预制装配式混凝土斗栱节点抗震性能优化设计

Optimization Design of Seismic Performance of Prefabricated Concrete Bucket Arch Joints

斗栱以其独具特色的结构体系和丰富的历史文化内涵成为中国木结构建筑的典型构件,在现代仿古建筑中也不可缺少。试验采用实际工程中斗栱与混凝土柱的连接方式,开展低周往复加载试验来研究斗栱节点的抗震性能。为优化斗栱薄弱部位的受力性能,建立了预制装配式混凝土斗栱节点的有限元模型,开展了节点在低周往复荷载作用下的数值仿真模拟分析。根据斗栱坐斗的破坏形态,提出了钢纤维混凝土坐斗模型,并研究了坐斗掺入不同体积率的钢纤维时应力、应变的变化规律,评估了坐斗掺入不同体积率钢纤维的加固效果。

With its unique structural system and rich history and culture, Dougong has become a typical component of Chinese wood structure architecture, which is also indispensable in modern antique architecture. In this test, the low cycle cyclic loading test is carried out to study the seismic performance of the bucket arch joint. In order to optimize the mechanical properties of the weak parts of dougong, the finite element model of prefabricated concrete bucket arch joint is established, and the numerical simulation test analysis of the joint under low cycle reciprocating load is carried out. According to the failure mode of the bucket, the model of steel fiber reinforced concrete bucket is put forward, and the change rule of stress and strain when the bucket is mixed with steel fiber with different volume ratio is studied. The reinforcement effect of the bucket with different volume ratio steel fiber is evaluated.