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发表时间：2020-01-01

发表刊物：Journal of Shenyang Jianzhu University. Natural Science

所属单位：建设工程学部

卷号：36

期号：3

页面范围：385-394

ISSN号：2095-1922

关键字："U-stirrup; BFRP strengthened concrete beams; concrete crack; extended finite element"

CN号：21-1578/TU

摘要：In order to study the effect of two types of U-stirrups anchored at the end of the beam and along the whole beam on the reinforced concrete beams strengthened by basalt fiber reinforced plastic(BFRP), two specimens from the experiment are specified as the study objects in this paper. Through applying Extended Finite Element to simulate concrete cracking and Cohesive Zone Element to calculate the bonding stress between BFRP and concrete,the crack propagation, interfacial stress,BFRP stress and failure mechanism of BFRP strengthened concrete beams are analyzed. The results show that the ultimate bearing capacity of the BFRP strengthened beam with U-stirrup at two ends is higher than that of the U-stirrup along the whole beam. With the increase of load, the locally high stress at the crack position moves to both sides,and the interfacial stress and the tensile stress of BFRP are more evenly distributed along the whole beam,which can produce debonding failure on the interface. However, the local stress of BFRP increases rapidly at the crack position between two U-stirrups for the whole beam anchorage,which can generate local BFRP rupture. When there are only shear cracks developed in BFRP reinforced concrete beams, the strengthening effect of the whole beam U-anchorage is better than that of the end U-anchorage. In this case,BFRP reinforced concrete beam is of higher loading capacity and smaller deformation.

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