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1.
山西应县木塔修缮中的问题及对策   总被引:2,自引:0,他引:2  
对目前山西应县木塔修缮中存在的一些认识问题进行了讨论。论证了纳米复合纤维技术用于修缮应县木塔的目标、做法、效果和优势 ,指出用纳米复合纤维技术修缮山西应县木塔是可行的。  相似文献   

2.
山西应县木塔与历史地震   总被引:1,自引:0,他引:1  
山西应县木塔与历史地震的关系是制定修缮应县木塔方案中的一个重要的问题。通过对历史资料的详细研究,对应县木塔的建造时间、场地影响烈度、地震对木塔的影响以及历史上2次加固的情况有了更清晰的认识。在此基础上,对未来的地震烈度给出了最保守的估计,并结合木塔的场地条件和木塔的结构,提出了对应县木塔抗震加固的具体建议。  相似文献   

3.
刘光勋 《山西地震》2002,(4):28-29,42
论述了山西应县木塔在历史地震和工程抗震研究中的地位和意义。并在此基础上 ,阐述了应县木塔维修方案的意见 ,认为应在保持木塔整体结构的前题下 ,针对性地进行加固保护。  相似文献   

4.
用工程测量方法研究了山西应县木塔是否垂直,层与层之间是否处于扭曲状态,塔底座是否在同一高程上等问题。结果表明,木塔处于复杂的顺时针扭曲状态,证实木塔的损坏是历史地震活动造成的。  相似文献   

5.
山西应县木塔变形原因之浅见   总被引:1,自引:0,他引:1  
根据《山西应县木塔损坏的原因及其环境地质研究》课题所发表的成果和资料,对应县木塔变形的原因提出了个人的看法和有关建议  相似文献   

6.
山西应县木塔环境地质及活动断层的研究   总被引:1,自引:0,他引:1  
用工程钻探的方法对山西应县木塔西北侧的活动断层及其环境地质等进行了研究,弄清了地层年代,获取了研究木塔损坏原因的地质样品。  相似文献   

7.
应县木塔的始建年代,目前有两种说法:一是后晋天福年间;一为辽代清河二年。一般认为后者可信。文中对地震造成木塔扭动倾斜的现状作了论述,对地震对木塔的破坏进行了考证,认为木塔的始建年代较一般说法可前推112年。  相似文献   

8.
用物探方法研究了山西应县木塔西北侧的断层状况及塔院区地层的分布状态,地下水流向,地层承载力等。物探结果显示,木塔西北侧存在着现今活动的断层。  相似文献   

9.
介绍了山西应县木塔周围的地理位置,交通,地形,地貌,水文,气象等概况,综述了大同盆地的地质与构造,新构造活动,深部构造等特点,分析了它们的活动对木塔可能造成的影响。  相似文献   

10.
叙述了山西应县木塔损坏的原因及其环境地质研究项目的由来,研究目的,研究了思路与技术方案等。指出这是用地震地质方法为经济建设服务的一次尝试。  相似文献   

11.
采用中国地震局工程力学研究所研制的SLJ-100型三分向力平衡加速度计,进行泉州东、西塔结构脉动反应测试和模态分析,可为同类古塔的测试和研究提供参考;提出了砖石古塔自振周期的计算公式,可为砖石古塔的抗震计算、鉴定及抗震加固提供一定的参考依据.  相似文献   

12.
There is concern regarding the long-term vibration effects caused by metro trains on historic buildings. In this paper, the impact of metro train-induced vibrations on the Bell Tower in Xi’an above two spatially overlapping tunnels was studied.Metro Line 2 has been operational since 2011, and Line 6 is still under construction. To study and control the effect of micro vibrations on the Bell Tower, a metro train–track–tunnel–soil 3D dynamic FE model was developed. The vibration response generated by Line 2 was then predicted, and the influences of train speed on ground vibration were analysed. In addition, a detailed in situ measurement, which helped calibrate the numerical model and determine the dynamic behaviour of timber structures, was performed. Finally, the calibrated models and measured results were used to predict vibrations caused by road traffic and trains from two spatially overlapping metro lines. This was performed under different route schemes and train operation conditions.The results showed that installing steel spring floating slab tracks (FST) and decreasing train speeds had obvious effects on controlling the ground peak particle velocity (PPV). Simulated results from both the input impulse and output response generated by metro Line 2 matched well with actual measurements. If correct designs are employed, it is possible to resolve the vibration problem on historic buildings caused by metro trains.  相似文献   

