本文選題：強柱弱梁　切入點：強柱弱梁系數(shù)限值　出處：《中國地震局工程力學(xué)研究所》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼筋混凝土框架結(jié)構(gòu)在實際大地震中大多沒有實現(xiàn)規(guī)范所預(yù)期的“強柱弱梁”破壞模式，更多的是出現(xiàn)了柱端先出現(xiàn)塑性鉸的情況，這種破壞模式容易造成結(jié)構(gòu)的整層破壞，甚至整體倒塌，從而造成大量人員傷亡及重大財產(chǎn)損失。 為解決這一嚴重問題，通過對“強柱弱梁”這一概念進行深入分析，采用不同的參數(shù)來表征不同層次的含義，提出了強柱弱梁系數(shù)這一新的參數(shù)，來表征柱和梁的相對屈服情況，通過對強柱弱梁系數(shù)進行限值確保結(jié)構(gòu)在地震作用下實現(xiàn)“強柱弱梁”。將結(jié)構(gòu)由“強柱弱梁”破壞模式轉(zhuǎn)換為“強梁弱柱”破壞模式的臨界強柱弱梁系數(shù)定義為強柱弱梁系數(shù)限值，并采用有限元軟件ABAQUS對強柱弱梁系數(shù)限值進行了計算、分析和驗證。本文研究的主要內(nèi)容和結(jié)論如下： 1、總結(jié)鋼筋混凝土框架結(jié)構(gòu)的震害特點，提出強柱弱梁系數(shù)與強柱弱梁系數(shù)限值，并分別給出明確的定義和意義。選取最簡單的鋼筋混凝土框架結(jié)構(gòu)模型，采用有限元軟件ABAQUS對強柱弱梁系數(shù)和強柱弱梁系數(shù)限值的求算方法進行了示范。 2、通過有限元軟件ABAQUS進行大量的數(shù)值模擬，討論強柱弱梁系數(shù)限值在不同條件下的變化規(guī)律。研究發(fā)現(xiàn)：隨軸壓比的提高，強柱弱梁系數(shù)限值的提高先平穩(wěn)后快速；同一結(jié)構(gòu)在雙向地震動輸入時求得的強柱弱梁系數(shù)限值小于單向地震動輸入時求得的強柱弱梁系數(shù)限值；同一地震動調(diào)整不同的峰值加速度對于強柱弱梁系數(shù)限值的影響不大；不同地震動調(diào)整至相同峰值加速度對于強柱弱梁系數(shù)限值的影響在軸壓比較小時不大，在軸壓比較大時影響較大。通過將強柱弱梁系數(shù)限值與規(guī)范中的柱端彎矩增大系數(shù)進行比較，，考察規(guī)范對于“強柱弱梁”問題的體現(xiàn)是否合理，經(jīng)過分析可知，僅就柱梁的相對強弱來看，現(xiàn)行規(guī)范并不能完全保證結(jié)構(gòu)在地震動作用下實現(xiàn)“強柱弱梁”。 3、通過設(shè)計一個5層的鋼筋混凝土框架結(jié)構(gòu)并進行數(shù)值模擬，選取兩條有代表性的地震動，考察了強柱弱梁系數(shù)和強柱弱梁系數(shù)限值規(guī)律的正確性。同時，分析了符合規(guī)范要求的結(jié)構(gòu)在某些地震動作用下可能的破壞模式，指出在某些情況下，結(jié)構(gòu)雖有先形成柱端塑性鉸的危險，可是由于構(gòu)件本身的強度較大，無論是柱端還是梁端可能都不形成塑性鉸。
[Abstract]:Most reinforced concrete frame structures do not realize the failure mode of "strong column and weak beam" as expected in the code in the actual earthquake, and more often the plastic hinge appears at the end of the column, which can easily cause the whole story failure of the structure. Even the whole collapse, resulting in a large number of casualties and heavy property losses. In order to solve this serious problem, the concept of "strong column and weak beam" is deeply analyzed, different parameters are used to represent the meaning of different levels, and a new parameter, the coefficient of strong column and weak beam, is put forward. To characterize the relative yield of columns and beams, By limiting the coefficient of strong column and weak beam to ensure that the structure can realize "strong column and weak beam" under earthquake action, the critical coefficient of strong column and weak beam is defined as the critical mode of structural failure from "strong column and weak beam" to "strong beam and weak column". The limit value of the coefficient of strong column and weak beam, The finite element software ABAQUS is used to calculate, analyze and verify the limit value of the coefficient of strong column and weak beam. The main contents and conclusions of this paper are as follows:. 1. The earthquake damage characteristics of reinforced concrete frame structures are summarized, and the limit values of strong column weak beam coefficient and strong column weak beam coefficient are put forward, and the clear definition and significance are given respectively. The simplest reinforced concrete frame structure model is selected. The finite element software ABAQUS is used to demonstrate the calculation method of the limit value of the coefficient of weak beam of strong column and the coefficient of weak beam of strong column. 2. The finite element software ABAQUS is used to carry out a lot of numerical simulation to discuss the variation law of the limit value of the coefficient of strong column and weak beam under different conditions. It is found that with the increase of axial compression ratio, the increase of the limit value of the coefficient of strong column and weak beam is first stable and then rapid; The limit value of the coefficient of the strong column and the weak beam of the same structure is smaller than the limit value of the coefficient of the strong column and the weak beam when the input of the unidirectional ground motion is obtained, and the influence of the different peak acceleration of the same ground motion on the limit value of the coefficient of the strong column and the weak beam is not significant. The influence of different ground motion adjustment to the same peak acceleration on the limit value of the coefficient of strong column and weak beam is small when the axial compression ratio is small. By comparing the limit value of the coefficient of strong column and weak beam with the increasing coefficient of bending moment at the end of column in the code, we can find out whether the code is reasonable for the problem of "strong column and weak beam". According to the relative strength of column beam, the current code can not completely guarantee that the structure can realize "strong column and weak beam" under the action of ground motion. 3. Through the design and numerical simulation of a five-story reinforced concrete frame structure, two representative ground motions are selected to investigate the validity of the limit law of the coefficient of strong column and weak beam and the coefficient of strong column and weak beam. The possible failure modes of structures which meet the requirements of the code under some ground motions are analyzed. It is pointed out that, in some cases, the structure has the danger of forming plastic hinge at the end of the column first, but the strength of the member itself is large. Plastic hinges may not be formed either at the end of the column or at the end of the beam.
【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】：TU375.4

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