). MANAGING SUSTAINABLE DEVELOPMENT, by Michael Carley and Ian Christie, Earthscan, London, 2nd Edition, 2000, ISBN 1–85383–440–8; pp. xiv + 322, index (Pbk, £15.95). LAND OF WATERS, EXPLORATIONS IN THE NATURAL HISTORY OF GUYANA, SOUTH AMERICA, edited by Ro McConnell, The Book Guide Ltd., Lewes. Sussex (UK), 2000, ISBN 1 85776 458 7; pp. xii + 389, index (Hbk, £18.50). SWIMMING WITH DOLPHINS — A HEALING EXPERIENCE, by Lisa Tenzin‐Dolma and Contributors, Quantum Publishers, London, 1997, ISBN 0–572–02364–2; p. 127 (Pbk, £6.99). THE SULFUR PROBLEM CLEANING UP INDUSTRIAL FEED STOCKS, RSC Clean Technology Monographs, by Diane Stirling, The Royal Society of Chemistry, Cambridge, 2000. ISBN 0–85404–541–4; pp. x + 93, index (HbK, £55). A CONSUMER'S GUIDE TO GM FOOD, Green genes and red herrings, by Alan McHughen, Oxford University Press, 2000 pp. viii+ 270 (Pbk, £9.99). THE GREEN GUIDE TO BETTER LIVING, Take care of yourself, your family and the environment, by Ann and Terry Whitefield, Need2Know, Peterborough, England, 2000, ISBN 1–88144–041–3, p. 130 (Hbk, £12.99). CLIMATE FOR CHANGE: NON‐STATE ACTORS AND THE GLOBAL POLITICS OF THE GREENHOUSE, by P. Newell, Cambridge University Press, Cambridge (UK) 2000, p. 222, ISBN 0–521–63250–1 (Hbk, $69.95). PROCEEDINGS OF THE CONFERENCE HELD IN STUTTGART (GERMANY) APRIL 6 and 7, 2000: [THE SEVILLA PROCESS — MOTOR FOR THE ENVIRONMENTAL INDUSTRY], no editor named, Umweltbundeasamt, Berlin, F.R. Germany, 142 pp., softbound (D.M. 20.00). THE WORLD HEALTH ORGANIZATION'S INTER‐ORGANIZATION PROGRAMME FOR THE SOUND MANAGEMENT OF CHEMICALS. CONCISE INTERNATIONAL CHEMICAL ASSESSMENT DOCUMENTS. THE WORLD HEALTH ORGANIZATION'S INTERNATIONAL PROGRAMME ON CHEMICAL SAFETY. ENVIRONMENTAL HEALTH CRITERIA. READING ZOOS: REPRESENTATIONS OF ANIMALS AND CAPTIVITY, by R. Malamud, Macmillan Press, London, 1998, 377 pp. (pbk, £14.99). PORT AND HARBOUR ENGINEERING, edited by Adeian Jarvis, Ashgate Publishing, London, 2000, 456 pp. (Hbk, $156.95). OCEAN'S END; TRAVEL THROUGH ENDANGERED SEAS by C. Woodward, Perseus Books Group, New York, 2000, 300 pp. (Hbk, $26). USING TODAY'S SCIENTIFIC KNOWLEDGE FOR THE BLACK SEA AREA'S DEVELOPMENT TOMORROW, Proceedings of the IOI‐BSOC Leadership Seminar edited by A. S. Bologa and R. H. Charlier. International Ocean Institute. Black Sea Operational Centre, Published by Editura Dada, Constanta, Romania 2000, 210 pp., ill., color, contents 8 1/2 x 11 inches ISBN 973–993 12–9‐4 (Hbk, no price shown; suggestion: send $35 in banknotes, registered mail to A. Bologa, Scientific Director, Romaman Marine Research Institute, Blvd. Mamaia, RO‐3000 Constanta, Romania). 相似文献
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展示,顾名思义,是"以综合物、人、场等要素最佳空间关系为手段,以传达特定信息为目的的展览、演示活动(1)"。由于在特定的环境中,不同于其他纯粹的展示空间,造就了别具特色的教学空间内的展示方式。文章以南开大学主楼为研究对象,重点研究和分析了其流线、灯光、色彩、辅助设施等方面,探讨了教学空间内的展示设计意匠。 相似文献