体外预应力高强混凝土两跨连续梁模型试验  

Model Test of Two Span High-Strength Concrete Continuous Beams with External Prestress

作　　者：李方元[1] 赵人达[1] 周益云[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2002年第5期500-504,共5页Journal of Southwest Jiaotong University

基　　金：高等学校博士学科点专项科研基金资助 (980 6 130 7)

摘　　要：为研究预应力和混凝土材料对高强度混凝土体外预应力连续梁的力学行为的影响 ,设计并完成了 4片体外预应力高强度混凝土连续梁模型的静载试验。试验结果表明 :体外预应力连续梁的裂缝分布和发展规律与无粘结预应力梁相似 ;采用钢纤维提高负弯矩区的开裂载荷是有效的 ,而且利用钢纤维增强可在一定程度上限制裂缝发展并在卸载后使裂缝闭合 ;普通钢筋对分散裂缝和限制裂缝发展有利。Four different high strength concrete continuous beams are designed with different external prestresses and made of different concrete materials (high strength concrete or steel fiber reinforced high strength concrete), and tested under static load to study their structural behaviors. The test results show that: the crack distribution and propagation of the externally prestressed continuous beams are similar to those of the non bond prestressed concrete; using steel fiber to improve the cracking load in negative moment region is effective, and the steel fiber reinforcement can not only hinder cracks propagation, but also cause cracks to close after unloading; and conventional reinforcing steel bars are favorable to separating cracks and restricting cracks propagation.

关 键 词：模型试验 高强混凝土 钢纤维混凝土 体外预应力连续梁 体外预应力混凝结构 结构力学 

分 类 号：TU378.203[建筑科学—结构工程]