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Structural Engineering Approach for Diagnosis of Damage in Masonry Heritages

砖石遗产损坏诊断的结构工程方法

基本信息

批准号：
06834005
负责人：
HIKOSAKA Hiroshi
金额：
$ 1.41万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06834005/
关键词：
Stone arch Fracture mechanics Damage mechanics Rigid body-spring model 複合材料

项目摘要

There are more than 1,000 stone arch bridges in Japan, particularly in Kyushu Island. Some of them were built i early Edo Period (about 300 years ago), and others are also of considerable age. Most of them are excellent reminders of the Japan's civil engineering heritage. It is important therefore not only to maintain these bridges in good condition but also, when necessary, to be able to estimate their load carrying capacity as accurate as possible.Computer modelling provides a great tool in understanding the real behavior of structures, either new or ancient. Nevertheless, in particular for problems concerning masonry structure like stone arch bridge, the use of numerical methods, including most finite element approaches, are often unapplicable because of the discontinuity of each masonry element. By modelling a masonry structure as an assemblage of rigid blocks interconnected by nonlinear springs, limit state analyzes are practicable, while reducing both computational effort and program complexity relative to finite element approaches.Simulating the static response of an existing multi-span stone arch bridge which was built about 150 years ago, the numerical results show displacements and rotations in stone vousoirs which correlate well with the test results under truck loads. Some of the driving code parameters which still need further investigation are normal and shear spring stiffnesses considering the rough contact between actual voussoirs.

日本有1,000多座石拱桥，特别是在九州岛。其中一些建于江户时代早期（约300年前），其他人也相当古老。它们中的大多数都是日本土木工程遗产的绝佳提醒。因此，重要的是不仅要保持这些桥梁处于良好的状态，而且在必要时，能够尽可能准确地估计其承载能力。计算机建模为理解结构的真实的行为提供了一个很好的工具，无论是新的还是古老的。然而，特别是对于石拱桥这样的砌体结构问题，由于每个砌体单元的不连续性，使用数值方法，包括大多数有限元方法，往往是不适用的。通过将砌体结构建模为由非线性弹簧连接的刚性块体的组合，极限状态分析是可行的，同时相对于有限元方法减少了计算工作量和程序复杂性.模拟了大约150年前建造的现有多跨石拱桥的静态响应，数值计算结果显示了石墙中的位移和旋转，与卡车载荷下的测试结果有很好的相关性。一些驱动代码的参数，仍然需要进一步研究的正常和剪切弹簧刚度，考虑到实际砌体之间的粗糙接触。