Modular timber/concrete composite system for short-span bridges

建议的研究目标是开发一种可行的短跨度简支公路桥梁体系，该体系满足所有适用的设计要求，同时提供比目前使用的体系更经济和更快的施工速度。 该系统基于以胶合木梁为主要纵向结构元素的结构概念。这些梁将支撑由超高性能纤维混凝土(UHPFRC)组成的相对较薄的桥面板，该板将连接到梁以形成组合作用，这将使两种材料能够以最有效的方式共同承载荷载。一个给定的跨度将由多个平行的预制模块组装而成，每个模块由两个胶合木横梁(短横梁)以固定的间隔连接在一起，并由桥面板的一部分在整个主梁长度上连接，从而形成一个倒U形。相邻的模块将通过连接相邻的木梁和通过UHPFRC纵向合龙浇注来连接。 该项目的主要任务包括(1)通过分析研究优化结构系统的主要尺寸，以及(2)通过实验验证关键结构部件和整个系统。

The proposed research has as its objective to develop a feasible system for short-span simply supported highway bridges that satisfies all applicable design requirements while offering greater economy and speed of construction than currently used systems. The system is based on a structural concept that has glued-laminated (glulam) timber girders as the primary longitudinal structural element. These girders will support a relatively thin deck slab composed of ultra high-performance fibre reinforced concrete (UHPFRC), which will be connected to the girders to establish composite action, which will enable both materials to work together in the most efficient manner to carry load. A given span will be assembled from multiple parallel prefabricated modules, each of which consists of two glulam girders linked by glulam diaphragms (short transverse beams) at regular intervals and by a portion of the deck slab over the entire length of the girders, thus forming an inverted "U". Adjacent modules will be linked by connecting the abutting timber girders and by a longitudinal closure pour of UHPFRC. The primary tasks to be performed on this project consist of (1) optimizing the primary dimensions of the structural system through analytical studies, and (2) validating experimentally critical structural components and the overall system.