轻骨料混凝土梁弯曲性能试验研究  

Experimental research on flexural behaviors of lightweight concrete beams

作　　者：唐军务[1] 张琦彬[1] 雷霜如 黄长虹[1] 

机构地区：[1]海军工程大学后勤指挥与工程系,天津300450 [2]海军后勤部军港管理处,北京100841

出　　处：《河海大学学报（自然科学版）》2010年第3期269-273,共5页Journal of Hohai University(Natural Sciences)

摘　　要：通过对5根梁试件(2根轻骨料混凝土梁、1根纤维轻骨料混凝土梁和2根普通混凝土梁)的试验,研究了轻骨料混凝土受弯梁在单调荷载作用下的基本力学性能,包括破坏形态、正截面承载力、挠度变化规律和裂缝开展过程等,对轻骨料混凝土梁、纤维轻骨料混凝土梁和普通混凝土梁的受力性能进行了对比.结果表明:轻骨料混凝土梁、纤维轻骨料混凝土梁均能满足JGJ12—2006《轻骨料混凝土结构技术规程》的挠度限值要求;按照现行规程进行使用荷载下最大裂缝宽度的验算是足够安全的,但应用于纤维轻骨料混凝土梁时,宜作适当修正.Based on experiments on five beam specimens （two lightweight concrete beams,one fiber lightweight concrete beam,and two normal-weight concrete beams）,the mechanical properties of lightweight concrete beams under a unilateral load were studied,including failure patterns,bearing capacities,change of deflections,and development of cracks. The stress behaviors of the lightweight concrete specimens,fiber lightweight concrete specimen,and normal-weight concrete specimens were compared. The experimental results show that the lightweight concrete and fiber lightweight concrete specimens both meet the requirements of allowable values of deflection of the JGJ 12-2006 specification for lightweight concrete structures. It is safe to estimate the maximum crack width under service loads according to the formula of Specification JGJ 12-2006. However,the formula should be revised when it is used on fiber lightweight concrete beams.

关 键 词：轻骨料 混凝土梁 弯曲性能 挠度 裂缝宽度 聚丙烯纤维 

分 类 号：TU377.1[建筑科学—结构工程]