考虑正负弯曲的连续桥面简支梁桥力学分析与结构优化
PDF下载 (259)石鑫磊,丁 勇,陈 隆,游玖昂.考虑正负弯曲的连续桥面简支梁桥力学分析与结构优化[J].宁波大学学报(理工版),2023,36(5):37-43.DOI:10.20098/j.cnki.1001-5132.2022.0905
SHI Xinlei,DING Yong,CHEN Long,YOU Jiu’ang.Mechanical analysis and structural optimization of simply supported girder bridge with continuous deck considering positive and negative bending[J].Journal of Ningbo University(Natural Science & Engineering Edition),2023,36(5):37-43.DOI:10.20098/j.cnki.1001-5132.2022.0905
| Title: | Mechanical analysis and structural optimization of simply supported girder bridge with continuous deck considering positive and negative bending |
| 作者: | 石鑫磊, 丁 勇, 陈 隆, 游玖昂 |
| Author(s): | SHI Xinlei, DING Yong, CHEN Long, YOU Jiu’ang |
| 关键词: | 连续桥面板; 有限元; 桥梁工程; 结构优化; 超高性能混凝土 |
| Keywords: | continuous deck; finite element; bridge engineering; structural optimization; ultra-high performance concrete |
| 分类号: | U443.3 |
| DOI: | 10.20098/j.cnki.1001-5132.2022.0905 |
| 文献标识码: | A |
| 摘要: | 连续桥面简支梁桥的桥面连续段是结构受力的薄弱部位, 容易出现开裂、渗水等问题, 因此有必要对连续桥面段的力学性能进行详细分析. 本文首先建立了包含主梁与桥面连续段的有限元分析模型, 然后根据常见桥梁受力状况, 确定最不利汽车荷载工况时, 连续桥面段的最大负弯矩、温度梯度工况下连续桥面段的最大正弯矩. 再分别求解最大正、负弯矩作用下的连续桥面段的应力应变, 发现汽车荷载下的连接桥面段顶部受拉, 温度梯度下的连接桥面段底部受拉, 最大拉应力都可能超过普通混凝土的拉伸强度. 最后通过增加脱粘区长度、采用超高性能混凝土材料(Ultra-High Performance Concrete, UHPC)等改进措施, 对连续桥面段进行结构优化, 减小了最大应力, 使连续桥面板安全耐久. |
| Abstract: | The continuous deck on the simply supported girder bridge with continuous deck is the weak part of the structure, which is prone to crack, water seepage and other diseases. Therefore, it is necessary to analyze the mechanical properties of the continuous deck in detail. In this paper, a finite element model including the continuous deck and the main girder is established. The maximum negative bending moment of the continuous deck under the most unfavorable vehicle loads and the maximum positive bending moment of the continuous deck under the temperature gradient application are determined by considering the common working conditions of bridges. Then, the stress and strain of the continuous deck under the maximum positive and negative bending moments are solved respectively. It is found that the top of the continuous deck under the vehicle load is in tension, and the bottom of the connecting deck under the temperature gradient is in tension. The maximum tensile stress may exceed the allowable tensile strength of the ordinary concrete. Finally, by increasing the length of debonded zone and adopting ultra-high performance concrete (UHPC), the structure of continuous deck is optimized and the maximum stress is reduced, which makes the continuous deck safe and durable. |
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| 备注/Memo: | 收稿日期: 2022－09－02. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（52078256）; 浙江省自然科学基金（LY19E080009）; 宁波市交通运输科技项目（202104）. 第一作者: 石鑫磊（1987－）, 男, 浙江宁波人, 高级工程师, 主要研究方向: 道路与桥梁工程. E-mail:624102541@qq.com *通信作者: 丁勇（1975－）, 男, 浙江余姚人, 教授, 主要研究方向: 桥梁工程. E-mail:dingyong@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
