【摘要】：震害調(diào)查資料和理論分析都表明，場地的土層條件對地震動特性具有重要的影響。不同場地土層地震動特性分析，在場地效應(yīng)研究和結(jié)構(gòu)抗震設(shè)計中具有重要的意義。土層的地震動特性研究是場地地震反應(yīng)分析和場地安全性評價的重要內(nèi)容，而場地土層的地震動特性參數(shù)的確定直接影響工程結(jié)構(gòu)的抗震設(shè)計的可靠性。隨著地震小區(qū)劃和地震安全性評價工作的廣泛開展，研究不同土層的地震動特性具有重要理論意義和工程應(yīng)用價值。 目前，國內(nèi)外土層地震動特性研究主要是基于土體本構(gòu)關(guān)系的理論分析及計算方法。其中，基于等效線性化模型的計算方法應(yīng)用最為廣泛。應(yīng)用等效線性化計算方法，國內(nèi)外的研究人員開發(fā)了不同的等效線性化計算程序，并在土層地震動特性研究方面取得了一些研究成果。但隨著研究的深入，現(xiàn)有方法局限性日益突出，其可靠性有待更多實際資料驗證，急需通過實際土層地震動研究更深入了解土層地震動特性。 針對上述問題，本文利用日本KiK-net強(qiáng)震臺網(wǎng)的強(qiáng)震觀測記錄和對應(yīng)的臺站場地數(shù)據(jù)，根據(jù)中國《建筑抗震設(shè)計規(guī)范》場地類型劃分標(biāo)準(zhǔn)，建立了適用于中國的土層地震動實測數(shù)據(jù)庫。在數(shù)據(jù)庫基礎(chǔ)之上，利用強(qiáng)震觀測記錄和場地土層特征參數(shù)，統(tǒng)計分析不同場地類別的場地的土層地震動特性，并對不同類別場地的土層地震動特征進(jìn)行對比分析。 本文的主要工作和成果如下： （1）系統(tǒng)總結(jié)了場地土層地震動特性的研究現(xiàn)狀及意義，介紹了常用的土層地震動特性研究方法——基于理論計算的研究方法和基于強(qiáng)震記錄的研究方法。 （2）按照中國《建筑抗震設(shè)計規(guī)范》的場地劃分標(biāo)準(zhǔn)，從日本KiK-net強(qiáng)震臺網(wǎng)中選取11個一類場地和66組強(qiáng)震記錄、20個二類場地和139組強(qiáng)震記錄、30個三類場地和248組強(qiáng)震記錄、9個四類場地和60組強(qiáng)震記錄，共計70個場地和513組強(qiáng)震記錄，建立了適用于中國的土層地震動實測數(shù)據(jù)庫。 （3）利用選取的強(qiáng)震記錄及對應(yīng)的土層條件，分別分析了不同類別場地的土層特征參數(shù)及地震動輸入幅值對PGA放大系數(shù)和反應(yīng)譜放大系數(shù)的影響。 （4）對不同類別的場地地震動特性進(jìn)行對比分析，，給出了不同類別場地土層地震動特性的差異性，并給出了初步的擬合關(guān)系。
[Abstract]:The investigation data and theoretical analysis show that the soil condition of the site has an important effect on the seismic characteristics. The analysis of ground motion characteristics in different sites is of great significance in the research of site effect and seismic design of structures. The study of ground motion characteristics is an important part of site seismic response analysis and site safety evaluation, and the determination of ground motion characteristic parameters directly affects the reliability of seismic design of engineering structures. With the development of seismic microzonation and seismic safety evaluation, it is of great theoretical significance and engineering application value to study the seismic characteristics of different soil layers. At present, the research of soil motion characteristics is mainly based on the theoretical analysis and calculation method of soil constitutive relation at home and abroad. Among them, the calculation method based on equivalent linearization model is the most widely used. Using the equivalent linearization calculation method, researchers at home and abroad developed different equivalent linearization calculation programs, and obtained some research results in the study of soil motion characteristics. However, with the deepening of the research, the limitations of the existing methods are increasingly prominent, its reliability needs to be verified by more practical data, and it is urgent to understand the characteristics of the soil motion more deeply through the study of the actual ground motion. In view of the above problems, this paper makes use of the strong earthquake observation records of the KiK-net strong earthquake network in Japan and the corresponding site data of the stations, and according to the Chinese Standard for Seismic Design of buildings, the site type classification standard is used. A database of soil motion measurement in China is established. Based on the database, the soil motion characteristics of different sites are statistically analyzed by using the observation records of strong earthquakes and the soil layer characteristic parameters, and the soil motion characteristics of different sites are compared and analyzed. The main work and achievements of this paper are as follows: (1) the research status and significance of the ground motion characteristics of the site are summarized systematically. This paper introduces the research methods of soil ground motion characteristics, which are based on theoretical calculation and strong earthquake records. (2) according to the site division standard of China Code for aseismic Design of buildings, From the KiK-net strong earthquake network in Japan, 11 sites and 66 groups of strong earthquake records, 20 second class sites and 139 sets of strong earthquake records, 30 third class sites and 248 sets of strong earthquake records, 9 types of sites and 60 sets of strong earthquake records are selected. A total of 70 sites and 513 sets of strong earthquake records have been established, and a soil ground motion survey database suitable for China has been established. (3) using the selected strong earthquake records and the corresponding soil conditions, The effects of soil layer characteristic parameters and ground motion input amplitude on PGA magnification factor and response spectrum magnification factor of different sites are analyzed respectively. (4) the characteristics of ground motion of different types of sites are compared and analyzed. The difference of ground motion characteristics of different sites is given, and the preliminary fitting relation is given.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P315.9;TU435

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