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GFRP筋增强水泥基复合材料柱的抗侧向冲击性能及残余侧向承载性能试验研究
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Abstract:
近年来，船舶撞击桥墩柱的事故时有发生，在此类撞击作用下钢筋混凝土墩柱易出现损伤或发生破坏，可能导致桥梁上部结构局部或整体坍塌，造成惨重的损失。纤维增强复合材料(FRP)筋具有质量轻、抗拉强度高、耐腐蚀性良好等优点，水泥基复合材料(CBC)具有较高的强度、良好的致密性以及优异的抗裂性能等特点。FRP筋增强水泥基复合材料组合结构的抗冲击性能与设计是值得关注的问题。因此，本文针对这一问题开展研究，以玻璃纤维(GFRP)筋增强水泥基复合材料柱为研究对象，通过摆锤冲击试验和侧向静力加载试验相结合的方法，研究了组合柱的抗侧向冲击性能和冲击致损后的侧向残余承载能力。结果表明：相比于GFRP筋增强普通混凝土柱，GFRP筋增强水泥基复合材料柱具有更好的抗冲击性能，能够降低35%左右的峰值位移，而在静力承载方面，具有更大的侧向刚度和侧向承载力，其静态承载力提升了43%。
In recent years, ship collisions with bridge piers have occurred frequently. Under such impact loads, reinforced concrete piers are prone to damage or failure, which may lead to partial or complete collapse of the bridge superstructure, resulting in devastating losses. Fiber-reinforced polymer (FRP) bars offer advantages such as light weight, high tensile strength, and excellent corrosion resistance, while cement-based composites (CBC) exhibit high strength, good compactness, and superior crack resistance. The impact resistance and design of FRP-reinforced cement-based composite structures are therefore important issues worthy of attention. To address this, this study focuses on glass fiber-reinforced polymer (GFRP) bar-reinforced cement-based composite columns. Through a combination of pendulum impact tests and lateral static loading tests, the lateral impact resistance and residual lateral load-bearing capacity of the composite columns after impact damage were investigated. The results indicate that, compared to GFRP-reinforced normal concrete columns, GFRP-reinforced cement-based composite columns demonstrate better impact resistance, reducing peak displacement by approximately 35%. In terms of static load-bearing capacity, they exhibit greater lateral stiffness and lateral load-bearing capacity, with a 43% increase in static load-bearing capacity.
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