| 预应力混凝土连续梁桥桥面爆炸损伤试验研究 |
| |
| 引用本文： | 院素静,宗周红,娄凡,林津.预应力混凝土连续梁桥桥面爆炸损伤试验研究[J].中国公路学报,2022,35(11):160-170. |
| |
| 作者姓名： | 院素静 宗周红 娄凡 林津 |
| |
| 作者单位： | 1. 长安大学 公路学院, 陕西 西安 710064;2. 东南大学 爆炸安全防护教育部工程研究中心, 江苏 南京 211189;3. 东南大学 土木工程学院, 江苏 南京 211189;4. 上海市政工程设计研究总院(集团)有限公司, 上海 200092 |
| |
| 基金项目： | 国家自然科学基金项目（52178462，52008031）；国家重点研发专项（2021YFC3100700） |
| |
| 摘 要： | 为了研究桥面爆炸荷载作用下预应力混凝土连续T梁桥的抗爆性能，进行了2×8 m两跨预应力混凝土连续T梁桥模型的野外爆炸试验，并结合数值模拟的方法，研究了不同爆心位置和桥面爆炸荷载作用下预应力混凝土连续T梁桥的动力响应、破坏模式及损伤程度。研究结果表明：跨中桥面上方发生爆炸时，预应力混凝土连续T梁桥桥面破坏形态均表现为桥面板混凝土破碎开洞、T梁腹板和梁底混凝土崩落，属局部冲切破坏；中墩墩顶上方发生爆炸时，预应力混凝土连续T梁桥桥面未发生严重毁伤，邻近中支点的横隔板出现由顶部爆心轴线处向横隔板底放射形扩散的裂缝。相同药量和爆心高度下，桥面中梁跨中爆炸时中梁底加速度峰值最大，桥面边梁跨中爆炸时中梁底加速度峰值最小；提升混凝土强度、箍筋加密布置、施加预应力和增大宽跨比等能一定程度地提高主梁的抗爆性能；研究成果可供梁桥的抗爆防护设计参考。
|
| 关 键 词： | 桥梁工程 预应力混凝土连续梁 爆炸试验 爆炸数值模拟 爆炸动力响应 爆炸损伤分析 |
| 收稿时间： | 2020-02-16 |
Experimental Study on Damage of Prestressed Concrete Continuous Girder Bridge Subjected to Explosions Above the Deck |
| |
| YUAN Su-jing,ZONG Zhou-hong,LOU Fan,LIN Jin.Experimental Study on Damage of Prestressed Concrete Continuous Girder Bridge Subjected to Explosions Above the Deck[J].China Journal of Highway and Transport,2022,35(11):160-170. |
| |
| Authors: | YUAN Su-jing ZONG Zhou-hong LOU Fan LIN Jin |
| |
| Affiliation: | 1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;2. Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China;3. School of Civil Engineering, Southeast University, Nanjing 210096, Jiangsu, China;4. Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Shanghai 200092, China |
| |
| Abstract: | In order to study the blast-resistant capability of prestressed concrete continuous T-girder bridges under explosions above the deck, the field explosion test of the 2×8 m two-span prestressed concrete continuous T-girder bridge model was carried out, and the dynamic response, failure mode and damage degree of the prestressed concrete continuous T-girder bridge under the explosion above the deck with different explosive center position were studied in combination with the numerical simulation method. The results show that when explosions above the deck occur at mid-span, the damage patterns of the prestressed concrete continuous T-girder bridge are characterized by the broken of the concrete deck, the spalling of the web and the bottom of the girder. They are local punching failures. When explosions above the deck occur at the top of the middle pier, the deck of the prestressed concrete continuous T-beam bridge is not seriously damaged, and the diaphragm adjacent to the middle bearing has cracks radially spreading from the top explosive center axis to the bottom of the diaphragm. At the same charge weight and height, the peak acceleration at the bottom of the central girder is the largest when the explosion occurs at the mid-span of the central girder, and the peak acceleration at the bottom of the central girder is the smallest when the explosion occurs at the mid-span of the side girder. Improving the strength of concrete, infilling arrangement of stirrups, applying prestress and increasing the ratio of width to span can improve the blast-resistant performance of girders to some extent. The research results can be used as references for the blast-resistant protection design of girder bridges. |
| |
| Keywords: | bridge engineering prestressed concrete continuous girder bridge blast experiment numerical simulation of explosion dynamic response of blast loading blast damage analysis |
|
| 点击此处可从《中国公路学报》浏览原始摘要信息 |
|
点击此处可从《中国公路学报》下载全文 |
|
