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(1 北京工業(yè)大學建筑工程學院， 北京 100124; 2 北京工業(yè)大學北京市高層和大跨度預應力鋼結構工程技術研究中心， 北京 100124; 3 北京建筑大學北京未來城市設計高精尖創(chuàng)新中心， 北京 100044)

［摘要］基于控制損傷的思想，提出了一種帶狗骨削弱蓋板的自復位預應力鋼框架梁柱節(jié)點，其構造由帶懸臂梁段的圓鋼管柱、結構梁段、狗骨削弱蓋板、預應力拉索以及高強螺栓群組成，可實現現場快速裝配。通過控制狗骨削弱蓋板厚度以及預應力拉索初始預拉力大小等參數，研究節(jié)點的耗能性能以及震后修復情況，尋求合理的影響因素。對4個新型自復位預應力梁柱節(jié)點算例進行了數值模擬分析，獲得了節(jié)點的荷載-位移曲線、應力分布曲線以及預應力拉索索力變化曲線等數據，分析節(jié)點狗骨削弱蓋板厚度以及拉索初始預拉力大小對節(jié)點復位能力的影響規(guī)律。研究表明：在達到預期自復位效果的前提下，具有狗骨削弱蓋板的節(jié)點相比于無翼緣蓋板的節(jié)點具有更好的耗能能力，可有效降低結構的塑性損傷，確保梁柱等主體構件不發(fā)生破壞；同時，狗骨削弱蓋板厚度與拉索初始預拉力大小的不同組合關系，將會影響節(jié)點的復位模式。

［關鍵詞］可恢復功能結構； 預應力； 梁柱節(jié)點； 狗骨削弱蓋板； 數值模擬

中圖分類號：TU394， TU392文獻標識碼：A文章編號：1002-848X(2019)19-0119-07

Static performance of self-resetting prestressed beam-column joints with dog-bone weakened cover plate

Zhang Ailin1,2,3, Yang Zhongshuai1, Jiang Ziqin1,2, Zhao Di1, Zhou Baoru1

(1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; 2 Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structure, Beijing University of Technology, Beijing 100124, China; 3 Beijing Advanced Innovation Center for Future City Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China)

Abstract:Based on the idea of damage control, a self-resetting prestressed steel frame beam-column joint with dog-bone weakened cover plate was proposed and the structure of the joint consists of circular tubular steel column with cantilever beam, structural beam, the dog-bone weakened cover plate, prestressed cable and high-strength bolt groups, which can realize rapid assembly on site. By controlling the thickness of the dog-bone weakened cover plate, the size of the initial pretension of the prestressed cable and other parameters, the energy dissipation performance of the joint and the post-earthquake repair situation were studied, and reasonable influencing factors were researched. The numerical simulation analysis of four prestressed beam-column joints was carried out, and the load displacement curve, stress distribution curve and prestressed cable force change curve of the joints were obtained. The influence of the thickness of the dog-bone weakened cover plate and the initial pretension of the cable on the reset ability of the joints was analyzed. The research shows that under the premise of achieving the expected self-reduction effect, the joints with the dog-bone weakened cover plate have greater energy dissipation capacity than those without the cover plate, effectively reduce the plastic damage of the structure, and ensure that the main components such as beams and columns are not damaged; At the same time, the different combination relationship between the thickness of the dog-bone weakened cover and the initial pretension of the cable will affect the reset mode of the joint.

Keywords:self-resetting structure; prestress; beam-column joint; dog-bone weakened cover plate; numerical simulation