L型塑料钢筋拉结件锚固性能试验

Experimental Study on Anchorage Performance of L-Shaped Plastics Steel Tie for Cavity Wall

目的为解决夹心墙用拉结件的耐腐蚀性问题，采用高强钢筋外包塑料形成塑料钢筋拉结件．方法通过L型塑料钢筋拉结件灰缝试件试验模拟Z型塑料钢筋拉结件在灰缝中的受拉状态，研究Z型塑料钢筋拉结件的黏结、锚固性能．结果L型塑料钢筋拉结件极限拉拔力每组平均值为3．33～4．4kN，极限拉拔力最小值为2．9kN，在遭受地震作用时，塑料钢筋拉结件所传递的最大地震力远小于其极限拉拔力最小值．结论L型塑料钢筋拉结件的粘结锚固强度可以满足夹心墙用拉结件的使用要求，有比普通钢筋拉结件更好的延性和变形能力，并给出Z型与卷边Z型塑料钢筋拉结件的合适构造参数．

In order to solve corrosion resistance problem of steel tie for cavity wall, plastics steel ties were made of high-tensile reinforcing steel and lagging plastic. A G steel tie lagging plastic would transfer its bond behavior and anchorage performance between steel tie and mortar and tensile status of Z-shaped plastics steel tie was simulated through an experiment of mortar joint sample of L-shaped plastics steel ties, we went into the bond behavior and anchorage performance between Z-shaped plastics steel tie and mortar. The average value of ultimate drawing force of each group L-shaped plastics steel ties was 3.33 -4. 4 kN. The minimum value of ultimate drawing force was 2. 9 kN. Maximum earthquake force transferred by plastics steel tie was far less than the minimum value of ultimate drawing force when suffering large earthquake. The results by exemplification show that mechanical behavior of L-shaped plastics steel tie can satisfy the use requirement for cavity wall. The tensile properties and deformation performance of plastics steel tie for cavity wall are more superior to that of general steel tie. At last, through analyses of bond behavior and anchorage performance influencing factor,we give Z-shaped and flanging Z-shaped plastics steel tie＇s proper structural parameter.