- 摘 要
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(1 華南理工大學(xué)土木工程系，廣州 510640； 2 廣州城建開發(fā)設(shè)計院有限公司，廣州 510620)
［摘要］在試驗研究的基礎(chǔ)上，應(yīng)用有限元程序ABAQUS，對節(jié)點區(qū)柱鋼管不連通式鋼管混凝土柱-平板節(jié)點在軸壓、偏壓作用下的荷載-位移曲線、裂縫開展、混凝土及鋼筋應(yīng)力、受壓破壞面等展開分析，揭示了節(jié)點區(qū)的應(yīng)力分布規(guī)律。結(jié)果表明，受壓極限狀態(tài)時，節(jié)點區(qū)的破壞面為連接上柱柱腳和下柱柱腳之間的區(qū)域；而節(jié)點區(qū)配置環(huán)向鋼筋及下柱鋼管插入節(jié)點區(qū)內(nèi)的構(gòu)造方式有利于改善節(jié)點區(qū)混凝土的應(yīng)力狀態(tài)，從而提高節(jié)點的受壓承載力。結(jié)合試驗研究提出了該節(jié)點的設(shè)計方法。
［關(guān)鍵詞］鋼管混凝土；節(jié)點；受力性能；有限元法；非線性
Nonlinear finite element analysis on mechanical behavior of a new-type of CFST column-slab joint
Liu Fujun1,2, Cai Jian1
(1 Department of Civil Engineering, South China University of Technology, Guangzhou 510640, China;
2 Guangzhou City Construction and Development Design Institute Co., Ltd., Guangzhou 510620, China)
Abstract:The load-displacement curve, crack development, stress of concrete and steel bar and the failure surface of the discontinuous-tube-in-core concrete filled steel tubular (CFST) column-slab joints under axial and eccentrical compression were analyzed by ABAQUS based on experimental research. The stress distribution of the joint zone was revealed. The results show that the failure surface locates in the zone between the ends of the upper and lower column. Collocating hooped rebars in the joint zone and the construction of inserting the steel tube of the lower column into the joint can improve the concrete stress state, so that the bearing capacity under compression can be improved. The formulas of the axial and eccentricity bearing capacity were presented.
Keywords:concrete filled steel tubular; joint; mechanical behavior; finite element method; nonlinear
廣州市建設(shè)科技發(fā)展基金(200106)資助項目，廣州市城市建設(shè)開發(fā)集團(tuán)有限公司科研基金資助項目，廣州城建開發(fā)設(shè)計院有限公司科研基金資助項目。
