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均布荷载下混凝土灌芯纤维石膏板板梁的受力性能研究
Research on the Behavior of Lintels Builded with Concrete-filled Fiber-reinforced Plasterboard under Uniform Load
【作者】 李恒；
【导师】 姜忻良；
【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士
【摘要】 混凝土灌芯纤维石膏板结构体系是一种很有推广前途的结构体系,其发展和应用顺应了我国墙体材料改革的需要。为了替代砖混结构,切实实现混凝土灌芯纤维石膏板结构体系在我国的推广和应用,必须对该结构体系进行广泛的研究。门窗洞口上部的混凝土灌芯纤维石膏板板梁作为体系一个重要组成部分,研究其受力性能具有重要的理论意义和工程价值。纤维石膏板影响了混凝土灌芯纤维石膏板板梁的承载力,计算中应该考虑纤维石膏板的影响。本文通过对9根竖向均布荷载作用下混凝土灌芯纤维石膏板板梁的试验,分析了影响混凝土灌芯纤维石膏板板梁的正截面开裂荷载、抗弯承载力以及抗剪承载力的因素,推导了竖向荷载作用下混凝土灌芯纤维石膏板板梁的正截面抗裂、抗弯承载力以及斜截面抗剪承载力的计算公式。试验结果与计算结果进行了对比分析,两者符合良好,误差与一般混凝土梁相当,公式可以用于混凝土灌芯纤维石膏板板梁承载力的计算。而后本文利用大型通用有限元分析软件ANSYS进行了非线性有限元分析。分析结果与实测结果吻合较好,表明ANSYS计算分析混凝土灌芯纤维石膏板板梁的可行性。最后将试验中未考虑的影响混凝土灌芯纤维石膏板板梁斜截面承载力因素进行了定性计算分析。
【Abstract】 Concrete-filled fiber-reinforced plasterboard(CFFRP)structure is a promising structural system. Its developments and applications are the need of reformation of wall material of china. In order to replace masonry structure and realize the introductions and applications of this structure in china, CFFRP structure is studied preliminarily. Lintel builded with concrete-filled fiber-reinforced plasterboard is an important part of CFFRP structure, so studying the appearance of the lintels has an important theoretical significance and engineering value.Fiber-reinforced plasterboard affects carrying capacity of lintels builded with concrete-filled fiber-reinforced plasterboard, which should be taken into account. Based on the experiment studies of 9 lintels builded with concrete-filled fiber-reinforced plasterboard under uniform load, this paper not only discusses the elements that affect initial strength, bending capacity and shear strength. But also gives out calculated formulas that can calculate the load for initial strength, bending capacity and shear strength.Contrasting our and Austrilian experimental values with calculated formula of the paper, the results indicated that this formula suggested by this paper could estimate the load properly.By using general finite element modeling software-ANSYS, the lintels are made nonlinear finite-element analysis. The calculated results are much coincided with the tested results, which proved the feasibility of software-ANSYS to calculate structure of concrete-filled fiber-reinforced plasterboard. By using ANSYS, the other elements that affect the shear strength of concrete-filled fiber-reinforced plasterboard are also discussed.