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.

为了设计预应力的混凝土箱式围墙，有必要减轻梁网，因为严重的限制通过梁的重量设置为跨度。本文提出了一个新的结构系统，作为由拖曳元件组成的轻质网络。一个是一个框架结构，可以抵抗弯矩和轴向力。另一个是一个稀薄的网络，由二维碳纤维连续增强（CFRP网格）加强，它可以抵抗弯矩光束的剪切力，并为平板打孔。上述杂交结构系统。（1）使用混合结构系统对PC盒围栏部分进行数值分析。从结果可以看出，比较传统的网络部分可以减轻Web的重量。（2）进行了加载测试以评估CFRP网格的效果以及梁和板的最终强度用CFRP网格加固。从测试结果可以总结如下；（1）混凝土梁的裂纹宽度和分布取决于CFRP网格的网格。（2）混凝土束的终极剪切强度和混凝土板的弯曲强度，这些板被加固，这些强度被加固。 CFRPGrids，可以通过当前设计标准的代码方程进行评估。（3）用于用CFRP网格加固的混凝土板的剪切，当前的设计方程可能会高估了直觉的最终强度。因此，可以通过使用Young模量比修改的方程式来评估其打孔剪切强度。