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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >LONG-TERM TESTS ON CFRP SHEAR RETROFITTED BEAMS: ULTIMATE CAPACITY
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LONG-TERM TESTS ON CFRP SHEAR RETROFITTED BEAMS: ULTIMATE CAPACITY

机译：CFRP抗剪梁的长期测试：极限容量

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摘要

Two long-term load tests were conducted as part of an ongoing investigation of the use of CFRP straps to enhance the shear capacity of reinforced concrete beams. One strengthened T-beam specimen was exposed to a sustained load for,260 days while a second specimen was exposed to 2.1 million load cycles. After the long-term tests, both specimens were tested to failure to determine what impact, if any, the long-term loading had on the ultimate beam capacity and the CFRP strap behaviour. It was found that creep in the concrete meant that the sustained load specimen failed at a lower load due to a reduced lever arm between the concrete and the longitudinal steel. On the other hand, the cyclic load specimen had the same ultimate capacity as a specimen that was not placed under a long-term load. The CFRP strap strains were affected by the type of long-term loading with the straps on the cyclic load specimen having higher residual strains. This is believed to be due to the fact that load cycling causes the crack interface to deteriorate leading to larger crack widths and higher strap strains. The straps in both the long-term specimens had reserve strength capacity at the beam failure load.
机译：作为对CFRP皮带使用以增强钢筋混凝土梁的抗剪承载力的一项持续研究的一部分，进行了两项长期载荷测试。一个加强的T型钢试样承受了260天的持续载荷，而第二个试样则承受了210万次载荷循环。在长期测试之后，对两个样本进行了测试，以判定长期载荷对极限梁容量和CFRP绑带性能有何影响（如果有的话）。已经发现，混凝土中的蠕变意味着由于混凝土和纵向钢之间的杠杆臂减少，承受的荷载样本在较低的荷载下失效。另一方面，循环荷载试样的极限承载力与未长期承受荷载的试样相同。 CFRP带的应变受长期载荷类型的影响，循环载荷试样上的带具有较高的残余应变。认为这是由于载荷循环导致裂纹界面劣化而导致较大的裂纹宽度和较高的带应变的事实。两个长期样本中的带在梁破坏荷载下均具有储备强度。

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