架构师提供的文本描述。菲利斯·蒂利纪念人行桥横跨三一河，将三一公园与一条新的小径连接起来，这条小径一直延伸到沃斯堡市中心。这座桥有一个优美的轮廓，增强了宁静和美丽的景观。一座跨度为163‘(49.5m)的钢拱在河面上支撑着钢应力带段和预制混凝土板，补充了相邻的历史悠久的兰开斯特车桥。这座368‘(112米)长的钢带/拱形组合桥是北美第一座此类桥梁。这种非常规的结构组合是由于场地条件、视觉目标以及沃斯堡市希望沿着这条河建造一个特别而难忘的建筑而选择的。

Text description provided by the architects. The Phyllis Tilley Memorial Pedestrian Bridge crosses over the Trinity River connecting Trinity Park to a new trail that terminates in downtown Fort Worth. The bridge has a graceful profile that enhances the serene and beautiful landscape. A steel arch with a span of 163’ (49.5m) supports steel stress ribbon segments and precast concrete planks over the river complementing the adjacent historic Lancaster vehicular bridge. This 368’ (112m) long steel stressed ribbon/arch combination bridge is the first of its kind in North America. This unconventional structural combination was selected as a result of the site conditions, visual objectives, and the desire of the City of Fort Worth to build a special and memorable structure along the river.

 Courtesy of Rosales + Partners Architects

罗萨莱斯合伙人建筑师

拱门横跨整个河流，钢制的预应力丝带轻快地坐在圆形拱门上，似乎向桥台流动。应力带的最小垂度剖面产生了主要的张力载荷，与钢拱引起的相反方向的推力载荷保持平衡。平衡这些相对的荷载，使所需的地基尺寸最小化。为了保证弯曲应力不超过临界水平，选择了一个圆形桥台鞍座，并对其半径进行了仔细计算，从而提高了整个桥梁结构的耐久性。预制混凝土板已直接锚定在钢带上，形成桥梁走道，消除了在河流和邻近海岸线上临时搭建脚手架的需要。垂直支撑柱的缺失降低了周期性河流洪水造成的水平荷载。过桥的行人和骑自行车的人将经历一个平滑的，起伏的ADA柔顺的桥面。在夜间，桥被白色和蓝色LED照明的组合照亮，以增加安全性和审美吸引力。这座优雅且经济实惠的桥梁已成为三一河沿岸的视觉资产，也是沃斯堡市的新标志。

The arch spans the entire river and the steel stressed ribbons sit airily over the rounded arch, appearing to flow toward the abutments. The minimal sag profile of the stressed ribbons creates major tension loads which are balanced against the thrust loading in the opposite direction caused by the steel arch. The balancing of these opposing loads minimizes the required size of the foundations. A rounded abutment saddle, with its carefully calculated radius was chosen to ensure that bending stresses never exceed a  critical level, increasing the durability of the overall bridge structure. Pre-fabricated concrete planks have been anchored directly to the steel stress ribbons to form the bridge walkway, eliminating the need for temporary scaffolding in the river and on the adjacent shorelines. The absence of vertical support struts reduces horizontal loads created by periodical river flooding. Pedestrians and bicyclists crossing the bridge will experience a smooth, undulating ADA compliant bridge surface. At night, the bridge is illuminated  by a combination of white and blue LED lighting for increased safety and aesthetic appeal. This elegant and cost effective bridge has become a visual asset along the Trinity River and a new symbol of the City of Fort Worth.