A crack surface displacement of four-point-bend specimen under three types of loading is studied in this paper.
研究了四点弯曲型试件在各种类型载荷作用下的裂纹面位移，并考虑了裂纹尖端塑性区对它的影响。
Theoretical research based on the quasi-static test, organized loading-displacement hysteretic curves, found out timber frame's approximate yield point;
此外又在试验基础上进行了理论研究，根据试验数据整理出木构架的荷载位移滞回曲线，找出了木构架的近似屈服点；
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