建筑结构

2019, v.49;No.494(02) 29-35+42

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可用于无筋建造的超高延性水泥基复合材料力学性能研究
Research on mechanical property of ultra-high ductility cementitious composites in construction without steel reinforcement

俞可权;余江滔;李凌志;董方园;王义超;詹凯利;
Yu Kequan;Yu Jiangtao;Li Lingzhi;Dong Fangyuan;Wang Yichao;Zhan Kaili;College of Civil Engineering,Tongji University;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education;

摘要(Abstract):

为了验证超高延性水泥基复合材料(Ultra-high ductility cementitious composites,UHDCC)用于无筋建造的可行性,进行了材料、构件和结构三个层面的力学试验。试验结果显示,UHDCC的抗拉强度介于5~20MPa之间。在峰值应力处,UHDCC的平均拉伸应变达8%,最大拉伸应变可达12%以上,具有超强的拉伸强化特性; UHDCC的抗压强度介于30~120MPa之间,在某些地震强度范围内表现出罕见的抗压应变强化的特性;四点弯曲试验显示,UHDCC无筋梁的承载力相当于配筋率0. 5%~1. 5%的普通钢筋混凝土梁,达到极限承载力时,其变形均超过1/50的挠度,具备良好的抗弯和抗剪承载力及变形能力。偏心受压试验显示,UHDCC无筋柱的承载力接近配筋率为0. 8%的高强混凝土柱,并比高强混凝土柱具有更好的变形能力。通过振动台试验,对比研究了7度(0. 105g)模拟多遇地震到9度(1. 178g)模拟罕遇地震下钢筋混凝土框架(柱配筋率2. 3%)和UHDCC组合框架的抗震性能。UHDCC组合框架显示出自增强阻尼性能和良好的耗能能力,具备与钢筋混凝土框架相近的抗震能力。
To evaluate the feasibility of ultra-high ductility cementitious composites( UHDCC) developed for construction without steel reinforcement,a series of tests were carried out on the mechanical properties of UHDCC at material,component and structure levels. The tests for material properties indicate that the tensile strength of UHDCC is between5 MPa and 20 MPa,and the average tensile strain capacity of UHDCCs is 8% with the maximal tensile strain up to 12% at peak stress. UHDCC have super tensile strengthening characteristics. The compressive strength of UHDCC ranges from30 MPa to 120 MPa with a rare strain strengthening behavior occurred under the range of certain seismic strength. The results of four-point bending tests demonstrate the outstanding load bearing capacity and deformability of UHDCC beams. More specifically,the load bearing capacity of plain UHDCC beam is equal to that of conventional reinforced concrete( RC)beam with the steel reinforcement ratio of 0. 5% ~ 1. 5%; while the deflection-span ratio of UHDCC beams all exceed 1/50 at peak load. The eccentric compression test on UHDCC columns and high-strength RC column shows that the loading capacity of UHDCC column is close to that of high-strength RC column with a steel ratio of 0. 8%,and the former has better deformation ability. Additionally,shaking tale tests were conducted on seismic performance of the RC frame( reinforcement ratios of columns were about 2. 3%) and the UHDCC composite frame under seismic excitations with the peak ground acceleration ranging from 0. 105 g to 1. 178 g,and the latter exhibited better energy-dissipating capacity with self-reinforced damping capacity. UHDCC composite frame has seismic capacity similar to that of reinforced concrete frame.

关键词(KeyWords): 无筋建造;应变强化;延性;水泥基复合材料;抗震性能
construction without steel reinforcement;strain strengthening;ductility;cementitious composites;seismic performance

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基金项目(Foundation): 国家自然科学基金(51778461)

作者(Author): 俞可权;余江滔;李凌志;董方园;王义超;詹凯利;
Yu Kequan;Yu Jiangtao;Li Lingzhi;Dong Fangyuan;Wang Yichao;Zhan Kaili;College of Civil Engineering,Tongji University;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education;

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