桥梁可定义为：跨越河川、渠道、山区、谷地、溪谷、湖泊、海峡、市街、公路、铁路等障碍而构筑人行、公路、铁路、捷运或水路之通道，其构造物之总称。与模板相仿的是，目前桥梁的「梁」字，在工程统一用字上，应采用「梁」字，而非「梁」字，交通部颁布之「公路桥梁设计规范」及「公路桥梁耐震设计规范」即采用「梁」字。
Bridges can be defined as: the passage of pedestrian, highway, railway, MRT or waterway, which is constructed across rivers, channels, mountains, valleys, valleys, lakes, channels, municipal streets, highways, railways, etc., and its structure is generally called. Similar to the template, the word "beam" of the current bridge should be used in the unified word of the project, rather than the word "beam". The "design code for highway bridges" issued by the Ministry of communications and the "seismic design code for highway bridges" adopted the word "beam".
现代桥梁的主要材料多采用混凝土及钢材，展现之型式有钢筋混凝土桥梁、预力混凝土桥梁、钢构造桥梁以及复合式、组合式等型态，原则上可概分为混凝土系列桥梁及钢构造系列桥梁两大系统。
The main materials of modern bridges are mostly concrete and steel, which show the reinforced concrete bridge, pre force concrete bridge, steel structure bridge girder and composite and combined type, which can be divided into two systems: concrete series bridge and steel structure series bridge in principle.
至于桥梁的组成，可分为下部结构及上部结构两大部分。下部结构可区分为深基础、浅基础、桥台及桥墩，上部结构可区分为板桥(实心板桥及中聚氨酯软管 PVC软管 隔离墩模具 u型槽模具 护坡模具 pvc输送带 尼龙输送带 天津除甲醛 北京除甲醛 空板梁桥)、梁桥、拱桥、斜张桥、桁架桥及吊桥等。实务上亦常采用上部结构型式作为桥梁之分类。其中梁桥为桥梁之主要桥形，如I形梁桥、U形梁桥、T形梁桥、双T形梁桥、箱形梁桥(可搭配预铸斜撑板设计)等。
As for the composition of the bridge, it can be divided into two parts: substructure and superstructure. The substructure can be divided into deep foundation, shallow foundation, abutment and pier, and the upper structure can be divided into slab bridge (solid slab bridge and hollow slab girder bridge), beam bridge, arch bridge, inclined tension bridge, truss bridge and suspension bridge. In practice, superstructure is also used as the classification of bridges. Among them, the beam bridge is the main bridge shape of the bridge, such as I-beam bridge, U-beam bridge, T-beam bridge, double T-beam bridge, box girder bridge (can be designed with pre cast diagonal plate).