（3）、少筋梁(under-reinforced beam)——脆性破坏：混凝土一开裂，受拉钢筋立即屈服， 梁断裂。 4、在什么情况下可采用双筋梁，在双筋截面中受压钢筋起什么作用？
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On the collapse behavior of the over-reinforced beam and the rare-reinforced beam, the two kinds of beam's mechanical analysis formula of different phase are deduced like the under-reinforced beam.
与适筋梁相仿，根据超筋梁和少筋梁的受力破坏特点，得到了两者在不同受力变形阶段的力学分析公式。
Many experimental results indicates, beam bar slippage within joints is a frequent local nonlinear response of reinforced concrete structures under the rare earthquakes.
大量试验结果表明，在罕遇地震作用下节点核心区内梁纵筋的粘结滑移是钢筋混凝土结构的一种比较常见的局部非线性反应。
Failure process for the reinforced concrete free beam under static loading is formulated based on the elastic damage theory with the finite element method.
将损伤力学理论与有限元法相结合，研究钢筋混凝土简支梁静载作用下的损伤破坏过程。
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