13.
Eruptions between 1719 and 1721 at Wudalianchi produced two monogenetic strombolian cones Laoheishan and Huoshaoshan and the 65 km2 Shilong lava field. The lavas are unusual in that they are leucite-bearing and lack modal plagioclase. Together with the earlier cones, the historic cones form an orthogonal network with a 4-km average separation. Differences in the morphology of the historic cones are attributed to differences in explosivity. The Shilong lava is predominantly pahoehoe (70%), of compound form, and similar to “plains-style” lavas. It is concluded that there is little possibility that an eruption will take place at Wudalianchi in the near future.  相似文献   

14.
考虑土-结构相互作用的西安钟楼地震反应分析   总被引:2,自引:0,他引:2  
为探讨土-结构相互作用对西安钟楼地震反应的影响,建立了钟楼上部木结构-台基-地基三维有限元模型,基于粘-弹性人工边界条件,利用振型分解反应谱法进行了地震反应分析。结果表明,考虑相互作用木结构2层相对位移反应增大了2.12倍,台基相对于地面间的相对位移增大了44%。因此,在对钟楼结构进行地震反应分析时必须考虑土-结构相互作用。  相似文献   

15.
风电塔是一种顶部有较大偏心质量的高耸薄壁悬臂结构,以某1.5MW水平轴三叶片风电塔为研究对象,重点关注风电塔振动台试验缩尺模型设计。根据量纲分析理论和相似条件,基于模型质量分布和刚度分布等效原则,设计模型塔筒截面及附加质量,保证模型与原型结构自振频率和振型相似。通过对比分析模型动力特性测试结果与原型实测结果,验证了该模型设计方法的合理性,可为同类型风电塔振动台试验设计提供参考与依据。针对该柔性对称高塔模型在动力特性测试中出现的正交耦合振动及拍振现象也进行了详细阐述。  相似文献   

16.
The existence of a valuable historical heritage of the Medieval age in Bologna has motivated a deeper study on the seismic behaviour of the Asinelli Tower, which, beyond being the town symbol, has a structural configuration prone to seismic damage. Accordingly, in the present paper, the seismicity of Bologna is reviewed and a synthesis of the damage observed in the urban area, based on an accurate historical research, is given, with the objective of evaluating the behavior of the Asinelli Tower within the framework of the effects localized in the municipality. An assessment of the tower's stability with respect to compatible seismic events, at least qualitatively, with the region seismicity is then carried out by means of a non-linear dynamic analysis on a simplified model.  相似文献   

17.
S. Mohan  P. K. Sahoo 《水文研究》2008,22(6):854-862
The number of drought events derived from the historic streamflow or rainfall series will be limited and produce results that are not very reliable. This study proposes a drought simulation methodology that uses a long sequence of synthetically generated monthly streamflow/rainfall series, from which it is possible to drive a large sample of drought events and the prediction of drought characteristics will be reliable. The modified Herbst method has been used to identify droughts in the generated streamflow and rainfall series. The drought simulation procedure is illustrated with a case study of the Bhadra reservoir catchment in Karnataka State, India. Monthly droughts were derived from both historic and generated monthly streamflow and rainfall series. The important drought characteristics were determined and the suitable probability distribution for each parameter was arrived at after studying seven different probability models. The use of the probability curves thus derived has been illustrated with examples (referred to in Part 1 as ‘point droughts’). Similarly, the development and application of stochastic models for the prediction of regional drought parameters have been illustrated with examples in the accompanying paper (Part 2: regional droughts). Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

18.
Lateral force, response spectrum and step‐by‐step pushover analyses are performed and compared with the post‐earthquake survey of two Dieh‐Dou buildings seriously affected in the 1999 Chi‐Chi earthquake in Taiwan. The results show that the proposed FE model with finite translational and rotational stiffness can successfully be employed to assess the vulnerability of the frames. The fundamental period of Dieh‐Dou structures is about 1.0 s higher than that calculated by the simplified approach of the codes for regular frames; a modal analysis is, therefore, essential for this typology of structure. The elastic analysis, either lateral force or response spectrum, is shown to be reliable to assess Dieh‐Dou frames when quick results are desired. However, a non‐linear step‐by‐step pushover analysis has the advantage of greater accuracy, as it allows mapping the failure trend and indicating the critical elements. The lateral drifts are compared with the actual observed damage pattern and when the damage level is related to the peak ground acceleration on a vulnerability curve plot, it is shown that the joint failure combined with the lateral drift gives an indication of the global structural behaviour of this historic construction typology. Owing to the unique construction features of the Dieh‐Dou, the joint failure represents also a critical criterion in terms of maximum retention for conservation. Based on a damage level approach, an assessment methodology is suggested that would allow optimizing a strengthening strategy, for protection of these precious structures from future earthquakes while avoiding unnecessary interventions. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

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