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环形钢筋混凝土电杆已广泛地应用在我国的送电、配电线路上。30多年来,在电杆抗弯、偏压、压弯、抗扭和整基水泥杆已做过不少的试验研究工作。但电杆在多层堆放和起吊过程中,有如管形构件,承受横向静(动)荷载的挤压,致使电杆内、外壁产生微裂或纵向裂缝,此种带伤电杆投入运行后,由于干缩等外界条件影响,裂缝逐年变宽,模拟干缩试验已予证实。而设计者对此荷载从不进行计算,亦无完整的计算方法。并且认方电杆螺旋筋对抗弯、抗扭不起作用而予以减少,乃至不布置螺旋筋。事实上此种钢筋对付横向荷载挤压、
Circular reinforced concrete poles have been widely used in power transmission and distribution lines in China. For more than 30 years, many experimental researches have been done on the resistance to bending, biasing, bending, torsion, and cementing of poles. However, in the multi-layer stacking and lifting process, the poles are like tubular members and are subjected to lateral static (dynamic) load compression, resulting in micro cracks or longitudinal cracks in the inner and outer walls of the poles. Due to shrinkage and other external conditions, the cracks have gradually widened year by year, and simulation drying shrinkage tests have been confirmed. The designer never calculates the load and there is no complete calculation method. And recognizing that the spiral rods of the electric poles do not play a role in resisting bending and torsion, and even reduce the spiral ribs. In fact, this type of steel bar handles lateral load compression,