摘要
为探明交通荷载作用下预制综合管廊受力特性,考虑管廊承插式接口、预应力筋张拉影响,基于管-土非线性相互作用,建立管廊结构三维数值模型。通过现场原型车辆荷载试验对比分析,验证了数值模型有效性。在此基础上,研究了不同车载状态下综合管廊纵向和接口段的力学特性及其变化规律:管廊纵向Mise应力分布在各个承插接口处均不连续,峰值出现在中间承插接口处,并逐渐向两端衰减,纵向影响范围大致在加载位置的相邻两节管廊;管廊接口处顶板内侧、左右侧墙外侧以及底板内侧受拉,顶板外侧、左右侧墙内侧、底板外侧受压;承口端的侧墙底部、顶板下侧跨中和插口端的顶板下侧跨中处混凝土为最大拉应力部位。结果表明:管廊结构应力与荷载幅值正相关;加载位置改变对管廊接口处承口端受力影响较明显。
In light of the mechanical characteristics of prefabricated integrated pipe gallery under traffic loads,a 3D numerical model of pipe gallery,considering the influence of socket joint and tension of prestressing tendons,is established based on the non-linear interaction between pipe and soil. The numerical model is proved effective through the comparison with the field prototype vehicle load test results. Then,the mechanical properties of longitudinal and interface sections of the integrated pipe gallery under different vehicle loads are investigated.The results show that the longitudinal Mise stress distribution of the pipe gallery is discontinuous at each socket interface. The peak value appears at the middle of the socket interface,and gradually attenuates to both ends.The longitudinal influence range is close to the adjacent two pipe galleries at the loading position. The inner side of the roof,the outer side of the left and right walls and the inner side of the floor at the pipe gallery interface are pulled,while the outer side of the roof,the inner side of the left and right walls and the outer side of the floor are compressed. The concrete at the bottom of side wall and the inner midspan of roof at the socket are the places where the maximum tensile stress occurs,which should be paid attention to. The stress of the pipe gallery structure is positively correlated with the load amplitude,and the change of the loading position has obvious influence on the stress of the bell joint.
作者
徐健
谢忠球
吴敬龙
XU Jian;XIE Zhongqiu;WU Jinglong(Department of Civil Engineering,Central South University of Forestry and Technology Changsha,410004,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2021年第2期377-384,417,共9页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51408617)
湖南省省级工程建设新技术与软科学研究计划资助项目(430S00711/2018-42557)。
关键词
预制综合管廊
承插式接口
交通荷载
数值模拟
力学特性
integrated pipe gallery
socket joint
traffic load
numerical simulation
mechanical characteristics
