摘要
为解决工程实践中当混凝土结构内钢筋用量较大时钢筋间距过小的问题 ,提出了将纵向受力钢筋并筋布置的方法 .根据 3 1个并筋粘结锚固拉拔试件验的结果 ,进行了 1 7根钢筋混凝土并筋梁的受力性能试验 ,较详细地讨论了并筋梁粘结锚固的特点以及影响并筋粘结锚固的主要因素 ,并与一般梁进行了对比 .试验研究结果表明 ,采用并筋后钢筋和混凝土之间的粘结锚固性能有所下降 ,但粘结滑移特性与一般梁相近 ,通过适当延长锚固长度即可保证并筋梁的锚固强度和承载力 ,从而使并筋梁可在工程实践中应用 .给出了并筋锚固长度计算的建议公式 ,计算结果与试验结果符合良好 .在可靠度分析的基础上提出了并筋梁的设计建议 ,可供我国混凝土结构设计规范修订时参考 .
The first part of this paper describes the results of pull-out tests on 31 pieces of concrete specimens with bundled steel bars embedded. Based on the initial pull-out test results, a series of R.C. beam specimens that had been reinforced with bundled longitudinal steel bars were prepared and tested. The bond-anchorage characteristics and the major factors affecting the bond-anchorage properties of bundled steel bars in a R.C. beam, with comparisons to beams reinforced in the regular way, are discussed in detail. Formulas for calculating the required anchorage length of bundled steel bars are proposed. Calculated results from the proposed formulas agree well with the test results, and the design method of using bundled steel bars in beams is proposed. This proposal can be used as a reference for future revision of the Chinese Design Code.
出处
《郑州工业大学学报》
2001年第3期1-5,共5页
Journal of Zhengzhou University of Technology
基金
SupportedbytheNationalNaturalScienceFoundationofChina(5 93 783 61 )
