简支梁桥桥面连续结构力学特性理论分析

发布时间：2018-04-20 12:56

本文选题：桥梁工程 + 简支梁桥桥面连续结构　；参考：《中国公路学报》2017年07期

【摘要】：针对简支梁桥桥面连续结构易出现开裂、漏水和啃边等常见的病害问题,基于线弹性理论,采用结构力学方法推导了在汽车活载与温度效应联合作用下桥面连续结构的应力求解公式,并以某工程实例为算例,利用ABAQUS有限元软件对所推导的应力公式进行了验证。通过对桥面连续结构受力性能的综合分析,得出其主要影响因素有桥面连续结构的厚度、无黏结段长度和所用材料种类。最后,对这些影响参数进一步分析,得出了上述各参数对连续桥面结构受力和跨中挠度的影响程度以及影响桥面连续结构受力的最显著参数。结果表明:推导得到的桥面连续结构简化计算公式能够较精确地计算结构在汽车活载、温度效应等作用下的受力特征;随着铺装层厚度的增大,桥面连续段混凝土铺装层上、下表面的受力均有较大幅度的减小,上表面最大受力与厚度大致呈线性关系;当采用沥青混凝土与不采用沥青混凝土的桥面铺装层构造时,两者上表面最大主拉应力基本相同,但后者的下表面最大拉应力远大于前者;铺装层选择沥青混凝土面层与混凝土现浇层的组合设计较为合理;增加混凝土铺装层厚度和设置无黏结段是较为有效的改进方案,其中以设置无黏结段效果最好;每跨的无黏结段长度设为跨长的5%左右能够显著减小桥面连续结构的最大拉应力;研究结果可为简支桥梁桥面连续结构的受力计算及较为精确的设计方法提供理论指导。
[Abstract]:In view of the common problems such as cracking, leakage and edge gnawing in continuous structure of simply supported girder bridge deck, the linear elasticity theory is used to solve the problem. The stress solution formula of bridge deck continuous structure under the combined action of vehicle live load and temperature effect is derived by using structural mechanics method. Taking a engineering example as an example, the deduced stress formula is verified by ABAQUS finite element software. Through the comprehensive analysis of the mechanical properties of the continuous structure on the bridge deck, it is concluded that the main influencing factors are the thickness of the continuous structure of the bridge deck, the length of the unbonded section and the kinds of materials used. Finally, through further analysis of these influence parameters, the influence degree of the above parameters on the stress of continuous deck structure and midspan deflection and the most significant parameters affecting the stress of continuous deck structure are obtained. The results show that the simplified formula of continuous bridge deck structure can accurately calculate the stress characteristics of the bridge deck under the action of live load and temperature effect, and with the increase of the thickness of pavement, the concrete pavement in continuous section of bridge deck can be calculated more accurately. The maximum force on the upper surface is linear with the thickness of the upper surface, and the maximum principal tensile stress of the upper surface is basically the same when the asphalt concrete is used and the bridge deck pavement without asphalt concrete is constructed. However, the maximum tensile stress on the lower surface of the latter is far greater than that of the former; the combination design of asphalt concrete surface and concrete cast-in-situ layer is more reasonable for the pavement, and increasing the thickness of the concrete pavement and setting the unbonded section are the more effective improvement schemes. The maximum tensile stress of the continuous bridge deck structure can be significantly reduced when the length of the unbonded section of each span is about 5% of the span length. The research results can provide theoretical guidance for the force calculation and more accurate design method of the bridge deck continuous structure of simply supported bridge.
【作者单位】：浙江工业大学建筑工程学院;福州大学土木工程学院;海峡(福建)交通工程设计有限公司;
【基金】：国家自然科学基金项目(51278126,51578161) 浙江省自然科学基金项目(LY17E080022)
【分类号】：U441;U448.217

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