碳纤维筋无粘结部分预应力混凝土梁受弯性能研究  

Experimental Study on Flexural Behavior for Partially Prestressed Concrete Beams with Unbonded CFRP Tendons

作　　者：孟履祥[1] 陶学康[1] 关建光[1] 徐福泉[1] 

机构地区：[1]中国建筑科学研究院结构所,北京100013

出　　处：《建筑结构》2006年第3期31-37,共7页Building Structure

摘　　要：研究以碳纤维筋为无粘结预应力筋和环氧涂层钢筋为非预应力筋的部分预应力混凝土梁的受弯性能。共进行了8根梁从混凝土开裂、裂缝开展直至梁受弯破坏的全过程试验。测定了梁的开裂弯矩,截面应变分布,变形的发展,裂缝出现、发展及分布情况。在实测碳纤维筋应力增量的基础上,提出了无粘结预应力碳纤维筋极限应力的经验计算公式,给出了碳纤维筋无粘结部分预应力混凝土梁的短期刚度及裂缝宽度的算法。The flexural behavior of partially prestressed concrete beams with unbonded prestressing CFRP tendons and epoxy coated steel bars is investigated, and the full-range tests are loaded for 8 beams until the failure. The cracking moment, strain distributions of cross-section, developments of deflection, and the growth and distribution of cracks are measured. On the basis of stress increments measured in the experiment for unbonded CFRP tendons, an empirical equation for estimating the ultimate stress in unbonded CFRP tendons is proposed. Furthermore, the methods are presented for calculating the short-term stiffness and the crack width.

关 键 词：无粘结预应力碳纤维筋 环氧涂层钢筋 部分预应力混凝土梁 极限应力 短期刚度 裂缝宽度 

分 类 号：TU378[建筑科学—结构工程] U448.35[建筑科学—桥梁与隧道工程]