系杆拱桥拱肋截面荷载试验的纵向车距限值研究

摘要

Bridge loading test is the most reliable method of determining its bearing capacity. It is Necessary to impose restrictions on the operate miss, in order to make the whole process of loading test more economic, safer and more reliable, and it is more difficult to control the test vehicle arrangement. This thesis takes a tied arch bridge arch-sectional loading test as a case, simulates different load efficiency and using MIDAS software when longitudinal wheelbase changes. The study shows when the longitudinal wheelbase is 2.8-5.0m, the loading efficiencies meet the design requirements. That is to say the layout error of the vehicle distance should not exceed 1.0m during actual operations.%桥梁荷载试验是确定桥梁承载能力的最可靠手段，为了使整个荷载试验过程能够更经济、安全、可靠，必须对现场实际操作误差进行一定的限制，而试验车布置时的纵向轮轴距比较难把握。本文以某系杆拱桥跨中拱肋截面荷载试验为例，在常规设计的基础上，采用MIDAS计算软件模拟计算在不同纵向车轮轴距时的荷载效率的变化情况，从而得到纵向车轮轴距一般在2.8m-5.0m才能保证荷载效率满足设计要求，也就是说实际操作时，车距布置误差不超过1.0m为宜。