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以钢纤维为焊接材料连接两梁,研究延长后梁的耐久性。给出了16根大面积粘贴钢纤维的简支梁和4根普通简支梁三点受荷的试验结果。这16根梁共用了36根(截面尺寸:200mm×220mm,长度1000mm)等截面混凝土构件。选用的试验参数为节点的类型、梁分段的长度和段数及钢纤维的体积率。试验中采用了3种节点长度(100,200,300mm),2种钢纤维的体积率(2%和3%)。记录了梁的荷载-挠度曲线、开裂和破坏特征及抗弯承载力。结果表明,节点长度300mm且钢纤维体积率为2%的梁的抗弯性能与对照梁接近。说明钢纤维加固混凝土技术在保证梁抗弯能力的同时,也满足耐久性的要求。
Steel fiber as the welding material to connect the two beams to study the durability of the extended beam. The test results of three points of simple supported beam with four large area affixed with steel fiber and four ordinary simply supported beams are given. These 16 beams share 36 pieces (section size: 200 mm × 220 mm, length 1000 mm) and other cross-section concrete members. The test parameters used are the type of node, the length and number of beam sections, and the volume fraction of steel fiber. Three kinds of node length (100,200,300mm) and two kinds of steel fiber volume fraction (2% and 3%) were used in the experiment. The load-deflection curves, cracking and failure characteristics and flexural capacity of beams were recorded. The results show that the flexural strength of the beam with 300mm node length and 2% steel fiber volume fraction is close to that of the control beam. This shows that the steel fiber reinforced concrete technology meets the durability requirements while guaranteeing the beam bending resistance.