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A Simple Site-specific Method for Estimating Nonlinear Site Effects
http://hdl.handle.net/10487/15175
http://hdl.handle.net/10487/15175622d1ece-061c-48e4-a4c7-0b7d44d6db2e
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工甲231 内容の要旨および審査の結果の要旨.pdf (176.9 kB)
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工甲231 本文要約 (97.4 kB)
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工甲231 本文 (6.3 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2018-06-12 | |||||||
| タイトル | ||||||||
| タイトル | A Simple Site-specific Method for Estimating Nonlinear Site Effects | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | jpn | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 著者 |
張, 海仲
× 張, 海仲
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | It has long been recognized that site effects should be considered in the seismic design of structures. Generally, there are two categories of methods for estimating site effects for design purpose, namely: empirical and theoretical. The empirical methods are developed based on site classification and statistical analysis of seismic records. In most seismic codes throughout the world, such as the Eurocode 8 and the International Building Code, the empirical methods are adopted for estimating site effects. But, for some regions such as Japan, site conditions are known to vary significantly, site effects can hardly be represented using several site classes. For such regions, it has been suggested that site effects be evaluated using theoretical methods according to specific sites instead of rough site classifications, by some codes including the Japanese Seismic Code. A number of simple theoretical methods have been developed to estimate site effects of specific sites. Almost all of these methods are developed theoretically based on a simple soil model, a singlelayer soil profile on bedrock. And, for multi-layer soil profiles, the multiple soil layers are approximated as an equivalent single layer by roughly weighted averaging the soil shear wave velocity and density. However, the weighted averaging ignores the layer sequence and can't properly consider properties of every soil layers. It can be easily inferred that, the error of estimated site effects will increase as variation degree of the soil properties along the depth increases. What's worse, the method using the weighted averaging is found to significantly underestimate site effects, when the impedance contrast of the soil layers is large, which is dangerous for the seismic design of structures. The main objective of the present research is to develop a new simple site-specific method for estimating site effects of multi-layer soil profiles. This dissertation consists of six chapters. The contents of each chapter are briefly described as follows. In Chapter 1, the background, objective and organization of this study are described. In Chapter 2, a function for estimating site effects characterized as respop.se spectral ratio (RSR) is developed. To develop this function, the RSR and Fourier spectral ratio (FSR) are compared, based on ground-motion records in Section 2.2 and random vibration theory in Section 2.3. The developed function for RSR in Chapter 2 consists of two basic parameters, namely the fundamental period and first resonance peak. In Chapter 3, three simple methods for estimation of the first resonance peak of layered soil profiles are developed. In Chapter 4, a simple procedure to consider the soil nonlinear behavior in estimation of the site effects is developed. During the application of this method, the first mode shape is necessary; a simple method for estimating the first mode shape oflayered soil profiles is proposed, in Section 4.3. In Chapter 5, the consideration of estimating site effects in Chapter 3 is extended to calculate the fundamental period of a multiple-degree-of-freedom system. In Chapter 6, conclusions obtained by this study are summarized. | |||||||
| 書誌情報 |
p. i-126, 発行日 2018 |
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| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 出版者 | ||||||||
| 出版者 | 神奈川大学 | |||||||
| 資源タイプ | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Thesis or Dissertation | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 32702 | |||||||
| 学位授与機関名 | 神奈川大学 | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2018-03-31 | |||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 博甲第231号 | |||||||
