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一、前言槽形梁的建筑高度最小,虽在养护上有若干缺点,但有时仍須采用。槽形梁的横梁的設計和检定,在規范上无明确規定,在文献上无算例可循,多凭經驗确定。几年以来,在营业綫上不断发現槽形梁的横梁上翼緣角鋼裂紋,經多次检算均有超应力存在,这說明对此部位不設計不检定的习慣作法必須改变,以保証行車安全。本文对运营綫上槽形梁的横梁上翼緣角鋼裂紋进行分析,然后据以拟定設計步驟并导出检定公式。二、裂紋情况某桥为1孔8.20米槽形梁,其构造如图1。在其18个小横梁36根上翼緣角鋼中发現有四个翼緣角鋼严重裂紋,三个翼緣角鋼水平肢裂紋迅速发展而致水平肢部份折断、脫落,如图2。破損率占19.45％。
First, the foreword Trough beam building height is minimal, although there are several shortcomings in conservation, but sometimes still need to be adopted. Trench beam beam design and verification, there is no specification in the specification, there are no examples in the literature to follow, determined by experience. Over the past few years, it has been found that cracks in the angle flanges on the beams of the trough girder on the sales line have been overstressed by numerous tests. This shows that the customary practice of not verifying this part must be changed to Ensure driving safety. In this paper, the angle crack on the upper flange of the beam on the operating trough beam is analyzed, and then the design steps and the verification formula are derived. Second, the crack situation A bridge for a hole 8.20 m groove beam, the structure shown in Figure 1. In its 18 small beams 36 upper flange angle found in the four flange angle serious cracks, the three flange angle horizontal limb rapid development of the limbs caused by horizontal limbs broken, fall off, as shown in Figure 2. Breakage rate accounted for 19.45%.