小剪跨比沙漠砂混凝土深梁短期刚度试验  

Short-term stiffness test of desert sand concrete deep beam with small shear-span ratio

作　　者：秦拥军[1,2] 李向阳 QIN Yongjun;LI Xiangyang(School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China;Xinjiang Civil Engineering Technology Research Center, Urumqi 830047, China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047 [2]新疆土木工程技术研究中心,乌鲁木齐830047

出　　处：《中国科技论文》2022年第4期418-422,共5页China Sciencepaper

基　　金：自治区高校科研计划自然科学项目(XJEDU2017I003)。

摘　　要：通过制作1根普通混凝土深梁和8根沙漠砂混凝土深梁来研究沙漠砂掺量、剪跨比、箍筋配筋率和混凝土强度等级对沙漠砂混凝土深梁挠度和短期刚度的影响,并采用中国混凝土结构设计规范和有效惯性矩法对深梁试件短期刚度进行理论值计算。结果表明:沙漠砂混凝土深梁试件跨中挠度随剪跨比和箍筋配筋率的增大而增大,随混凝土强度等级的增大而减小,随沙漠砂掺量的增加呈现先增大后减小的趋势;深梁试件开裂时的短期刚度采用中国混凝土结构设计规范得到的计算值与试验值更为接近,而在极限状态下采用有效惯性矩法对试件短期刚度进行理论值计算精度更高,其变异系数为0.125。By making one ordinary reinforced concrete deep beam and eight desert sand concrete deep beams,the effects of desert sand content,shear-span ratio,stirrup reinforcement ratio and concrete strength grade on the deflection and short-term stiffness of desert sand concrete deep beams were studied.The short-term stiffness of deep beam specimens was calculated by using the Chinese concrete structure design code and the effective moment of inertia method.The results show that the mid-span deflection of desert sand concrete deep beams increases with the increase of shear-span ratio and stirrups reinforcement ratio,and decreases with the increase of concrete strength grade.It firstly increases and then decreases with the increase of desert sand content.The short-term stiffness of deep beam specimens under cracking condition is closer to the experimental value by using the Chinese design code for concrete structures,while the theoretical value of short-term stiffness under the ultimate condition by using the effective moment of inertia method is more accurate,and the coefficient of variation was 0.125.

关 键 词：混凝土 深梁 挠度 短期刚度 有效惯性矩法 

分 类 号：TU521.1[建筑科学—建筑技术科学]