EVALUATION OF LATERALLY LOADED PILE GROUP AT ROOSEVELT BRIDGE
EVALUATION OF LATERALLY LOADED PILE GROUP AT ROOSEVELT BRIDGE
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DOI：
10.1061/(asce)1090-0241(1997)123:12(1153
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发表时间：
1997-12
影响因子：
3.9
通讯作者：
P. Ruesta;F. Townsend
中科院分区：
文献类型：
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作者：
P. Ruesta;F. Townsend
采用固定头生产组进行静侧向荷载作用，采用隔离单桩和16根3径间隔预应力混凝土桩的大型试验组进行反力试验。在佛罗里达州斯图尔特的罗斯福桥替换处，基础由沙子覆盖部分胶结的沙子组成。试验组10根桩、反应组6根桩和单根桩分别安装应变仪和测斜仪。桩长约16.5米，为76平方厘米。采用标准贯入试验（SPT）、锥贯入试验（CPT）、DMT和PMT原位试验建立了土体剖面和p-y曲线。在测试之后，应变计和倾角计的数据被简化为“测量”的p-y曲线。根据SPT相关性和PMT结果建立的p-y曲线提供了准确的土壤表征。单桩承受320 kN，群桩承受约4800 kN。试验结果表明，开裂预应力混凝土桩的非线性特性在分析和数据精简中占主导地位。因此，具有非线性混凝土能力的FLPIER程序可以正确预测“后开裂”响应。通过p-y（实际上只有p）乘数准确地模拟了组间的相互作用，分别确定了领先、中间领先、中间落后和落后行的p-y乘数为0.8、0.7、0.3和0.3，总体组间p-y乘数为0.55。
An isolated single pile and a large-scale test group of 16 prestressed concrete piles spaced at three diameters were subjected to a static lateral loading using a fixed-headed production group for reaction. The foundation consisted of sand overlying a partially cemented sand at the Roosevelt Bridge replacement, Stuart, Florida. Ten piles of the test group, six piles of the reaction group, and a single pile were instrumented with strain gauges and inclinometers. The piles were 76 sq cm and approximately 16.5 m long. Standard penetration tests (SPT), cone penetration tests (CPT), DMT, and PMT in-situ tests were used to establish the soil profile and p-y curves. Subsequent to testing, the strain gauges and inclinometer data were reduced to "measured" p-y curves. The p-y curves developed from SPT correlations and PMT results provided an accurate soil representation. The single pile was subjected to 320 kN, while the pile groups were loaded to about 4,800 kN. The testing results show that the nonlinear characteristics of cracked prestressed concrete piles dominate analyses and data reduction. Consequently, the FLPIER program, with its nonlinear concrete capabilities, could predict properly the "postcracking" response. The group interaction was accurately modeled by p-y (actually p, only) multipliers, which were determined as 0.8, 0.7, 0.3, and 0.3 for the leading, middle leading, middle trailing, and trailing rows, respectively, with the overall group p-y multiplier being 0.55.