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LIGHT-WEIGHT PRECAST PC BOX GIRDER BRIDGE USING CFRP CONTINUOUS GRIDS

使用 CFRP 连续网格的轻型预制 PC 箱梁桥

基本信息

批准号：
07555146
负责人：
HINO Shinichi
金额：
$ 12.74万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

For the design of prestressed concrete box girder briges, it is necessary to lighten the girder webs since severe limit is set to the span length by the weight of girder. A new structural systems is proposed herein as the light weight web which consists of tow element. One is a framed structure which can resist the bending moment and axial force. And the other is a thin web reinforced by the two-dimensional carbon fiber continuous reinforcement (CFRP grids) which can resist the shear force for beams of bending moment and punching shear for slabs.This study aims at providing some fundamental informations on deveropment of the above mentioned hybrid structual system.(1) Numerical analysis of PC box girder section by using hybrid structural system was carried out. From the result, it can be seen that the weight of web can be reduced by 50% comparing the traditional type of web section.(2) A loading test was carried out to evaluate the effect of CFRP grids and ultimate strength of beams and slabs reinforced with CFRP grids. From test results, it can be summarized as follows ;(1)The crack width and distribution of concrete beams depend on the mesh of CFRP grids.(2) Ultimate shear strength of concrete beam and bending strength of concrete slab, which are reinforced with CFRPgrids, can be evaluated by the code equations of current design standards.(3) For punching shear of concrete slabs reinforced with CFRP grids, the current design equations may be overestimate the actural ultimate strength. So, it can be evaluated their punching shear strength by using the equations modified with the ratio of Young's modulus.

在预应力混凝土箱梁桥设计中，由于梁重对跨度的限制很大，必须对梁腹进行轻量化。本文提出了一种新的结构体系，即由丝束单元组成的轻质腹板。一种是框架结构，它可以抵抗弯矩和轴力。另一种是由二维碳纤维连续筋（CFRP网格）加固的薄腹板，它可以抵抗梁的弯矩剪力和板的冲切剪力，本文的研究旨在为上述混合结构体系的发展提供一些基础信息。(1)对采用混合结构体系的预应力混凝土箱梁截面进行了数值分析。从计算结果可以看出，与传统的腹板截面形式相比，该腹板的重量可以减轻50%。(2)通过加载试验，研究了碳纤维格栅的加固效果及碳纤维格栅加固梁板的极限承载力。试验结果表明：（1）混凝土梁的裂缝宽度和裂缝分布取决于碳纤维布网格的划分。(2)碳纤维格栅加固混凝土梁的抗剪承载力和混凝土板的抗弯承载力可按现行规范计算公式计算。(3)对于碳纤维格栅混凝土板的冲切承载力，现有的设计公式可能高估了板的实际极限承载力。因此，可以用经杨氏模量比修正后的公式来评价其冲切强度。