再生粗骨料混凝土梁抗弯性能试验研究  

作　　者：肖建庄[1] 兰阳[1,2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]中铁大桥勘测设计院有限公司武汉430050,上海200092

出　　处：《特种结构》2006年第1期9-12,共4页Special Structures

基　　金：上海市科学技术委员会资助项目(编号:04DZ05044)

摘　　要：通过对3根相同配筋率、相同混凝土抗压强度、不同再生粗骨料取代率的再生混凝土简支梁的抗弯试验,探讨了再生混凝土受弯构件正截面受力变形性能和破坏特征。试验结果表明:再生混凝土梁正截面在受力过程中,仍具有弹性、开裂、屈服和极限4个明显特征;正截面平均应变服从平截面假定;相同条件下,再生混凝土梁的开裂弯矩和极限抗弯承载能力接近于普通混凝土受弯构件,抗弯刚度小于普通混凝土受弯构件。最后,本文根据现行《混凝土结构设计规范》(GB50010-2002)提出的普通混凝土梁的计算公式,验算了再生混凝土梁的开裂弯矩、极限弯矩、挠度和最大裂缝宽度。初步验算结果表明,除极限弯矩计算公式外,普通混凝土梁的开裂弯矩、挠度和最大裂缝宽度计算公式均不再适用于再生混凝土梁。The intent of this paper is to investigate the flexural behavior of simply-supported recycled concrete beams with same percentage of reinforcement and axial compressive strength but different replacement ratio of recycled coarse aggregate. Besides the flexural capacity, the characteristics of both deflection and cracking are analyzed. Based on the experimental results, the following conclusions are drawn. In bending, the recycled concrete beam also has elastic, cracking, yield and ultimate point. The average strain measured on cross-section obliges to the plane section assumption. Under same conditions, the cracking and ultimate moment of recycled concrete beam are similar to conventional concrete beam, however, the stiffness of recycled concrete beam reduces somewhat. At the end of this paper, after verifying the formula suggested by present code for Design of Concrete Structures （GB50010-2002） for recycled concrete beams, a conclusion can be drawn that the ultimate moment of recycled concrete beam can be estimated by the formula suggested by present code, whereas the cracking moment, the deflection and the width of crack can not.

关 键 词：再生混凝土 梁 再生粗骨料 抗弯性能 

分 类 号：TU375.1[建筑科学—结构工程] TU398.9