波形钢腹板组合梁桥桥面板预应力施加研究与应用

Study and Application of Prestressing on Bridge Deck of Corrugated Steel Web Composite Beam Bridges

摘要:

为解决波形钢腹板组合梁桥墩顶负弯矩作用下混凝土桥面板受拉问题，探讨了波形钢腹板组合梁桥中施加墩顶预应力的有效方法；基于波形钢腹板组合梁桥的特点，针对墩顶负弯矩导致的混凝土桥面板受拉问题，采用理论分析与工程实例相结合的方式展开研究。通过深入分析桥梁结构的受力特性，提出了一套在不使用预应力束张拉的情况下，对混凝土桥面板施加有效预应力的工艺措施。研究结果表明精心设计的工艺措施能够有效实现对混凝土桥面板的预应力施加。为中大跨径波形钢腹板组合梁桥提供了新的设计思路，即无需预应力束张拉，通过特定工艺措施可对混凝土桥面板施加有效预应力，能有效抵抗恒载和活载产生的拉应力。

Abstract:

In order to solve the tensile problem of concrete bridge decks under the negative bending moments at the pier top of composite beam bridges with corrugated steel web plates, the effective method of applying the pier top prestress in composite beam bridges with corrugated steel web plates is discussed. Based on the characteristics of the composite beam bridge with corrugated steel web plates, and focusing on the tensile problem of the concrete bridge deck caused by the negative bending moment at the pier top, the research is carried out through the theoretical analysis and engineering examples. Through in-depth analysis of the stress characteristics of bridge structures, a set of process measures for applying effective prestress to concrete bridge decks without the use of prestressed bundle tensioning has been proposed. The research results confirm that the carefully designed process measures can effectively apply the prestress to concrete bridge decks, which provides a new design concept for medium-span and large-span corrugated steel web composite beam bridges, that is, there is no need for prestressed bundle tensioning. Through the specific process measures, the effective prestressing can be applied to the concrete bridge deck, and can effectively resist the tensile stress caused by dead and live loads.