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本文进行了14根粱裂缝试验研究,其中2根参考粱为瞢通钢筋混凝土梁,12根为玄武岩增强钢筋混凝土梁.在试验的基础上,分析了纤维掺置,纤维长度以及配筋率对粱裂缝情况的影响.试验表明,纤维掺量越高,长度越长,配筋率越高,对裂缝控制效果越明显. 相似文献
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The lifeti me maintenance of a bridge can comprise amuch greater portion of the total lifeti me cost than theoriginal cost of construction because of deterioration.An opti mal maintenance programis the key to makingappropriate decisions to mini mize cost and maintain anappropriate level of safety.Life-cycle cost is a usefulconcept in reducing the overall cost and achieving anappropriate maintenance plan[1,2].It is difficult tomake a reliable esti mate of thelifeti me costs whenthefuture of the… 相似文献
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Through the experiments of 7 T-section composite beams, steel fiber reinforced self-stressing concrete （SFRSC） as the composite beam in the composite layer was studied under the hogging bending. The tests simulated composite layer tensile strain under the hogging bending of inverted loading composite beams, giving the relationship under the different fatigue stress ratios between fatigue cycles and steel bar’s stress range, crack width, stiffness loss and damage, etc., in composite layer. This article established fatigue life equation, and analyzed SFRSC reinforced mechanism to crack width and stiffness loss. The results show that SFRSC as the composite beam concrete has excellent properties of crack resistance and tensile, can reinforce the fatigue crack width and stiffness loss of composite beams, and improve the durability and in normal use of composite beams in the hogging bending zone. 相似文献
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干湿交替与荷载作用下CFRP加固混凝土梁的耐久性 总被引：1，自引：0，他引：1
对8根持载与恶劣环境作用后的碳纤维增强聚合物(CFRP)加固混凝土梁进行了试验研究.梁的尺寸为1700 mm×120 mm ×200 mm.首先采用4点分加栽方式对梁进行预裂,卸载后粘贴CFRP片材,然后放入腐蚀环境.影响因素考虑了干湿交替与持载水平(持载水平分别为30%和60%混凝土梁极限荷载).分析了干湿交替单一因素和荷载与干湿交替双重因素对CFRP加固梁的长期性能.试验结果表明:荷载与干湿交替双重因素对CFRP加固梁的承载力和破坏形态影响较大,这主要是由于CFRP与混凝土界面的劣化引起;对CFRP加固梁的刚度几乎没有影响. 相似文献
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