本文關(guān)鍵詞： P-△效應(yīng) 抗整體倒塌能力評估 殘余側(cè)移 靜力推覆分析 增量動力分析 鋼筋混凝土框架　出處：《蘭州理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：地震是人類面臨的最嚴(yán)重的自然災(zāi)害之一。建筑結(jié)構(gòu)在地震作用下會產(chǎn)生相應(yīng)的內(nèi)力和變形,當(dāng)內(nèi)力和變形達(dá)到結(jié)構(gòu)的倒塌極限狀態(tài)時,建筑結(jié)構(gòu)就會倒塌。在地震作用下,建筑物的倒塌是造成人員傷亡和財(cái)產(chǎn)損失的主要原因。究其原因,建筑結(jié)構(gòu)的倒塌是內(nèi)因和外因共同作用的結(jié)果,如結(jié)構(gòu)構(gòu)件強(qiáng)度和剛度的退化,P-△效應(yīng)及地震動強(qiáng)度等。本文首先分析了P-△效應(yīng)對鋼筋混凝土框架結(jié)構(gòu)抗整體倒塌能力的影響。先對一六層RC框架結(jié)構(gòu)進(jìn)行PKPM建模設(shè)計(jì),根據(jù)設(shè)計(jì)結(jié)果,利用OpenSees分析軟件對其中一榀RC平面框架進(jìn)行了非線性分析,主要工作及結(jié)論如下： (1)區(qū)分不考慮和考慮P-△效應(yīng)兩種情況,對模型進(jìn)行靜力推覆分析,對比兩種情況下的RC框架結(jié)構(gòu)的基底剪力-頂點(diǎn)位移曲線的異同。 (2)區(qū)分不考慮和考慮P-△效應(yīng)兩種情況,選取多條地震動記錄,對模型進(jìn)行增量動力分析,得到結(jié)構(gòu)在上述兩種情況下的抗倒塌能力。 通過對比可以看出,P-△效應(yīng)對結(jié)構(gòu)的倒塌能力有顯著影響,是導(dǎo)致建筑結(jié)構(gòu)倒塌的一個重要原因。 在大震作用下,有些建筑物沒有倒塌但產(chǎn)生了過大的殘余側(cè)移,這些建筑物在災(zāi)后重建修復(fù)的技術(shù)和費(fèi)用都有很大的增加,有些甚至不得不拆除,因此,有效地控制殘余側(cè)移是非常重要的。本文通過選取多條地震動記錄,對RC框架結(jié)構(gòu)的殘余側(cè)移進(jìn)行了分析,主要工作及結(jié)論如下： (1)通過對基于RC框架結(jié)構(gòu)殘余側(cè)移的兩種地震動強(qiáng)度指標(biāo)進(jìn)行對比分析,得出以基本周期的譜加速度作為地震動強(qiáng)度指標(biāo)能夠降低結(jié)構(gòu)響應(yīng)的離散性。 (2)分別分析了特定層的最大層間位移角與殘余層間位移角,得出兩者有很好的相關(guān)性。 (3)分析了特定層的殘余層間位移角隨最大層間位移角的增長過程,得出隨著最大層間位移角的增大,殘余層間位移角增長速率加快。 (4)分別分析了基于彈塑性層間位移角限值和倒塌臨界狀態(tài)最大層間位移角時的殘余層間位移角,得出在結(jié)構(gòu)的最大層間位移角超過彈塑性層間位移角限值之后,結(jié)構(gòu)還有很大的塑性發(fā)展。
[Abstract]:Earthquake is one of the most serious natural disasters that human face. Under earthquake, the building structure will produce corresponding internal force and deformation, when the internal force and deformation reach the limit state of collapse, the building structure will collapse. The collapse of buildings is the main cause of casualties and property losses. For example, the degradation of strength and stiffness of structural members, P- effect and ground motion intensity, etc. In this paper, the influence of P- effect on the overall collapse resistance of reinforced concrete frame structures is first analyzed. First, the PKPM modeling design of a six-story RC frame structure is carried out. According to the design results, the nonlinear analysis of one RC plane frame is carried out by using OpenSees analysis software. The main work and conclusions are as follows:. In this paper, the static force nappe analysis of the model is carried out, and the similarities and differences between the shear and vertex displacement curves of the RC frame structure are compared. (2) in this paper, the incremental dynamic analysis of the model is carried out, and the anti-collapse ability of the structure under the above two conditions is obtained by selecting a number of seismic records and analyzing the incremental dynamics of the model without considering or considering the P- effect. It can be seen from the comparison that the P- effect has a significant influence on the collapse capacity of the structure and is an important reason for the collapse of the building structure. As a result of the earthquake, some buildings did not collapse but resulted in excessive residual sideways, and the technology and cost of reconstruction and restoration of these buildings increased significantly after the disaster, and some even had to be demolished, so, It is very important to control the residual lateral displacement effectively. In this paper, the residual lateral displacement of RC frame structure is analyzed by selecting multiple seismic records. The main work and conclusions are as follows:. 1) by comparing and analyzing two kinds of ground motion intensity indexes based on residual lateral displacement of RC frame structure, it is concluded that spectral acceleration of basic period as index of ground motion intensity can reduce the discreteness of structural response. 2) the maximum interstory displacement angle and the residual layer displacement angle are analyzed, and a good correlation between them is obtained. 3) the growth process of residual layer displacement angle with the maximum interstory displacement angle is analyzed. It is concluded that the increase rate of residual layer displacement angle increases with the increase of the maximum interstory displacement angle. The residual interlayer displacement angle is analyzed based on the limit value of elastic-plastic interstory displacement angle and the maximum interstory displacement angle of collapse critical state, and it is obtained that when the maximum interstory displacement angle of the structure exceeds the elastic-plastic interstory displacement angle limit, There is still a lot of plastic development in the structure.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU375.4

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