混凝土连续曲线箱梁桥在多车荷载作用下的冲击效应分析

黄新艺;卓卫东;上官萍;李岩

振动与冲击 ›› 2012, Vol. 31 ›› Issue (24) : 137-142.

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PDF(1919 KB)
振动与冲击 ›› 2012, Vol. 31 ›› Issue (24) : 137-142.
论文

混凝土连续曲线箱梁桥在多车荷载作用下的冲击效应分析

  • 黄新艺1,卓卫东1,上官萍1,李岩2
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IMPACT EFFECT ANALYSIS OF CONTINUOUS CONCRETE CURVED BRIDGE DUE TO MULTI-VEHICLE LOADING

  • HUANG Xin-yi1, ZHUO Wei-dong1, SHANG-GUAN Ping1, LI Yan2
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摘要

针对多跨连续曲线梁的车桥耦合振动问题,分别采用三梁式模型和12自由度的车辆模型对桥梁和车辆进行模拟,通过快速傅立叶逆变换采用三角级数方法模拟了桥面不平度及其速度项,考虑桥梁结构阻尼的影响,采用基于ANSYS的分离迭代算法研究了多个车辆荷载共同作用下连续曲线箱梁桥不同控制截面位置的内力和挠度响应的主要差异及其随车速的变化规律。研究表明:横向加载车道数对支点扭矩、跨中扭矩、支点弯矩和墩顶截面弯矩的最大动力放大系数有很大影响, 而对主梁的竖向挠度和墩柱的轴力最大动力放大系数影响很小;纵向加载车辆数对桥梁的冲击效应有很大影响;桥梁的动力放大系数随车头间距增大显著提高而最大效应则大大减小。研究结果可为多跨连续曲线箱梁桥的设计提供参考。

Abstract

The dynamic behavior of multi-span continuous curved bridges under heavy trucks are investigated, the bridges are discretized by triple-beam model and the trucks are simulated as 12 DOFs models. The inverse fast Fourier transformation is applied to generate road irregularity and its velocity term of grade B according to the power spectral density of road roughness. The impact effects in various posittion of curved bridges under multi-vehicle action and different velocities are investigated considering bridge damping using separate iteration method based on ANSYS. The analytical results show that the number of lateral loading lanes has great effect on the fulcrum and the mid-span torques, negative bending moment and the bending moment of the top pier section maximum impact factors, while it has little effect on the maximum displacement impact factor of the girder and axial force impact factor of the pier. The number of longitudinal loading vehicles has significant influence on bridge impact effects, and the impact factors increase with increasing space headway while the corresponding maximum responses decrease. The presented results can be used in the design of continuous curved box girder bridges.

关键词

连续曲线梁桥 / 多车荷载 / 耦合振动 / 车头间距 / 横向加载车道数 / 纵向加载车辆数

Key words

continuous curved bridges / multi-vehicle loading / coupled vibration / space headway / number of lateral loading lanes / number of longitudinal loading vehicles

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黄新艺;卓卫东;上官萍;李岩. 混凝土连续曲线箱梁桥在多车荷载作用下的冲击效应分析[J]. 振动与冲击, 2012, 31(24): 137-142
HUANG Xin-yi;ZHUO Wei-dong;SHANG-GUAN Ping;LI Yan. IMPACT EFFECT ANALYSIS OF CONTINUOUS CONCRETE CURVED BRIDGE DUE TO MULTI-VEHICLE LOADING [J]. Journal of Vibration and Shock, 2012, 31(24): 137-142

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