請問下面的信息是什么含義？
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**ERROR- WITH MEMBER TENSION/COMPRESSION EACH LOAD CASE MUST BE
FOLLOWED BY
PERFORM ANALYSIS THEN CHANGE.
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咔咔的 如果在建模時使用了 MEMBER TENSION 和MEMBER COMPRESSION命令，程序中規定對每一個荷載基本工況必須進行單獨分析，MEMBER TENSION（僅受拉構件）命令所定義的構件必須是在每一個CHANGE（改變）命令之后給出的（最后一個除外）。這是因為每一個CHANGE命令表明前一個的MEMBER TENSION命令已被取消。如果需要，必須從新定義MEMBER TENSION。
例如如下的輸入是錯的：
MEMBER TENSION
884 TO 895 900 903 TO 945
LOAD 1 DEAD LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 UNI GY -0.12
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.06
LOAD 2 LIVE LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 433 434 UNI GY -0.44
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.22
LOAD 3 EQUIPMENT LOAD
MEMBER LOAD
248 TO 259 283 TO 305 328 TO 349 UNI GY -0.26
260 TO 282 306 TO 327 UNI GY -0.17
LOAD 4 WIND LOAD WEST TO EAST
JOINT LOAD
107 FX 3.67
25 490 FX 7.41
LOAD 5 WIND LOAD EAST TO WEST
JOINT LOAD
110 FX -7.34
111 FX -3.67
PERFORM ANALYSIS STATICS CHECK
下面的輸入是正確的：
MEMBER TENSION
884 TO 895 900 903 TO 945
LOAD 1 DEAD LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 UNI GY -0.12
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.06
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 2 LIVE LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 433 434 UNI GY -0.44
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.22
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 3 EQUIPMENT LOAD
MEMBER LOAD
248 TO 259 283 TO 305 328 TO 349 UNI GY -0.26
260 TO 282 306 TO 327 UNI GY -0.17
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 4 WIND LOAD WEST TO EAST
JOINT LOAD
107 FX 3.67
25 490 FX 7.41
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 5 WIND LOAD EAST TO WEST
JOINT LOAD
110 FX -7.34
111 FX -3.67
PERFORM ANALYSIS STATICS CHECK
CHANGE
2017年10月26日
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如果在建模時使用了 MEMBER TENSION 和MEMBER COMPRESSION命令，程序中規定對每一個荷載基本工況必須進行單獨分析，MEMBER TENSION（僅受拉構件）命令所定義的構件必須是在每一個CHANGE（改變）命令之后給出的（最后一個除外）。這是因為每一個CHANGE命令表明前一個的MEMBER TENSION命令已被取消。如果需要，必須從新定義MEMBER TENSION。
例如如下的輸入是錯的：
MEMBER TENSION
884 TO 895 900 903 TO 945
LOAD 1 DEAD LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 UNI GY -0.12
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.06
LOAD 2 LIVE LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 433 434 UNI GY -0.44
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.22
LOAD 3 EQUIPMENT LOAD
MEMBER LOAD
248 TO 259 283 TO 305 328 TO 349 UNI GY -0.26
260 TO 282 306 TO 327 UNI GY -0.17
LOAD 4 WIND LOAD WEST TO EAST
JOINT LOAD
107 FX 3.67
25 490 FX 7.41
LOAD 5 WIND LOAD EAST TO WEST
JOINT LOAD
110 FX -7.34
111 FX -3.67
PERFORM ANALYSIS STATICS CHECK
下面的輸入是正確的：
MEMBER TENSION
884 TO 895 900 903 TO 945
LOAD 1 DEAD LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 UNI GY -0.12
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.06
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 2 LIVE LOAD
MEMBER LOAD
379 380 384 TO 412 425 TO 428 433 434 UNI GY -0.44
413 TO 424 437 TO 440 843 846 TO 849 UNI GY -0.22
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 3 EQUIPMENT LOAD
MEMBER LOAD
248 TO 259 283 TO 305 328 TO 349 UNI GY -0.26
260 TO 282 306 TO 327 UNI GY -0.17
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 4 WIND LOAD WEST TO EAST
JOINT LOAD
107 FX 3.67
25 490 FX 7.41
PERFORM ANALYSIS STATICS CHECK
CHANGE
LOAD 5 WIND LOAD EAST TO WEST
JOINT LOAD
110 FX -7.34
111 FX -3.67
PERFORM ANALYSIS STATICS CHECK
CHANGE