基于原位试验的桥梁施工过程应力修正

Stress Modification of Bridge Construction Based on the In-situ Experiment of Bridge

针对混凝土桥梁施工过程结构真实应力识别需要,通过现场测试与原位试验,埋设无应力传感器试件,对弦振式传感器测量的混凝土应变增量中的温度与收缩徐变影响进行有效修正,研究有效扣除温度自由应变,混凝土收缩徐变的方法,找出应变增量与混凝土应力应变的关系,形成混凝土桥梁施工过程结构真实应力监测实用方法,指导弦振式传感器现场测量应力修正。

In view of the identification demand of structure real stress in the process of concrete bridge construction, nostress sensor components were embedded in the bridge through the field test and in-situ test. And the temperature and shrinkage creep effects in concrete strain increments measured by string vibration sensor were modified effectively. A method to take off the temperature free strain and shrinkage creep of concrete was researched. Finally, the relationship between strain increments and concrete stress-strain was found out to develop a practical method to monitor the real stress in construction process of concrete bridge and to guide the modification of the stress measured by string vibration sensor.