使用高級(jí)分析法的鋼框架創(chuàng)新設(shè)計(jì)浙江大學(xué)城市學(xué)院畢業(yè)設(shè)計(jì)外文翻譯-資料下載頁(yè)
2025-06-05 15:12本頁(yè)面
【正文】 aring case studies of actual members and frames with the results of analysis/design based on exact plasticzone solutions and LRFD designs. The wide range of case studies and parisons should confirm the validity 浙江大學(xué)城市學(xué)院畢業(yè)設(shè)計(jì) 外文翻譯 of this advanced method. 2． Practical Advanced Analysis This section presents a practical advanced analysis method for the direct design of steel frames by eliminating separate member capacity checks by the specification. The refined plastic hinge method was developed and refined by simply modifying the conventional elasticplastic hinge method to achieve both simplicity and a realistic representation of actual behavior [15, 25]. Verification of the method will be given in the next section to provide final confirmation of the validity of the method. Connection flexibility can be accounted for in advanced analysis. Conventional analysis and design of steel structures are usually carried out under the assumption that beamtocolumn connections are either fully rigid or ideally pinned. However, most connections in practice are semirigid and their behavior lies between these two extreme cases. In the AISCLRFD specification [2], two types of construction are designated: Type FR (fully restrained) construction and Type PR (partially restrained) construction. The LRFD specification permits the evaluation of the flexibility of connections by “rational means”. Connection behavior is represented by its momentrotation relationship. Extensive experimental work on connections has been performed, and a large body of momentrotation data collected. With this data base, researchers have developed several connection models, including linear, polynomial, Bspline, power, and exponential. Herein, the threeparameter power model proposed by Kishi and Chen [21] is adopted. Geometric imperfections should be modeled in frame members when using advanced analysis. Geometric imperfections result from unavoidable error during fabrication or erection. For structural members in building frames, the types of geometric imperfections are outofstraightness and 浙江大學(xué)城市學(xué)院畢業(yè)設(shè)計(jì) 外文翻譯 outofplumbness. Explicit modeling and equivalent notional loads have been used to account for geometric imperfections by previous researchers. In this section, a new method based on further reduction of the tangent stiffness of members is developed [15, 16]. This method provides a simple means to account for the effect of imperfection without inputting notional loads or explicit geometric imperfections. The practical advanced analysis method described in this section is limited to twodimensional braced, unbraced, and semirigid frames subject to static loads. The spatial behavior of frames is not considered, and lateral torsional buckling is assumed to be prevented by adequate lateral bracing. A pact W section is assumed so sections can develop full plastic moment capacity without local buckling. Both strong and weakaxis bending of wide flange sections have been studied using the practical advanced analysis method [15]. The method may be considered an interim analysis/design procedure between the conventional LRFD method widely used now and a more rigorous advanced analysis/design method such as the plasticzone method to be developed in the future for practical use.
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