| 聚氨酯伸缩体桥梁无缝伸缩装置界面安全性研究 |
| Study on Interface Safety of Polyurethane Expansion Body in Seamless Bridge Expansion Devices |
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| 中文关键词:无缝伸缩装置 聚氨酯伸缩体 界面安全性 粘结拉伸强度 剪切强度 足尺拉伸试验 |
| 英文关键词:seamless expansion device polyurethane expansion body interface safety bond tensile strength shear strength full scale tensile test |
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| 中文摘要: |
| 聚氨酯伸缩体无缝伸缩装置是一种新型结构，由聚氨酯伸缩体、角钢和混凝土组成，安装于桥梁拼接缝处。通过粘结拉伸和斜剪试验，系统分析了环境温度、混凝土基面处置工艺、角钢基面粘结剂涂布量和金刚砂洒布量等因素对界面安全性的影响，并通过足尺拉伸试验进行界面安全性验证。试验结果表明：温度越高，伸缩体与混凝土基面的粘结强度越低，打磨混凝土基面可显著提升粘结强度；在金刚砂洒布量为1.1 kg/m2、粘结剂涂布量为0.6 kg/m2的条件下，聚氨酯伸缩体与角钢的界面粘结性能最为优异，可有效保证无缝伸缩装置界面安全性。研究成果可为桥梁无缝伸缩缝的设计和应用提供科学依据。 |
| 英文摘要: |
| The polyurethane expansion joint system is an innovative structure composed of a polyurethane expansion body, angle steel, and concrete, designed for installation at bridge joints. This study systematically analyzes the impact of factors such as environmental temperature, concrete substrate treatment, adhesive application on the angle steel surface, and emery distribution on interface safety through tensile bonding and inclined shear tests. Interface safety performance is further validated through full scale tensile tests. The results indicate that increasing temperatures reduce the bond strength between the expansion body and the concrete substrate, while surface polishing significantly enhances this bond. Optimal bonding between the polyurethane expansion body and angle steel is achieved with a emery application of 1.1 kg/m2 and adhesive application between 0.6 to 0.7 kg/m2. This interface treatment method effectively ensures the reliability of the seamless expansion device interface. These findings provide a scientific foundation for the design and implementation of seamless expansion joints in bridge. |
| 张雷.聚氨酯伸缩体桥梁无缝伸缩装置界面安全性研究[J].国防交通工程与技术,2024,22(6):41~45,11 |
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