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王震宇， 蘆學(xué)磊， 李偉， 王代玉
（哈爾濱工業(yè)大學(xué)土木工程學(xué)院，哈爾濱 150090）[摘要] 對6根剪跨比為3.5的碳纖維約束柱及2根未約束的對比柱進行了偽靜力試驗研究，考察了軸壓比、碳纖維包裹方式、混凝土強度等參數(shù)對碳纖維約束高強混凝土圓柱破壞機理及抗震性能的影響規(guī)律。試驗結(jié)果表明，高軸壓比下高強混凝土圓柱在塑性鉸區(qū)采用碳纖維約束后的破壞形態(tài)主要表現(xiàn)為彎曲破壞模式，柱的承載力和延性得到較大提高：對于剪跨比大于3的高強混凝土圓柱，當(dāng)塑性鉸區(qū)碳纖維布包裹長度為1.2 D~1.8D(D為柱直徑)范圍內(nèi)時，其抗震性能即可達到較好的效果，且對較高強度等級混凝土的約束效果更好。
[關(guān)鍵詞] 碳纖維布；高強混凝土；圓柱；高軸壓比；抗震性能Experimental research on seismic performance of lugh strength concrete
circular column confined with carbon fiber sheets at plastic hinge zone
Wang Zhenyu, Lu Xuelei, Li Wei, Wang Daiyu
(School of Civil Engineering,Harbin histitute of Technology,Harbin 150090 ,China)Abstract: Six high strength concrete circular columns confined with CFS and two normal columns are desigped and tested under axial load and cyclic lateral force. The shear span ratio of all columns is 3.5. The irfluence of three parameters, including axial compression ratio, pattern of CFS wrapping and concrete strength, on the ductile behavior and ability of energy dissipation of columns are taken into account. the main failure patterns as well as seismic performance of columns are analyzed. Test results indicate that under high axial compressive load and lateral force, flexural failures are the main pattern of high strength concrete circular columns corfined with CFS at plastic hinge zone. Wrapping CFS at plastic hinge zone of column can observably improve its ductility,energy dissipation and seismic performance. For columns which its shear span ratio are greater than 3.O,when the length of wrapped CFS is l.2D t0 1.8D(D is the diameter of circular column) at plastic hinge zone,the seismic performance of columns can be improved effectively and for higher concrete strength the effect of CFS restraint is better than that of lower concrete strength.
Keywords: carbon fiber sheets; high strength concrete; circular column; high axial compression ratio; seismic performance
