新型UHPC-钢腹杆组合拱桥试设计

Trial Design of New Type UHPC-Steel Web Rod Combined Structure Arch Bridge

随着跨径的逐步增加,结构自重效应对于桥梁的影响越来越大,甚至成为限制拱桥跨径发展的主要因素之一.实现拱桥跨径的突破,必须降低结构自重效应.本文提出一种新型UHPC-钢腹杆组合拱桥构思,并以某上承式混凝土拱桥为工程背景,进行了新型UHPC-钢腹杆的组合拱桥的试设计.结果表明:新型UHPC-钢腹杆组合结构与原设计相比自重减轻了55.3%,并且结构受力性能良好,稳定性也能满足相应规范要求.大跨径拱桥自重效应的降低,其施工难度和施工成本也将得到有效地降低和控制.

With the gradual increase of the span,the influence of the structural self-weight effect on the bridge becomes greater and greater,and it has even become one of the most important factors restricting the development of the bridge span.To achieve a breakthrough in the span of an arch bridge,the self-weight effect of the structure must be reduced.Relevant literature shows that the effect ofreducing self-weight is mainly studied from two aspects;First from the perspective of force,the main structure is optimized,and the performance of the material is fully released to maximize the utilization rate of the material.Second concrete materials with higher strength and better performance,are used to make the section lighter and thinner.In this paper,combining these two aspects,a new concept of UHPC-steel web combined arch bridge is proposed.And with a certain deck concrete arch bridge as the engineering background,the trial design of a new UHPC-steel web combined arch bridge is carried out.Preliminary results show that the new UHPC-steel web bar combined structure has a 55.3%lighter weight than the original design,and the structure has good mechanical performance and stability that can meet the requirements of the corresponding specifications.With the reduction of the self-weight effect of the long-span arch bridge,the construction difficulty and construc-tion cost will also be effectively reduced and controlled.