發(fā)布時(shí)間：2018-03-31 07:33

  本文選題：鋼結(jié)構(gòu)　切入點(diǎn)：新型節(jié)點(diǎn)　出處：《福州大學(xué)》2014年碩士論文

【摘要】：本文研究的擴(kuò)孔型鋼結(jié)構(gòu)新型節(jié)點(diǎn)與傳統(tǒng)短T型鋼連接節(jié)點(diǎn)的區(qū)別在于：將短T型鋼腹板上的常規(guī)圓孔改成了長(zhǎng)圓孔。為深入了解該新型節(jié)點(diǎn)的受力性能并提出可靠設(shè)計(jì)方法,本論文首先參考國(guó)內(nèi)外規(guī)范關(guān)于短T型鋼連接節(jié)點(diǎn)的設(shè)計(jì)規(guī)定,給出了新型節(jié)點(diǎn)的初步設(shè)計(jì)方法,并對(duì)新型節(jié)點(diǎn)進(jìn)行了初步設(shè)計(jì)；其次,采用初步設(shè)計(jì)得到的節(jié)點(diǎn)尺寸對(duì)三個(gè)采用不同擴(kuò)孔參數(shù)的新型節(jié)點(diǎn)、一個(gè)普通短T型鋼連接節(jié)點(diǎn)和一個(gè)狗骨式節(jié)點(diǎn)進(jìn)行了擬靜力試驗(yàn),研究新型節(jié)點(diǎn)在循環(huán)荷載作用下的受力性能；然后,利用ABAQUS建立了各節(jié)點(diǎn)的有限元模型,對(duì)節(jié)點(diǎn)在各受力階段的應(yīng)力分布、傳力規(guī)律和變形特點(diǎn)作了深入的受力分析；最后,針對(duì)初步設(shè)計(jì)方法中存在的問(wèn)題,提出了新型節(jié)點(diǎn)的實(shí)用設(shè)計(jì)建議,為新型節(jié)點(diǎn)的工程應(yīng)用提供設(shè)計(jì)參考。通過(guò)本論文的相關(guān)研究,得出了以下主要結(jié)論：(一)與狗骨式節(jié)點(diǎn)和普通短T型鋼連接節(jié)點(diǎn)相比,新型節(jié)點(diǎn)的最大塑性轉(zhuǎn)角、延性和耗能能力等有明顯的提高：(1)最大塑性轉(zhuǎn)角分別為普通短T型鋼連接節(jié)點(diǎn)的1.1～1.5倍,為狗骨式節(jié)點(diǎn)的1.8～2.5倍；(2)延性系數(shù)分別為普通短T型鋼連接節(jié)點(diǎn)的1.2～1.5倍,為狗骨式節(jié)點(diǎn)的2.2～2.6倍；(3)各級(jí)滯回耗能系數(shù)之和分別為普通短T型鋼連接節(jié)點(diǎn)的1.7～2.1倍,為狗骨式節(jié)點(diǎn)的6.3～8.0倍；(4)新型節(jié)點(diǎn)能夠通過(guò)摩擦滑移增加節(jié)點(diǎn)耗能,通過(guò)摩擦滑移所耗散的能量最大可達(dá)節(jié)點(diǎn)試件總體耗能的25%。(二)各節(jié)點(diǎn)的有限元分析結(jié)果與試驗(yàn)結(jié)果吻合良好,可用本文建立的有限元模型對(duì)新型節(jié)點(diǎn)作進(jìn)一步深入研究。有限元的模擬結(jié)果表明：(1)上下短T型鋼所承擔(dān)的梁端剪力相差較大,按每個(gè)短T型鋼腹板各承擔(dān)一半梁端剪力的驗(yàn)算方法偏于不安全。(2)現(xiàn)有規(guī)范無(wú)法對(duì)極限狀態(tài)下節(jié)點(diǎn)的撬力進(jìn)行計(jì)算,本文提出的撬力修正公式的計(jì)算結(jié)果與有限元模型中的撬力值接近,且有16%左右的提高。綜上所述,改進(jìn)后的新型短T型鋼連接節(jié)點(diǎn)不但能提高節(jié)點(diǎn)的延性、耗能等抗震性能指標(biāo),而且還可以通過(guò)調(diào)整擴(kuò)孔尺寸,實(shí)現(xiàn)延性、耗能等性能指標(biāo)的可控性。該新型節(jié)點(diǎn)的提出可為后續(xù)結(jié)構(gòu)的抗震性能化設(shè)計(jì)提供新的思路。
[Abstract]:In this paper, the difference between the new type joint of the reaming hole steel structure and the traditional short T-shaped steel joint is that the conventional circular hole on the short T-shaped steel web is changed into the long circular hole. In order to understand the mechanical behavior of the new type of joint and to put forward a reliable design method, In this paper, first of all, referring to the domestic and foreign specifications about the design of short T-section connections, the preliminary design method of the new joints is given, and the preliminary design of the new joints is also given. Three new joints with different reaming parameters, one ordinary T-section connection joint and one dog bone joint were tested by using the initial designed joint size. The stress behavior of the new joint under cyclic load is studied. Then, the finite element model of each joint is established by using ABAQUS, and the stress distribution, force transfer law and deformation characteristics of each joint are analyzed deeply. In view of the problems existing in the preliminary design method, the practical design suggestions of the new type joint are put forward, which can provide the design reference for the engineering application of the new type node. The main conclusions are as follows: (1) the maximum plastic turning angle of the new type of joint is compared with that of the dog bone joint and the ordinary short T-section joint. The ductility and energy dissipation capacity of the joint are obviously improved.) the maximum plastic rotation angle is 1.1 / 1.5 times of that of the ordinary T-shaped joint and 1.82.5 times of the dog's bone joint respectively.) the ductility coefficient of the joint is 1.2U / 1.5 times of that of the ordinary T-shaped joint, respectively, and the ductility coefficient is 1.5 times of that of the ordinary T-shaped joint, and the ductility coefficient is 1.82.5 times higher than that of the dog bone joint. The sum of hysteretic energy dissipation coefficients of different grades of dog bone joints is 1.7or 2.1 times of that of ordinary T-shaped connections, respectively, and 6.3o8.0 times of dog bone-type joints). The new type of joints can increase the energy consumption of the joints through friction slip. The results of finite element analysis of the total energy dissipation of the joint specimens by friction slippage are in good agreement with the experimental results, and the results of the finite element analysis of the joints are in good agreement with the experimental results. The finite element model established in this paper can be used to further study the new joints. The results of finite element simulation show that the shear force at the end of beam bearing by the upper and lower short T-section steel is quite different. According to the method of checking the shear force at the end of each short T-shaped steel web bearing half of the beam end, the existing code is not able to calculate the prying force of the joint under the limit state. The calculated results of the pry force correction formula presented in this paper are close to those in the finite element model, and they are increased by about 16%. In conclusion, the improved new type of T-shaped steel connections can not only improve the ductility of the joints, but also improve the ductility of the joints. The seismic performance indexes such as energy dissipation and so on can be controlled by adjusting the size of reaming holes to realize the controllability of ductility and energy dissipation. The proposed new joint can provide a new way of thinking for the seismic performance design of subsequent structures.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU392.1

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本文編號(hào)：1689779