Experimental study on internal force and deformation of anchored bracing piles
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摘要: 桩锚支护正得到越来越多的应用，其理论尚欠完善，通过对护坡桩钢筋应力和水平位移动态测试数据的分析，得出了内力与变形分布规律；从钢筋受力和截面曲率两个途径，推导了两种护坡桩弯矩反算方法，并与m法和等值梁法进行了比较。结果表明桩身弯矩分布基本相同，数值差异很大，m法计算的弯矩最大，实测数据得到弯矩最小，传统的设计方法具有优化空间，理论上可节省一半的钢筋量，接近中和轴配筋越少。Abstract: The anchored bracing pile is more widely and more applied beyond its theory. Dynamic data of steel bar stress and horizontal displacement along piles are analyzed, and the distribution rules of internal force and deformation are gained. Based on steel bar force and section curvature, two methods to calculate bending moment along pile are deduced. Comparison between the m method and the equivalent beam method indicates that moment distribution is similar, but its numerical value is very discrepant. The m-method has the largest bending moment, and the in-situ measurement has the smallest bending moment. So the traditional design methods have large optimization space. Theoretically it can save half quantities of steel bars, which are less collocated near the central axis.
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