Research purposes: It is one complex engineering problem for bridge structural design. There are many reasons for leading to crack turned up on reinforced concrete bridge structural components. Among them, both irrational components outline and reinforced concrete design were main reasons for crack turned up.
Research methods: For argument about this view point writer took three reinforced concrete bridges in her country as engineering background:(1) During construction, crack of one main span 40 m+65 m+40m prestressed concrete continuous beam bridge was found on main pier of the bridge. (2)During construction, some cracks of one large span reinforced concrete half-through highway arch bridge with both stringer and horizontal girder system were found on these horizontal girders.(3)The main beam anchor outline of one twin beams cable-stayed bridge in the south China area was changed. By 8-point isoperimetric element spatial analysis of Super SAP software, these local models were separately setup and we can carry on stress calculation as well as.
Research Conclusions: Both irrational components outline and reinforcement design lead to increase in tension of structural component and maximum stress seat just as the crack site of real component. Obviously, it can be explained production creak of concrete component from the angle of calculation stress. It is showed that it is important influence of both structural components outline and reinforced concrete design on their calculation stress besides loads.
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