- 摘 要
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(1 長沙理工大學土木工程學院， 長沙 410004； 2 中機國際工程設計研究院有限責任公司，長沙 410007； 3 湖南順天建設集團有限公司， 長沙 410008)
［摘要］弧形梁因造型優(yōu)美而廣泛應用于高層建筑結構。在豎向荷載作用下，弧形梁承受彎矩、剪力、扭矩等，受力情況復雜。以某混凝土弧形梁結構為研究對象，采用多種有限元軟件對其進行受力分析。采用SAP2000建立不同樓板約束條件下的弧形梁結構有限元模型，并對其在豎向荷載下的彎矩、扭矩等內(nèi)力分布規(guī)律進行研究?；贏BAQUS通用程序，建立可考慮材料非線性和損傷的結構三維精細有限元模型，研究有無樓板約束對弧形梁結構承載性能的影響。結果表明，該弧形梁結構設計安全余量較大；樓板對弧形梁的扭轉變形有明顯的約束作用，使該弧形梁的曲線和直線段部分正負扭矩較均衡；樓板約束作用能顯著增強弧形梁結構的承載能力。
［關鍵詞］混凝土弧形梁；受力性能；抗扭性能；樓板厚度
中圖分類號：TU398 文獻標識碼：A文章編號：1002-848X(2021)21-0054-05
Study on mechanical behavior of a concrete curved beam structure considering floor constraint
LIU Zhi1, JIANG Youbao1, TAN Guangyu2, CHEN Fanghong3, HU Zhihai2, XIAO Zhi2, JIANG Yu1, DENG Yunfeng1
(1 School of Civil Engineering, Changsha University of Science and Technology, Changsha 410004， China；2 Machinery International Engineering Design & Research Institute Co., Ltd., Changsha 410007， China；3 Hunan Skyer Construction Group Co., Ltd., Changsha 410008， China)
Abstract: Curved beam is widely used in high-rise building due to its beautiful shape. Under the vertical load, curved beam often bears bending moment, shearing force, torque and so on, and its force situation is complicated. Taking a concrete curved beam structure as an example, its mechanical analysis was carried out by using a variety of finite element software. SAP2000 was used to build the finite element model of the curved beam structure with different floor constraints, and the distributions of internal force such as moment and torque under the vertical load were studied. Based on the general program ABAQUS, a three-dimensional finite element model considering material nonlinearity and damage was established to study the influence of floor constraints on the bearing capacity of the curved beam structure. The results show that there is a large margin of safety for the design of the curved beam; the floor has a significant effect on the constrains of torsional deformation for the curved beam, which makes the positive and negative torques more balanced for the curved section and the straight section of the curved beam; the floor constraints can enhance the bearing capacity of the curved beam structure significantly.
Keywords:concrete curved beam； mechanical behavior； torsion resistance performance； thickness of the floor
*國家自然科學基金項目(51678072)，中機國際工程設計研究院有限責任公司科研項目(CX-B-2020-0001)，基于拓撲優(yōu)化的3d打印混凝土異形曲面結構成型(SJCX202022)。
作者簡介：劉志，碩士，Email:1411238985@qq.com； 通信作者：蔣友寶，博士，教授，Email: jiangybseu@163.com。
