Use Of Girders Research Articles

Material Consumption Reduction by Using Steel Girders with Corrugated Webs

In this paper we present a comparative analysis regarding the shear web resistance between five types of steel plate girders and a girder with corrugated webs.In the case of girders with corrugated webs, the design is conducted according to SR EN 1993-1-5:2008.The use of girders with corrugated webs is at its beginnings in Romania, due to the manufacturing technology that require automation, therefore the design is as well new to most of the engineers. Through the paper, we want to underline the improved behavior that girders with corrugated webs have upon their competitors, steel plate girders, and to give an example for the design of such girders.

Moment-Rotation Response of Slender Steel I-Girders

While it is well known that slender girders have less ductility than their compact counterparts, this reduction has not been explicitly quantified. This results in limitations on the use of slender girders, and consequently, potential reductions in economy. These limitations are particularly significant in the AASHTO moment redistribution procedures, which exclude the use of girders that fail to satisfy certain compactness requirements. Thus, this paper reports the results of finite-element analysis (FEA) that has been validated by experimental testing of a series of I-girders with plate width-to-thickness ratios and unbraced lengths exceeding the limits for use of these provisions. From the FEA results and the complementary experimental results, the ductility of this class of girders is quantified in terms of moment-rotation response. Furthermore, a moment-rotation model that may be used to represent the ductility of any I-girder that satisfies AASHTO’s criteria for general I-girders is proposed.

Study of closed orbit response to magnet vibrations at the SSRF storage ring**Supported by SSRF Project

This paper presents the analytical and simulation responses of the closed orbit distortion in the SSRF storage ring to random and plane wave like magnet vibrations respectively. It is shown that the use of girder is very beneficial in the view of suppressing this response function. Effect of the independently supported gradient bending magnets to the closed orbit response is given. An analytic formula is written to give a rough estimate of the closed orbit distortion due to ground motion, taking into account the closed orbit response function and girder transfer function. As an example, the result of SSRF case is given.