简支梁桥拱型桥面连续构造的受力性能

发布时间：2018-06-18 10:33

本文选题：简支梁桥 + 拱型桥面连续　；参考：《浙江大学学报(工学版)》2014年06期

【摘要】：针对国内简支梁桥桥面连续混凝土开裂的现状,建立有限元模型分析桥面连续构造的破坏机理.分析结果表明:造成桥面连续混凝土开裂的主要原因是简支梁的纵向位移、转动及不均匀沉降引起的内力,直接作用于混凝土或通过纵向连接钢筋传递至混凝土,为了改变内力的传递方式,解决桥面连续混凝土的开裂问题,根据拱型结构拱脚受拉使拱顶产生正弯矩的受力特点,提出一种新型的拱型桥面连续装置.为了验证该装置的有效性,制作了拱型桥面连续和传统型桥面连续的模型并进行了设计荷载下的受力试验.试验对比结果及有限元计算表明:拱型桥面连续装置对混凝土的拉力有较好的分散作用,大大减小了桥面连续混凝土的纵桥向拉应力,有效地改善了桥面连续混凝土的开裂损伤.
[Abstract]:In view of the current situation of continuous concrete cracking on the deck of simply supported beam bridges in China, a finite element model was established to analyze the failure mechanism of continuous structure of bridge deck. The results show that the main reason for the cracking of continuous concrete on the bridge deck is the longitudinal displacement of simply supported beam, the internal force caused by rotation and uneven settlement, which acts directly on the concrete or transfers to the concrete through the longitudinal connecting steel bar. In order to change the way of internal force transfer and solve the cracking problem of continuous concrete on bridge deck, according to the mechanical characteristics of arch structure arch foot under tension to make the arch roof produce positive bending moment, a new type of arch bridge deck continuous device is put forward. In order to verify the effectiveness of the device, the models of continuous arched deck and traditional deck are made and the stress tests under design load are carried out. The experimental results and finite element calculation show that the arch bridge deck continuous device has a good dispersion effect on the concrete tensile force and greatly reduces the longitudinal bridge tensile stress of the continuous concrete deck. The crack damage of continuous concrete on bridge deck is improved effectively.
【作者单位】：浙江大学土木工程学系;浙江建设职业技术学院城市建设工程系;
【基金】：浙江省交通厅纵向课题资助项目(2009H37) 浙江省科技创新团队资助项目(2010R50037)
【分类号】：U448.217;U441

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