本文關(guān)鍵詞：壓彎剪扭復(fù)合受力型鋼混凝土L形柱破損機理及強度計算　出處：《廣西大學(xué)》2017年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 型鋼混凝土柱 L形柱 壓彎剪扭 擬靜力試驗 抗震性能數(shù)值模擬 破損機理 強度計算

【摘要】：2006年發(fā)布實施的《混凝土異形柱結(jié)構(gòu)技術(shù)規(guī)程》(JGJ149-2006),使混凝土異形柱結(jié)構(gòu)的推廣應(yīng)用有了國家行業(yè)標準的支持,拓展了混凝土異形柱結(jié)構(gòu)的應(yīng)用范圍。但是由于異形柱具有承載能力較低、抗震性能不理想、鋼筋較密集等缺陷,有關(guān)學(xué)者提出在異形柱截面中主要配置型鋼,形成型鋼混凝土異形柱。型鋼混凝土異形柱具有承載能力較高、剛度較大、延性和變形性能好等優(yōu)點,一定程度上可以克服普通鋼筋混凝土異形柱的缺陷,擴大異形柱結(jié)構(gòu)的適用范圍。國內(nèi)外學(xué)者在型鋼混凝土異形柱正截面承載力、斜截面承載力、抗震性能等方面開展了一定的研究,并得到了一些重要研究成果,結(jié)果指出配置型鋼后的鋼筋混凝土L形柱在各項性能指標上有了顯著提升。然而,目前關(guān)于該新型結(jié)構(gòu)在壓彎剪扭復(fù)合受力下的力學(xué)性能等還未見太多報道。本文在前人研究的基礎(chǔ)上,從模型試驗、有限元模擬、強度計算等幾個方面對壓彎剪扭復(fù)合受力型鋼混凝土 L形柱的力學(xué)性能進行了系統(tǒng)研究。設(shè)計了一套復(fù)合受力加載裝置,完成了 18個承受恒定軸壓力復(fù)合彎剪扭作用的型鋼混凝土 L形柱擬靜力試驗,試驗主要考慮了扭彎比、配鋼形式和肢高肢厚比三個變化參數(shù),揭示了壓彎剪扭復(fù)合受力型鋼混凝土L形柱的破壞過程和破壞形態(tài),分析了滯回特性、骨架曲線、承載能力、剛度、延性、耗能等力學(xué)性能指標以及各變化參數(shù)的影響。結(jié)果表明:小扭彎比試件主要發(fā)生彎曲破壞,大扭彎比試件發(fā)生扭轉(zhuǎn)破壞,其中彎曲破壞又細分為彎曲破壞、彎剪破壞和彎扭破壞。采用ABAQUS軟件對壓彎剪扭復(fù)合受力型鋼混凝土 L形柱試件在低周反復(fù)荷載下的抗震性能進行了仿真分析,并與試驗結(jié)果進行了對比。試驗與仿真相互印證的結(jié)果均表明:從抗彎角度看,實腹配鋼試件的抗彎承載能力要好于空腹配鋼以及空腹槽鋼配鋼試件的抗彎承載能力,從抗扭角度看,空腹槽鋼配鋼試件的承載能力要好于空腹配鋼以及實腹配鋼試件的承載能力。運用平衡(塑性)桁架模型并參考相關(guān)規(guī)范規(guī)程,對試件單一受力狀態(tài)下的極限承載力進行了分析,探討了軸壓比和扭彎比對壓彎剪扭復(fù)合受力型鋼混凝土L形柱極限承載力的影響。結(jié)果表明:軸壓比及扭彎比對試件的抗彎極限承載力均有較大的影響。在軸壓比0.15的軸壓力的作用下,試件的試驗彎矩極限承載力比純彎彎矩極限承載力都有較明顯的下降,實腹配鋼、空腹配鋼及空腹槽鋼配鋼的平均降幅依次在27.4%、28.1%、28.6%左右;在小扭彎比(0～0.3)條件下,施加扭矩的作用對實腹配鋼型鋼混凝土試件抗彎承載力的影響最大,隨著扭彎比的增大,試件彎矩承載力逐漸降低,實腹配鋼、空腹配鋼及空腹槽鋼配鋼的平均降幅依次在26%、30%、30%左右;在大扭彎比(0.89)條件下,試件彎矩承載力降低幅度很大,降幅近63.6%。
[Abstract]:In 2006, the Technical Specification for concrete special-shaped column structure was issued and implemented, which made the popularization and application of concrete special-shaped column structure supported by the national industry standard. The application scope of concrete special-shaped column structure is expanded, but due to the defects such as low bearing capacity, poor seismic performance, dense reinforcement and so on, some scholars put forward the main configuration of shaped steel in the section of special-shaped column. The special-shaped columns of SRC have the advantages of high bearing capacity, high stiffness, good ductility and good deformation performance, which can overcome the defects of ordinary RC special-shaped columns to a certain extent. Domestic and foreign scholars have carried out some research on normal section bearing capacity, oblique section bearing capacity, seismic performance and so on of SRC special-shaped columns, and obtained some important research results. The results show that the reinforced concrete L-shaped columns with profile steel have a significant improvement in various performance indexes. At present, there are not many reports on the mechanical properties of the new structure under the combined force of compression, bending, shear and torsion. Based on the previous research, this paper is based on the model test and finite element simulation. The mechanical properties of steel reinforced concrete L-shaped columns under compression, bending, shear and torsion forces are systematically