【摘要】：震害調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，在場地效應研究和結構抗震設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分析和場地安全性評價的重要內容，而場地土層的地震動特性參數(shù)的確定直接影響工程結構的抗震設計的可靠性。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用價值。 目前，國內外土層地震動特性研究主要是基于土體本構關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用最為廣泛。應用等效線性化計算方法，國內外的研究人員開發(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強震臺網的強震觀測記錄和對應的臺站場地數(shù)據(jù)，根據(jù)中國《建筑抗震設計規(guī)范》場地類型劃分標準，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)庫基礎之上，利用強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行對比分析。 本文的主要工作和成果如下： （1）系統(tǒng)總結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震記錄的研究方法。 （2）按照中國《建筑抗震設計規(guī)范》的場地劃分標準，從日本KiK-net強震臺網中選取11個一類場地和66組強震記錄、20個二類場地和139組強震記錄、30個三類場地和248組強震記錄、9個四類場地和60組強震記錄，共計70個場地和513組強震記錄，建立了適用于中國的土層地震動實測數(shù)據(jù)庫。 （3）利用選取的強震記錄及對應的土層條件，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)和反應譜放大系數(shù)的影響。 （4）對不同類別的場地地震動特性進行對比分析，，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.
【學位授予單位】：中國地震局工程力學研究所
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P315.9;TU435

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本文編號：2140531