Analysis of the weightiness of site effects on reinforced concrete (RC) building seismic behaviour: The Adra town example (SE Spain)   总被引：1，自引：0，他引：1  

Manuel Navarro  Francisco Vidal  Takahisa Enomoto  Francisco J. Alcalá  Antonio García‐Jerez  Francisco J. Sánchez  Norio Abeki 《地震工程与结构动力学》2007,36(10):1363-1383

The damage distribution in Adra town (south‐eastern Spain) during the 1993 and 1994 Adra earthquakes (5.0 magnitude), that reached a maximum intensity degree of VII (European Macroseismic Scale (EMS scale)), was concentrated mainly in the south‐east zone of the town and the most relevant damage occurred in reinforced concrete (RC) buildings with four or five storeys. In order to evaluate the influence of ground condition on RC building behaviour, geological, geomorphological and geophysical surveys were carried out, and a detailed map of ground surface structure was obtained. Short‐period microtremor observations were performed in 160 sites on a 100m × 100m dimension grid and Nakamura's method was applied in order to determine a distribution map of soil predominant periods. Shorter predominant periods (0.1–0.3 s) were found in mountainous and neighbouring zones and larger periods (greater than 0.5 s) in thicker Holocene alluvial fans. A relationship T = (0.049 ± 0.001)N, where T is the natural period of swaying motion and N is the number of storeys, has been empirically obtained by using microtremor measurements at the top of 38 RC buildings (ranging from 2 to 9 storeys). 1‐D simulation of strong motion on different soil conditions and for several typical RC buildings were computed, using the acceleration record in Adra town of the 1993 earthquake. It is noteworthy that all the aforementioned results show the influence of site effects in the degree and distribution of observed building damage. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

双侧破裂模型对地震动空间相关性影响的定量研究     

金星  张明宇  王绍博  丁海平  陈超 《地震工程与工程振动》2001,21(1):1-8

本在震源为双侧线状断层破裂模型的假定下，根据震源理论和波谱随空间坐标的展开式，得到了场地两点地震动Fourier谱的表达式Ab(f)=Aa(f)exp(a1δ0 a2δθ，中提出了将双侧破裂模型分解为两个单侧破裂模型计算双侧破裂模型a1和a2的数值方法，以一次地震（M＝6）为例，分析了双侧破裂模型对地震动空间相关性的影响，计算了 a1和a2的实部和虚部以及孔径随震中距，方位角和频率变化的三维图像。  相似文献   

2000年青海玛多6.6 级强震中长期预测回顾   总被引：7，自引：0，他引：7  

门可佩 《国际地震动态》2001,(9):5-10

对2000年青海玛多6．6级强震的跟踪预测过程作了简要回顾和总结，结果显示预测效果较好，同时表明翁文波信息预测理论对青藏高原北部地区强震预测具有较高的实用价值。  相似文献   

Evidence of the dominance of higher-mode surface waves in the lake-bed zone of the Valley of Mexico     

N. M. Shapiro  S. K. Singh  D. Almora  M. Ayala 《Geophysical Journal International》2001,147(3):517-527

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An example of earthquake nucleation of the strong continental earthquakes     

CHEN Xue-zhong  GUO Tie-shuan  ZHU Ling-ren 《地震学报(英文版)》2001,14(2):225-229

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A note on the useable dynamic range of accelerographs recording translation   总被引：2，自引：0，他引：2  

M. D. Trifunac  M. I. Todorovska 《Soil Dynamics and Earthquake Engineering》2001,21(4)

Since the late 1970s, the dynamic range and resolution of strong motion digital recorders have leaped from 65 to 135 dB, opening new possibilities for advanced data processing and interpretation. One of these new possibilities is the calculation of permanent displacement of the ground or of structures, associated with faulting or with non-linear response. Proposals on how permanent displacements could be recovered from recorded strong motion have been published since 1976. The analysis in this paper concludes that permanent displacements of the ground and of structures in the near-field can be calculated provided all six components of strong motion (three translations and three rotations) have been recorded, and the records are corrected for transducer rotation, misalignment and cross-axis sensitivity.  相似文献   

Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes   总被引：1，自引：0，他引：1  

杜学彬  阮爱国  范世宏  郝臻 《地震学报(英文版)》2001,14(3):303-314

IntroductionThe geo-electrical anisotropy before earthquake is of special significance for the prediction of earthquake location and for the research on crustal stress status near the epicentral region. The anisotropy has been studied from various aspects (CHEN, et al, 1983; QIAN, et al, 1985, 1996; LU, et al, 1990a; MAO, et al, 1995; RUAN, et al, 1999). But the anisotropic phenomena presented by geo-electrical data are not practically satisfactory and not clear as compared with the res…  相似文献   

Effect of earthquake ground motions on fragility curves of highway bridge piers based on numerical simulation     

Kazi R. Karim  Fumio Yamazaki 《地震工程与结构动力学》2001,30(12):1839-1856

Fragility curves express the probability of structural damage due to earthquakes as a function of ground motion indices, e.g., PGA, PGV. Based on the actual damage data of highway bridges from the 1995 Hyogoken‐Nanbu (Kobe) earthquake, a set of empirical fragility curves was constructed. However, the type of structure, structural performance (static and dynamic) and variation of input ground motion were not considered to construct the empirical fragility curves. In this study, an analytical approach was adopted to construct fragility curves for highway bridge piers of specific bridges. A typical bridge structure was considered and its piers were designed according to the seismic design codes in Japan. Using the strong motion records from Japan and the United States, non‐linear dynamic response analyses were performed, and the damage indices for the bridge piers were obtained. Using the damage indices and ground motion indices, fragility curves for the bridge piers were constructed assuming a lognormal distribution. The analytical fragility curves were compared with the empirical ones. The proposed approach may be used in constructing the fragility curves for highway bridge structures. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

北京地区一次特大强风过程边界层结构的研究   总被引：21，自引：2，他引：21  

刘小红  洪钟祥 《大气科学》1996,20(2):223-228

利用北京325 m气象塔资料对1993年4月9日北京地区出现的一次特大强风过程的边界层结构（风、温、风切变及阵风特征）进行了分析。随着该次大风的过境，边界层内风场出现数个风速高值中心，高度位于200～300 m，时间间隔1～3 h。伴随上层风速垂直切变和阵风特性。湍流能谱的计算结果表明了大尺度涡旋对边界层湍流微结构的影响。  相似文献   

The　relationships　between　earthquakes　and　positions　of　the　sun　and　moon（Ⅱ）——Sometemporalcharacteristicsoftheaftershocksequencesofstrongearthquakes     

高伟  刘蒲雄  许绍燮  彭克银  吕晓健 《地震学报(英文版)》1996,(3)

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