studied in some aspects, such as strength calculation, and a set of composite loading device is designed. The pseudostatic tests of 18 steel reinforced concrete L-shaped columns subjected to constant axial pressure combined with bending shear and torsion have been completed. The three parameters including torsional bending ratio, steel configuration and limb height / thickness ratio have been considered in the experiment. The failure process and failure pattern of L-shaped columns of steel reinforced concrete subjected to compression, bending, shear and torsion are revealed. The hysteretic characteristics, skeleton curves, bearing capacity, stiffness and ductility are analyzed. The results show that the flexural failure occurs mainly in small torsional bending specimens, and torsional failure occurs in large torsional bending specimens, in which the bending failure is subdivided into bending failure. ABAQUS software was used to simulate the seismic behavior of steel reinforced concrete L-shaped columns subjected to compression, bending, shear and torsion under low cyclic cyclic loading. The results are compared with the experimental results. The experimental results and simulation results show that: from the point of view of bending resistance. The flexural bearing capacity of the solid web steel specimen is better than that of the hollow steel matching and the hollow channel steel fitting specimen, from the angle of torsion resistance. The load-carrying capacity of hollow channel steel fitting specimen is better than that of empty stomach steel matching and solid web steel fitting. The balanced (plastic) truss model is used and the relevant specifications are referred to. The ultimate bearing capacity of the specimen under single load is analyzed. The influence of axial compression ratio and torsional bending ratio on ultimate bearing capacity of steel reinforced concrete L-shaped columns under compression, bending, shear and torsional forces is discussed. The axial compression ratio and torsional bending ratio have great influence on the ultimate bearing capacity of the specimens under the axial pressure of 0.15. The ultimate bearing capacity of test specimens is obviously lower than that of pure bending moment, and the average decrease of steel distribution of solid web, fasting steel and channel steel is 27.4% and 28.1% respectively. About 28.6%; Under the condition of small ratio of torsion and bending, the effect of torque on the flexural capacity of steel reinforced concrete specimens with solid web is the greatest. With the increase of the ratio of torsion and bending, the bending capacity of steel reinforced concrete specimens decreases gradually. The average decrease of solid steel, empty stomach steel and empty channel steel was about 30% or so in turn. Under the condition of large torsional bending ratio of 0.89), the bending moment bearing capacity of the specimen decreases by a large extent, which is about 63.695%.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TU398.9
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本文編號：1420976