新型装配式不对称混合连接节点试验研究

Experimental Study on New Prefabricated Unsymmetrical Hybrid Subassemblages

不对称混合连接是预制装配式混凝土结构的一种新型连接方式。预制梁和柱通过无黏结后张预应力筋装配形成整体,作为耗能元件的普通钢筋仅设置在梁截面上部,并在梁柱连接处作部分无黏结处理。介绍三榀不对称混合连接边节点的低周反复加载试验,试验结果显示:试件的破坏都集中在梁柱接触面,梁柱构件本身及节点核心区破坏轻微;试件的滞回曲线均呈现"S"形,曲线明显呈不对称形状,正向加载时曲线更为饱满;试件的位移延性系数在3.75～5.0,最终等效黏滞阻尼系数为8%～10%。

Unsymmetrical hybrid connection is a new type of connection of precast prefabricated concrete structure. The precast beams and columns are connected by unbonded post-tensioned prestressed tendons. The unsymmetrical mild steel bars as energy-dissipation component are only placed on the upside of the beam section,and are set partly unbonded near the interface. The experiments for three exterior subassemblages under low reversed cyclic loading are introduced. The experiment results show that damages concentrate near the beam-column interface,while the beam and column remain elastic with few cracks,and that all the cyclic curves show the shape of ＂S＂and are unsymmetrical and more plumper under positive loading,and that the displacement ductility coefficients are between 3. 75 ～ 5. 0, and the equivalent viscous damping coefficient is about 8% ～ 10% .