REINFORCED CONCRETE MEMBERS WITH CYCLIC LOADING
REINFORCED CONCRETE MEMBERS WITH CYCLIC LOADING
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发表时间：
1972-07
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影响因子：
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通讯作者：
R. Park;D. Kent;R. Sampson
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文献类型：
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作者：
R. Park;D. Kent;R. Sampson
利用钢筋和混凝土的应力-应变曲线，推导了反复荷载作用下钢筋混凝土构件的理论弯矩-曲率关系。理论曲线与试验结果进行了比较，并说明了弯曲刚度的变化，由于钢的Bauschinger效应和混凝土的压缩区中可能最终关闭的开放裂缝的存在。这些裂缝意味着在第一次屈服偏移之后的弯矩-曲率曲线的大部分中，阻力矩仅由钢力偶提供。在循环荷载的这一部分中，混凝土的主要作用是防止钢筋屈曲。对于顶部和底部钢筋面积有显著差异的梁和柱，弯矩-曲率环显示出箍缩效应，并且环面积明显小于常用的弹塑性理想化。
Theoretical moment-curvature relationships for reinforced concrete members with cyclic loading are derived using stress-strain curves for steel and concrete. The theoretical curves compare well with test results and illustrate the variation in flexural stiffness due to the Bauschinger effect of the steel and to the presence of open cracks in the compression zone of the concrete which may eventually close. These cracks mean that for large portions of the moment-curvature curves after the first yield excursion the moment of resistance is provided by a steel couple alone. During this part of the cyclic loading the main role of the concrete is to prevent buckling of the steel. For beams with a marked difference between the top and bottom steel areas and for columns the moment-curvature loops show a pinching in effect and the loop area is significantly smaller than that of the commonly used elastoplastic idealization.