1.引言 1.1 桥式 全桥长390m支承在离谷底35m的空心矩形桥墩上(图1a),全桥分为10跨,中间跨度为40m,两端为35m。上部结构由两个分离的单室箱形梁组成,梁高3m,纵向及横向均施以限制预应力。距支承0.2～0.81区段的横截面是不变的,而在支座区段则以向内的弧形进行加劲(图1b)。在支座顶上设横梁,其余部份的箱梁则未加强。 1. INTRODUCTION 1.1 The full bridge length of 390m is supported by a hollow rectangular piers 35m from the bottom of the valley (Figure 1a). The full bridge is divided into 10 spans with a median span of 40m and ends 35m. The superstructure consists of two separate single-chamber box beams with 3 m of beam height and longitudinal and lateral restraints. The cross-section from the section supporting 0.2-0.81 is constant, while the bearing section is stiffened by an inward curve (Figure 1b). At the top of the support beam, the remaining part of the box beam is not strengthened.