摘要
为了研究火灾后型钢混凝土异形柱的正截面承载力,在9根十字形、8根T形、9根等肢L形(简称DL形)和9根不等肢L形(简称BL形)型钢混凝土柱试验研究的基础上,编制了MATLAB非线性程序,通过对比表明运算结果与试验结果基本吻合。利用程序分析了弯矩作用方向角、含钢率、混凝土强度等级和偏心距对火灾后型钢混凝土异形柱正截面承载力的影响。试验结果表明:火灾后型钢混凝土异形柱破坏形式分为受拉破坏、受压破坏、轴心受压破坏和界限破坏;截面应变分布也基本符合平截面假定;在偏心距一定的情况下,0°加载角的承载力高于45°加载角的承载力。在其它因素一定的条件下,构件的极限承载力随含钢率的增大而增大,与混凝土强度等级呈正比,随偏心距的增大而减小。
Thirty five specimens are designed for static loading to research the section bearing capacity, including nine cruciform- shaped,eight T-shaped,nine L shaped with equal legs （DL shaped） and nine L shaped with unequal legs （BL shaped） steel reinforced concrete special shaped columns. A set of MATLAB nonlinear programs are compiled. Overall, the calculation results are consistent with experimental results. And the influences of loading angle, sectional steel ratio, concrete strength grade and eccentricity are analyzed. Test results show that the failure modes of steel reinforced concrete special shaped columns are tension failure mode, compression failure mode, balanced failure mode and axial compression failure mode. The sectional strain basically fits the plane-section assumption. When the columns are loaded with same eccentricity,the specimens with 45° are more damaged than those with 0°. The increase in the sectional steel ratio and concrete strength grade can improve the normal section bearing capacity effectively. With the increase of eccentricity, the flexural capacity decreases.
作者
高立堂
蔡维沛
李晓东
GAO Litang;CAI Weipei;LI Xiaodong(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Chin)
出处
《建筑钢结构进展》
CSCD
北大核心
2018年第3期58-71,共14页
Progress in Steel Building Structures
基金
国家自然科学基金(51178232)
关键词
火灾后
型钢混凝土异形柱
正截面承载力
非线性分析
after fire
steel reinforced concrete special-shaped column
section bearing capacity
nonlinear analysis
