马普托大桥悬索桥荷载试验与评价

Load test and assessment on suspension bridge of maputo bridge

马普托大桥主桥跨越莫桑比克马普托湾,是完全采用中国标准与规范完成设计、施工以及竣工验收的悬索桥。为考虑悬索桥强烈的几何非线性,采用软件BNLAS建立有限元模型,分析汽车活载作用下的结构内力、变形及自振特性,按照结构最不利受力和代表性原则确定控制截面,按照计算振型特征确定自振特性测点布置。文章荷载试验包括自振特性试验、动力响应试验,测试了桥梁的校验系数、自振特性和冲击系数,为全面评价马普托大桥主桥的正常使用状态和承载能力提供了依据。

The main bridge of Maputo Bridge spans Maputo Bay in Mozambique. It is a suspension bridge designed, constructed and completed in accordance with Chinese standards. In order to consider the strong geometric non-linearity of suspension bridge, the software BNLAS was used to establish a finite element model to analyze the internal force, deformation and natural vibration characteristics of the structure under vehicle live load. The control section was determined according to the principle of the most adverse force and representativity of the structure, and the measurement points of natural vibration characteristics were determined according to the characteristics of the calculated vibration mode. This load test includes natural vibration characteristic test and dynamic response test, and tests the check coefficient, natural vibration characteristic and impact coefficient of the bridge, which provides a basis for comprehensive evaluation of the normal service state and bearing capacity of the main bridge of Maputo Bridge.