本文選題：單層球面網(wǎng)殼 + 纖維損傷　； 參考：《北京工業(yè)大學》2015年博士論文

【摘要】：單層球面網(wǎng)殼由于其輕盈,優(yōu)美等眾多優(yōu)點,被廣泛應用于當代大跨空間結(jié)構(gòu)之中。然而近年來地震的頻發(fā),單層球面網(wǎng)殼的動力失效問題成為當前研究熱點。本文主要從以下幾個方面進行深入探討:考慮材料損傷,從能量角度探索單層球面網(wǎng)殼動力失效判別準則;進行單層球面網(wǎng)殼動力失效的全過程試驗;建立結(jié)構(gòu)損傷演化模擬的隱式算法,研究動力作用下單層球面網(wǎng)殼損傷的發(fā)展過程及結(jié)構(gòu)動力失效的全過程,最后結(jié)合計算機模擬結(jié)果及試驗結(jié)果,研究提高單層球面網(wǎng)殼抗失效能力的方法。主要工作與結(jié)論有:(1)建立了基于桿件纖維損傷的結(jié)構(gòu)損傷演化模擬方法對于桿件的材料損傷,結(jié)合ABAQUS中材料子程序的FRTRAN接口,考慮材料的損傷累積過程,編寫材料子程序。通過把空間桿件截面劃分為多個積分點,實現(xiàn)了截面纖維損傷計算,進而從微觀角度觀察材料損傷的變化過程。根據(jù)纖維失效給出桿件剛度變化并形成了隱式算法。結(jié)合已有的幾個試驗結(jié)果,進行計算機模擬,驗證了材料子程序和模擬方法的正確性。從而為進一步研究單層球面網(wǎng)殼的動力損傷過程奠定了基礎。(2)進行了基于時效的單層球殼損傷演化及震后承載力分析采用本文建立的結(jié)構(gòu)損傷演化模擬方法,對一單層球面網(wǎng)殼模型進行強震作用下的響應分析。結(jié)果表明:隨著地震作用的持續(xù),單層球面網(wǎng)殼失效具有從單元體破壞開始,逐步發(fā)展的特點;探討了結(jié)構(gòu)損傷以致失效的演化規(guī)律,給出了單層球面網(wǎng)殼的失效模式。進一步通過對不同時長、不同PGA情況下單層球殼極限承載力分析,得出對于震后結(jié)構(gòu)極限承載力的評估,需要同時考慮地震峰值的大小和作用時長的結(jié)論,并擬合出單層球面網(wǎng)殼震后承載力和多參數(shù)之間的函數(shù)關(guān)系,這對震后結(jié)構(gòu)的安全評定,具有重要意義。(3)提出了基于動能的單層球面網(wǎng)殼動力失效判別準則振動過程中結(jié)構(gòu)動能必然發(fā)生波動,而發(fā)生動力失效時結(jié)構(gòu)動能必將發(fā)生劇烈變化。為此,本文避開采用塑性應變能或最大位移通過統(tǒng)計作為失效判別指標,從動能的角度去探討一種判別單層球面網(wǎng)殼動力失效的準則。通過研究動能增量的變化形式與單層球面網(wǎng)殼失效可能性的關(guān)系,結(jié)合動能增量振動曲線,提出了單層球面網(wǎng)殼動力失效判別準則。該準則簡潔、明了,并且有利于程序的實現(xiàn)。算例分析表明該準則對于單層球面網(wǎng)殼穩(wěn)定破壞和強度破壞均有效。(4)基于Python開發(fā)ABAQUS,實現(xiàn)了結(jié)構(gòu)失效自動判斷功能通過ABAQUS的腳本接口,該接口在Python語言的基礎上進行的定制開發(fā),采用Python語言編寫的程序,通過腳本接口直接和軟件內(nèi)核進行對話。結(jié)合基于動能的單層球面網(wǎng)殼失效判別準則,編寫基于IDA的計算程序,從而實現(xiàn)ABAQUS在單層球面網(wǎng)殼動力計算過程中的結(jié)構(gòu)失效自動判斷功能。(5)成功地實現(xiàn)了單層球面網(wǎng)殼動力失效全過程試驗通常由于動力破壞的突然性而難以通過試驗得到結(jié)構(gòu)失效的全過程。本文利用現(xiàn)有的試驗室條件,針對一個單層球面網(wǎng)殼的振動臺試驗,通過低頻調(diào)幅加載獲得桿件陸續(xù)進入塑性的規(guī)律,從而可評估結(jié)構(gòu)的損傷程度;通過基頻簡諧加載獲得節(jié)點位移時程,從而實現(xiàn)了結(jié)構(gòu)失效全過程的監(jiān)測。并通過該試驗驗證了本文建立的結(jié)構(gòu)損傷演化模擬方法和單層球面網(wǎng)殼動力失效判別準則。(6)提出了提高單層球面網(wǎng)殼抗失效能力的措施試驗與數(shù)值模擬均表明在強震作用下,單層球面網(wǎng)殼的環(huán)向桿件最先進入塑性,而且由于存在彎矩的作用均是桿件根部先進入塑性。本著延緩結(jié)構(gòu)塑性發(fā)展的原則,通過多種工況對比分析不同環(huán)桿加強后結(jié)構(gòu)的塑性發(fā)展情況,最后得出了對于施威德勒型網(wǎng)殼加強跨度1/4處的環(huán)桿和加大桿件根部均為有效的措施。根據(jù)本文提出的動力失效判別準則,采取措施后結(jié)構(gòu)失效時刻得以明顯延遲。
[Abstract]:Single layer spherical reticulated shell has been widely used in modern large span space structure because of its advantages of lightness, grace and so on. However, in recent years, the dynamic failure of single layer spherical reticulated shell has become a hot topic in recent years. This paper is mainly to discuss the following aspects: considering material damage and exploring single layer from the angle of energy The dynamic failure criterion of the spherical reticulated shell, the whole process test of the dynamic failure of the single layer reticulated shell, the implicit algorithm of the structural damage evolution simulation, the development process of the damage of the single layer spherical reticulated shell under dynamic action and the whole process of the dynamic failure of the structure are studied. Finally, the improvement of the single layer is studied in combination with the simulation results and the experimental results. The main work and conclusions are as follows: (1) a structural damage evolution simulation method based on rod fiber damage is established for material damage of rod, combined with the FRTRAN interface of the material subroutine in ABAQUS, considering the damage accumulation process of the material, and compiling the subprogram of material. Several integral points are used to calculate the fiber damage of the section, and then the change process of material damage is observed from the microcosmic angle. According to the fiber failure, the change of the stiffness of the rod is given and the implicit algorithm is formed. The computer simulation is carried out with several experimental results. The correctness of the material subprogram and the simulation method is verified. The study of the dynamic damage process of single layer spherical reticulated shell has laid the foundation. (2) the damage evolution of single layer spherical shell based on aging and the analysis of post earthquake bearing capacity are used to simulate the structural damage evolution in this paper, and the response analysis of a single layer