摘要
通过3个缩尺检修门槽试件的静力试验,研究了不同配筋率下检修门槽试件的极限承载力与破坏模式。采用ABAQUS软件,在验证了计算结果与试验结果吻合良好的基础上,以拉西瓦水电站进水口检修门槽原型为对象,分析了不同剪跨比、水平钢筋布置形式对检修门槽破坏形态的影响,明确了检修门槽破坏模式及其荷载传递机理。结果表明:二期混凝土内无构造措施时,门槽受剪承载力高于其局部受压承载力;在满足局部受压承载力的条件下,剪跨比大于或等于0.18时门槽主要发生混凝土压杆失效引起的剪切破坏,剪跨比小于0.18时门槽主要发生局部滑移破坏;增加顺水流方向水平钢筋层数可提高检修门槽受剪承载力。
The ultimate bearing capacity and failure modes of the maintenance gate slot specimens with different reinforcement ratios were studied through static load tests of three scaled specimens.Based on ABAQUS,numerical simulation of the prototype of the Laxiwa Dam maintenance gate slot was conducted after the numerical model was validated by the experimental results.The failure modes and load transfer mechanism of the maintenance gate slot with different shear span ratios and reinforcement ratios were investigated.The results indicate that the shear capacity of the gate slot is higher than the local compressive bearing capacity if the second-stage concrete is cast without strengthening detailing.Provided that there is sufficient local bearing capacity,the gate slot mainly fails in shear due to the failure of the concrete compression strut if the shear span ratio is greater than 0.18,otherwise the local sliding damage is dominated.Adding the layers of the horizontal reinforcement along the water flow direction in the maintenance gate slot is able to effectively improve the shear bearing capacity.
作者
张涛
喻君
汪基伟
ZHANG Tao;YU Jun;WANG Jiwei(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)
出处
《水利水电科技进展》
CSCD
北大核心
2019年第6期88-94,共7页
Advances in Science and Technology of Water Resources
基金
中央高校基本科研业务费专项(2019B12814)
关键词
检修门槽
剪跨比
破坏模式
数值模拟
maintenance gate slot
shear span ratio
failure mode
numerical simulation
