本文選題：易損性　切入點：張弦梁　出處：《東南大學(xué)》2016年碩士論文

【摘要】：張弦梁結(jié)構(gòu)是一種具有良好應(yīng)用前景的大跨度空間結(jié)構(gòu),雖然具有良好的抗震性能,但地震作用尤其是大地震作用對其仍具有很大的危害性,因此對張弦梁結(jié)構(gòu)進行抗震研究是非常必要的。傳統(tǒng)的抗震分析沒有充分考慮地震動的隨機性和結(jié)構(gòu)參數(shù)的不確定性的影響,難以對結(jié)構(gòu)的抗震性能進行全面準確的判定,而地震易損性分析可以綜合考慮各種隨機或不確定因素,從概率的角度研究結(jié)構(gòu)在不同強度地震作用下發(fā)生破壞的概率。截止目前為止,以張弦梁結(jié)構(gòu)為研究對象的地震易損性分析還很少,規(guī)范中也未列出關(guān)于結(jié)構(gòu)各破壞狀態(tài)的指標界限值�；诖�,本文對單向張弦梁結(jié)構(gòu)進行易損性研究,通過分析單向張弦梁結(jié)構(gòu)在不同地震動強度下的破壞概率,為該類結(jié)構(gòu)的災(zāi)害風險評估、損失預(yù)測提供依據(jù),以利于設(shè)計師們更好的把握該類結(jié)構(gòu)的抗震性能。本文首先對單向張弦梁結(jié)構(gòu)的力學(xué)性能進行了分析,提出了預(yù)應(yīng)力取值的設(shè)計建議值,探討了運用SAP2000程序?qū)埾伊航Y(jié)構(gòu)進行建模的方法,并對其在不同地震波下的地震響應(yīng)差異進行了分析對比。然后以三個不同索梁剛度比的單向張弦梁結(jié)構(gòu)為研究對象(基本模型、強梁模型、強索模型),考慮結(jié)構(gòu)參數(shù)和地震動參數(shù)的隨機性,利用蒙特卡洛抽樣法,為三個模型分別生成100組“結(jié)構(gòu)一地震動”樣本,以跨中最大撓度作為地震需求參數(shù),以地震峰值加速度(PGA)為地震動強度參數(shù),對三個模型的各100個樣本分別進行時程分析,對結(jié)構(gòu)的地震響應(yīng)進行回歸分析,以完成概率地震需求分析。其次,本文針對單向張弦梁結(jié)構(gòu),以跨中撓度作為評估指標,提出了不同破壞狀態(tài)的界定方法,據(jù)此對上述三個模型的各100個樣本,采用豎向靜力彈塑性分析(Push-down分析)方法,進行概率抗震能力分析,分別得到三個模型各級破壞狀態(tài)的撓度界限值的平均值。最后,本文通過大量的計算分析,計算出不同強度地震動作用下結(jié)構(gòu)的破壞概率,得到了三個張弦梁結(jié)構(gòu)的地震易損性曲線,通過易損性曲線的分析比較,驗證了單向張弦梁結(jié)構(gòu)良好的抗震能力,并提出了相應(yīng)的設(shè)計建議：在低強度地震動作用下加強索的剛度更利于提高結(jié)構(gòu)的安全性能,而在高強度地震作用下,加強上弦梁的剛度能更好的降低破壞概率。
[Abstract]:Beam string structure is a kind of large span space structure with good application prospect. Although it has good seismic performance, earthquake action, especially large earthquake action, still has great harm to it. Therefore, it is very necessary to study the seismic behavior of beam string structure. The traditional seismic analysis does not fully consider the randomness of ground motion and the uncertain influence of structural parameters, so it is difficult to judge the seismic performance of the structure comprehensively and accurately. But the seismic vulnerability analysis can consider all kinds of random or uncertain factors synthetically, and study the probability of structure failure under the action of different intensity earthquake from the angle of probability. So far, The seismic vulnerability analysis of beam string structure is rare, and the limit value of each failure state of the structure is not listed in the code. Based on this, the vulnerability of unidirectional beam string structure is studied in this paper. Through analyzing the failure probability of unidirectional beam string structure under different ground motion intensity, it provides the basis for the disaster risk assessment and loss prediction of this kind of structure. In order to help designers to better grasp the seismic performance of this kind of structure. Firstly, the mechanical performance of unidirectional beam string structure is analyzed, and the design suggestion value of prestressing force is put forward. The modeling method of beam string structure with SAP2000 program is discussed. The difference of seismic response under different seismic waves is analyzed and compared, and then three unidirectional beam string structures with different stiffness ratio of cable and beam are taken as the research object (basic model, strong beam model, and so on). Considering the randomness of structural parameters and ground motion parameters, the strong cable model, using Monte Carlo sampling method, generates 100 groups of "structure-ground motion" samples for each of the three models, taking the maximum mid-span deflection as the seismic requirement parameter. Taking the peak acceleration of earthquake (PGA) as the seismic intensity parameter, 100 samples of each of the three models are analyzed by time history analysis, and the seismic response of the structure is regressed to complete the probabilistic seismic demand analysis. In this paper, aiming at the unidirectional beam string structure, taking the mid-span deflection as the evaluation index, a method of defining different failure states is proposed. According to this method, the vertical static elastic-plastic analysis (Push-down analysis) method is used for 100 samples of each of the above three models. Through the probabilistic seismic capacity analysis, the average values of the deflection limit values of the three models at different failure states are obtained. Finally, the failure probability of the structure under the action of different strength ground motion is calculated by a lot of calculation and analysis. The seismic vulnerability curves of three beam string structures are obtained. Through the analysis and comparison of the vulnerability curves, the good seismic capacity of the unidirectional beam string structures is verified. The corresponding design suggestions are put forward: strengthening the stiffness of the cable under the action of low strength ground motion is more conducive to improving the safety performance of the structure, while strengthening the stiffness of the upper chord beam under the action of high intensity earthquake can better reduce the failure probability.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU399

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