本文關(guān)鍵詞： 鋼節(jié)點(diǎn) 延性 單元剛度矩陣 低周循環(huán) 時程分析　出處：《西南石油大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在美國的北嶺和日本的阪神發(fā)生罕遇地震之前,鋼結(jié)構(gòu)梁柱節(jié)點(diǎn)一直被各國專家學(xué)者認(rèn)為是具有良好抗震性能的。地震發(fā)生后,多數(shù)節(jié)點(diǎn)發(fā)生了脆性破壞,各國學(xué)者開始著手優(yōu)于一般剛性節(jié)點(diǎn)的具有抗震性能的延性節(jié)點(diǎn)。在保證“強(qiáng)柱弱梁”的前提下,提出了削弱式節(jié)點(diǎn)和加強(qiáng)型節(jié)點(diǎn)兩種形式。這里結(jié)合狗骨式節(jié)點(diǎn)和擴(kuò)翼式節(jié)點(diǎn),對前人提出的擴(kuò)翼狗骨式節(jié)點(diǎn)進(jìn)行驗(yàn)證,并與前兩者進(jìn)行對比,分析各節(jié)點(diǎn)的優(yōu)劣。 通過結(jié)構(gòu)力學(xué)的矩陣位移法,對所研究結(jié)點(diǎn)的各個力分量進(jìn)行疊加,根據(jù)前人得出的普通節(jié)點(diǎn)(Normal Connection)、狗骨式節(jié)點(diǎn)(Reduced Beam Section Connection),得出擴(kuò)翼式節(jié)點(diǎn)(Widened Flange Connection)、擴(kuò)翼狗骨式節(jié)點(diǎn)(Flange Reinforced Dog-bone Connection)的梁單元剛度矩陣,得出削弱式節(jié)點(diǎn)的剪切剛度系數(shù)與抗彎剛度系數(shù)受節(jié)點(diǎn)剛度變化的影響很大,節(jié)點(diǎn)的整體穩(wěn)定性與平面外穩(wěn)定性計算不可忽略。 采用ABAQUS軟件進(jìn)行有限元模擬,根據(jù)以上介紹的幾個鋼節(jié)點(diǎn)類型,分別模擬在靜力循環(huán)荷載和地震動力荷載作用下節(jié)點(diǎn)的受力性能。 首先,分別設(shè)計了四個獨(dú)立的梁柱節(jié)點(diǎn),施加低周循環(huán)荷載,得出彈性變形和塑性變形階段的應(yīng)力云圖,并通過軟件計算結(jié)果繪制出節(jié)點(diǎn)的滯回曲線、關(guān)鍵應(yīng)力路徑,對其耗能能力和剛度退化進(jìn)行對比分析。得到節(jié)點(diǎn)的受力云圖,進(jìn)而觀察塑性鉸的形成與發(fā)展趨勢,發(fā)現(xiàn)了擴(kuò)翼狗骨式節(jié)點(diǎn)在保證足夠的極限承載能力下,還可以明顯實(shí)現(xiàn)塑性鉸的外移。 然后,對四種節(jié)點(diǎn)分別建立六層、九層、十二層單榀框架的有限元模型,進(jìn)行模態(tài)分析,取前十階振型對應(yīng)的自振周期進(jìn)行對比,得出隨著層高的增加,節(jié)點(diǎn)的變化對框架剛度的影響越顯著。 最后,采用時程分析法,通過ABAQUS軟件加載埃爾森特羅、塔夫特兩種地震波,模擬框架在8度罕遇地震作用下的抗震性能,根據(jù)有限元結(jié)果用excel表格繪制出框架在地震波下的頂點(diǎn)相對位移-時間曲線和基底剪力-時間曲線。最后得出結(jié)論：對六層和九層框架,四種節(jié)點(diǎn)的曲線差值變化不大；對十二層框架,四種節(jié)點(diǎn)的曲線差值變化明顯。擴(kuò)翼狗骨式框架節(jié)點(diǎn)剛度與普通剛性框架節(jié)點(diǎn)變化不大,能保證層間位移不明顯增大并不明顯降低節(jié)點(diǎn)承載力的同時,有效地降低基底剪力。
[Abstract]:Before the rare earthquakes occurred in the North Ridge of the United States and Hanshin Japan, the Liang Zhu joints of the steel structure were always regarded by experts and scholars all over the world as having good seismic performance. After the earthquake, most of the joints had brittle failure. Scholars from all over the world have begun to do better than the general rigid joints with seismic performance of ductile joints, under the premise of "strong column weak beam" premise. In this paper, two types of weakened and enhanced nodes are proposed. Combining the dog bone node and the expanded wing node, the former proposed expanded dog bone joint is verified and compared with the former two. The advantages and disadvantages of each node are analyzed. Through the matrix displacement method of structural mechanics, each force component of the studied node is superimposed, and the normal connection is obtained according to the previous results. Reduced Beam Section connection. The expanded Flange connection is obtained. The stiffness matrix of beam element of flange Reinforced Dog-bone connection. It is concluded that the shear stiffness coefficient and the bending stiffness coefficient of the weakened joint are greatly affected by the change of the joint stiffness, and the calculation of the overall stability and the out-of-plane stability of the joint cannot be ignored. The finite element simulation is carried out with ABAQUS software. According to the types of steel joints introduced above, the behavior of joints under static cyclic load and seismic dynamic load is simulated respectively. Firstly, four independent Liang Zhu nodes are designed, and the stress cloud diagram of elastic deformation and plastic deformation stage is obtained by applying low cycle cyclic load, and the hysteretic curves of the joints are drawn by software calculation results. The critical stress path, the energy dissipation capacity and stiffness degradation are compared and analyzed. The stress cloud map of the joint is obtained, and then the forming and developing trend of plastic hinge are observed. It is found that the extended dog bone joint can also achieve the external displacement of plastic hinge obviously under the condition of sufficient ultimate bearing capacity. Then, the finite element model of six, nine and 12 layers of single frame is established, and the modal analysis is carried out. The corresponding natural vibration periods of the first ten vibration modes are compared, and the results show that the height of the frame increases with the increase of the height of the layer. The effect of the change of the joints on the stiffness of the frame is more significant. Finally, the seismic behavior of the frame is simulated by using the time history analysis method and the ABAQUS software to load the two kinds of seismic waves of Elsendro and Taft under the action of 8 degrees rare earthquake. According to the results of finite element method, the relative displacement-time curves of the top of the frame under seismic waves and the shear-time curves of the base are plotted by using the excel table. Finally, the conclusion is drawn: for the six-story frame and the nine-story frame. The curve difference of the four nodes has little change. For the 12 story frame, the curve difference of the four kinds of joints is obvious, and the stiffness of the expanded dog bone frame joint is not much different from that of the ordinary rigid frame joint. It can ensure that the interstory displacement is not obviously increased and the bearing capacity of the joints is not obviously reduced, and the base shear force can be effectively reduced at the same time.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU391;TU352.11

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