预应力筋应力腐蚀后预应力混凝土梁受力性能研究

发布时间：2018-03-08 16:20

本文选题：预应力筋　切入点：应力腐蚀　出处：《南京理工大学学报》2014年06期 　论文类型：期刊论文

【摘要】：为研究预应力筋应力腐蚀对预应力混凝土梁承载力和耐久性的影响,设计制作了7根用人工坑蚀模拟预应力筋受应力腐蚀的预应力混凝土梁,进行静力受力性能试验。试验结果表明:预应力筋坑蚀后的预应力混凝土梁的开裂荷载、极限荷载低于普通预应力混凝土梁,并随坑蚀深度的增大而下降;增大预应力度可提高应力腐蚀预应力筋混凝土梁的开裂荷载;增大非预应力钢筋的配筋率可提高预应力混凝土梁的开裂荷载、极限荷载;随着坑蚀的增大,构件抗弯刚度迅速下降;提高预应力度可减缓构件抗弯刚度的下降,而增大非预应力钢筋的配筋率对抗弯刚度的影响则较小。根据该文预应力筋坑蚀后的预应力混凝土梁极限承载力计算公式得到的理论值与实测值相吻合,可供工程实践参考。
[Abstract]:In order to study the effect of stress corrosion of prestressed tendons on the bearing capacity and durability of prestressed concrete beams, seven prestressed concrete beams simulated by stress corrosion of prestressed tendons with artificial pit erosion were designed and fabricated. The experimental results show that the cracking load of prestressed concrete beams after pit erosion is lower than that of ordinary prestressed concrete beams and decreases with the increase of pit corrosion depth. The cracking load of prestressed concrete beams can be increased by increasing the degree of prestress, the cracking load and limit load of prestressed concrete beams can be increased by increasing the reinforcement ratio of non-prestressed steel bars. The bending stiffness of members decreases rapidly, and the decrease of flexural stiffness can be slowed down by increasing the degree of prestress. However, increasing the reinforcement ratio of unprestressed steel bar has little effect on the flexural stiffness. The theoretical value obtained from the calculation formula of ultimate bearing capacity of prestressed concrete beam after pit erosion is in good agreement with the measured value, which can be used as a reference for engineering practice.
【作者单位】：扬州大学建筑科学与工程学院;江苏大学土木工程与力学学院;东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家自然科学基金(50978224;51278230;51308490) 住房和城乡建设部科学技术计划项目(2013-K4-17) 江苏省自然科学基金(BK20130450) 江苏省高校自然科学基金(13KJB560015) 江苏省2012年度普通高校研究生科研创新计划项目(CXZZ12_0655) 东南大学混凝土及预应力混凝土结构教育部重点实验室开放基金扬州市科技计划项目(2012149)
【分类号】：TU378.2

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