滚石作用下高墩大跨刚构桥动力响应分析
首发时间:2012-11-01
摘要:滚石是山区三大地质灾害之一,严重威胁着结构物的安全。山区特殊的地形、地质条件决定了高墩大跨的连续刚构桥有其独特优势而大量修建。针对滚石对高墩大跨刚构桥的影响,本文提出了利用两阶段分析法结合隐式-显式序列求解技术的高墩大跨刚构桥滚石作用下的损伤及动力响应的分析方法。以某山区高墩连续刚构桥为例,开展了在不同滚石大小、速度下、撞击角度、撞击位置等参数影响下的动力响应分析。研究表明,滚石的撞击引起的损伤具有局部特性,撞击力表现为极短暂三角形脉冲。
关键词: 滚石 高墩大跨刚构桥 两阶段分析法 隐式-显式序列求解 动力响应
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Analysis of Dyanmic characteristics for High Piers-long span Rigid Bridge Impacted by Rockfalls
Abstract:Rockfall is one of the three mountain geologic hazards which will threathen the safety of structures. While continuous rigid bridges are broadly used due to mountain topography and geologic conditions. Aiming at solving the influence of rockfall on mountain rigid bridges, two-stage analysis method, combined with implicit-explicit sequence solving technique, is proposed to obtain local damages and whole dynamic responses in this paper. A mountain high-pier continuous rigid bridge is investigated. Four parameters, such as the sizes of rock fall, velocities, impact angles, and impact positions are discussed. The local damages and dynamic responses are studied. The research result shows that damage caused by impact of falling rocks has local characteristics, and that the impact force shows greatly short time-span triangular pulse.
Keywords: Rockfalls High pier-long span rigid bridge Two-stage analysis method Implicit-explicit sequence solving technique Dynamic response
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