徐梁晋, 王义博, 张志刚, 林昕, 张超. 预制ECC管混凝土桥墩拟静力试验研究[J]. 工程力学, 2021, 38(5): 229-238. DOI: 10.6052/j.issn.1000-4750.2021.01.0055
引用本文: 徐梁晋, 王义博, 张志刚, 林昕, 张超. 预制ECC管混凝土桥墩拟静力试验研究[J]. 工程力学, 2021, 38(5): 229-238. DOI: 10.6052/j.issn.1000-4750.2021.01.0055
XU Liang-jin, WANG Yi-bo, ZHANG Zhi-gang, LIN Xin, ZHANG Chao. QUASI-STATIC TEST STUDY ON PRECAST ECC CONCRETE-FILLED TUBULAR BRIDGE PIERS[J]. Engineering Mechanics, 2021, 38(5): 229-238. DOI: 10.6052/j.issn.1000-4750.2021.01.0055
Citation: XU Liang-jin, WANG Yi-bo, ZHANG Zhi-gang, LIN Xin, ZHANG Chao. QUASI-STATIC TEST STUDY ON PRECAST ECC CONCRETE-FILLED TUBULAR BRIDGE PIERS[J]. Engineering Mechanics, 2021, 38(5): 229-238. DOI: 10.6052/j.issn.1000-4750.2021.01.0055

预制ECC管混凝土桥墩拟静力试验研究

QUASI-STATIC TEST STUDY ON PRECAST ECC CONCRETE-FILLED TUBULAR BRIDGE PIERS

  • 摘要: 该文提出了一种以预制ECC管作为浇筑模板的ECC管混凝土桥墩。为研究该桥墩抗震性能,设计并制作了1个普通钢筋混凝土桥墩试件(RC)和3个预制ECC管混凝土桥墩试件(ECC1~ECC3),其中:试件ECC1为基准试件;试件ECC2在加载过程中减小了轴压比;试件ECC3在塑性铰区预制ECC管内浇筑了ECC。通过拟静力试验得到了上述试件的开裂过程、破坏形态以及水平力-位移滞回曲线等试验结果。通过分析各试件极限承载能力、累计耗能、延性系数、刚度退化以及残余位移等抗震性能指标,对比了预制ECC管混凝土桥墩与普通钢筋混凝土桥墩抗震性能的差别,得到了轴压比和塑性铰区截面形式对预制ECC管混凝土桥墩抗震性能的影响。研究结果表明:墩身外侧ECC管有效防止了塑性铰区混凝土剥落后钢筋屈曲,明显改善了桥墩破坏形态,提升了桥墩变形能力,降低了桥墩的损伤程度;与普通钢筋混凝土桥墩相比,预制ECC管混凝土桥墩的滞回曲线更加饱满,累计滞回耗能更大,具有更好的耗能能力,其峰值荷载和延性系数分别比普通钢筋混凝土桥墩的高出了16.66%和42.15%;对于ECC管混凝土桥墩,当轴压比降低后,ECC管壁出现的裂缝数量减少,其耗能和承载力降低,但延性变形能力增强,刚度退化也有所减缓;塑性铰区采用全截面ECC,即在ECC管内浇筑ECC,能提升预制ECC管混凝土桥墩的耗能能力、承载能力和延性变形能力,但裂缝的发展和分布几乎没影响。

     

    Abstract: A precast ECC concrete filled tubular pier is proposed. To investigate the seismic performance of the novel pier, 1 normal reinforced concrete pier specimen (RC) and 3 precast ECC concrete-filled tubular pier specimens (ECC1~ECC3) are designed and fabricated, among which specimen ECC1 is a reference, specimens ECC2 and ECC3 are employed to study the influence of the axial compression ratio and of the section in plastic hinge region, respectively. The specimens are tested under the action of a pseudo-static load to obtain crack propagations, failure modes and hysteretic curves. The indicators of seismic performance (bearing capacity, energy dissipation, ductility coefficient, stiffness degradation, residual displacement, etc.) are also analyzed. It can be observed that the reinforcement buckling after concrete broken in normal RC piers is prevented by the precast ECC tube, which enables the novel pier with an improved failure mode, enhanced deformation capacity and reduced damage severity. Compared with normal RC piers, the novel piers exhibit better energy dissipation capacity. The bearing capacity and ductility coefficient of specimen ECC1 are 16.66% and 42.15% higher than those of specimen RC, respectively. The novel pier with a lower axial compression ratio fails with less cracks in the ECC tube, and exhibits poorer energy dissipation, lower bearing capacity, better deformability, and slower stiffness degradation. Besides, casting ECC in a precast ECC tube in the plastic hinge region can enhances the energy dissipation, bearing capacity, and deformability, but has little influence on the crack propagation.

     

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