spherical reticulated shell model under strong earthquake action is carried out. The results show that with the continuous earthquake action, the single spherical reticulated shell model is subjected to the response analysis. The failure of the layer spherical reticulated shell has the characteristics of the beginning of the failure of the unit body and the gradual development. The evolution law of the structural damage and failure is discussed. The failure mode of the single layer spherical reticulated shell is given. The ultimate bearing capacity of the single layer spherical shell in different time length and different PGA conditions is analyzed, and the evaluation of the ultimate bearing capacity of the structure after the earthquake is obtained. It is necessary to take the conclusion of the magnitude of the earthquake peak and the length of action at the same time, and fit the function relation between the post earthquake bearing capacity and the multi parameters of the single layer spherical reticulated shell, which is of great significance to the safety assessment of the post earthquake structure. (3) the dynamic energy of the dynamic failure of the single layer spherical reticulated shell based on the kinetic energy is proposed. In this paper, a criterion for determining the dynamic failure of a single layer reticulated spherical reticulated shell is discussed from the point of view of kinetic energy. The relationship between the failure possibility of the reticulated shell and the kinetic energy increment vibration curve, a criterion for the dynamic failure of the single layer spherical reticulated shell is proposed. The criterion is concise, clear and beneficial to the realization of the program. The example analysis shows that the criterion is effective for the stability and strength failure of a single layer spherical reticulated shell. (4) the structure is developed based on Python, and the structure is realized. The function of automatic failure judgment is made through the script interface of ABAQUS. The interface is developed on the basis of the Python language, the program written in the Python language is written in the language, and the software kernel is dialogically dialogically with the script interface. It combines the failure criterion of the single layer spherical reticulated shell based on the kinetic energy, and writes the computing program based on the IDA to realize the AB AQUS in the dynamic calculation of the single layer spherical reticulated shell. (5) the whole process test of the dynamic failure of the single layer spherical reticulated shell is successfully realized. The whole process of structural failure is difficult to be obtained by the test of the dynamic failure. The shaking table test of the shell is used to obtain the plastic law of the member through the low frequency amplitude modulation loading, thus the damage degree of the structure can be evaluated. The displacement time history of the node is obtained through the basic frequency simple harmonic loading, thus the whole process of structural failure is monitored. The simulation method and single layer of structural damage evolution established in this paper has been verified by the experiment. The criterion for dynamic failure of a spherical reticulated shell. (6) the test and numerical simulation of improving the anti failure ability of a single-layer spherical reticulated shell show that the ring member of a single-layer spherical reticulated shell is the first to enter the plastic under strong earthquake action, and the effect of the moment is the advanced plasticity of the root of the member. In principle, through a variety of working conditions, the plastic development of the reinforced structure with different ring bars is analyzed. Finally, the effective measures are obtained for the reinforcement of the ring rod and the root of the member at 1/4 span of the schwedeler type reticulated shell. According to the dynamic failure criterion proposed in this paper, the failure time of the structure is obviously delayed.

【學位授予單位】：北京工業(yè)大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TU399;TU317

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