向拱(912年-986年),原名向训,字星民。怀州河内(今河南沁阳市)人。五代至北宋初年大将。 向拱早年投靠河东大将郭威,成为其心腹。郭威建立后周,向拱历任皇城使、知陕州、左神武大将军等职,率军抵御北汉,并奉命征讨慕容彦超。周世宗时期,向拱参与高平之战、淮南之战,并与王景协力收复关右四州,战功卓著。北宋建立后,累官至左卫上将军、判左金吾街仗事,封秦国公。 雍熙三年(986年),向拱去世,年七十五。获赠中书令。
还探讨了第六向拱和梁宽度的取法,及五向、六向调整时剪应力计算方法;
The width of arch or cantilever and the calculation of shear stress are also investigated.
传统的前向拱丝越来越难以满足目前封装的高密度要求,反向拱丝能满足非常低的弧高的要求。
Traditional forward looping technology is becoming hard to meet high-density requirements of IC Packaging, and reverse looping can comparatively achieve very low loop height.
分两组由拱板下弦跨中同时向拱板支座浇筑混凝土,然后从拱板支座连续沿拱板上弦向中间合龙,使浇筑荷载相对均衡。
Concrete was poured in separately from mid-span of arch slab to the supports and then from the supports to the top chord of the arch chord so as to balance the pouring load.
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