【摘要】：在一超高層結(jié)構(gòu)工程中,外框架采用了焊接鋼管混凝土邊柱和夾角為12°的斜柱交叉形成高達6層且與6層樓面梁相接的巨型交叉節(jié)點,該節(jié)點構(gòu)造復(fù)雜。節(jié)點邊柱的軸向荷載不平衡在節(jié)點處產(chǎn)生剪力,同時,由于斜柱承受的軸向荷載巨大,該巨型節(jié)點受力復(fù)雜。為研究該節(jié)點的受力性能,對其進行了大比例模型加載試驗。試驗在最不利工況(1.2×重力荷載+1.3×設(shè)防地震作用)下:1)在設(shè)計荷載作用下節(jié)點試件整體仍然處于彈性工作狀態(tài);2)增大邊柱不平衡力,對節(jié)點試件的平面內(nèi)側(cè)移有一定的影響,而對平面外變形基本沒影響;3)對斜柱軸向荷載進行卸載,將節(jié)點由壓剪轉(zhuǎn)換至更不利的拉剪受力狀態(tài),節(jié)點未破壞;4)施加斜柱軸向荷載超過設(shè)計承載力的2倍,節(jié)點試件最終在斜柱兩端出現(xiàn)局部鼓起而發(fā)生破壞,說明該交叉節(jié)點的設(shè)計符合我國規(guī)范"強節(jié)點弱構(gòu)件"的設(shè)計原則。在整個加載過程中,節(jié)點區(qū)域并未產(chǎn)生剪切破壞面,鋼管內(nèi)部設(shè)置的縱向內(nèi)隔板和加勁環(huán)板使得鋼管與混凝土協(xié)同工作,節(jié)點構(gòu)造合理。通過合理的簡化,對該節(jié)點試件進行了三維非線性有限元分析,其荷載-變形曲線以及破壞模式與試驗結(jié)果吻合良好。
[Abstract]:In a super high-rise structure engineering, the welded concrete filled steel tube side column and the oblique column with an angle of 12 擄are used to cross the outer frame to form a huge cross joint which is up to 6 stories and connected with a 6 floor beam. The structure of the joint is complex. The axial load unbalance of the nodal column produces shearing force at the joint. At the same time, because of the huge axial load on the inclined column, the force of the giant joint is complicated. In order to study the mechanical behavior of the joint, a large scale model loading test was carried out. Under the most unfavorable working conditions (1.2 脳 gravity load 1.3 脳 seismic fortification), the joint specimen is still in an elastic working state under the design load. (2) increasing the unbalance force of the edge column has a certain effect on the plane medial displacement of the joint specimen. However, the out-of-plane deformation has no effect on the axial load of the oblique column, and the joint is transformed from compression shear to more unfavorable tension and shear state. The joint does not destroy the axial load of the inclined column, and the axial load of the inclined column is more than 2 times of the designed bearing capacity. Finally, the joint specimen appears local bulge at the two ends of the inclined column, which shows that the design of the cross joint conforms to the design principle of "strong joint and weak member" in our code. In the whole loading process, there is no shear failure surface in the joint area. The longitudinal inner partition plate and stiffened ring plate set inside the steel tube make the steel tube and concrete work together, and the joint structure is reasonable. Through reasonable simplification, the three-dimensional nonlinear finite element analysis of the joint specimen is carried out. The load-deformation curve and failure mode are in good agreement with the experimental results.
【作者單位】： 同濟大學(xué)土木工程防災(zāi)國家重點實驗室;同濟大學(xué)土木工程學(xué)院;華東建筑設(shè)計研究院有限公司;中國建筑第八工程局有限公司鋼結(jié)構(gòu)工程公司;
【基金】：國家科技支撐計劃項目(2011BAJ09B01)
【分類號】：TU398.9

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