钢筋混凝土桥墩延性加固试验研究

【作者】 马生强；

【导师】 宋一凡；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2005， 硕士

【摘要】 大量的试验研究和地震震害表明,在强烈地震作用下,桥梁墩柱的塑性铰区域遭到破坏较多,是由于墩柱的弯曲延性不足而导致。纤维增强材料及箍筋加固钢筋混凝土墩柱是目前引起广泛关注的加固方式。本文制作了四个钢筋混凝土柱式墩模型,按三种材料加固方式进行墩柱延性性能的试验研究,分析加固效果。 主要研究工作如下: 在综述桥梁延性抗震设计基本理论及方法的基础上,推导了圆形墩柱延性参数的求解方程,为加固墩柱分析奠定了理论基础。 以《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTJ023-85)标准设计的20m简支T梁桥墩为背景,按静力相似分析设计模型墩柱。模型墩柱的配箍率、配筋率、混凝土标号以及浇筑方法均与原型桥墩相似。在标准养护日期后,采用三种不同材料的加固方式:玻璃纤维布、芳纶纤维布以及环向箍筋对墩柱试件在有相同初应力的情况下分别进行加固。采用一维拟静力试验,试验加载采用位移控制,利用美国的MTS试验系统对四个墩柱试件进行延性试验,并采集数据信息。 通过滞回曲线、骨架曲线分析三种加固试验墩柱的延性性能。结果表明,与未加固柱相比,三种加固方式加固的墩柱,其最大抗力、延性和耗能性能均有提高,提高的大小依次是:芳纶纤维布、玻璃纤维布和环向箍筋。 从经济效益及材料强度发挥角度考虑,环向箍筋这种加固方式既可以提高墩柱的抗震延性又可以节省加固投资。本论文研究成果可供同类桥墩延性加固参考。更多还原

【Abstract】 A large number of experimented researches and earthquake indicate that most damages belong to the areas of plasticity hinge of piers in server earthquake, because piers lack curve ductility. Strengthening reinforced concrete piers with Fiber Reinforced Plastic (FRP) and hoop stirrup are extensively paid attention at present. The text makes four reinforced concrete pier models. Three of them are strengthened by three different materials and tested to research the ductile capacity of piers and analyzed strengthen effects.Main research work is as follows.On the basis of describing the basic theory and method of ductility anti-seismic design, the equations of circular piers’ ductile parameters are deduced, which establishes the theoretical foundation for analyzing strengthening piers’ ductility.The models are designed simply as the background with 20m simple T bridges designed of "Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts "(JTJ 023-85) and static force similitude. The ratio of reinforcement, reinforcement stirrup, concrete mark and laying method of piers are similar to prototype ones. After the standard maintenance date, three different materials are adopted in reinforcing piers: Glass Fiber Reinforced Plastic (GFRP), Aramid Fiber Reinforced Plastic (AFRP) and hoop stirrup reinforce pier models separately in the same original press and are compared with the one without reinforcement. One dimension simulation static test is adopted, which uses displacement control. MTS system of U.S.A is applied to test the ductility of four test piers and the test data information is collected.Three reinforcement test piers’ ductility is analyzed through hysteric curve and skeleton curve. The result expresses that the strengthened piers’ maximum resisting power ,ductility and dissipating energy capacity are all increased compared with un-strengthened. The order of increase is AFRP, GFRP and hoop stirrup.Considering from economic benefit and strength of materials’ exertion, strengthening piers with hoop stirrup not only increases the seismic ductility, but also saves strengthening investment. The research findings of the thesis can be supplied references to the same kind piers’ ductility strengthen.更多还原