桥面铺装对中小跨径PC梁桥校验系数影响分析

发布时间：2019-02-16 02:56

【摘要】：为了研究中小跨径预应力混凝土梁桥桥面铺装层对桥梁结构荷载试验校验系数的影响,以114座预应力混凝土连续箱梁及空心板桥作样本,分别计算在不考虑桥面铺装、考虑一半铺装和考虑全部铺装下桥梁结构的横向分布系数的变化,基于不同的保证率给出了3种情况下桥梁结构应变和挠度校验系数的统计规律及统计参数,最后分析了铺装层对桥梁结构校验系数的影响程度,并提出了中小跨径预应力混凝土梁桥考虑铺装不同作用程度的常见校验系数范围.分析结果表明:混凝土铺装厚度对预应力混凝土梁桥横向分布影响很小,而对其结构校验系数的影响程度较大.对于预应力混凝土空心板桥,与不考虑混凝土铺装相比,考虑全部混凝土铺装时的应变校验系数提高约24%,挠度校验系数提高约45%;对于预应力混凝土箱梁桥,与不考虑混凝土铺装相比,考虑全部混凝土铺装时的应变校验系数提高约11%,挠度校验系数提高约21%.其结论可为同类梁桥荷载试验承载能力评定作参考.
[Abstract]:In order to study the influence of deck pavement on load test check coefficient of bridge structure, 114 prestressed concrete continuous box girders and hollow slab bridges are taken as samples. Considering the change of lateral distribution coefficient of bridge structure under half pavement and considering all pavement, the statistical rules and parameters of check coefficient of strain and deflection of bridge structure under three conditions are given based on different guarantee rate. Finally, the influence of pavement on the check coefficient of bridge structure is analyzed, and the common check coefficient range of medium and small span prestressed concrete beam bridge considering different action degree of pavement is put forward. The results show that the thickness of concrete pavement has little effect on the transverse distribution of prestressed concrete beam bridge, but has a great influence on the check coefficient of the structure. For prestressed concrete hollow slab bridge, the strain check coefficient and deflection check coefficient are increased about 24% and 45% respectively. For prestressed concrete box girder bridge, the strain check coefficient and deflection check coefficient are increased about 11% and 21% respectively. The conclusion can be used as a reference for the load capacity assessment of similar girder bridges.
【作者单位】：西安公路研究院;长安大学公路学院旧桥检测与加固技术交通行业重点实验室;云南省公路科学技术研究院;
【基金】：新世纪优秀人才支持计划(NCET-10-0250) 陕西省交通科技项目(14-26T) 中央高校基本科研业务专项基金项目(CHD2012JC030) 云南交通厅科技项目2011-2-b(05)
【分类号】：U443.33

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