預應力混凝土梁板構件正截面抗彎承載力計算的壓彎模式
趙 勇 黃鼎業(yè) 李云貴 陳岱林 范美玲
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趙 勇 黃鼎業(yè) (同濟大學預應力研究所 上海 200092)李云貴 陳岱林 范美玲 (中國建筑科學研究院結構所 北京 100013)
[提要] 提出了采用壓彎模式計算預應力混凝土梁板構件正截面抗彎承載力的方法。該方法將平均有效預應力產(chǎn)生的綜合彎矩和綜合軸力視為荷載作用效應,將預應力增量部分視為抗力。該方法概念明確,避免了次內(nèi)力的計算,簡化了設計。
[關鍵詞] 抗彎承載力 預應力混凝土 壓彎模式 綜合內(nèi)力 次內(nèi)力
The method to calculate the ultimate flexural capacity on normal section of prestressed concrete beams and slabs with flexural-compression mode is presented, which regards the resultant moment and axial force produced by effective prestress as the load effects, while the part of prestress increment as the resistance. This method, which uses the resultant forces to design directly but not the secondary forces, simplifies the design process of prestressed concrete structures.
Keywords: ultimate bending capacity; prestressed concrete; flexural-compression member; resultant internal force; secondary internal force