权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Mechanical Behaviors of Super High Strength Partially Prestressed Concrete Having a Vertical Construction Joint

竖向施工缝超高强部分预应力混凝土的力学性能

基本信息

批准号：
09650502
负责人：
TSUJI Yukikazu
金额：
$ 2.05万
依托单位：
GUNMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650502/
关键词：
Partially Prestressed Concrete Construction Joint Super High Strength Concrete Flexural Behavior Shearing Behavior Prestressing Strengthening by Steel Plate Reinforced Concrete Beam 力学的性状

项目摘要

Reinforced concrete beams and partially prestressed concrete beams having a vertical construction joint were produced by using both ordinary strength concrete and super high strength concrete. The vertical construction joint was placed in a shear span of the beam. A flexural loading test was carried out to take cracking behaviors and stirrup's strains of the beam. Strengthening effect of placing steel plates and prestressing to the beam was also investigated. The test results are as follows.1) The reinforced concrete beam with ordinary strength concrete was cracked firstly in the vertical construction joint and the flexural crack was turned to a diagonal tension crack lastly the beam was failured by shearing compression failure mode.2) The degree of shearing strength reduction by the vertical construction joint is smaller in the case of the beam with super high strength concrete. However the strains of the stirrups in the beam were increased by the vertical construction joint.3) Increase of the strains of the stirrups was restrained by steel plate strengthening in the portion of the vertical construction joint.4) The strengthening effect of prestressing to the beam was also ascertained as the same degree of the steel plate strengthening.5) The defect of the vertical construction joint was clear even in the super high strength concrete beam if a good treatment was not performed at the construction joint.

采用普通强度混凝土和超高强混凝土两种材料制作了钢筋混凝土梁和带竖向施工缝的部分预应力混凝土梁。竖向施工缝设置在梁的剪力跨内。进行了受弯荷载试验，测定了试件的开裂性能和裂缝应变。同时还研究了在梁上放置钢板和施加预应力的加固效果。试验结果表明：1）普通混凝土梁在竖向施工缝处首先开裂，然后由弯曲裂缝转变为斜拉裂缝，最后以剪压破坏模式破坏; 2）超高强混凝土梁竖向施工缝对抗剪强度的降低程度较小。3）在竖向施工缝部位设置钢板加固，可以抑制箍筋应变的增加; 4）预应力对梁的加固效果与钢板加固效果相当即使是超高强混凝土梁，如果施工缝处理不好，竖向施工缝的缺陷也很明显。