傳統的鋼筋混凝土學針對梁的分析觀念係平面維持平面暨應變為線性圖，進行一連串的拉力與壓力平衡後，再逐一乘上折減係數後即可求得桿件抗彎、抗壓及抗剪之內力，並將中性軸以下之混凝土視同不存在，以方便計算兼具保守行為。然真實破壞時之受力與變形並非如此理想，就本討論主題因握裹造成鋼筋與混凝土接觸面之力學行為複雜，故ACI為簡便計算，自ACI77以後將撓曲握裹予以廢除，改以伸展長度方式以簡化計算，實有喪失探討求真之嫌，為此；本次研究主題擬單就考量簡支梁受集中荷重達非線性至破壞後之握裹引致彎曲行為，俾利了解撓曲握裹造成彎曲力學行為。
關鍵詞：混凝土、彎曲行為、平面維持平面、非線性連桿、握裹應力

ABSTRACT
A finite element model was developed to simulate the reinforced concrete beam.The plane stress elements were used to simulate the concrete other than the critical section. Three types of nonlinear link elements were used to simulate the reinforcements, the concrete in critical section, the bonding strength between reinforcement and concrete. The SAP2000 program was used as the analysis tool. The concept of plane remain plane is the key point of flexural design of concrete beams. However, the study of this analysis shows that plane does not remain plane. The displaced shape of cracked section is similar to two planes. One plane for the tensile zone, and the second plane exists in the compressive zone. The ultimate bending strength is close to the results of current design practice.

Keywords: concrete, bending behavior, plane remain plane, nonlinear links, bond strength

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