采用钢弦式应力计测量预应力混凝土桥梁结构应力时，由于种种原因，将导致测试结果与理论计算结果不符。
When using reinforced-stress gauge to measure structural stresses in prestressed concrete girder bridge, there exist errors between measured values and the theoretical ones because of various factors.
结果表明：在钢桁梁桥弦杆内填混凝土能降低杆件的应力水平，提高桥梁的整体刚度。
The results show that the stresses of chord members of partially concrete-filled steel truss bridge are decreased, while its integral stiffness is increased.
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