简支梁桥地震落梁失效控制模式研究

发布时间：2018-05-07 04:14

本文选题：简支梁桥 + 地震反应　；参考：《南京工业大学学报(自然科学版)》2014年02期

【摘要】：对地震作用下桥梁的落梁失效进行有效的控制,是桥梁抗震工程中的关键问题之一。考虑支座非线性、桥墩弹塑性和碰撞效应的影响,建立了5跨简支梁桥的有限元模型。采用非线性时程方法计算了多跨简支梁桥在墩-梁连接和梁-梁连接2种落梁失效控制模式下的纵向地震反应,并和无落梁失效控制时的桥梁反应进行了比较,分析了两类防落梁模式的控制机制和控制效果。研究了简支梁桥邻跨刚度比、防落梁连接刚度和初始间隙等参数对落梁失效控制效果的影响规律,进一步提出了有效的防落梁模式建议。研究表明:梁-墩连接控制模式可以有效地减小简支梁桥的位移反应,控制落梁失效,但会引起桥墩内力的增大,控制效果受到邻跨刚度比和控制系统参数的影响,梁-梁连接控制模式不能有效地控制落梁失效。
[Abstract]:It is one of the key problems in the seismic engineering of bridges to effectively control the failure of the bridges under the earthquake action. Considering the bearing nonlinearity, the elastoplastic and impact effects of the pier, a finite element model of the 5 span simple supported beam bridge is established. The nonlinear time history method is used to calculate the connection of the pier beam connection and the beam to beam connection of the multi span simple beam bridge. 2 kinds of longitudinal seismic responses under the failure control mode of the falling beam are compared with that of the bridge without the failure control of the falling beam. The control mechanism and control effect of the two types of beam prevention beam modes are analyzed. The influence of the stiffness ratio of the simple supported beam bridge, the stiffness of the beam and the initial clearance on the effect of the failure control of the falling beam is studied. The study shows that the beam pier connection control model can effectively reduce the displacement response of the simple supported beam bridge and control the failure of the beam, but it will cause the increase of the internal force of the pier, the control effect is affected by the ratio of the adjacent span stiffness and the parameters of the control system, and the beam beam connection control mode can not be effectively controlled. The falling beam is invalid.

【作者单位】：南京工业大学土木工程学院;北京工业大学建筑工程学院;
【基金】：江苏省高校自然科学基金(10KJA560012) 江苏省自然科学基金(BK20130937) 中国博士后科学基金(2012M520133)
【分类号】：U442.55

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