塑性鉸區(qū)采用纖維增強(qiáng)混凝土柱變形能力計(jì)算方法研究*
秦瑋琳1，梁興文1，徐潔2，段小東3，張博3
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（1 西安建筑科技大學(xué)土木工程學(xué)院, 西安 710055； 2 陜西工業(yè)職業(yè)技術(shù)學(xué)院土木學(xué)院, 咸陽 712000；3 中國建筑西北設(shè)計(jì)研究院有限公司， 西安 710018）
［摘要］采用簡(jiǎn)化的纖維增強(qiáng)混凝土應(yīng)力-應(yīng)變關(guān)系，根據(jù)截面力的平衡方程和截面變形的平截面假定，推導(dǎo)出塑性鉸區(qū)采用纖維增強(qiáng)混凝土柱不同極限狀態(tài)時(shí)的曲率。根據(jù)柱的曲率分布規(guī)律，推導(dǎo)出由柱彎曲變形所引起的柱頂水平位移；采用Sezen模型推導(dǎo)出由柱底縱筋與混凝土粘結(jié)滑移所引起的柱頂水平位移，再考慮柱剪切變形引起的柱頂水平位移就得到總的柱頂水平位移。與試驗(yàn)結(jié)果對(duì)比表明，塑性鉸區(qū)采用纖維增強(qiáng)混凝土柱在開裂荷載、屈服荷載、峰值荷載、極限荷載作用下的位移計(jì)算值與試驗(yàn)值吻合較好。［關(guān)鍵詞］纖維增強(qiáng)混凝土; 鋼筋混凝土柱; 變形能力; 位移中圖分類號(hào)：TU377.9+4 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)20-0063-06
Study on calculation method for deformability of reinforced concrete columns with fiber reinforced concrete in plastic hinge regionQin Weilin1, Liang Xingwen1, Xu Jie2, Duan Xiaodong3, Zhang Bo3(1 School of Civil Engineering, Xi′an University of Architecture and Technology, Xi′an 710055, China; 2 School of Civil Engineering, Shaanxi Polytechnic Institute, Xianyang 712000, China; 3 China Northwest Architecture Design and Research Institute Co., Ltd., Xi′an 710018, China)Abstract: The curvatures of reinforced concrete columns with fiber reinforced concrete in plastic hinge region in different ultimate limit states were derived according to the simplified fiber reinforced concrete stress-strain relationship as well as section force static equilibrium equation and plane cross-section assumption of section deformation. According to the curvature distribution law of the column, the top horizontal displacement caused by the column bending deformation was derived. The Sezen model was used to derive the top horizontal displacement caused by the bond-slip between longitudinal reinforcement and concrete at column bottom. The top horizontal displacement caused by shear deformation was considered as well. Above all, the total horizontal displacement was obtained. Compared with the test results, the calculated displacements under the actions of cracking load, yield load, peak load and ultimate load are in good agreement with the test results when the fiber reinforced concrete is adopted in plastic hinge region of reinforced concrete columns.Keywords: fiber reinforced concrete; reinforced concrete column; deformability; displacement
*國家自然科學(xué)基金項(xiàng)目(51278402，51078305)。作者簡(jiǎn)介：秦瑋琳，碩士研究生，Email:13228060426.com@163.com。
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