【摘要】：螺栓球節(jié)點(diǎn)是大跨空間結(jié)構(gòu)中最為常用的節(jié)點(diǎn)形式之一,具有工廠化生產(chǎn)、安裝速度快等一系列優(yōu)點(diǎn)。但是,由于螺栓球節(jié)點(diǎn)組成構(gòu)件較多,且各構(gòu)件在加工過程中可能存在偏差,使得節(jié)點(diǎn)在安裝過程中容易出現(xiàn)諸多施工缺陷,如高強(qiáng)螺栓擰入長度不足和安裝偏心等。這些缺陷對節(jié)點(diǎn)及其連接桿件的力學(xué)性能帶來了不利影響。因此,對安裝缺陷下的螺栓球節(jié)點(diǎn)及其連接桿件受力性能進(jìn)行研究,可以更好的認(rèn)識和評估該類結(jié)構(gòu)的安全狀態(tài),具有重要的工程參考意義�；诖�,針對螺栓球節(jié)點(diǎn)及其連接桿件在安裝缺陷下的受力性能,開展了如下研究工作:1、螺栓擰入不足對螺栓球節(jié)點(diǎn)受彎性能影響研究基于ANSYS平臺建立了帶有螺紋的螺栓球節(jié)點(diǎn)精細(xì)化有限元模型,通過改變螺紋的嚙合個數(shù)模擬螺栓的擰入長度變化;利用已有試驗數(shù)據(jù)對模擬方法進(jìn)行了驗證。在此基礎(chǔ)上,對M20、M24、M27三種常用節(jié)點(diǎn)在不同擰入長度下的受彎性能進(jìn)行模擬研究,獲得了不同狀況下的節(jié)點(diǎn)彎矩-轉(zhuǎn)角曲線、初始轉(zhuǎn)動剛度和極限彎矩,并得到了各指標(biāo)與螺栓擰入長度之間的變化規(guī)律,給出了不同擰入長度下的節(jié)點(diǎn)受彎工作模式及破壞機(jī)理。2、螺栓擰入不足對螺栓球節(jié)點(diǎn)受拉性能影響研究詳細(xì)設(shè)計并完成了M20、M24、M27三種節(jié)點(diǎn)在螺栓擰入長度不足下的受拉性能試驗,對試驗現(xiàn)象及關(guān)鍵部位的變形情況進(jìn)行了詳細(xì)分析,獲得了不同擰入長度下的節(jié)點(diǎn)荷載-位移曲線和受拉承載力。分析總結(jié)出了螺栓球節(jié)點(diǎn)的受拉工作模式及破壞機(jī)理,給出了節(jié)點(diǎn)受拉承載力與擰入長度之間的變化規(guī)律;最后采用精細(xì)化模型對試驗進(jìn)行模擬分析,并將模擬結(jié)果與試驗進(jìn)行對比,驗證了模擬方法的準(zhǔn)確性。研究可為相似結(jié)構(gòu)的受拉性能分析和安全性能評估提供技術(shù)參考。3、安裝偏心對螺栓球節(jié)點(diǎn)及其桿件受壓穩(wěn)定性能影響研究為了考察安裝偏心對節(jié)點(diǎn)及其連接桿件受壓穩(wěn)定性能的影響,對安裝偏心下的節(jié)點(diǎn)桿件受壓性能進(jìn)行了試驗研究,精確測量了試驗構(gòu)件的初始彎曲情況,通過工程調(diào)研確定了安裝偏心的控制范圍,完成了M20、M24、M27三種節(jié)點(diǎn)在不同程度安裝偏心下的受壓穩(wěn)定性能試驗,總結(jié)出了節(jié)點(diǎn)桿件的受壓破壞模式,并給出了受壓穩(wěn)定承載力與安裝偏心之間的變化規(guī)律;最后建立了足尺度的精細(xì)化有限元模型,對節(jié)點(diǎn)構(gòu)件的受壓性能試驗進(jìn)行模擬分析,通過模擬與試驗結(jié)果的對比,驗證了模擬方法的可靠性。研究可為存在安裝偏心缺陷的空間鋼結(jié)構(gòu)承載力分析及安全性能評估提供了技術(shù)支持。
[Abstract]:Bolt ball joint is one of the most commonly used joints in long span space structure, which has a series of advantages, such as factory production, fast installation speed and so on. However, due to the large number of bolted joints and the possible deviation of each component in the process of processing, the joints are prone to many construction defects, such as insufficient length of high strength bolts and installation eccentricity and so on. These defects have a negative effect on the mechanical properties of the joints and their connecting members. Therefore, the study on the mechanical behavior of the bolted ball joints and their connecting members under the installation defects can better understand and evaluate the safety state of this kind of structures, which has important engineering reference significance. Based on this, the following research work has been carried out in view of the mechanical behavior of the bolted ball joints and their connecting members under the installation defects: 1. Research on the influence of insufficient Bolt on the bending performance of Bolt Ball joints; based on the ANSYS platform, a fine finite element model of bolt joints with thread is established, and the screw length change is simulated by changing the number of thread meshing. The simulation method is verified by the existing experimental data. On this basis, the bending behavior of three common joints M20M24M27 under different twisting lengths is simulated and studied. The moment angle curve, initial rotational stiffness and ultimate bending moment of the joints under different conditions are obtained. The variation law between each index and bolt length is obtained, and the bending mode and failure mechanism of joint under different screw length are given. 2. Study on the effect of insufficient Bolt twisting on the tensile performance of Bolt Ball joints; the tensile performance tests of M20M24M27 joints with insufficient bolt screw length are designed and completed in detail. The experimental phenomena and the deformation of the key parts are analyzed in detail, and the load-displacement curves and tensile capacity of the joints with different screw lengths are obtained. The tensile working mode and failure mechanism of the bolt ball joint are analyzed and summarized, and the variation law between the tensile bearing capacity and the screw in length of the joint is given. Finally, the precision model is used to simulate and analyze the experiment, and the simulation results are compared with the experiment to verify the accuracy of the simulation method. The research can provide technical reference for tensile performance analysis and safety performance evaluation of similar structures. Effect of installation eccentricity on compressive Stability of Bolt spherical joints and their members in order to investigate the effect of installation eccentricity on the compressive stability of joints and their connecting members, the compression performance of joints under eccentric installation is studied experimentally. The initial bending condition of test members was measured accurately, the control range of installation eccentricity was determined by engineering investigation, and the compression stability tests of M20M24M27 joints under different degrees of eccentricity were completed. The compressive failure mode of the joint member is summarized, and the variation law between the compressive stability bearing capacity and the installation eccentricity is given. At last, a finer finite element model of sufficient scale is established, and the compression performance test of the joint member is simulated and analyzed. The reliability of the simulation method is verified by comparing the simulation results with the test results. The research can provide technical support for bearing capacity analysis and safety performance evaluation of space steel structures with eccentric installation defects.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391;TU758.11

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