Local response analysis of steel-concrete composite submerged floating tunnel under collision
YANG Ying1, HAN Jiajia1, XIANG Yiqiang2, HE Yuliang1
1. College of Civil Engineering，Shaoxing University, Shaoxing 312000, China;
2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Abstract：Here, to improve the safety of a submerged floating tunnel (SFT) under collision from outside, steel-concrete composite cross-section was proposed for its tube body. Considering material nonlinearity and strain rate effect, the finite element software ABAQUS was used to numerically simulate local responses of RC cross-section, inner lining type composite cross-section and outer sticking type composite cross-section, respectively under collision. Through analyzing collision impact force, concrete damage development and energy consumption, anti-collision performances of these three cross-sections were compared, and effects of steel plate thickness on local impact response of inner lining cross-section were analyzed. The results showed that collision can cause concrete collapse at the tunnel tube body wall inner side and penetrating damage of tunnel tube wall to threaten the structure safety; the outer sticking steel plate can increase peak value of impact force and aggravate tube body’s concrete damage to be unfavorable to tunnel structure; inner lining steel plate can reduce tube body concrete damage to a certain extent, and can effectively prevent concrete collapse on inner side of tube body under collision to have good tightness and comprehensive anti-impact performance; the tube body residual deformation can be reduced by increasing the inner lining steel plate thickness, but too large steel plate thickness can cause increase in cracking range of concrete tube, so this thickness should be checked by comprehensively considering deformation of tunnel tube body and concrete damage when designing SFT.
杨赢，韩嘉佳，项贻强，何余良. 碰撞作用下钢-混组合悬浮隧道管体局部响应分析[J]. 振动与冲击, 2021, 40(19): 151-156.
YANG Ying, HAN Jiajia, XIANG Yiqiang, HE Yuliang. Local response analysis of steel-concrete composite submerged floating tunnel under collision. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(19): 151-156.
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