空间网状吊杆系杆拱桥吊杆断裂对结构的力学性能分析

Analysis of Mechanical Properties of the Structure Caused by the Fracture of the Suspension Rod of Spatial Mesh Suspension Rod Tied Arch Bridges

以某宽幅空间网状吊杆钢箱系杆拱桥为研究背景,分析空间网状吊杆系杆拱桥吊杆断裂后的稳定状态下对结构的力学性能影响。通过模拟吊杆断裂后的状态,分析同侧吊杆断裂的数量以及断裂位置对剩余吊杆内力、主梁内力、主拱内力、主梁线形、主拱线形的静力学特性。结果表明,吊杆断裂后,相邻吊杆会发生内力重分布的现象,距离断裂位置越近,受到的影响越大;吊杆断裂后,会在其断裂位置附近出现位移减少的峰值,距离断裂位置越远,对主梁和主拱的线形影响逐渐减小;通过分析单根吊杆断裂和2根吊杆断裂可知,吊杆断裂后对主梁和主拱影响最大的位置为拱脚位置和跨中位置。

Based on the research background of a steel box tied arch bridge with a wide spatial mesh boom,the effects of the broken boom on the mechanical properties of the structure were analyzed.By simulating the state of the broken boom,the static characteristics of the number and position of the broken boom on the internal force of the remaining boom,the internal force of the main beam,the internal force of the main arch,the line shape of the main beam and the line shape of the main arch were analyzed.The results show that the internal force redistribution of the adjacent boom will occur after the boom breaks,and the closer the distance to the fracture,the greater the impact.After the boom was broken,the peak of displacement reduction would appear near the fracture position,and the farther away from the fracture position,the influence on the linear shape of the main beam and main arch would gradually decrease.Through the analysis of single boom fracture and two booms fracture,it can be seen that the arch foot position and mid-span position have the greatest influence on the main beam and main arch after the boom fracture.