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0→初应力→1.05con（持荷2min）→0.9con→con（锚固） 0→初应力→0.9con→con（锚固）1.05con→（持荷2min） 0→初应力→0.9con→1.05con（持荷2min）→con（锚固） 0→初应力→0.9con→con（锚固）→1.05con（持荷2min）
Pine trees are classified as coniferous. Most pine trees remain green all year. Pine trees are more useful for timber than for landscaping. Pines are found throughout the Northern Hemisphere.
0→102%σcon 0→103%σcon 0→105%σcon→σcon 0→104%σcon
They differ among themselves by shades of green. Their pine needles are arranged in clusters. They are most common to the western United States. They have different numbers of branches.
They have an odd number of pine needles per cluster. They shed their leaves in winter. Their pine needles are longer than other varieties. They are only found in cultivated parks.
13A23A 23A13B 13A23B 13B23A
0→初应力→1.03σcon（锚固） 0→初应力→σcon（持荷5min锚固） 0→初应力→1.05σcon（持荷5min）→0→σcon（错固） 0→初应力→初应力→1.05σcon（持荷5min）→0.9σcon→σcon（锚固）
0→初应力→1.03σcon（锚固） 0→初应力→σcon（持荷5min锚固） 0→初应力→1.05σcon（持荷5min）→0→σcon（锚固） 0→初应力→1.05σcon（持荷5min）→0.9σcon→σcon（锚固）
0→102%σcon 0 →103%σcon 0→105%σcon→σcon 0 →104%σcon
0—-→1.03бcon 0-—→1.03бcon-—→бcon 0—-→1.05бcon 0-—→1.05бcon-—→бcon
0→1.05σcon 0→1.03σcon 0→σcon 0→1.08σcon（持荷2分钟）→σcon
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