焊接H形钢部分包裹高强混凝土柱抗震性能试验研究  

Experimental study on seismic performance of welded H-section steel partially encased columns with high strength concrete

作　　者：赵根田 张宇鸣 曹芙波 周易晖 ZHAO Gentian;ZHANG Yuming;CAO Fubo;ZHOU Yihui(School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《建筑结构学报》2019年第4期116-122,共7页Journal of Building Structures

基　　金：国家自然科学基金项目(51268042)

摘　　要：以混凝土工作系数为参数,研究部分包裹高强混凝土柱(PEC柱)的抗震性能,对6根焊接H形钢部分包裹高强混凝土柱进行低周反复荷载试验。结果表明:不同设计参数下PEC柱的柱顶荷载-位移滞回曲线均为饱满的梭形,在柱翼缘厚度不变的情况下,混凝土工作系数从0.36提升至0.39时,PEC柱的极限荷载提升了7.5%,最大水平位移变化不大;混凝土工作系数从0.39提升至0.44时,PEC柱的极限荷载提升了2.1%,极限位移减小了16.98%,这是由于高强混凝土的脆性导致的。混凝土强度不变,混凝土工作系数从0.40减至0.36,PEC柱位移延性系数增加36.97%,改变翼缘厚度,降低混凝土工作系数对PEC柱的延性提升较为明显。位移角为1/35时,PEC柱承载力退化系数在0.95～0.99之间,位移延性系数在3.61～4.25之间,仍能保持良好的承载性能,且耗能系数均在2.0以上。此种PEC柱有良好的耗能能力和抗震性能,适用于抗震设防区的建筑结构中。In order to study the seismic performance of partially encased high strength concrete columns(PEC columns),six such column specimens,each with a welded steel H-section,were tested under low frequency reversed cyclic quasi static loading.The test variable is the percentage of load-carrying capacity contributed by concrete(referred to as the working coefficient of concrete).The results show that the hysteresis curve of the specimens with different design parameters all have a full shuttle type.For the same flange thickness,when the working coefficient of concrete increases from 0.36 to 0.39,the bearing capacity increases by 7.5%with the maximum horizontal displacement change a little.Due to the brittleness of high strength concrete,when the working coefficient increases from 0.39 to 0.44,the bearing capacity increases by 2.1%and the ultimate displacement decreases by 16.98%.For the sane concrete strength,when the working coefficient decreases from 0.40 to 0.36,the ductility increases by 36.97%.The change of the working coefficient caused by flanges has an evident influence on the ductility of specimens.When the displacement angle of the PEC columns is 1/35,their bearing capacity degradation coefficients are between 0.95 to 0.99,while their displacement ductility coefficients are between 3.61 to 4.25;the columns can still maintain good bearing capacity and their energy dissipation coefficients are all above 2.0.The PEC columns with high strength concrete are shown to have good energy dissipation and seismic performance,and is thus suitable for use in seismic zones.

关 键 词：PEC柱 高强混凝土 H形钢 拟静力试验 混凝土工作系数 抗震性能 

分 类 号：TU398.703[建筑科学—结构工程]