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（中機(jī)國際工程設(shè)計(jì)研究院有限責(zé)任公司第二綜合設(shè)計(jì)研究所， 長沙 410007）
［摘要］由于弧形梁在豎向荷載作用下受力復(fù)雜，不僅存在彎矩、剪力，還有扭矩，其計(jì)算在結(jié)構(gòu)設(shè)計(jì)中是一大難點(diǎn)。常規(guī)設(shè)計(jì)軟件如PKPM，YJKS1-8在弧形梁計(jì)算中扭矩折減系數(shù)取值偏大，截面設(shè)計(jì)偏于保守。針對此設(shè)計(jì)現(xiàn)狀，對單跨無直線段圓弧梁及兩端帶直線段圓弧梁進(jìn)行了理論分析，并結(jié)合實(shí)際工程，采用常規(guī)設(shè)計(jì)軟件PKPM，YJKS1-8和本文的公式分別對單跨無直線段圓弧梁及兩端帶直線段圓弧梁的內(nèi)力進(jìn)行計(jì)算，基于梁內(nèi)力的理論分析結(jié)果與常用設(shè)計(jì)軟件分析結(jié)果的比較，提出軟件設(shè)計(jì)中扭矩折減系數(shù)的參考取值，建議將其默認(rèn)取值1-0改為0-85，符合結(jié)構(gòu)設(shè)計(jì)的“安全、適用、經(jīng)濟(jì)”目標(biāo)。
［關(guān)鍵詞］弧形梁； 鋼筋混凝土結(jié)構(gòu)； 復(fù)雜受力； 扭矩折減系數(shù)
中圖分類號：TU318， TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)18-0068-03
Analysis on the structural design of cast-in-place concrete curved beams
Zhang Jing
(The Second Comprehensive Design and Research Institute， China Machinery International Engineering Design & Research Institute Co., Ltd., Changsha 410007, China)
Abstract:Due to the complex forces of curved beam under vertical loads, there are not only bending moments, shear forces, but also torque, and the calculation of curved beam is a big difficulty in the structural design. Conventional design software such as PKPM and YJKS1-8 has a large torque reduction coefficient and the design calculation of curved beam section is conservative. In view of the current design situation, the theoretical analysis of curved beam with single span without straight line segment and curved beam with straight line segment at both ends were carried out. Combined with practical engineering, the conventional design software PKPM, YJKS1-8 and the theoretical analysis were used to calculate the internal forces of curved beam with single span without straight line segment and curved beam with straight line segment at both ends. The theoretical analysis results based on the internal force of the beam were compared with the analysis results of the common design software, and the reference value of torque reduction coefficient in the software design was proposed. It is recommended to change the default value of 1-0 to 0-85, conforming to the structure design of the “safe, applicable and economic” goals.
Keywords:curved beam; reinforced concrete structure; complex stress; torque reduction coefficient
作者簡介：張靜，碩士，工程師，Email: zhagnjing5192@126.com。
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