大跨连续梁桥施工膺架的设计研究

Research on Design for Constructive Rack of Long-span Continuous Beam Bridge

以某大跨连续梁桥施工膺架为工程背景,先采用有限元软件对原图纸和荷载方案进行校核,发现其承载能力不足的缺点后,对施工膺架的碗扣支架、贝雷梁、横向支撑梁、钢管立柱进行了设计,并用有限元软件对设计后的施工膺架各个构件进行了强度和稳定性验算.结果表明:在保证造价经济的前提下,设计后的桥梁施工膺架在承载力方面得到很大提高,满足桥梁施工要求.

The original drawings and load plans of one constructive rack of long-span continuous beam bridge are checked by using FEA software. Shortage of carrying capacity of this constructive rack is found. So, optimization design for this constructive rack is suggested to redesign the bowl buckle stents, bailey beams, Lateral support beams and steel tube columns. Then, the FEA software is used to check the strength and stability of every members of constructive rack. The following conclusions are obtained： on the premise of economy build price, the carrying capacity of optimized constructive rack is increased to meet the demands of construction. The optimization and checking method proposed in this paper, can provide some meaningful reference for other similar projects.