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（長(zhǎng)安大學(xué)建筑工程學(xué)院  西安 710061）

［提要］  應(yīng)用有限元分析軟件ANSYS對(duì)一種新型的芯鋼管連接的半連通鋼管混凝土柱和鋼筋混凝土梁角節(jié)點(diǎn)進(jìn)行非線性分析。確定單元類型、材料本構(gòu)關(guān)系、破壞準(zhǔn)則和梁端荷載，利用對(duì)稱性建立的三維實(shí)體模型分析模型中梁、柱、外鋼管、節(jié)點(diǎn)芯鋼管、環(huán)箍、豎向鋼筋和混凝土的應(yīng)力狀況。研究模型破壞過(guò)程、受力性能、破壞機(jī)理以及模型破壞的原因，并將有限元分析結(jié)果與模型試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析，互相驗(yàn)證了分析結(jié)果的正確性。證實(shí)這種新型節(jié)點(diǎn)的合理性、可行性，指出節(jié)點(diǎn)還有較大的承載潛力，滿足“強(qiáng)柱、弱梁、節(jié)點(diǎn)更強(qiáng)”的抗震設(shè)計(jì)原則,用于實(shí)際工程有望解決節(jié)點(diǎn)傳遞彎矩能力弱、剛度差、構(gòu)造復(fù)雜、施工不便等問(wèn)題。

［關(guān)鍵詞］  鋼管混凝土  節(jié)點(diǎn)  芯鋼管  破壞機(jī)理  有限元方法  非線性分析

Nonlinear Finite Element Analysis of Semi-connected Corner Joint with Core Steel Tube in Concrete Filled Steel Tube/Lu Xianjun,Wang Yihong,Fu Min,Guo Zenghui(School of Civil Eng., Chang′an University, Xi′an 710061, China)

Abstract:The new joint connects concrete filled steel tubular (CFST) column and RC beam. The element types, the material constitutional relationship and the failure criterion are confirmed, and the load at beam end is simplified. Based on the symmetrical character, the three dimensional model is presented to analyze the stress status of the members in the joint model, including the beam, the column, the outer steel tube, the joint core steel tube, the hooping, the vertical reinforcement and the concrete. The forced behavior, the failure mechanism and the cause of the model failure are studied. The results of the model test are compared with the results of the finite element analysis. By the comparative results, the correctness of the analysis results is validated, and the rationality and feasibility of the new type joint are approved. The results also indicates that the joint still has potential bearing capacity. The joint model meets the seismic design principles “strong column, weak beam, stronger joint”. In the actual projects, it will solve lots of the problems, such as the weak capability of the joint in passing the moment, the weak stiffness, the complex conformation and the inconvenience construction.

Keywords:concrete filled steel tube; joint; core steel tube; failure mechanism; finiteelement method; nonlinear analysis

*陜西省自然科學(xué)基金資助項(xiàng)目(2001C07)。