摘要
通过20个高温下带栓钉连接件型钢混凝土短柱推出试验及2个常温下的对比试验,研究其破坏形态、荷载-滑移特性、界面剪切承载力等。试验结果表明:高温下带栓钉连接件型钢混凝土推出试件的破坏形态与常温下大致相同,破坏以栓钉外侧混凝土劈裂为主;与常温下试件的荷载-滑移曲线相比,高温下推出试件荷载-滑移曲线的上升段相对平缓,在较小的荷载作用下即产生相对滑移,滑移刚度相对减小;当升温最高温度的持续时间相同时,试件的界面剪切承载力随最高温度的提高而降低,其中从常温到最高温度达到400℃以前,试件的界面剪切承载力随最高温度提高下降很快,而最高温度超过400℃以后,界面剪切承载力随最高温度提高下降的趋势减缓;当升温最高温度一定时,随着最高温度持续时间的增加,试件的界面剪切承载力降低。引入高温下界面剪切承载力影响系数,提出高温下带栓钉连接件型钢混凝土界面剪切承载力计算式,计算结果与试验结果相比总体偏于安全。
The static push-out tests of twenty steel reinforced concrete （SRC） short columns specimens with stud connectors in the surface of shape steel at elevated temperatures and two other comparative specimens at normal room temperatures were carried out to study the shear force transfer behavior on the interface between shape steel and concrete in SRC members at elevated temperatures. Test results show that the typical failure mode of steel reinforced concrete short columns with stud connectors at elevated temperatures is concrete split, which is almost the same as that at normal room temperatures. The ascending part of load-slip curves of specimens at elevated temperatures is more flat than that at normal room temperatures, and the slip rigidity of specimens at elevated temperatures is lower than that at normal room temperatures. From normal room temperature to peak temperature lower than 400 ~C, the shear transfer capacity declines fast with the increase of the highest temperature in the whole heating process and declines slow when the highest temperature exceed 400 ~C. With the same highest temperature, with the increase of time duration of the highest temperature. The calculating steel reinforced concrete with stud connectors at elevated temperatures was formula are proved to be safe with test results. the shear transmission capacity decline formula for shear transmission capacity of proposed. The calculating results of the
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2013年第8期37-45,共9页
Journal of Building Structures
基金
国家自然科学基金项目(50908118)
亚热带建筑科学国家重点实验室开放基金项目(2011KB24)
关键词
型钢混凝土
栓钉连接件
高温
推出试验
剪切承载力
steel reinforced concrete （SRC）
stud connector
elevated temperatures
push-out test
sheartransmission capacity
