论文部分内容阅读
通过对足尺胶合竹梁桥试验模型3年半时间的蠕变观测,得到了10m跨胶合竹CFRP加强桥梁在均布荷载作用下的跨中挠度的长期量测数据,并进行了相关分析。试验结果显示,竹桥3年半的蠕变变形约为7.98mm,且高温和潮湿气候会增加其蠕变速率。对经过3年多蠕变的桥梁进行了静力加载短期破坏试验,在185 kN的均布荷载下,桥梁发生了整体垮塌。试验结果和相关分析表明,CFRP能提高竹梁受力性能,大跨度CFRP加强竹梁能充分满足实际工程中强度和耐久性的需求,但是经过长期受荷之后的竹梁强度和刚度均存在一定程度的下降。研究结果为竹结构桥梁的设计提供了依据,对竹结构桥梁的构造措施也提出了相应的设计建议。
The long-term measurement data of the mid-span deflection of CFRP-strengthened bridge with 10m cross-over bamboo under a uniform load was obtained by creep observation of the full-length glued bamboo bridge experimental model for three and a half years, and the correlation analysis was carried out. The test results show that bamboo bridge creep deformation in about three and a half years is about 7.98mm, and high temperature and humid climate will increase its creep rate. After more than three years of creep, the bridge was subjected to a short-term failure test of static loading. Under a uniform load of 185 kN, the whole bridge collapsed. The test results and correlation analysis show that CFRP can improve the bearing capacity of bamboo beam. The long-span CFRP strengthened bamboo beam can fully meet the requirements of strength and durability in practical engineering, but after long-term load, the strength and stiffness of bamboo are both decline. The research results provide the basis for the design of bamboo structural bridges and the corresponding design proposals for the structural measures of bamboo structural bridges.