本文關(guān)鍵詞： 地震能量 框架結(jié)構(gòu) 推覆分析 耗能能力-需求曲線 延性系數(shù) 能量輸入歷程　出處：《長沙理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：Pushover分析方法作為一種靜力彈塑性分析方法,由于其理論簡單、操作方便并能夠獲得較為理想的分析結(jié)果而受到廣泛的關(guān)注。通過Pushover分析方法設(shè)計(jì)人員可以獲得結(jié)構(gòu)在水平力作用下所產(chǎn)生的一批塑性鉸的位置以及產(chǎn)生塑性鉸的順序和范圍,從而使設(shè)計(jì)人員從更加微觀的角度了解結(jié)構(gòu)的破壞過程,這樣有利于設(shè)計(jì)人員作出更加合理的設(shè)計(jì)方案,同時(shí)與動(dòng)力時(shí)程分析相比Pushover分析方法的計(jì)算量大為縮減,因此其不僅具有很高的理論價(jià)值而且在實(shí)際工程應(yīng)用方面也受到廣大設(shè)計(jì)人員的青睞。然而傳統(tǒng)的Pushover分析方法也存在一些不足之處。首先其只注重了結(jié)構(gòu)的側(cè)向變形而忽略了地震持時(shí)、地震能量輸入特征等因素的影響,其次它所采用的單向加載模式忽略了結(jié)構(gòu)在地震中的累積損傷效應(yīng),并且不同的水平力分布模式甚至不同方向的加載都會(huì)對計(jì)算結(jié)果產(chǎn)生很大的影響。因此本文針對Pushover分析方法的不足之處,將結(jié)構(gòu)的耗能特征參數(shù)與Pushover分析方法相結(jié)合,進(jìn)行了以下研究:1)提出了基于能量的結(jié)構(gòu)延性需求估算方法,即通過單向Pushover分析得到結(jié)構(gòu)的單向耗能能力曲線,通過估算結(jié)構(gòu)的變形能得到其單向耗能需求曲線,并將耗能能力曲線與耗能需求曲線繪制于同一坐標(biāo)系下,通過兩條曲線的交點(diǎn)獲得結(jié)構(gòu)的延性需求;2)在此基礎(chǔ)上,通過討論延性系數(shù)對能量耗散歷程的影響,提出了通過延性系數(shù)估算結(jié)構(gòu)能量輸入歷程參數(shù)的方法;3)基于延性需求與結(jié)構(gòu)能量輸入歷程參數(shù)估算方法,提出了基于變形能輸入歷程特征的改進(jìn)往復(fù)推覆分析方法。從而在考慮變形的基礎(chǔ)上兼顧考慮了地震持時(shí)和地震能量輸入歷程特征對結(jié)構(gòu)損傷的影響。基于上述方法,采用有限元分析軟件OpenSees對一個(gè)3層3跨RC框架和一個(gè)6層3跨RC框架進(jìn)行自適應(yīng)往復(fù)推覆分析,并將結(jié)構(gòu)的最大層間位移角、累積滯回耗能及其分布、瞬時(shí)變形能輸入歷程等反應(yīng)指標(biāo)與動(dòng)力時(shí)程分析結(jié)果進(jìn)行對比的,驗(yàn)證了該改進(jìn)方法的適用性。
[Abstract]:As a static elastic-plastic analysis method, Pushover analysis method is simple in theory. It is easy to operate and can obtain more ideal analytical results and has attracted wide attention. Through Pushover analysis method, designers can obtain the position of a batch of plastic hinges produced by the structure under horizontal force, as well as the order and scope of producing plastic hinges. In order to make the designer understand the damage process of the structure from a more microscopic angle, it is helpful for the designer to make a more reasonable design plan, and at the same time, compared with the dynamic time history analysis, the calculation of the Pushover analysis method is greatly reduced. Therefore, it is not only of high theoretical value but also favored by many designers in practical engineering application. However, the traditional Pushover analysis method also has some shortcomings. Firstly, it only pays attention to the lateral direction of the structure. The deformation ignores the earthquake duration, The characteristics of earthquake energy input and other factors affect it. Secondly, the unidirectional loading mode it adopts ignores the cumulative damage effect of structure in earthquake. And different horizontal force distribution modes and even different directions of loading will have a great impact on the calculation results. Therefore, in this paper, the energy dissipation characteristic parameters of the structure are combined with the Pushover analysis method in view of the shortcomings of the Pushover analysis method. The following studies are carried out: (1) an energy-based method is proposed to estimate the ductility demand of a structure, that is, the one-way energy dissipation curve of the structure is obtained by unidirectional Pushover analysis, and the one-way energy demand curve is obtained by estimating the deformation energy of the structure. The energy dissipation capacity curve and the energy demand curve are drawn in the same coordinate system. The ductility demand of the structure is obtained by the intersection of the two curves. On this basis, the influence of the ductility coefficient on the energy dissipation history is discussed. The method of estimating structural energy input history parameters by ductility coefficient is presented. The method is based on ductility demand and structural energy input history parameter estimation. An improved reciprocating and push-over analysis method based on the characteristics of the input history of deformation energy is proposed, which takes into account the influence of seismic duration and energy input history characteristics on the damage of the structure on the basis of considering the deformation. A 3-story 3-span RC frame and a 6-story 3-span RC frame are analyzed by the finite element analysis software OpenSees. The maximum interstory displacement angle, cumulative hysteretic energy dissipation and its distribution are analyzed. The applicability of the improved method is verified by comparing the transient deformation energy input history with the results of dynamic time history analysis.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU313

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