本文選題：鋼框架 + 弱軸連接��； 參考：《長(zhǎng)安大學(xué)》2017年碩士論文

【摘要】：節(jié)點(diǎn)域箱形加強(qiáng)式工字形柱弱軸連接是按照高延性和高承載力的抗震設(shè)計(jì)思想,針對(duì)工字形柱鋼框架弱軸連接設(shè)計(jì)提出的一種新型連接構(gòu)造形式,依據(jù)前期邊框架節(jié)點(diǎn)的試驗(yàn)研究和有限元分析證實(shí)了這種連接具有良好的抗震性能。采用新型梁柱弱軸連接的工字形柱鋼框架比箱形柱鋼框架相比更具有良好的經(jīng)濟(jì)性。本文對(duì)節(jié)點(diǎn)域箱形加強(qiáng)式工字形柱弱軸蓋板加強(qiáng)連接節(jié)點(diǎn)進(jìn)行循環(huán)加載試驗(yàn)研究,分析了節(jié)點(diǎn)試件的破壞模式、滯回性能、延性及耗能能力等抗震性能。采用ABAQUS建立考慮損傷的有限元模型并進(jìn)行非線性分析,分析了節(jié)點(diǎn)的關(guān)鍵影響參數(shù)并確定參數(shù)的合理取值。依據(jù)試驗(yàn)研究與有限元分析提出了針對(duì)此類(lèi)型節(jié)點(diǎn)的設(shè)計(jì)方法,并結(jié)合實(shí)際工程驗(yàn)證節(jié)點(diǎn)設(shè)計(jì)方法的合理性與可靠性。試驗(yàn)與有限元研究結(jié)果如下:(1)新型梁柱弱軸蓋板加強(qiáng)連接節(jié)點(diǎn)能夠?qū)崿F(xiàn)塑性鉸的外移,避免了梁翼緣連接焊縫過(guò)早發(fā)生脆性斷裂破壞。節(jié)點(diǎn)的滯回曲線呈現(xiàn)較為飽滿的梭形,具有良好的耗能能力,但焊縫的開(kāi)裂導(dǎo)致節(jié)點(diǎn)的位移延性系數(shù)低于3.0。(2)節(jié)點(diǎn)域在節(jié)點(diǎn)受力過(guò)程中發(fā)生彈性剪切變形,節(jié)點(diǎn)域處應(yīng)力基本處于彈性階段,新型梁柱弱軸連接節(jié)點(diǎn)具有明顯的“強(qiáng)節(jié)點(diǎn)域”特征。(3)蒙皮板厚度對(duì)節(jié)點(diǎn)的抗震性能具有明顯的影響作用。在節(jié)點(diǎn)設(shè)計(jì)時(shí),應(yīng)保證節(jié)點(diǎn)蒙皮板厚度的取值滿足蒙皮板最小厚度的設(shè)計(jì)要求。(4)加強(qiáng)蓋板的形狀對(duì)節(jié)點(diǎn)的抗震性能影響較小,設(shè)計(jì)時(shí)可優(yōu)先選取矩形加強(qiáng)蓋板,而加強(qiáng)蓋板的長(zhǎng)度和厚度對(duì)節(jié)點(diǎn)的抗震性能具有明顯的影響作用。建議加強(qiáng)蓋板的取值范圍為:加強(qiáng)蓋板的長(zhǎng)度取梁高的0.5~0.7倍,加強(qiáng)蓋板的厚度應(yīng)大于等于梁翼緣厚度的0.5倍且大于等于6mm。(5)梁柱線剛度比的變化對(duì)節(jié)點(diǎn)的抗震性能具有明顯的影響作用,但梁線剛度和柱線剛度的變化對(duì)節(jié)點(diǎn)抗震性能的影響規(guī)律和程度相差較大。建議節(jié)點(diǎn)的梁柱線剛度比應(yīng)小于等于1.5。(6)提出了新型梁柱弱軸蓋板加強(qiáng)連接節(jié)點(diǎn)的設(shè)計(jì)方法,節(jié)點(diǎn)設(shè)計(jì)方法經(jīng)驗(yàn)證是合理可靠的,可為此類(lèi)型節(jié)點(diǎn)的工程應(yīng)用提供設(shè)計(jì)參考。
[Abstract]:The box reinforced I-shaped column weak axis connection in the joint domain is a new type of connection structure, which is based on the seismic design idea of high ductility and high bearing capacity, aiming at the weak axis connection design of I-shaped column steel frame. According to the experimental research and finite element analysis, the joint has good seismic performance. The I-shaped column steel frame with a new type of Liang Zhu weak axis connection is more economical than the box column steel frame. In this paper, cyclic loading tests are carried out on the connection joints with box reinforced I-shaped columns in the joint domain. The failure mode, hysteretic performance, ductility and energy dissipation capacity of the joints are analyzed. The finite element model considering damage is established by Abaqus and the nonlinear analysis is carried out. The key parameters of the node are analyzed and the reasonable values of the parameters are determined. Based on the experimental research and finite element analysis, the design method for this type of joint is proposed, and the rationality and reliability of the design method are verified by the actual engineering. The experimental and finite element results are as follows: (1) A new type of Liang Zhu weak axle cover plate can realize the plastic hinge's outward displacement and avoid the premature brittle fracture failure of the beam-flange joint weld. The hysteretic curve of the joint presents a full fusiform shape with good energy dissipation ability, but the crack of the weld seam leads to the displacement ductility coefficient of the joint being lower than 3.0.2.) the elastic shear deformation occurs in the joint domain during the process of the joint loading. The stress in the joint region is basically in the elastic stage, and the thickness of the sheathed plate has obvious influence on the seismic behavior of the joint. The new type of Liang Zhu weakly connected joint has the characteristic of "strong joint domain". In the design of joints, it is necessary to ensure that the value of the thickness of the joint skin plate meets the design requirements of the minimum thickness of the skin plate) the shape of the strengthened cover plate has little effect on the seismic performance of the joint, and the rectangular reinforced cover plate can be selected first in the design. The length and thickness of the strengthened slab have a significant effect on the seismic performance of the joints. It is suggested that the value range of the strengthened cover plate is: the length of the strengthened cover plate is 0.5 ~ 0. 7 times the height of the beam, The thickness of the strengthened slab should be greater than 0.5 times of the thickness of the flange of the beam and greater than or equal to 6mm. 5) the change of the stiffness ratio of the Liang Zhu line has an obvious effect on the seismic behavior of the joints. However, the influence of beam line stiffness and column stiffness on the seismic behavior of joints varies greatly. It is suggested that the Liang Zhu line stiffness ratio of the joint should be less than or equal to 1.5.56) A new design method of the Liang Zhu weak shaft cover plate reinforced joint is proposed. The design method of the joint is proved to be reasonable and reliable, which can be used as a design reference for the engineering application of the type of joint.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU391;TU312.3

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