For the bridge tower with large inclination angle, the beam element in Midas finite element software is used to model and analyze the bridge tower structure, and its accuracy is difficult to guarantee. In this paper, taking the construction of a suspension bridge’s inward-inclined tower as the research background, the finite element simulation of the inward-inclined bridge tower is carried out by using the two modeling methods of the beam element and the solid element. The calculation accuracy of the beam element model, the specific position and the jacking force applied by the active transverse brace of the inward-inclined bridge tower are determined, and the field test of the tower bottom stress during the construction process is performed. The results show that: when the inclination angle of the bridge tower is small (5 °), the beam element element is used for modeling and analysis, which has fast calculation speed and high calculation accuracy; When the inclination angle is 15 °, the error of the beam element model exceeds 30%, and it is recommended to use the solid model for calculation; the active cross brace plays a key role in controlling the stress at the bottom of the tower column before the lower cross beam is applied. And after the construction of the cross beam, the active cross brace forms a closed frame structure with the lower tower column, and the subsequent cross brace has little impact on the stress at the bottom of the tower column; Compared with increasing the number of temporary cross braces, increasing the jacking force can improve the stress at the bottom of the tower. And by adjusting the position of the active cross brace and applying the appropriate active jacking force, the stress at the root of the tower column can be greatly improved.

为了研究空心板桥铰缝损伤定性识别方法,分别对两座13 m跨径的空心板桥进行有限元计算和实桥试验研究,两座桥梁中其中一座铰缝完好,另一座铰缝有不同程度损伤,将计算结果与实测值进行了比较,分析了铰缝不同损伤状态下的挠度横向分布情况.结果表明,铰缝完好时各片板的挠度校验系数趋于一致,线性回归斜率趋近于0;铰缝有损伤时,各片板的挠度校验系数相差较大,与铰缝损伤密切相关.研究成果可定性判定铰缝是否损伤及损伤的严重程度,为桥梁养护维修提供技术依据.

本文以公路双组分标线为基础,优选环保、耐久性好的材料,研究了不同标线组成材料对反光性能和耐久性能的影响,开发出一种环保耐久高辨识性标线材料.经检测,该标线材料性能满足规范要求,且反光性能和耐久性高于甲基丙烯酸甲酯(MMA)双组分标线.

高反光性能双组份标线以聚甲基丙烯酸甲酯(PMMA)为主要树脂的标线材料,采用大粒径、高成圆率玻璃珠,具有优异的反光性能.本文对其在应用过程中涉及的标线清除和施工工艺展开了分析.通过对目前各种标线清除技术的研究,推荐使用高压水射流清除法.提出了喷涂施工和刮涂施工的适用范围和具体施工工艺,以及提高标线施工质量的措施,为高速公路高反光性能双组份标线的应用提供借鉴.

通过对比分析某预应力混凝土连续梁桥加固前后的试验数据,评估了加固效果,指出当前体外预应力加固设计的不足,并通过分析计算提出了一种更为有效的体外预应力加固设计方法.

The silt in the Yellow River alluvial plain has low clay content, low cohesion and poor structure. Its stability has always been a difficult problem in the engineering field. In order to improve the engineering properties of the silt in the alluvial plain of the Yellow River, a new type of silt composite flexible curing agent was prepared by using sintered red mud and matrix asphalt as the main materials to comprehensively stabilize the silt. The aim of this study was to investigate the effects of sintered red mud-asphalt composite flexible curing agent on aged mechanical properties of treated silt, in which the replacement levels of the flexible curing agent below 10% by weight are compared. Apart from the compressive strength, the drying shrinkage, low temperature freeze-thaw and high temperature self-healing ability are measured. The test results show that the flexible curing agent has a positive effect on improving the mechanical properties of stabilized silt. The flexible curing agent series exhibit higher compressive strength, better water stability, resistance to freeze-thaw and high temperature self-healing ability, and lower drying shrinkage compared to silt and cement stabilized silt. The preferred dosage 4%~6% of the flexible curing agent is obtained by mechanical property analysis. The SEM images show that the incorporation of the flexible curing agent helps the silt form dense cementation and non-connected microporous structure, that is beneficial to the improvement of water stability and frost resistance. The asphalt component in the flexible curing agent can reorganize and diffuse in the soil, fill the internal pores and micro cracks, and realize the repair of soil damage and structural reinforcement.

装配式空心板桥在我国中小跨径桥梁的建设中应用广泛,空心板桥的设计中常采用空间梁格法建立杆系有限元模型进行计算.为了研究装配式空心板桥的杆系有限元建模方法,进行了 8 m跨径的5片空心板桥足尺模型试验,将试验结果与实体有限元分析结果对比分析,并且将考虑不同虚拟横梁刚度的杆系有限元分析结果与实体有限元分析结果对比分析.结果表明,实体有限元模型建模方法能较好模拟装配式空心板桥整个加载过程受力状态和横桥向传力性能;空心板桥杆系有限元建模时,8 m和10m空心板桥的虚拟横梁高度取0.8倍铰槽深度,13 m和16 m空心板桥的虚拟横梁高度取0.6倍铰槽深度时,可得较精确的计算结果.