温度变化对固定式钢拱桥动力性能的影响

INFLUENCE OF TEMPERATURE VARIATION ON FIXED STEEL ARCH BRIDGE DYNAMIC PERFORMANCE

在结构设计和监测中,很少考虑温度变化的影响。然而,在某些情况下,温度可能是影响荷载桥梁动力性能的重要因素,特别是对于大跨度桥梁,温度升高可能导致温度效应增加,造成结构动力学参数发生改变,这些参数与物理参数直接相关,如质量和刚度。因此,当物理参数发生变化时,动力参数也会相应地发生变化,这种变化可能会改变结构的健康指数。在某些规定中,作为动力特性之一的固有频率值的偏差被限制在10%以内。本研究的目的是观察确定案例研究桥梁的健康指数,观察温度变化影响的动力学性能。

The influence of temperature variation is rarely considered in structure design and monitoring.However,under some conditions,temperature may be an important factor influencing loaded bridge dynamic performance,especially for wide-span bridge.Temperature increase may cause the increase of temperature effect,which may change the dynamic parameters of structure,and these parameters are directly related to the physical parameters,such as quality and rigidity.Therefore,physical parameter change may cause related change of dynamic parameters.This change may also change the healthy index of structure.In some specifications,fixed frequency deviation which is one of the dynamic characteristics is limited to be within 10%.This paper aims to observe and determine the healthy index of bridge through case study and to observe the dynamic performance under the influence of temperature change.