碱镁混凝土大偏心受压柱的试验研究  

Study on large eccentric compression column of basic magnesium sulfate cement concrete

作　　者：曾翔超[1] 余红发[1] 

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》2017年第6期852-858,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(U1407104);江苏省优势学科资助项目(PAPD)

摘　　要：碱镁混凝土具有快凝、早强、高强、抗水、抗腐蚀等优点。本文进行了碱镁混凝土和普通混凝土大偏压柱对比试验。由于现行的普通混凝土大偏压柱极限承载力计算公式不适用于碱镁混凝土柱,因此提出了针对碱镁混凝土大偏心受压柱的修正公式。试验结果表明:碱镁混凝土大偏压柱在开裂弯矩、极限承载力等方面具有明显优势,破坏模式和普通混凝土相比有一定差异;配筋相同的碱镁混凝土大偏压柱,随着混凝土强度等级的提高,抗裂、抗弯承载力提高,但延性降低。Basic magnesium-sulfate concrete has the advantages of being fast-setting,having both early and high strength,and being resistant to water and corrosion. In order to explore the performance differences between basic and magnesium-sulfate concrete,we conduct comparison tests on large-eccentricity columns. The results show that the column made from concrete containing magnesium sulfate has advantages in relation to cracking bending moment and ultimate bearing capacity,and that some differences exist in relation to failure modes in comparison with the common-concrete column. For magnesium-sulfate-concrete large-eccentricity columns with the same rebar content,cracking resistance and bending resistance increase with concrete strength,but the ductility decreases. Because the existing formula for calculating the ultimate bearing capacity of a common-concrete large-eccentricity column is not applicable to an alkali magnesium-sulfate large-eccentricity compressive concrete column,we propose a revised formula that is applicable.

关 键 词：碱镁水泥 混凝土 配合比 受压柱 承载力 偏心柱 

分 类 号：TU528[建筑科学—建筑技术科学]