碳纤维筋混凝土梁受剪性能试验研究

发布时间：2018-06-20 13:59

本文选题：FRP筋 + 珊瑚骨料混凝土梁　；参考：《西南科技大学》2017年硕士论文

【摘要】：纤维增强复合材料(FRP)筋珊瑚骨料混凝土已成为岛礁基础设施建设领域的一个研究热点,而目前FRP筋混凝土结构的研究主要集中在FRP筋混凝土受弯构件的力学性能上,对受剪构件的研究相对较少。美国、加拿大、英国、日本、中国均建立了FRP筋混凝土的设计规范,但规范中均未规定当混凝土种类为珊瑚骨料混凝土时现行规范的相关内容是否适用,也没有考虑剪跨比对FRP筋混凝土梁受剪承载力的影响。本文针对FRP筋珊瑚骨料(普通)混凝土梁试验,主要开展了以下几个方面的研究工作:(1)通过2根CFRP筋珊瑚骨料混凝土梁和2根CFRP筋普通混凝土梁的受剪试验,探讨并总结了不同工况下试验梁的试验现象与破坏形态;分析了不同配箍率、纵筋配筋率以及不同剪跨比等因素对梁开裂荷载、极限承载力和挠度的影响规律。结果表明:试验梁挠度随着剪跨比增大而增大,随着混凝土弹性模量的提高其挠度增大速率较慢,相同荷载等级下的梁挠度也较低,且配箍率对试验梁挠度基本没有影响;试验梁抗剪承载力在一定范围内,随着配箍率、混凝土强度的增大而提高,随着剪跨比的增大而减小;纵筋配筋率对试验梁抗剪承载力影响作用主要与纵筋弹性模量有关。验证了未考虑剪跨比影响的我国现行规范中FRP筋混凝土梁受剪承载力计算公式还有待修正。(2)考虑剪跨比对FRP筋混凝土梁抗剪承载力的影响,提出了修正系数K,并通过对33根FRP筋混凝土受剪梁试验数据的分析,推导拟合了系数K的表达形式,最终将考虑剪跨比影响的公式带入试验数据进行计算,验证了计算公式用于FRP筋珊瑚骨料混凝土梁的适用性,对今后FRP筋同时用作纵筋和箍筋的混凝土梁设计提供参考,为以后的工程实践提供一定的借鉴意义。
[Abstract]:Fiber reinforced composite (FRP) reinforced coral aggregate concrete has become a research hotspot in the field of island and reef infrastructure construction. At present, the research of FRP reinforced concrete structure is mainly focused on the mechanical properties of the flexural members of the FRP reinforced concrete, and the research on the shear members is relatively small. The design specification of FRP reinforced concrete is made, but the relevant contents of current specifications are not applicable when concrete types are coral aggregate concrete, and the effect of shear span ratio on shear bearing capacity of FRP reinforced concrete beams is not considered. In this paper, the following several experiments have been carried out on the concrete beams of FRP reinforced coral aggregate (general pass). The research work is as follows: (1) through the shear test of 2 CFRP reinforced coral aggregate concrete beams and 2 CFRP reinforced ordinary concrete beams, the test and failure modes of the test beams under different conditions are discussed and summarized, and the cracking load, ultimate bearing capacity and deflection of the beams with different stirrup rates, the reinforcement ratio of the longitudinal reinforcement and the shear span ratio are analyzed. The results show that the deflection of the test beam increases with the increase of the shear span ratio. With the increase of the elastic modulus of the concrete, the deflection increases slowly, the deflection of the beam under the same load is lower, and the ratio of the stirrup has no effect on the deflection of the test beam; the shear bearing capacity of the test beam is within a certain range, with the stirrup rate and the coagulation of the beam. The increase of soil strength decreases with the increase of shear span ratio, and the effect of reinforcement ratio on shear bearing capacity of the test beam is mainly related to the elastic modulus of longitudinal reinforcement. It is verified that the formula of shear bearing capacity of FRP reinforced concrete beams without considering the influence of shear span ratio is still to be corrected. (2) considering the mixing ratio of shear span to FRP reinforcement The influence of the shear bearing capacity of the concrete beam is proposed, and the correction coefficient K is proposed. Through the analysis of the experimental data of 33 FRP reinforced concrete shear beams, the expression of the coefficient K is deduced. Finally, the formula of shear span ratio influence is taken into the test data to be calculated, and the applicability of the formula to the FRP reinforced coral aggregate concrete beam is verified. It will provide a reference for the design of concrete beams with FRP bars used as longitudinal reinforcement and stirrup in the future, which will provide some reference for future engineering practice.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU377.9

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