先张法CFRP筋预应力海水海砂混凝土板传递长度分析

Analysis of transfer length of pre-tensioned prestressed CFRP bars and sea water sea-sand concrete slab

为了研究先张法CFRP筋预应力海水海砂混凝土板的预应力传递长度,首先进行了CFRP筋与海水海砂混凝土黏结性能的实验,通过理论分析以及有限元数值模拟,得到了影响CFRP筋与海水海砂混凝土黏结性能的主要因素及其影响机理。采用ABAQUS软件建立了先张法CFRP筋-海水海砂混凝土预应力板有限元模型,对先张法CFRP筋预应力海水海砂混凝土的传递长度进行了分析。参数分析结果表明,混凝土强度越高,预应构件的传递长度越短,这是因为黏结强度的增大使得预应力的传递距离变短;而CFRP筋与张拉控制应力的增大,都能显著增大传递长度。本文还提出了基于混凝土黏结强度下的先张法CFRP筋-海水海砂混凝土预应力构件传递长度的计算公式。

In order to study the prestress transfer length of pretensioned CFRP tendons, the bond performance of CFRP bars and sea water sea-sand concrete is tested. According to the theoretical analysis and finite element numerical simulation, several factors affecting the bond performance of CFRP bars and sea water sea-sand concrete are analyzed. The finite element model of pre-tensioned prestressed CFRP bars and sea water sea-sand concrete slab is established by ABAQUS software, and the transfer length of pre-tension prestressed CFRP bars and sea water sea-sand concrete slab is analyzed. The results show that the higher the concrete strength is, the shorter the transfer length of the prestressed member is, because the increase of the bond strength makes the transfer distance of the prestressed shorter. The transfer length can be significantly increased with the increase of CFRP reinforcement and tension control stress. This paper also puts forward the calculation formula of the transfer length CFRP bars sea water sea-sand concrete prestressed members.