钢筋混凝土抗震框架节点受力机理及轴压比影响的试验_傅剑平概述.pdf

DO I :10.14006/j .jzjgxb .2006.03.009 27 3 2006 6 :1000 -6869(2006)03 -0067 -11 　　　　　 Journal of Building Structures Vol .27, No .3 June 2006 傅剑平 , 张 　川 , 陈 　滔 , 白绍良 ( , 400045) : 19 , , , 。 : ;; :TU375.4 　TU317.1　　 。 ;(3) ; :A ; , , , , ;(2) :(1) Experimental investigation of shear mechanism and effect of axial-compression ratio on joints in earthquake-resistant reinforced concrete frames FU Jianping , ZHANG Chuan , CHEN Tao , BAI Shaoliang (College of Civil Engineering , Chongqing University , Chongqing 400045 , China) Abstract :Reversed cyclic tests of 19 nearly full-scale interior beam-column joints of reinforced concrete frames , with different shear compression ratios and axial compression ratios , were carried out to investigate the shear transfer mechanism in the joint and the effect of the axial compression ratio to the seismic behavior of the joint .The conclusions are drawn as follows :(1) Bond slip of the beam rebars from the joint is significantly decreased as the axial compression ratio increases .At higher level of shear in the joint , the bond deterioration of beam rebars has increased ;(2)Measurements on the stirrup strains in the joint show that the stirrup lag parallel in the direction of acting force not only sustains the tension in the truss mechanism , but also confines the reversed cyclic diagonal compressive concrete strut in the joint core ;(3)It is confirmed that when the acting shear in the joint is moderate or greater , increase of the axial compression ratio is significantly unfavorable to the ductility in seismic shear . Keywords :reinforced concrete frame ;seismic design ;beam-column joint ;axial-compression ratio ;confinement of stirrups 1　 90 , [ 1] 。 ; 、 ,, , 、 : : 。 :2005 (1953 - 　), 7 , 。 , , ACI318 《 ASCE Committee 352《 [ 2] , 》[ 3] ACI- 67 》[ 4] 。 :(1) , ? (2) 、 , J K Wight , [ 5] ; 、 20 , , 90 , , ? 、 [ 6 , 7] , , , , 。 , 。 ? 、 2　 19 , 1。 λ= Vjh/(f cbj hj) n = N/ (f cbchc) [ 5] 。 V jh Vjh =(As fyu +A′s f yb)-Vc , , As