本文關(guān)鍵詞： T型鑄鋼節(jié)點(diǎn) 極限承載力 滯回性能 沖擊荷載 有限元　出處：《華南理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：由于良好的動(dòng)力性能，鑄鋼節(jié)點(diǎn)已經(jīng)在國內(nèi)外得到廣泛應(yīng)用。目前，鑄鋼節(jié)點(diǎn)主要應(yīng)用于結(jié)構(gòu)中的典型節(jié)點(diǎn)(即桿件與桿件相連的節(jié)點(diǎn))、錨具夾具和支座節(jié)點(diǎn)等結(jié)構(gòu)構(gòu)件中。已有的研究主要是針對(duì)具體工程中應(yīng)用到的鑄鋼節(jié)點(diǎn)，利用軟件進(jìn)行彈性或塑性的應(yīng)力、應(yīng)變分析以及破壞機(jī)理的研究或針對(duì)具體工程的節(jié)點(diǎn)進(jìn)行足尺試驗(yàn)，但是其相對(duì)深入的理論研究和受力分析還處于起步階段。本文運(yùn)用大型通用非線性有限元分析軟件ABAQUS對(duì)T型鑄鋼節(jié)點(diǎn)靜動(dòng)力學(xué)性能進(jìn)行數(shù)值分析。論文主要開展了以下三個(gè)方面的研究工作： （1）分別計(jì)算了不同幾何參數(shù)下T型鑄鋼節(jié)點(diǎn)在支管受軸向荷載情況下的靜力極限承載力，并且考慮倒角系數(shù)對(duì)于極限承載力的影響，通過非線性回歸分析，得出了鑄鋼節(jié)點(diǎn)軸向承載力簡化計(jì)算公式，并與國內(nèi)外規(guī)范計(jì)算結(jié)果進(jìn)行對(duì)比。 （2）在其他參數(shù)保持不變的情況下分別變化節(jié)點(diǎn)管徑比、徑厚比、主管長徑比和倒角系數(shù)等參數(shù)，得到該參數(shù)對(duì)節(jié)點(diǎn)滯回曲線、滯回耗能性能和延性比等節(jié)點(diǎn)性能指標(biāo)的影響并對(duì)各個(gè)參數(shù)對(duì)節(jié)點(diǎn)的影響進(jìn)行對(duì)比分析，總體評(píng)價(jià)了T型鑄鋼節(jié)點(diǎn)的抗震性能。 （3）建立了T型鑄鋼節(jié)點(diǎn)動(dòng)態(tài)抗沖擊分析模型，采用有限元分析方法分析T型鑄鋼節(jié)點(diǎn)在不同沖擊動(dòng)能下的響應(yīng)，得出節(jié)點(diǎn)受沖擊后的變形、節(jié)點(diǎn)的位移時(shí)程曲線、沖擊力時(shí)程曲線，揭示了鑄鋼節(jié)點(diǎn)沖擊變形的變化規(guī)律及沖擊過程中節(jié)點(diǎn)能量的變化，并研究了隨節(jié)點(diǎn)管徑比、徑厚比、主管長徑比等幾何參數(shù)變化節(jié)點(diǎn)響應(yīng)的規(guī)律。
[Abstract]:Due to its good dynamic performance, cast steel joints have been widely used at home and abroad. The cast steel joints are mainly used in typical structural members such as the joints connected with the bars, the anchoring fixtures and the support joints, etc. The existing research is mainly aimed at the cast steel joints used in specific projects. Elastic or plastic stress, strain analysis, failure mechanism research or full-scale test for the joints of a specific project by means of software, However, its relatively deep theoretical research and stress analysis are still in its infancy. In this paper, the static and dynamic properties of T-shaped cast steel joints are numerically analyzed by using the large-scale general nonlinear finite element analysis software ABAQUS. The main work of this paper is to carry out the static and dynamic analysis of T-cast steel joints. The following three aspects of research work were carried out:. 1) the static ultimate bearing capacity of T-shaped cast steel joints under axial load is calculated under different geometric parameters. Considering the influence of chamfer coefficient on ultimate bearing capacity, nonlinear regression analysis is carried out. A simplified formula for calculating the axial bearing capacity of cast steel joints is obtained and compared with the calculated results of codes at home and abroad. Under the condition that other parameters remain unchanged, the parameters such as diameter ratio, ratio of diameter to thickness, ratio of length to diameter and chamfer coefficient are changed respectively, and the hysteretic curve of the joint is obtained. The effects of hysteretic energy dissipation performance and ductility ratio on the performance of the joints are compared and analyzed. The seismic behavior of T-shaped cast steel joints is evaluated as a whole. The dynamic impact analysis model of T cast steel joint is established. The response of T cast steel joint under different impact kinetic energy is analyzed by finite element method, and the deformation and displacement time history curve of the joint after impact are obtained. The time history curve of impact force reveals the change law of impact deformation of cast steel joints and the change of joint energy during impact. The response of joints with geometric parameters such as pipe diameter ratio, diameter to thickness ratio and ratio of length to diameter is studied.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU391

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