本文關(guān)鍵詞： 可抬起柱腳 耗能段 可替換 連柱鋼支撐 有限元　出處：《蘇州科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：連柱鋼支撐結(jié)構(gòu)是一種新型的雙重抗側(cè)力結(jié)構(gòu),由耗能梁段連接獨立的支撐框架構(gòu)成。在地震作用下由耗能梁段率先進(jìn)入彈塑性耗散地震能量,非耗能構(gòu)件僅在結(jié)構(gòu)變形較大時發(fā)展塑性,具有明顯的屈服時序。震后只需將連柱鋼支撐結(jié)構(gòu)中損傷的耗能段移除,支撐框架便可利用自身的彈性剛度恢復(fù)到原來的位置,修復(fù)成本大大降低。將可抬起柱腳應(yīng)用于連柱鋼支撐結(jié)構(gòu)中,能夠使耗能段在同樣水平荷載作用下的豎向變形增大,耗能段耗散的能量增加,更大程度上實現(xiàn)耗能段集中耗能。為了研究柱腳可抬起的連柱鋼支撐結(jié)構(gòu)的抗震性能,本文應(yīng)用ABAQUS有限元分析軟件模擬分析了柱腳可抬起的連柱鋼支撐結(jié)構(gòu)的抗震性能,主要做了以下研究工作:(1)應(yīng)用SAP2000有限元分析軟件設(shè)計了1棟5開間3跨共15層的連柱鋼支撐結(jié)構(gòu),并選取底部三層中間支撐跨結(jié)構(gòu)作為采用實體單元分析的BASE試件。(2)詳細(xì)介紹了應(yīng)用ABAQUS有限元分析軟件對BASE試件的建模過程,通過對已有的兩個試驗研究的模擬驗證了整個建模過程的可靠性。(3)對比分析了中柱采用可抬起柱腳的試件和柱腳采用普通剛接形式的試件的抗震性能。結(jié)果表明:中柱采用可抬起柱腳的試件的破壞模式更為理想、耗能機(jī)制更加合理、延性以及耗能能力更好。(4)設(shè)計了3組柱腳可抬起的連柱鋼支撐結(jié)構(gòu)試件,分別考察跨度、層高和支撐框架鋼材強(qiáng)度等級對結(jié)構(gòu)抗震性能的影響。結(jié)果表明:當(dāng)結(jié)構(gòu)的高跨比在0.4~0.5范圍內(nèi)取值時,結(jié)構(gòu)的抗震性能可以發(fā)揮到最佳。提高支撐框架鋼材強(qiáng)度等級,試件的極限承載力提高、剩余剛度增大、破壞程度減輕,有利于震后修復(fù),但試件延性降低。(5)利用等能量原理將柱腳可抬起的連柱鋼支撐結(jié)構(gòu)的正向骨架曲線簡化為三折線,分別考察跨度、層高和支撐框架鋼材等級對結(jié)構(gòu)抗震性能的影響,確定結(jié)構(gòu)耗能段可替換的層間側(cè)移角范圍。結(jié)果表明:對于耗能段采用Q235B級鋼,支撐框架采用Q345B級鋼的柱腳可抬起連柱鋼支撐結(jié)構(gòu)可以取耗能段可替換層間側(cè)移角的下限為1/550,上限為1/130。對于支撐框架分別采用Q235B、Q390B、Q420B、Q460C、Q550C鋼材的試件的耗能段可替換層間側(cè)移角范圍的上限分別下降了31%、提高了4%、19%、32%、42%。
[Abstract]:The column steel bracing structure is a new type of double lateral force resisting structure, which is composed of an independent bracing frame connected with the energy dissipation beam section. Under the earthquake action, the energy dissipation beam section first enters the elastic-plastic dissipative seismic energy. The non-energy dissipation member develops plasticity only when the deformation of the structure is large, and has obvious yield sequence. After the earthquake, it is only necessary to remove the damaged energy dissipation section of the column steel braced structure. The braced frame can be restored to its original position by using its elastic stiffness, and the repair cost is greatly reduced. It can increase the vertical deformation of the energy dissipation section under the same horizontal load, and increase the energy dissipation of the energy dissipation section. In order to study the seismic behavior of the column steel braces which can be lifted with column foot, the concentrated energy dissipation of the energy dissipation section is realized to a greater extent. In this paper, ABAQUS finite element analysis software is used to simulate and analyze the seismic behavior of the column steel braced structure which can be lifted with column foot. The main research work is as follows: (1) using SAP2000 finite element analysis software, we design a 15 story steel supporting structure with 5 open spaces and 3 spans. And select the bottom three layers of intermediate bracing cross-structure as the BASE specimen with solid element analysis. The modeling process of BASE specimen using ABAQUS finite element analysis software is introduced in detail. The reliability of the whole modeling process is verified by the simulation of two existing experiments. The results show that the failure mode of the specimens with the raised column foot is more ideal than that of the specimen with the ordinary rigid joint in the middle column, and the seismic behavior of the specimen with the lifting column foot is compared and analyzed. The energy dissipation mechanism is more reasonable, the ductility and energy dissipation ability are better. The influence of story height and steel strength grade of braced frame on the seismic performance of the structure. The results show that when the ratio of height to span of the structure is in the range of 0.4 ~ 0.5. The ultimate bearing capacity of the specimens is increased, the residual stiffness is increased, and the damage degree is reduced, which is beneficial to the post-earthquake repair. However, the ductility of the specimen is reduced. 5) the forward skeleton curve of the column steel braced structure which can be lifted with column foot is simplified to three broken lines by using the principle of equal energy, and the span is investigated separately. The influence of story height and steel grade of braced frame on the seismic performance of the structure and the range of interlayer lateral displacement angle of the energy dissipation section of the structure are determined. The results show that Q235B grade steel is used for the energy dissipation section. The column foot of Q345B grade steel can be lifted up in the bracing frame. The lower limit of the displacement angle of the energy dissipation section can be taken as 1/550. The upper limit is 1 / 130. For the supporting frame, Q235BU Q390BU Q420BU Q460C is used respectively. For Q550C steel, the upper limit of the range of alternative interlayer lateral displacement angle of the test piece of Q550C steel is decreased by 31and the upper limit of the displacement angle range has been decreased by 31s, which has increased the energy consumption section of Q550C steel.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU973.31

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