PBL剪力连接件承载力试验

设计、制作了15组不同的PBL试件共44个,完成了极限承载力试验,研究分析了各种因素对PBL键极限承载力的影响,并将试验结果与栓钉极限承载力作了比较,也与各国专家提出的PBL键承载力计算公式所得结果作了比较。结果表明:PBL键承载力大、延性好;影响PBL键极限承载力的主要因素是钢板孔洞大小、贯通钢筋的大小和强度、混凝土强度和箍筋强弱;每个试件的孔洞个数和贯通钢筋个数以及试件尺寸等对PBL键单孔承载力也有影响;非紧套型试件的单孔极限承载力远大于与PBL键贯通钢筋同直径栓钉的单钉承载力,而且也大于贯通钢筋与混凝土榫的抗剪极限承载力之和;紧套型PBL键试件单孔极限承载力与同直径栓钉的极限承载力接近。

Experiment on Bearing Capacity of PBL Shear Connectors

Authors designed and made 44 PBL test samples composed of 15 different groups;accomplished the ultimate bearing capacity tests of the 44 test samples;studied and analyzed the influence of all kinds of factors on the ultimate bearing capacity of PBL shear connectors;compared the test results of PBL both with that of studs and with that of calculated results according to the PBL bearing capacity formula put forward by specialists at home and abroad and some conclusions were educed.The conclusions show that PBL has great bearing capacity and good ductility;the size of the holes on the steel plate,the size and strength of perforated rebar,the strength of concrete and the ratio of stirrup reinforcement are the main factors influencing the ultimate bearing capacity of PBL shear connectors;the number of holes and perforated rebar,the size of each test samples also have influence on the single ultimate bearing capacity of PBL shear connectors to some extent;the single hole ultimate bearing capacity of the close perforated PBL shear connectors is nearly same as the studs with same diameter as the perforated rebar;while the single hole ultimate bearing capacity of the unclose perforated PBL shear connectors is much greater not only than that of the studs with same diameter as the perforated rebar,but also than that of sum of the anti-shear ultimate bearing capacity of perforated rebar and concrete tenon.