摘要
基于Euler-Bernoulli梁理论,推导了柔性边界RC梁在脉冲荷载作用下的动力响应计算方法,结合钢筋混凝土构件的动态极限抗力判别方法,分析了动荷载特征、支座刚度及支座阻尼对柔性边界RC梁破坏模式的影响规律.结果表明:在脉冲荷载作用下,柔性边界RC梁的破坏模式不仅与动载特性有关,还取决于边界条件;柔性边界可使RC梁的破坏时间明显延迟,动荷载加载速率越高、爆炸冲量越大,超压峰值越大,梁就越容易发生剪切破坏.
Calculation method of dynamic response for RC beams with flexible supports under pulse load is pres- ented based on theory of Euler-Bernoulli beam. The main factors such as the dynamic loading characteristics, stiffness and damping of supports that influence the failure modes of RC beams are investigated according to the discriminance of ultimate resistance for RC members. Results show that the failure modes of RC beam under pulse load depend not only on the loading characteristics, but also on the support conditions. The times of shearing failure for RC beams with flexible supports are delayed greatly, the higher dynamic loading rate and the larger values of blast impulses or blast overpressures, the more easily shearing failures would occur. The peak values of deflections, moments or shearing force attenuated greatly with the value of support damping being in- creased, but the failure modes and failing times are not changed obviously, and the support damping seems to have no effects on increasing the ultimate resistance of RC beams with flexible supports.
出处
《广州大学学报（自然科学版）》
CAS
2012年第1期64-68,共5页
Journal of Guangzhou University:Natural Science Edition
关键词
钢筋混凝土梁
柔性边界
动力响应
破坏模式
reinforced concrete beam flexible supports dynamic response failure mode
