【作者】 王建波；

【导师】 贾金青；

【作者基本信息】 大连理工大学 ， 结构工程， 2012， 硕士

【摘要】 将C100级超高强混凝土应用于预应力钢骨混凝土梁结构中,形成的预应力钢骨超高强混凝土梁能够发挥超高强混凝土的抗压性能、后张预应力筋的抗拉性能,同时通过钢骨改善预应力超高强混凝土梁的延性,体现了结构材料高强低耗的思想。预应力钢骨混凝土梁是一种新型结构体系,受力性能特殊,国内外在预应力钢骨混凝土结构受力方面的研究,相关文献报道较多,但是,将超高强混凝土应用在预应力钢骨混凝土结构方面的研究未见报道；同时,预应力钢骨混凝土结构缺乏相关设计规范,使得预应力钢骨混凝土结构设计、施工缺乏强有力的理论支持。因此,进行预应力钢骨超高强混凝土梁的力学性能研究是非常必要的。本课题组成功申请了国家自然科学基金项目——预应力钢骨超高强混凝土桥梁受力性能与设计计算方法研究,基于21根预应力钢骨超高强混凝土梁静力荷载试验结果,对其进行了非线性数值模拟分析,主要工作如下：(1)在试验研究的基础上,基于试验数据,利用大型通用有限元软件ANSYS对预应力钢骨超高强混凝土梁建立分离式有限元模型,并对其实行位移加载,模拟试验梁抗弯力学性能。并将数值模拟结果与试验结果对比分析,结果表明,该模型所得的开裂荷载、极限荷载、钢筋屈服荷载以及荷载位移曲线与试验结果接近,验证了此分离式有限元计算模型是正确可行的。(2)通过比较同一参数的不同水平条件下试验梁的荷载位移曲线,研究和分析了试验各设计参数对预应力钢骨超高强混凝土梁的承载能力极限状态和正常使用极限状态的影响情况。更多还原

【Abstract】 Prestressed steel reinforced ultra-high-strength concrete beams can perform the compositive properties of ultra-high-strength concrete and post-tensioned tendons, since C100is used in prestressed reinforced concrete beam structure. This style of structure reflects the idea of high strength and low energy consumption of structural materials, furthermore, the steel can improve the ductility of prestressed ultra-high-strength concrete beams.Prestressed steel reinforced ultra-high-strength concrete structure is a new structural system, having special mechanical properties. At home and abroad, there are many research literatures in prestressed steel reinforced concrete structure, while almost no research literatures in prestressed steel reinforced ultra-high-strength concrete structure. Whether at home or abroad, the lack of design specifications makes the prestressed steel reinforced concrete structure lack of theoretical support in design and construction. So it is very necessary to do some research in mechanical properties of prestressed steel reinforced ultra-high-strength concrete beams.On the basis of the existing research, combined with the National Natural Science Foundation project-study on the mechanical behavior and calculation method of prestressed steel reinforced ultra-high-strength concrete bridge, static tests and non-linear numerical simulation on21prestressed steel reinforced ultra-high-strength concrete beams are operated. The main work is as follows:(1) On the basis of the existing study, the finite element program ANSYS is used to simulate the prestressed steel reinforced ultra-high-strength concrete beams subjected to bending under static load, and the calculated and experimental results are compared, in order to obtain comprehensive mechanical properties of prestressed steel reinforced ultra-high-strength concrete beams. The results, the cracking load, ultimate load, yield load of reinforcement and the load-displacement curve calculated from the analysis model are very close to the experimental results, which verifies the correctness of the finite element model.(2) Research and analysis are operated on the influence of the designed parameters over ultimate limit state and serviceability limit state of prestressed steel reinforced ultra-high-strength concrete beams, by comparing the load-displacement curves which have the same parameters but different levels.更多还原