- 摘 要
-
（1 同濟(jì)大學(xué)土木工程學(xué)院， 上海 200092；2 工程結(jié)構(gòu)性能演化與控制教育部重點(diǎn)實驗室， 上海 200092）
［摘要］為了驗證超高延性水泥基復(fù)合材料（Ultra-high ductility cementitious composites，UHDCC）用于無筋建造的可行性，進(jìn)行了材料、構(gòu)件和結(jié)構(gòu)三個層面的力學(xué)試驗。試驗結(jié)果顯示，UHDCC的抗拉強(qiáng)度介于5～20MPa之間。在峰值應(yīng)力處，UHDCC的平均拉伸應(yīng)變達(dá)8%，最大拉伸應(yīng)變可達(dá)12%以上，具有超強(qiáng)的拉伸強(qiáng)化特性；UHDCC的抗壓強(qiáng)度介于30～120MPa之間，在某些地震強(qiáng)度范圍內(nèi)表現(xiàn)出罕見的抗壓應(yīng)變強(qiáng)化的特性；四點(diǎn)彎曲試驗顯示，UHDCC無筋梁的承載力相當(dāng)于配筋率0-5%～1-5%的普通鋼筋混凝土梁，達(dá)到極限承載力時，其變形均超過1/50的撓度，具備良好的抗彎和抗剪承載力及變形能力。偏心受壓試驗顯示，UHDCC無筋柱的承載力接近配筋率為0-8%的高強(qiáng)混凝土柱，并比高強(qiáng)混凝土柱具有更好的變形能力。通過振動臺試驗，對比研究了7度（0-105g）模擬多遇地震到9度（1-178g）模擬罕遇地震下鋼筋混凝土框架（柱配筋率2-3%）和UHDCC組合框架的抗震性能。UHDCC組合框架顯示出自增強(qiáng)阻尼性能和良好的耗能能力，具備與鋼筋混凝土框架相近的抗震能力。
［關(guān)鍵詞］無筋建造； 應(yīng)變強(qiáng)化； 延性； 水泥基復(fù)合材料； 抗震性能
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)02-0029-07
Research on mechanical property of ultra-high ductility cementitious composites in construction without steel reinforcement
Yu Kequan1, Yu Jiangtao1, 2, Li Lingzhi1, Dong Fangyuan1, Wang Yichao1, Zhan Kaili1
(1 College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education, Shanghai 200092, China)
Abstract: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 between 5MPa and 20MPa, 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 from 30MPa to 120MPa 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 0-105g to 1-178g, 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.
Keywords:construction without steel reinforcement; strain strengthening; ductility; cementitious composites; seismic performance
*國家自然科學(xué)基金（51778461）。
通訊作者：余江滔，博士，副教授，一級注冊結(jié)構(gòu)工程師，Email: yujiangtao@#edu.cn。
- 下載地址
-
