摘要
为保证混凝土深受弯构件的服役寿命,分析了其在载荷作用下的力学性能,并检测其裂缝宽度。在制备4种不同剪跨比的混凝土深受弯构件后,制定加载方案。然后基于有限元模型分析构件在载荷下的应力分布情况,并通过构件受剪分析模型计算混凝土深受弯构件的受剪承载力,同时利用拉压杆模型检测裂缝宽度。试验结果显示:剪跨比能够直接影响构件的力学性能。剪跨比为0.26、载荷达到600 kN左右时,跨中位移最高值为8.6 mm;剪跨比为1.04、载荷为300 kN左右时,跨中位移达到12.5 mm,构件从剪切破坏状态变化成剪弯破坏;根据构件裂缝之间的受力情况,可以准确获取裂缝最大宽度值;剪跨比较大时,构件裂缝较宽位置,大部分均位于支座附近。
In order to ensure the service life of concrete members with deep bending,it analyzed their mechanical properties under load and measured their crack width.After four kinds of concrete deeply bending members with different shear-span ratios were prepared,the loading plan was made.Then,the stress distribution of concrete members under load was analyzed based on the finite element model,and the shear capacity of concrete members with deep bending was calculated by the shear analysis model,and the crack width was measured by the tension and compression bar model.The test results show that shear span ratio can directly affect the mechanical properties of components.When the shear span ratio is 0.26 and the load is about 600 kN,the maximum mid-span displacement is 8.6 mm.When the shear span ratio is 1.04 and the load is about 300 kN,the mid-span displacement reaches 12.5 mm,and the member changes from shear failure state to shear bending failure.According to the stress between cracks,the maximum width of cracks can be accurately obtained.When the shear span ratio is large,the member cracks are wide and most of them are located near the support.
作者
赵长歌
魏国安
皇民
ZHAO Changge;WEI Guoan;HUANG Min(Henan University of Engineering,Zhengzhou 451191,China;Henan Technical College of Construction,Zhengzhou 450000,China)
出处
《混凝土》
CAS
北大核心
2024年第2期30-33,38,共5页
Concrete
基金
国家自然科学基金“高烈度地震区山岭隧道抗减震耦合技术研究”(51809085)。
关键词
混凝土
深受弯构件
力学性能
裂缝宽度检测
受剪承载力
剪跨比
concrete
deeply bent member
mechanical properties
crack width detection
shear capacity
ratio of shear span to effective depth
