火灾后十字形型钢混凝土柱单向偏心受压力学性能试验研究

发布时间：2018-05-15 12:25

本文选题：十字形型钢混凝土柱 + 火灾　；参考：《实验力学》2016年06期

【摘要】：对4根十字形型钢混凝土柱进行了火灾后的力学性能试验研究,并按照ISO834标准升温过程曲线进行火灾试验。1根未受火试件作为对比。异形柱采用桁架式配钢形式,横向腹杆间距为260mm。试件通过静力荷载作用下的单向偏心受压试验,研究加载偏心距对力学性能的影响。通过试验,得出了试件的破坏形式以及极限承载力、截面平均应变分布、柱中侧向位移曲线、荷载-滑移曲线和截面特性。试验结果表明:(1)受火1小时后的十字形型钢混凝土柱仍然具有较高的竖向承载力;(2)试验测量的混凝土与槽钢之间滑移较小,说明型钢与混凝土之间能够协同工作,平截面假定在十字形型钢混凝土柱的截面中仍然适用;(3)在90°荷载角的作用下,十字形型钢混凝土柱会发生单向弯曲;(4)随着荷载的增加,挠度曲线存在水平段,说明火灾后型钢混凝土柱仍具有较大的后期变形能力,并且随着偏心距的增大,试件的变形能力更强。
[Abstract]:The mechanical properties of four cross shaped steel reinforced concrete columns after fire were studied and compared with 1. 1 unburned specimens according to the ISO834 standard heating process curve. The special-shaped column is composed of truss steel with a transverse web spacing of 260 mm. The influence of eccentricity on mechanical properties was studied by unidirectional eccentric compression test under static load. The failure form, ultimate bearing capacity, average strain distribution, lateral displacement curve, load-slip curve and cross-section characteristics of the specimen are obtained. The test results show that the cross section steel reinforced concrete column after 1 hour of fire still has higher vertical bearing capacity. The slip between concrete and channel steel measured by the test is smaller, which indicates that the cross section concrete column can work together with concrete. The plane section assumes that the cross section is still applicable to the cross section of steel reinforced concrete columns.) under the action of 90 掳load angle, the cross section steel reinforced concrete columns will be subjected to unidirectional bending. (4) with the increase of load, the deflection curve has horizontal section. The results show that the steel reinforced concrete columns still have larger deformation capacity after fire, and the deformation capacity of the specimens is stronger with the increase of eccentricity.
【作者单位】：青岛理工大学土木工程学院;
【基金】：国家自然科学基金项目(51178232/E080804)
【分类号】：TU398.9

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