Castellated beam is a kind of holed web plate structural beam, since it has many advantages: savings in steel, light self-weight, resists bending and easy to deploy, the application of this structural beam becomes more and more widely. Due to its weakened web plate, castellated beam would be affected by shear effects greatly. The deformation of components increased under the affects of external loads. Therefore, in order to improve the accuracy of finite element analysis model, by consideration of the shearing effects and the bending stiffness affected under opened structure, this issue made improvement based on the theory of curved beams. By compare the results from this issue and the result from the analytical model of shell elements; we verify the feasibility of this method.
In this paper, 6 eccentric structural models are selected as examples, a great many elastic earthquake response analyses are carried out. The biggest action effect which an earthquake brings about when acting in one direction along certain angle is found out, and is defined as a normal value. Simultaneously, the present two commonly used methods using bidirectional horizontal earthquake input, with identical horizontal component earthquake waves, are used to calculate effect value. The results are compared, and they indicate that it's suitable for the proportion of the two component earthquake acceleration peak values to be adjusted to 1:0.3,when carrying out the bidirectional horizontal earthquake input with the same earthquake wave.
Light wood-frame structure, as not only has good seismic performance, but also can give full play to its ligneous advantages such as light mass, high tenacity, energy saving and environment protection, is widely applied to low-rise buildings and villas. The rigidity and ductility of shear wall structured by wood-frame are closely related to its sheathing material and the nail layout. In order to give full play to the carrying capacity of the nailed connection nodes, the article adopts the finite element model to compare the stress distributions of sheathings with different nail spacing, and the carrying capacity of the connection at the point of the sheathing is destructed, and also to provide the reasonable value of nail layout and a reference for the actual structural design.
A more accurate simulation of the response to the structure under seismic load action can be generated through taking bi-directional seismic motion input into consideration. The commonly used four calculation methods of bi-directional input are adopted in this paper to compare the different dynamic responses of mega steel-frame structure to seismic load action. The paper also provides a method for choosing Raleigh damping coefficients applicable to the dynamic analysis of mega steel-frame structure.
Beam-column connections of high-rise steel frames are usually welded, studies on seismic damages for nodes show that the existence of welding seam is the main reason which contributes to the brittle failure of nodes. This paper studies on the coming into being process of nodes, the deformation ability can be improved through changing welding order to reduce residual stresses for nodes. In the paper, numerical stimulations for nodes are conducted through finite element software. Distribution and peak value of residual stresses of beam-column connections are compared in accordance with different welding order. The analysis provides a theoretical basis for connection nodes in terms of utilizing their strength and ductility of steel.
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