固化期间缓黏结预应力混凝土梁承载力的试验研究
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摘要
为了探明固化期间缓黏结预应力混凝土梁的承载能力,制作了5根长3 300 mm、截面300 mm×400 mm的缓黏结预应力混凝土梁,每根梁直线布置3根缓黏结预应力钢筋,进行梁的抗弯承载力试验。首先将预应力混凝土梁分批次进行预应力钢筋张拉,然后分2批进行梁的承载力性能试验。在进行预应力钢筋张拉及承载力试验时采用邵氏硬度计测量试件缓黏结剂的固化程度。在抗弯承载力试验过程中,通过监测梁挠度、预应力钢筋两端的压力变化、裂缝分布等指标,探明预应力钢筋与混凝土之间的传力机理及梁的承载能力。结果表明:张拉时缓黏结剂固化程度对梁的开裂荷载影响较小,对极限荷载影响较大;缓黏结剂固化度低时,张拉的试件梁具有良好的力学性能;缓黏结剂未完全固化、预应力混凝土梁提前受荷时,其承载能力降低。
To investigate the bearing capacity of retard-bonded pre-stressed concrete( RBPC) beam in curing period,bending resistance capacity experiment of five RBPC beams with 3 300 mm in length and 300 mm × 400 mm in crosssection,which had arranged three straight retard-bonded pre-stressed steel bars in each beam,were carried out. At first,the pre-stressed steel bars of these RBPC beams were tensiled in batches,and then the bearing capacity experiment of these beams which were divided into two batches were carried out. Through the tension and bearing capacity tests of pre-stressed steel bars,the curing degree of retard-bond adhesive of each beam was measured by the shore durometer. To verify clearly the force transfer mechanism between pre-stressed steel bars and concrete and bearing capacity of these RBPC beams,the deflection,the pressure changes at the two ends of pre-stressed steel bar,the crack distribution and other parameters were measured. The results showed that the effects of curing degree of retard-bonded adhesive on tensioning had little impact on the cracking load,however it had a great impact on the maximum bearing capacity; the mechanical properties of the RBPC beams were good when the curing degree of the retard-bonded adhesive was low; the bearing capacity of the beams subjected to loads in advance was reduced when the retard-bonded adhesive was not fully cured.
To investigate the bearing capacity of retard-bonded pre-stressed concrete( RBPC) beam in curing period,bending resistance capacity experiment of five RBPC beams with 3 300 mm in length and 300 mm × 400 mm in crosssection,which had arranged three straight retard-bonded pre-stressed steel bars in each beam,were carried out. At first,the pre-stressed steel bars of these RBPC beams were tensiled in batches,and then the bearing capacity experiment of these beams which were divided into two batches were carried out. Through the tension and bearing capacity tests of pre-stressed steel bars,the curing degree of retard-bond adhesive of each beam was measured by the shore durometer. To verify clearly the force transfer mechanism between pre-stressed steel bars and concrete and bearing capacity of these RBPC beams,the deflection,the pressure changes at the two ends of pre-stressed steel bar,the crack distribution and other parameters were measured. The results showed that the effects of curing degree of retard-bonded adhesive on tensioning had little impact on the cracking load,however it had a great impact on the maximum bearing capacity; the mechanical properties of the RBPC beams were good when the curing degree of the retard-bonded adhesive was low; the bearing capacity of the beams subjected to loads in advance was reduced when the retard-bonded adhesive was not fully cured.
引文
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[2]土木学会.エポキシ樹脂を用いた高機能PC鋼材を使用するプレストレストコンクリート設計施工指―内部充てん型エポキシ樹脂被覆PC鋼より線[M].东京:丸善出版株式会社,2010.
[3]王占飞,马玥,王强,等.缓黏结预应力混凝土技术在日本的研究与应用[J].公路交通科技(应用技术版),2014,15(3):192-197.
[4]曹国辉,胡佳星,张锴,等.缓黏结预应力混凝土梁极限承载力试验[J].公路交通科技,2013,30(6):49-55.
[5]熊学玉,沈土富,刘华良.缓黏结预应力技术探讨[J].建筑施工,2004,26(1):52-53,65.
[6]熊小林,李金根,李一心.缓黏结预应力筋摩阻损失的试验研究[J].建筑技术,2008,39(12):943-946.
[7]吴转琴,曾昭波,尚仁杰,等.缓黏结预应力钢绞线摩擦系数实验研究[J].工业建筑,2008,38(11):20-23.
[8]范蕴蕴,吴转琴,周建锋,等.缓黏结预应力钢筋用胶粘剂材料研究[J].工业建筑,2008,38(11):6-8,16.
[9]吴转琴,尚仁杰,洪光,等.缓黏结预应力钢绞线与混凝土黏结性能试验研究[J].建筑结构,2013,43(2):68-70.
[10]张建玲,宋玉普.缓黏结混合配筋预应力混凝土梁裂缝宽度的试验研究[J].土木工程学报,2008,41(2):54-59.
[11]赵建昌,李永和,王起才.新型缓黏结预应力体系试验研究[J].建筑结构学报,2005,26(2):52-59.
[12]赵建昌,王起才,李永和.超效缓凝砂浆与缓黏结预应力混凝土构件试验研究[J].土木工程学报,2003,36(8):57-62.
[13]尚仁杰,张强,周建锋,等.缓黏结预应力混凝土梁受弯试验研究[J].工业建筑,2008,38(11):24-27.
[14]张建玲,宋玉普,王志刚.缓黏结预应力筋的试验研究[J].施工技术,2007,36(3):21-23.
[15]王占飞,胡正伟,曹少朋,等.固化期间缓黏结预应力梁力学性能试验[J].中国公路学报,2017,30(1):56-62.
[16]中华人民共和国交通运输部.公路钢筋混凝土及预应力混凝土桥涵设计规范:JTG D62—2012[S].北京:人民交通出版社,2012.