选取直径为20 mm 和25 mm 直螺纹套筒钢筋各15对，分三组研究有效连接长度对套筒钢筋力学特性的影响，实验结果表明，技术规程中关于外露螺纹不宜超过2p 的规定是非常必要的，因此，工程现场进行质量监督与监控至关重要。%15 pairs are chosen for socket rebars with 20 mm and 25 mm diameters respectively,which are divided into 3 groups so as to study the effects of connection length on the strength. Results show that the requirement of 2p given in the code is necessary. Therefore,on site quality supervision is very important.
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