【摘要】：鋼管結(jié)構(gòu)因其輕質(zhì)高強、材料延性好及良好的滯回性能等特點,是最常采用的建筑結(jié)構(gòu)形式之一。節(jié)點作為鋼管結(jié)構(gòu)的重要組成部分,同時也是結(jié)構(gòu)耗能的關(guān)鍵部位,對節(jié)點性能的研究是鋼管結(jié)構(gòu)研究發(fā)展的基礎(chǔ)。相對節(jié)點靜力性能方面的研究,對鋼管節(jié)點滯回性能的研究相對較少,尤其對鋼管結(jié)構(gòu)主管灌混凝土的加強節(jié)點滯回性能的研究處于起步階段�；诖�,本文對鋼管結(jié)構(gòu)主管灌混凝土的加強型K節(jié)點抗震破壞機理進(jìn)行試驗研究,共對6個鋼管結(jié)構(gòu)K型搭接節(jié)點試件開展擬靜力試驗,并通過有限元軟件分析與擬靜力試驗數(shù)據(jù)進(jìn)行比較分析。主要的研究工作如下:(1)加強型K型搭接節(jié)點的模型建立。通過試驗前期的預(yù)分析,將焊縫模擬引入K節(jié)點的模型建立,對關(guān)鍵參數(shù)進(jìn)行確定,分析節(jié)點的靜力性能,確定試驗節(jié)點試件的幾何參數(shù),為試件的試驗加載做好準(zhǔn)備工作。(2)加強型K節(jié)點的擬靜力試驗研究。設(shè)計了 6個鋼管結(jié)構(gòu)加強型K型搭接節(jié)點試件,在兩支管端通過伺服作動器實現(xiàn)低周往復(fù)軸向荷載,考察節(jié)點的破壞機理。試驗表明,未加強試件其主要破壞模式為主管管壁的塑性破壞,而通過主管灌混凝土加強的試件,其主要破壞模式為主管管壁的拉裂破壞并且伴隨有受壓支管的輕微屈曲。通過比較兩者破壞模式,得出主管灌混凝土的加強方式,可以改變節(jié)點的破壞模式,抑制主管的塑性失效破壞,有效的提高節(jié)點承載力和承載效率。(3)主管灌混凝土的鋼管結(jié)構(gòu)K型搭接節(jié)點滯回性能量化評價。基于試驗結(jié)果,通過對加強型K型搭接節(jié)點的滯回分析,表明未加強K型搭接節(jié)點和通過主管灌混凝土加強的K型搭接節(jié)點均具有較好的滯回性能,可以滿足結(jié)構(gòu)的抗震要求;主管內(nèi)灌混凝土的加強方式在一定程度上限制了節(jié)點的塑性發(fā)展,降低了節(jié)點的延性和滯回性能,但提高了節(jié)點的剛度,可以有效增大試件的極限承載力。另外通過比較兩種不同的加強方式,在滯回性能方面兩者差別不大,表明采用粉煤灰混凝土可以很好的替代傳統(tǒng)混凝土用于鋼管結(jié)構(gòu)局部加強。(4)加強型K型搭接節(jié)點有限元滯回性能分析。用有限元分析軟件ANSYS對節(jié)點進(jìn)行滯回性能模擬分析,通過有限元模擬結(jié)果與擬靜力試驗比較,得出節(jié)點破壞模式與試驗結(jié)果相符,滯回曲線也與試驗結(jié)果吻合,但是承載力偏大。說明可以采用有限元軟件對節(jié)點試件進(jìn)行參數(shù)分析。
[Abstract]:Steel pipe structure is one of the most commonly used building structures because of its light weight and high strength, good ductility and good hysteretic performance. As an important part of the steel pipe structure, the joint is also the key part of the energy dissipation. The research on the joint performance is the foundation of the research and development of the steel pipe structure. Relative to the static performance of the joints, the hysteretic behavior of steel pipe joints is relatively few, especially for the study of the hysteretic behavior of reinforced joints filled with concrete in the main pipe structure is still in its infancy. Based on this, the anti-seismic failure mechanism of reinforced K-joints of steel tube structure is studied in this paper, and the pseudo-static tests are carried out on six K-type lap joints of steel tube structures. And through the finite element software analysis and the pseudo-static test data to carry on the comparison analysis. The main research work is as follows: (1) the model of strengthened K-type lap joints is established. Through the pre-analysis of the pre-test, the welding seam simulation is introduced into the K-node model, the key parameters are determined, the static performance of the joints is analyzed, and the geometric parameters of the test joints are determined. Prepare for the test loading of the specimen. (2) quasi-static test study of the strengthened K-joints. Six specimens of reinforced K-type lap joints of steel pipe structures were designed to realize low circumferential reciprocating axial loads on two pipe ends by servo actuators. The failure mechanism of the joints was investigated. The results show that the main failure mode of the unreinforced specimen is the plastic failure of the main pipe wall, while the main failure mode of the specimen strengthened by the main pouring concrete is the tensile crack failure of the main pipe wall, accompanied by slight buckling of the compressed branch pipe. By comparing the two failure modes, it is concluded that the strengthening mode of the main pouring concrete can change the failure mode of the joint and restrain the plastic failure of the supervisor. The bearing capacity and bearing efficiency of joints are improved effectively. (3) quantitative evaluation of hysteretic behavior of K-type lap joints of steel tube structures filled with concrete is carried out. Based on the experimental results, the hysteretic analysis of the strengthened K-lap joint shows that both the K-type lap joint and the K-type lap joint strengthened by the main pouring concrete have better hysteretic performance and can meet the seismic requirements of the structure. To a certain extent, the strengthening mode of the inner-filled concrete in the pipe limits the plastic development of the joint, reduces the ductility and hysteretic performance of the joint, but increases the stiffness of the joint and can effectively increase the ultimate bearing capacity of the specimen. In addition, by comparing two different reinforcement methods, there is no significant difference in hysteretic performance between the two methods. It is shown that fly ash concrete can be used to replace traditional concrete for local strengthening of steel tube structures. (4) finite element hysteretic performance analysis of reinforced K-type lap joints. Finite element analysis software ANSYS is used to simulate the hysteretic performance of the joints. Comparing the finite element simulation results with the pseudo-static tests, the results show that the failure mode of the joints is consistent with the experimental results, and the hysteretic curves are also consistent with the experimental results. But the bearing capacity is too large. It shows that the finite element software can be used to analyze the parameters of the joints.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU392.3

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