本文選題：異形柱框架　切入點(diǎn)：連續(xù)倒塌　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：連續(xù)倒塌是指由于意外事件的突然發(fā)生造成結(jié)構(gòu)的子結(jié)構(gòu)損傷或者結(jié)構(gòu)局部破壞,繼而導(dǎo)致連鎖反應(yīng)的產(chǎn)生,引起破壞向結(jié)構(gòu)的其它部分?jǐn)U散,最終使結(jié)構(gòu)發(fā)生大范圍的倒塌破壞。異形柱框架結(jié)構(gòu)相對(duì)于傳統(tǒng)矩形柱框架結(jié)構(gòu),由于其柱肢薄弱且節(jié)點(diǎn)容易發(fā)生破壞,在意外荷載作用下更容易發(fā)生連續(xù)倒塌。本文以異形柱結(jié)構(gòu)為研究對(duì)象,對(duì)空間異形柱框架進(jìn)行撤柱試驗(yàn),并進(jìn)行結(jié)構(gòu)抗倒塌的動(dòng)力響應(yīng)分析。為研究混凝土異形柱框架的抗連續(xù)倒塌動(dòng)力響應(yīng),進(jìn)行了一個(gè)1/3縮尺比的兩層3×2跨混凝土異形柱空間框架撤柱試驗(yàn),試驗(yàn)共包含兩個(gè)工況:底層角柱撤除試驗(yàn)和短邊中柱撤除試驗(yàn)。試驗(yàn)結(jié)果顯示兩工況下,與失效柱相連梁轉(zhuǎn)角最大值分別為1.45×10-4rad和1.46×10-4rad,均小于倒塌判定標(biāo)準(zhǔn)值0.105rad,表明混凝土異形柱框架結(jié)構(gòu)在底層框架柱撤除后具有較好的抗倒塌性能。基于有限元軟件ANSYS/LS-DYNA建立混凝土異形柱試驗(yàn)框架的有限元分析模型,采用替代路徑法進(jìn)行底層關(guān)鍵柱失效的結(jié)構(gòu)非線性動(dòng)力分析。通過(guò)對(duì)比分析失效柱柱頂豎向位移及鋼筋應(yīng)變的計(jì)算值和試驗(yàn)值,二者吻合較好,表明基于ANSYS/LS-DYNA軟件采用替代路徑法研究異形柱空間框架的抗連續(xù)倒塌性能是合理的。在此基礎(chǔ)上研究試驗(yàn)兩種不同撤柱工況下與失效柱相連梁端混凝土應(yīng)變變化情況,結(jié)果顯示兩工況的梁端混凝土應(yīng)力值均未超過(guò)混凝土軸心抗拉強(qiáng)度或軸心抗壓強(qiáng)度,混凝土不會(huì)發(fā)生開裂或壓碎,與試驗(yàn)中觀察到的撤柱后未發(fā)現(xiàn)裂縫是一致的,進(jìn)一步說(shuō)明利用LS-DYNA進(jìn)行數(shù)值模擬分析是可靠的。在此基礎(chǔ)上,利用ANSYS/LS-DYNA軟件對(duì)試驗(yàn)異形柱空間框架進(jìn)行底層內(nèi)柱突然失效工況和兩個(gè)相鄰框架柱同時(shí)失效的三種最可能工況下的結(jié)構(gòu)非線性動(dòng)力分析,分析表明兩個(gè)相鄰框架柱突然失效后剩余框架不會(huì)發(fā)生連續(xù)倒塌,但會(huì)產(chǎn)生顯著的動(dòng)力效應(yīng)。
[Abstract]:Continuous collapse refers to the damage to the substructure or local damage of the structure caused by the sudden occurrence of an accident, which leads to a chain reaction, which causes the damage to spread to other parts of the structure. Compared with the traditional rectangular column frame structure, the special-shaped column frame structure is vulnerable to damage because of its weak column limb and the joint. Continuous collapse is more likely to occur under the action of accidental load. In this paper, the special shaped column structure is taken as the research object, and the column withdrawal test is carried out on the spatial special-shaped column frame. In order to study the dynamic response of concrete special-shaped column frame against continuous collapse, a two-story 3 脳 2 span spatial frame with a scale ratio of 1/3 is carried out. The test consists of two working conditions: the bottom corner column removal test and the short side column removal test. The maximum rotation angles of beams connected with failure columns are 1.45 脳 10 ~ (-4) rad and 1.46 脳 10 ~ (-4) radrespectively, which are less than the standard value of collapse determination 0.105 rad. it shows that the concrete frame structure with special-shaped columns has better anti-collapse performance after the removal of the bottom frame column. Based on the finite element software ANSYS/LS-DYNA, the structure is built on the basis of the finite element software ANSYS/LS-DYNA. Finite element Analysis Model of Test frame for Special shaped column of Vertical concrete, The structural nonlinear dynamic analysis of the failure of the bottom key column is carried out by using the alternative path method. The calculated and experimental values of the vertical displacement and the strain of the steel bar on the top of the failure column are compared with each other, and the results are in good agreement with each other. The results show that it is reasonable to study the continuous collapse resistance of spatial frame with special-shaped columns based on the alternative path method based on ANSYS/LS-DYNA software. On this basis, the strain variation of concrete at the end of the beam connected to the failure column under two different column withdrawal conditions is studied. The results show that the stress values of concrete at the end of the beam under two working conditions are not higher than the axial tensile strength or compressive strength of the concrete, and the concrete will not crack or crush, which is consistent with the observed cracks after the column withdrawal. It is further proved that the numerical simulation analysis using LS-DYNA is reliable. Using ANSYS/LS-DYNA software, the nonlinear dynamic analysis of the structure under the three most probable failure conditions of the inner column of the bottom layer and the failure of two adjacent columns at the same time is carried out on the spatial frame with special shaped columns. The analysis shows that the residual frame will not collapse continuously after the failure of two adjacent frame columns, but it will have significant dynamic effect.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU398.9;TU311.3

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