曲线坦拱桥的模型试验研究

Experimental Research on the Model for Curved Flat Arch Bridge

研究目的:常规拱桥的矢跨比均在1/5左右,大连市泉水4号桥则为1/12,并设有半径为500 m的平曲线,这种曲线坦拱桥较为少见。为确保该桥的结构设计安全,并论证工程中经常采用的平面有限元模型在该桥的适用性,本文设计制作了有机玻璃模型,对其空间力学特性进行了测试分析,同时建立空间有限元模型进行对比研究。研究结论:通过实测数据与理论分析结果的对比分析,得出对曲线拱桥要注意弯扭耦合效应的影响,在慎重考虑一些关键参数选取的条件下,可以采用平面有限元模型对大曲率半径的坦拱桥进行结构分析。

Research purposes： The rise - span ratio of general arch bridge is about 1/5, but Quanshui Bridge 4 is a seldom one with the rise - span ratio of 1/12 and plane curve radius of 500 m. For ensuring the structure design safety of the bridge and examining the feasibility of common - used plane finite element model for this bridge, this paper testifies and analyzes the spatial mechanics characteristics of the bridge with the organic glass model and compares them with the spatial finite element model. Research conclnsions：Based on analyzing the tested data and the result of theoretical analysis, it is concluded the attention should be paid to the effects of coupling bending - torsion on curved flat arch bridge and the flat arch bridge with larger curve radius can be analyzed by setting up plane finite element model as long as more attention is paid to the selection of some critical parameters.