摘要
为研究开口型压型钢板-工程增强水泥基复合材料(ECC)组合楼板的受力性能,对开口型压型钢板-ECC组合楼板试件进行静力加载试验及数值模拟,研究了试件破坏模式、端部滑移、荷载-挠度曲线、压型钢板应变分布及承载能力;利用ABAQUS有限元程序对试件受弯承载性能进行模拟,数值模拟结果与试验结果符合较好;在此基础上,分析了ECC截面高度、ECC抗拉强度、压型钢板厚度及剪跨比对组合楼板受弯承载性能的影响。基于ECC受拉应变硬化特性,建立了考虑ECC受拉作用的开口型压型钢板-ECC组合楼板受弯承载力计算公式。结果表明:对于纵向剪切破坏的试件,压型钢板的受拉作用未得到完全发挥,加载后期试件端部发生明显滑移;在其他参数相同的情况下,端部配置栓钉及抗剪钢筋的试件发生弯曲破坏,压型钢板达到全截面屈服,其峰值承载力为纵向剪切破坏试件的2.1倍~2.31倍;ECC截面高度在几个因素中对组合楼板受弯承载力的影响最为显著;所建立的计算公式能够较好地预测该类组合楼板的受弯承载力。
In order to study mechanical behavior of opened profiled steel sheet-engineered cementitious composite(ECC)slabs,static loading tests and numerical simulation were conducted on opened profiled steel sheet-ECC composite slabs to investigate destruction mode,end slip,load-deflection curve,strain distributions and bearing capacity.The flexural bearing behavior of specimens was simulated by ABAQUS,and the numerical simulation results agreed well with the test results.On this basis,the effects of ECC section height,ECC tensile strength,profiled steel plate thickness and shear span ratio on the flexural capacity performance of the composite slabs were analyzed.Based on the tensile strain hardening characteristics of ECC,a method for calculating the flexural capacity of opened profiled steel sheet-ECC composite slabs considering the tensile effect of ECC was established.The results show that for the specimens with longitudinal shear failure,the tensile efficacy of the profiled steel sheet is not utilized effectively,and the end slip develops obviously during the later loading.Under the same parameters,the specimens with studs and shear reinforcements at the ends behaves flexural failure,the profiled steel sheet yields,and its ultimate flexural capacity was 2.1 times to 2.31 times that of the specimens with shear failure.The ECC section height has the most significant impact on the flexural capacity of composite slabs among several factors.The proposed formula can better predict the flexural capacity of this type of composite slabs.
作者
白亮
宋莉莎
许卓轩
凌童
廖芳芳
BAI Liang;SONG Lisha;XU Zhuoxuan;LING Tong;LIAO Fangfang(School of Civil Engineering,Chang'an University,Xi'an 710061,Shaanxi,China)
出处
《建筑科学与工程学报》
CAS
北大核心
2024年第4期20-30,共11页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(51208058,51708035)
陕西省自然科学基础研究计划项目(2022JM-242,2021JM-164)
陕西省教育厅科学研究计划项目(21JP006)。
关键词
开口型压型钢板
ECC
组合楼板
受弯承载力
试验研究
数值模拟
opened profiled steel sheet
ECC
composite slab
flexural capacity
experimental investigation
numerical simulation
