基于静载试验的双曲拱桥腹拱开裂影响研究

Research on cracking effect of ventral arch of double curved arch bridge based on static load test

以某腹拱严重开裂的双曲拱桥为背景,分别建立无裂缝模型与腹拱裂缝处铰接的腹拱开裂模型进行理论计算,并结合静载试验结果进行对比分析,结果表明,在腹拱拱顶设置铰接可较好地模拟腹拱开裂,腹拱开裂对拱上建筑的联合作用影响较小,尤其对主拱圈拱顶截面与拱脚截面的影响甚微,但腹拱开裂使得荷载作用下腹拱圈的竖向位移量大幅增加,仍应引起重视。

Based on a double curved arch bridge with serious cracking of ventral arch,the crack free model and the model of hinge joint at crack of ventral arch are established respectively for theoretical calculation,and the static load test results are compared and analyzed.The results show that setting hinged joints on the top of ventral arch can better simulate the cracking of ventral arch,and the cracking of ventral arch has little effect on the combination operation of the spandrel construction,especially on the top of main arch ring.However,the cracking of the ventral arch makes the vertical displacement of the ventral arch ring increase greatly under the action of load,which should be paid attention to.