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轧制工形钢翼缘焊上盖板,并用摩擦型高强度螺栓栓接盖板的自由端(端部未焊接部分),使盖板端头的疲劳强度由E级提高到B级。端部螺栓的数量,必需能承受盖板范围内的弯矩。对盖板端部用高强度螺栓栓接而承受HS-20汽车荷载的二跨连续梁设计,参量分析表明,其疲劳强度不控制设计。盖板由疲劳强度为E级的长度缩短到理论切割点间长度,所节省的钢料费大于端部栓接所增加的费用。这一构造方式有抗疲劳的潜力,且造价低廉。它能利用现有工艺,因而可以立即实现。22片梁的试验表明,焊接盖板自由端经栓接后,疲劳寿命提高了三级,即从E级到B级。盖板端部栓接的桥梁主梁,通常盖板终止于理论切割点。这样制造的主梁是耐疲劳的,并较之习用的盖板端部焊接的主梁造价要便宜些。
Rolling steel flange flange welding the upper plate, and friction with high strength bolts bolt cover the free end (unwelded part), so that the fatigue strength of the end cap from E to B level. The number of end bolts must be able to withstand the bending moment in the area of the cover. The design of two-span continuous girder subjected to HS-20 automobile load by bolting the cover end with high-strength bolts shows that the fatigue strength does not control the design. The cover plate is shortened from the fatigue strength of grade E to the theoretical length of the cutting point, and the saving in the cost of steel is greater than the cost of the end bolting. This construction method has the potential of anti-fatigue, and low cost. It can take advantage of existing processes and can be done immediately. Twenty-two beam tests show that the free end of the welded plate after the bolt, the fatigue life increased by three levels, that is, from E to B level. The bridge girder, which is bolted to the end of the cover, usually terminates at the theoretical cutting point. The girders thus manufactured are fatigue-resistant and cheaper to manufacture than the girders used to weld the ends of conventional covers.