Seismic code analysis of multi-storey asymmetric buildings

Static torsional provisions in most seismic codes require that the lateral force at each floor level be applied at some distance from the reference centre at that floor. However, codes do not specify how to determine the locations of these centres. As a result, several different definitions of the reference centres are being used to implement the code analysis. This investigation examined how the results using various reference centres differ and which of these centres would lead to results that are in agreement with those of dynamic analysis. For this purpose three different buildings ranging form torsionally stiff to torsionally flexible were analysed. It was shown that for the class of buildings studied in this investigation that although the locations of the reference centres were quite different, the results were very similar and nearly independent of the reference centre. Comparison of results calculated from static code equivalent lateral force procedures and results from dynamic response spectrum analyses showed that the static code procedures led to design forces very close (flexible wall) or slightly conservative (stiff wall) when compared to the dynamic analysis for the torsionally stiff building. However, the static code procedures significantly underestimated the design forces of the stiff walls and significantly overestimated the design forces of the flexible walls for the torsionally flexible buildings. © 1998 John Wiley & Sons, Ltd.     

新一轮土地利用总体规划修编的思考与探索--以济南市土地利用总体规划修编为例

我国土地利用总体规划编制的历史较短,经验尚不丰富,有关基础理论和编制方法还处于探索阶段。结合新一轮规划修编情况,认为应该注意基础数据的准确性,要有对上一轮规划实施情况的科学评价、对社会经济发展战略的科学定位和对各类用地规模的科学预测,要注意与城市规划等其他规划之间的协调与衔接,还要注重规划修编的开放性等问题。济南市在规划修编过程中总结以往规划存在的问题,提出了动态规划方案的新思路、控制指标的弹性管理方法及规划实施的机制创新途径。     

高海拔地区送电线路GPS测量的问题及解决办法

以青藏直流联网工程测量坐标系统建立为例,分析了高原地区线路测量中坐标系统建立的变形因素,以及解决变形的几种方法和一些细节问题,提出了为方便高原地区线路测量中坐标系统建立的一些应用经验,以此为同行提供有益参考。     

寿光市排水规划地形图测绘和排水管线普查项目方案设计

通过对已有成果资料的分析利用和合理选用起算数据,按照技术要求,采用GPS静态测量技术、四等水准测量方式布设控制网和RTK动态测量技术、全站仪进行地形和管线测量,以及内外业一体化成图方式进行方案设计,并对作业中的技术指标及注意事项作了阐述,从而有效指导了项目的顺利实施,加快了作业进度,提高了成果质量。     

新世纪地勘产业组织构建的理论思考

计划经济体制下形成的传统地勘产业组织 ,即地勘单位及科研院所 ,不能从根本上适应社会主义市场经济条件下的地质勘查市场的需求。现有的改组、改造方案存在较大的局限性 ,我们不得不思考一个严峻的课题 ,那就是地勘单位的灭与生。现代地勘产业组织应是投资商、作业商、咨询商三足支撑 ,多种经济成分共存的产业组织体系 ,并将项目经理部建设作为工作重点 ,虚拟组织结构建设作为发展方向。为此应建设和培育现代地勘产业组织的生存与发展的支撑条件 :即形成地质勘查法规的立法体系 ,塑造地质勘查市场的微观运行机制 ,塑造地质勘查产品的质量管理体系 ,建立地勘行业的风险管理体系 ,建设地勘产业的信息网络 ,加大地勘专业市场知识的宣传普及力度。     

河北省馆陶县地下水压采新模式

河北省水资源严重匮乏,由于连年超采地下水已引发了严重的环境地质问题.对馆陶县地下开采现状,指出地下水压采新模式.通过综合措施即种植结构调整、工程措施、管理制度措施、咸水微咸水合理利用等,开源与节流并举,使该区域水资源能够支撑其社会、经济和环境的可持续发展.     

Megacities – megarisks

We review the definitions, population trends, and characteristics of megacities. Characteristics of megacities are, apart from their size, their complexity in terms of administration, infrastructure, traffic, etc., and at the same time the speed of change. Vulnerabilities and risk potential are discussed using the examples of Mexico City and Mumbai. We present the experience accumulated in the 6 years work of the Earthquakes and Megacities Initiative (EMI, ) with more than 20 large cities around the world, mostly located in the developing world. On this background we analyze obstacles that keep megacities from developing an efficient approach towards disaster mitigation and define a strategy that might overcome these problems. The key element of this strategy is the development of a Disaster Risk Management Master Plan (DRMMP) for cities. Currently the Istanbul Earthquake Master Plan (IEMP) serves as best example for an appropriate strategy for disaster reduction in megacities.     

南宁市适应风气候环境总体规划的建议

城市总体规划应当分析研究风气候环境，特别是风向、风频等参数，注意考虑污染问题的影响；通过分析南宁市的风气候环境资源特征，提供一些建议，以便有关部门考虑南宁市城市总体规划或其修编时采用，为建设和谐生态首府城市献策。     

浅论法治与德治的结合与建设

市场经济的发展为法治与德治的统一提供了社会条件。全面加强社会主义法制建设和道德建设对于发展社会主义市场经济 ,建设有中国特色的社会主义具有重大的意义     

工程降水设计的一种新方法

对目前通用的地下水动力学方法进行工程降水设计分析,指出其几点不足,据几年来的工程降水实践,提出一种工程降水的新方法－有效半径法。该方法根据四条基本原则,利用单井不同降深的有效半径,进行井距、井数的计算,在此基础上利用计算机进行降水方案的优化,从而确定出最佳方案。该方法在长春市粘性土几个降水工程中应用,都取得了满意的效果。