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介绍了折线螺旋束型布筋的预应力混凝土框架边主梁及普通钢筋混凝土框架边主梁的对比荷载试验。试验数据分析表明,折线螺旋束型的预应力筋可以有效地提高边主梁的开裂扭矩,在出现斜裂缝后预应力抗扭筋仍然可以有效地工作。给出了折线螺旋束型布筋的预应力梁的抗扭极限承载力的计算公式,并通过工程实例,提出一种在框架边主梁中设置折线螺旋束型的预应力筋以承受次梁传来的协调扭矩的设计方法。
The contrastive load tests of prestressed concrete frame side girders and ordinary reinforced concrete frame side girders with crease spiral tendons are introduced. Experimental data analysis shows that the prestressing tendons with polygonal spiral beam can effectively improve the cracking moment of the side girders, and the prestressing torsion bars can still work effectively after the occurrence of diagonal cracks. The formula to calculate the ultimate torsional load capacity of the prestressed beam with crease spiral beam reinforcement is given. Through the engineering examples, a prestressing tendon with polygonal spiral beam is set in the frame side main beam to support the secondary beam The coordination of the design method of torque.