火灾后等肢L形型钢混凝土柱偏心受压力学性能试验研究  

Mechanical Properties of Equiaxial L-shaped Steel Reinforced Concrete Columns after Fire

作　　者：李晓东[1] 丰见政 刘蒙[1] 高立堂[1] 陈锦波[1] 闫照建 LI Xiaodong;FENG Jianzheng;LIU Meng;GAO Litang;CHEN Jinbo;YAN Zhaojian(School of Civil Engineering,Qingdao Technological University,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《结构工程师》2018年第4期150-159,共10页Structural Engineers

基　　金：国家自然科学基金项目(51178232/E080804);亚热带建筑科学国家重点实验室自主研究课题(2012KB89)

摘　　要：为研究火灾后等肢L形型钢混凝土柱的力学性能,对4根受火后试件和1根未受火对比试件进行静力加载试验,火灾试验采用ISO834标准升温过程曲线。考虑加载偏心距对试件力学性能的影响。通过试验,得到试件破坏形态以及极限承载力、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。研究表明:(1)两面受火1小时的等肢L形型钢混凝土柱仍然具有较高的竖向承载能力;(2)通过空腹式配钢形式与合理的腹杆布置能够保证型钢与混凝土的协同工作能力,平均应变平截面假定仍适用于火灾后等肢L形型钢混凝土柱的分析中;(3)火灾后异形柱截面抗弯能力随着轴力的增加先增大后减小。To study the influence of loading eccentricity on the mechanical properties of equiaxial L-shaped steel reinforced concrete column after fire,the static loading test was carried out on 4 specimens after exposed to ISO 834 fire and 1 specimens tested at a ambient temperature.The failure mode,the ultimate load bearing capacity,the average strain distribution of the section,the lateral displacement curve,the load slip curve and the section characteristics were obtained in experiments for analysis.The results show that:(1)Equiaxial L-shaped steel reinforced concrete column with two sides exposed to fire for one hour still has sufficient load bearing capacity.(2)Appropriately designing the hollow steel form and arranging the layout of web members ensure the collaborative work of steel and concrete.The assumption that plane sections remain plane is still applicable to equiaxial L-shaped steel reinforced concrete column after fire.(3)The flexural strength of L-shaped steel reinforced concrete column increases firstly and then decreases with the increase of applied axial load.

关 键 词：火灾后 等肢L形型钢混凝土柱 力学性能 截面特性 偏心受压 

分 类 号：TU398.9[建筑科学—结构工程]