钢筋碱式硫酸镁水泥混凝土梁抗弯性能试验研究  

Flexural performance of steel-reinforced basic magnesium sulfate cement concrete beams

作　　者：曾翔超[1] 余红发[1] ZENG Xiangchao;YU Hongfa(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学土木工程系,江苏南京210016

出　　处：《哈尔滨工程大学学报》2018年第12期1933-1940,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(21276264);江苏省优势学科资助项目(PAPD)

摘　　要：为了探讨碱式硫酸镁水泥混凝土梁受弯状态下的力学性能与普通混凝土梁的异同,本文通过对16根不同配筋率、不同强度等级的碱式硫酸镁水泥混凝土梁进行抗弯试验,研究其正截面受力全过程和破坏形态。试验结果表明:平截面假定仍然适用;碱式硫酸镁水泥混凝土梁的破坏形态及承载力-挠度曲线与普通硅酸盐混凝土梁相似;碱式硫酸镁水泥混凝土梁开裂弯矩比普通混凝土梁高约20%;本文的碱式硫酸镁水泥混凝土梁抗弯承载力计算模型,考虑了受拉区混凝土的贡献,按构件整体截面在受荷过程中抗弯性能的降低来考虑梁的承载力;最大裂缝宽度计算公式需将现行计算公式乘以修正系数1. 5,挠度计算公式应乘以1. 1的修正系数。碱式硫酸镁水泥混凝土可代替普通混凝土用于梁正截面抗弯。To explore the difference in performance between reinforced basic magnesium sulfate cement concrete(BMSC)beams and conventional reinforced concrete(RC)beams,a series of experiments was conducted on 16 newly constructed BMSC beams that have different reinforcement ratios and different strength grades,to research the whole process of stress and failure shape in the front section.The experimental results show that the assumption of flat section is also applicable.The failure mode and capacity-deflection curve of the BMSC beams are similar to those of the conventional silicate concrete beam.The cracking moment of BMSC beams is about 20%higher than that of conventional RC beam.In the anti-bending capacity computation model of the BMSC beams,because of the contribution of the concrete in the tensile area,the bearing capacity of beam is calculated according to reduction of the flexural performance in the loading process of the whole component cross section.The formulas for calculating the maximum crack width and the deflection of the BMSC beams are equivalent to the corresponding formulas for conventional RC beams multiplied by correction coefficients of 1.5 and 1.1,respectively.BMSC can be used in the bending beams instead of PC.

关 键 词：碱式硫酸镁水泥混凝土 梁 弯曲 延性 破坏模式 极限承载力 挠度 最大裂缝宽度 

分 类 号：TU528[建筑科学—建筑技术科学]