引言1973年10月在康涅狄格州,纽黑文附近的昆涅匹阿克河桥(Qwinnipac)悬跨的挑梁上发现一条大裂缝(图1,原图不清,略),该裂缝离悬跨的左端(西端)估计34英尺(10m)。悬跨长165英尺(50.3m)。该结构为非组合结构,在裂缝位置处纵梁高9英尺2.75英寸(2.8m)。图2示出裂缝已扩展到纵梁腹板(原图不 INTRODUCTION A large fracture (Figure 1, unclear, omitted) was found on a beam spanning the Qwinnipac Bridge near New Haven, Connecticut in October 1973, The left (west) cross is estimated 34 feet (10 m). The suspension span is 165 feet (50.3m). The structure is a non-combined structure with a longitudinal rail 9 feet 2.75 inches (2.8 m) tall at the crack location. Figure 2 shows that the crack has been extended to the stringer web (the original image is not