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| Computation model of the steel frames with joint damages |
| Received:April 23, 2007 |
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| DOI：10.7511/jslx20095016 |
| KeyWord:fracture mechanics rotational stiffness stiffness matrix load bearing capacity |
| Author | Institution |
| 罗永峰 |
同济大学 土木工程学院,上海 |
| 宋怀金 |
同济大学 土木工程学院,上海 |
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| Abstract: |
| Steel frame structure will be in nonlinear state under strong earthquake with its mechanic properties of stiffness and strength degraded. This degradation has significant effect on seismic performance of structure later on. Based on the fracture mechanics, the behavior of the bolt-seam joints with cracks in welding seams of the steel frames are analyzed in this paper. The effective length and effective depth of a crack are derived. The relationship between bending moment (M) and rotation (θ) of the damaged rigid connection is obtained. The stiffness matrix of a beam with damaged joints is also derived. Numerical analysis is also conducted to ascertain the effects of joint stiffness on the internal forces of damaged steel frames. The results show that the joint damage has significant effects on the internal forces of the frames. Therefore, joint damage must be taken into account to ascertain the load bearing capacity of steel frames. |
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