Experimental and analytical research on the flexural behaviour of steel-ECC composite beams under negative bending moments

被引:66
作者
Fan, Jiansheng [1 ]
Gou, Shuangke [2 ]
Ding, Ran [3 ]
Zhang, Jun [3 ]
Shi, Zhengjie [2 ]
机构
[1] Tsinghua Univ, Beijing Engn Res Ctr Steel & Concrete Composite S, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China
[3] Tsinghua Univ, Dept Civil Engn, China Educ Minist, Key Lab Civil Engn Safety & Durabil, Beijing 100084, Peoples R China
关键词
Reinforced engineered cementitious composite; Steel-ECC composite beam; Negative bending moment; Tension stiffening; Crack width; Analytical model; ENGINEERED CEMENTITIOUS COMPOSITES; BOND BEHAVIOR; CONCRETE; PERFORMANCE; REINFORCEMENT; INTERFACE; SHRINKAGE; CRACKING;
D O I
10.1016/j.engstruct.2020.110309
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Due to the strain-hardening and multi-cracking properties, engineered cementitious composite (ECC) is a new solution to the cracking issue in the negative bending moment region of steel-concrete composite beams. This paper presents an experimental and analytical study on the flexural performance of composite steel-ECC beams subjected to negative bending moments as well as the tension stiffening behaviour of reinforced ECC (R/ECC) flange slabs. Three beams with different slab materials and reinforcement ratios were tested under a hogging moment. Experimental results demonstrated significant enhancement in stiffness and crack resistance for the steel-ECC composite beams. A practical four-parameter fibre-bridging model was established to describe the strain-hardening behaviour of different ECC materials. Then, a modified analytical tension-stiffening model for R/ECC was formulated considering the strain-hardening behaviour of ECC and rebar-ECC bond-slip interaction based on the conventional tension-stiffening model for reinforced concrete. This modified model was verified by several direct tensile tests of R/ECC members. In addition, by applying the model to the traditional fibre beam-column element model, the mechanical performance and crack opening of general R/ECC structures were derived. The simulation results of the steel-ECC composite beams demonstrated satisfactory accuracy compared with the test results. Finally, a parametric study based on the new model was conducted to identify the influence of several important material and structural parameters on the flexural performance of steel-ECC composite beams under negative moments.
引用
收藏
页数:17
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