...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bridge structures >Evaluation of live-load distribution factors for high-performance prestressed concrete girder bridges
【24h】

Evaluation of live-load distribution factors for high-performance prestressed concrete girder bridges

机译：高性能预应力混凝土梁桥的活载分配因子评价

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Advancement in bridge design/construction technologies altered typical bridge parameters utilized in the development of AASHTO LRFD live-load distribution factors developed more than two decades ago. A girder bridge constructed using high-performance, high-strength concrete has been instrumented and tested under controlled-load condition. AASHTO LRFD distribution factors were compared to the factors computed from girders measured strains. AASHTO LRFD distribution factors were on average 21% higher than computed factors. A detailed finite element model (FEM) was developed and calibrated to match the controlled load test results. Several variations of the FEM were created to account for the presence of end intermediate diaphragms, girders continuity, and bridge skewness. The addition of end diaphragms decreases distribution factors on average by 6% while addition of intermediate diaphragms redistributes the moments between interior and exterior girders. Effect of diaphragms was more evident for bridge with large skew angles and less significant for skew angles less than 20°. Bridges with skewness have decreased distribution factors which was evident for skew angle in excess of 20°; AASHTO LRFD has good estimates of skewness effect on distribution factors. Considering the continuity effect in the calibrated FEM revealed that AASHTO LRFD distribution factors are overestimated on average by 17%.
机译：桥梁设计/施工技术的进步改变了典型的桥梁参数，在二十年前超过二十年前开发的AASHTO LRFD活力分布因子。采用高性能，高强度混凝土构造的梁桥已经在控制负载条件下进行了仪表和测试。将AASHTO LRFD分布因子与从梁测量菌株计算的因素进行比较。 AASHTO LRFD分布因子平均比计算因素高21％。开发并校准了详细的有限元模型（FEM）以匹配受控负载测试结果。创建了几个有限元的变化，以考虑最终中间隔膜，梁连续性和桥梁偏振。末端隔膜的添加平均降低分布因子6％，同时添加中间隔膜的添加重新分配内部和外部梁之间的时刻。对于具有大歪斜角度的桥梁的桥梁的效果更明显，并且对于小于20°的歪斜角度不太重要。具有偏斜的桥梁具有减少的分布因子，这对于超过20°的倾斜角度是显而易见的; AASHTO LRFD对分布因子的偏斜效应良好。考虑到校准有限元中的连续性效果显示AASHTO LRFD分布因子平均高估17％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号