钢筋混凝土箱梁顶板横向受力有效分布宽度的塑性分析
发布时间：2018-09-01 05:28
【摘要】：为了研究普通钢筋混凝土箱梁行车道板在塑性阶段的横向受力特征,得到箱梁顶板基于塑性理论的横向受力有效分布宽度的取值方法,制作了2个钢筋混凝土箱梁试验模型,对其上的2块顶板进行跨中局部加载并观测混凝土箱梁顶板从开裂到破坏的全过程,得到箱梁顶板的塑性铰线分布形式和极限荷载大小。基于2块顶板的破坏模式提出箱梁顶板的塑性分析模型;基于塑性铰线理论的极限分析推导了钢筋混凝土箱梁顶板在局部荷载作用下的极限荷载和塑性横向受力有效分布宽度的计算公式,并以试验结果验证其适用性;最后将试验结果和理论值与国内外相关桥梁设计规范的取值进行比较。研究结果表明:采用极限平衡法可以较好地确定钢筋混凝土箱梁顶板的极限承载力和塑性横向受力有效分布宽度;提出的简化破坏模式能刻化钢筋混凝土箱梁顶板在塑性阶段的横向受力特征;箱梁顶板在局部荷载作用下进入塑性阶段后,其横向受力有效分布宽度的大小与弹性阶段相比存在明显区别,极限状态下箱梁顶板基于塑性分析的横向受力有效分布宽度约为弹性解的2倍。
[Abstract]:In order to study the transverse force characteristics of the common reinforced concrete box girder in plastic stage, the effective distribution width of the transverse force on the box girder roof is obtained, and two test models of the reinforced concrete box girder are made. On the top of the concrete box girder, the plastic hinge distribution form and the limit load are obtained by observing the whole process of the concrete box girder roof from cracking to failure. Based on the failure mode of two roof plates, the plastic analysis model of box girder roof is proposed. Based on the limit analysis of plastic hinge theory, the formula for calculating the limit load and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder under local load is derived, and the applicability of the formula is verified by the test results. Finally, the test results and theoretical values are compared with the values of the relevant bridge design codes at home and abroad. The results show that the limit equilibrium method can be used to determine the ultimate bearing capacity and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder. The simplified failure mode proposed in this paper can carve out the transverse force characteristics of the reinforced concrete box girder roof in the plastic stage, and after the box girder roof plate enters the plastic stage under the local load, The effective distribution width of the transverse force is obviously different from that of the elastic stage, and the effective distribution width of the transverse force on the roof of the box girder under the limit state is about 2 times that of the elastic solution.
【作者单位】： 湖南大学土木工程学院;湖南工业大学土木工程学院;
【基金】：国家自然科学基金项目(51278182)
【分类号】：U441
本文编号：2216226
[Abstract]:In order to study the transverse force characteristics of the common reinforced concrete box girder in plastic stage, the effective distribution width of the transverse force on the box girder roof is obtained, and two test models of the reinforced concrete box girder are made. On the top of the concrete box girder, the plastic hinge distribution form and the limit load are obtained by observing the whole process of the concrete box girder roof from cracking to failure. Based on the failure mode of two roof plates, the plastic analysis model of box girder roof is proposed. Based on the limit analysis of plastic hinge theory, the formula for calculating the limit load and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder under local load is derived, and the applicability of the formula is verified by the test results. Finally, the test results and theoretical values are compared with the values of the relevant bridge design codes at home and abroad. The results show that the limit equilibrium method can be used to determine the ultimate bearing capacity and the effective distribution width of plastic transverse force on the roof of reinforced concrete box girder. The simplified failure mode proposed in this paper can carve out the transverse force characteristics of the reinforced concrete box girder roof in the plastic stage, and after the box girder roof plate enters the plastic stage under the local load, The effective distribution width of the transverse force is obviously different from that of the elastic stage, and the effective distribution width of the transverse force on the roof of the box girder under the limit state is about 2 times that of the elastic solution.
【作者单位】： 湖南大学土木工程学院;湖南工业大学土木工程学院;
【基金】：国家自然科学基金项目(51278182)
【分类号】：U441
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