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首页> 外文会议>第一届现代铁路创新与可持续发展国际会议（The First International Symposium on Innovation amp; Sustainability of Modern Railway） >EXPERIMENTAL STUDY OF RC CONTINUOUS BEAMS STRENGTHENED BY EXTERNAL PRESTRESSING
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EXPERIMENTAL STUDY OF RC CONTINUOUS BEAMS STRENGTHENED BY EXTERNAL PRESTRESSING

机译：外部预应力加固钢筋混凝土连续梁的试验研究

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摘要

Two identical reinforced concrete beams which are 150 mm × 300 mm in cross section and continuous over two 3.0 m spans, are first subjected to a large load range to simulate actual conditions of concrete flexural members that require rehabilitation. Then, they are externally prestressed with either a draped or a straight tendon profile and subjected to monotonically increasing load to failure. The test indicates that external prestressing is a powerful technique for strengthening or rehabilitation of reinforcing concrete continuous flexural members. The increase of the nominal flexural resistance for center support region and midspan region is between 33 and 145 percent for the test specimens. External prestressing is also effective to control cracking and re-establish the service load deflections of the continuous flexural members. For the types of the external tendon profiles and for the levels of external prestressing force used in this investigation, external prestressing is shown to reduce the width of the existing cracks, and evidently reduce the deflection which is induced previously. Because of the progressive reduction of the depth of the straight external tendons with increasing member deformation to failure, external prestressing using a straight horizontal profile is less effective in increasing the flexural resistance as compared with a deviated profile. Furthermore, the straight horizontal profile adopted in this investigation does not decrease but increase the compressive stress in reinforcing steel at bottom face of the center support region. If this increment of compressive stress in reinforcing steel is not carefully controlled, it is unfavorable for the long-term behavior of the members.
机译：两条横截面积为150 mm×300 mm且在两个3.0 m跨度内连续的相同的钢筋混凝土梁首先要承受较大的载荷范围，以模拟需要修复的混凝土抗弯构件的实际状况。然后，在外部对它们施加预应力，使其具有悬垂或直的肌腱轮廓，并承受单调增加的破坏载荷。该测试表明，外部预应力是一种用于增强或修复钢筋混凝土连续挠性构件的强大技术。对于试样，中心支撑区域和中跨区域的名义抗弯强度的增加在33％至145％之间。外部预应力还可以有效地控制裂纹并重新建立连续挠曲构件的工作载荷挠度。对于本研究中使用的外部腱轮廓类型和外部预应力水平，已显示外部预应力可减小现有裂缝的宽度，并明显减少先前引起的挠曲。由于随着构件变形至破坏的增加，笔直的外部筋的深度逐渐减小，因此与偏斜的轮廓相比，使用笔直的水平轮廓的外部预应力在增加抗弯强度方面效果不佳。此外，在该研究中采用的笔直的水平轮廓不会减小而是增加了在中心支撑区域的底面处的钢筋中的压缩应力。如果不仔细控制钢筋中的压缩应力增量，则不利于构件的长期性能。

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