摘要
基于有限模型梁的静、动力交替试验研究,分析了钢筋混凝土梁的基频、静刚度、动刚度在“正常使用”阶段的变化规律,建立静、动刚度比与结构内力、自振基频的回归关系式,在对混凝土梁进行非线性分析的基础上,建立了结构裂缝统计参数与结构特征参数之间的回归关系。基于模型桥的静、动力交替试验研究,分析了多梁式T型结构在“正常使用”阶段的变形、应力、内力、频率的变化规律和裂缝开展过程及其统计参数。提出易被工程技术人员所接受的多梁式结构预测评估的动力分解法——根据外观裂缝检查成果和动力试验参数将桥跨结构分解为单片梁,获得各梁目前状态下的动刚度及静刚度,并得到模型试验成果的验证。
The static and dynamic behaviors of reinforced concrete T-type beams are studied by both theoretical and experimental means. Using nonlinear finite element analysis results, we have established the relationships between the ratio of static stiffness to dynamic stiffness of a beam and the applied bending moment, the ratio and resonance frequency, crack characteristic factor and sectional characteristic factor based on the variations of the resonance frequency, and the changes in static and dynamic stiffness during the cracking stage of the beam. The static and dynamic behaviors of a reinforced concrete model bridge with five T-type beams are also studied. The variations of the stress-strain, internal force, resonance frequency,mprehensively. In the decomposition-combination method, as v cracking process and crack characteristic factor are analyzed coerified by model tests, the bridge is divided into single T-type beams by using the ratio of dynamic stiffness of individual beams as evaluated by the crack characteristic factor and the resonance frequency. From the vibration tests, the actual stiffness of each beam of the bridge is obtained.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第8期91-95,共5页
China Civil Engineering Journal
关键词
钢筋混凝土梁式桥
裂缝
刚度
基频
动力分解法
reinforced concrete beam bridge
crack
stiffness
resonance frequency
dynamic decompositioncombination method
