前言模型试验可用来检验实桥的性态,当研究一种专门现象,如桥梁的稳定和失稳,静、动荷载作用下的安全和破坏等问题时,可以将某一类矛盾集中地突出出来,用模型试验的测试成果去推测实桥的性态不失为一种有效途径。因此,模型和原型的模拟关系也应该根据任务的不同而加以具体分析。当研究在伸臂安装条件下,桥梁模型的静载应力、挠度、杆件和结构的整体稳定时, The model test can be used to test the behavior of a real bridge. When studying a special phenomenon, such as the stability and instability of a bridge, the safety and damage under static and dynamic loads, it is possible to highlight a certain type of contradiction Come out, with the model test results to speculate that the nature of the bridge can be an effective way. Therefore, the simulation relationship between model and prototype should also be analyzed according to different tasks. When studying the static load stress and deflection of the bridge model and the overall stability of the bar and structure under the arm mounting conditions,