谁能帮我解释一下出现warning的原因

Date: 10/30/2012 Time: 21:13:18
___________________________________________________
| |
| Livermore Software Technology Corporation |
| |
| 7374 Las Positas Road |
| Livermore, CA 94551 |
| Tel: (925) 449-2500 Fax: (925) 449-2507 |
| www.lstc.com |
|_________________________________________________|
| |
| LS-DYNA, A Program for Nonlinear Dynamic |
| Analysis of Structures in Three Dimensions |
| Version: 970 Date: 01/10/2005 |
| Revision: 5434a Time: 18:01:01 |
| |
| Features enabled in this version: |
| ANSYS Database format |
| Shared Memory Parallel |
| |
| Licensed to: |
| |
| Platform : |
| OS Level : WINDOWS XP |
| Hostname : FREESKYC-1D9860 |
| Precision : Single precision (I4R4) |
| |
| Unauthorized use infringes LSTC copyrights |
|_________________________________________________|
Input file: C:\PROGRA~1\ANSYSI~1\RC-COL~1.K
The native file format : 32-bit small endian
Memory size from default : 8500000
expanding memory to 8500000
******** notice ******** notice ******** notice ********
* *
* This is the LS-DYNA Explicit Finite Element code. *
* Neither LSTC nor the authors assume any responsibility for *
* the validity, accuracy, or applicability of any results *
* obtained from this system. The user must verify his own *
* results. *
* *
* LSTC endeavors to make the LS-DYNA code as complete, *
* accurate and easy to use as possible. *
* Suggestions and comments are welcomed. Please report any *
* errors encountered in either the documentation or results *
* immediately to LSTC through your site focus. *
* *
* Copyright (C) 1990-2005 *
* by Livermore Software Technology Corp. (LSTC) *
* All rights reserved *
* *
******** notice ******** notice ******** notice ********
contracting memory to 24720
expanding memory to 50476
expanding memory to 98716
expanding memory to 146086
expanding memory to 206086
expanding memory to 237104
expanding memory to 298612
expanding memory to 343378
contracting memory to 2
LS-DYNA will perform a structural only analysis
ALALYSIS OF A RC-COLUMN
ls-dyna (version 970 ) date 01/10/2005
expanding memory to 2580
expanding memory to 13935
contracting memory to 10054
expanding memory to 107617
expanding memory to 108176
expanding memory to 110597
expanding memory to 185798
expanding memory to 187809
contracting memory to 186859
expanding memory to 189658
expanding memory to 205638
contracting memory to 200626
expanding memory to 213156
expanding memory to 213865
expanding memory to 221653
contracting memory to 214556
expanding memory to 214601
contracting memory to 214601
contracting memory to 214601
expanding memory to 214681
contracting memory to 214681
expanding memory to 214684
contracting memory to 214684
*** Warning Massless nodes
The following massless nodes were found
node # 2
node # 3
node # 4
node # 5
node # 6
node # 7
node # 8
node # 9
node # 10
node # 12
node # 22
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