本文用來(lái)指導(dǎo)AMAT項(xiàng)目的管道支架的抗震做法，其中的內(nèi)容是基于美國(guó)規(guī)范UBC1997關(guān)于非結(jié)構(gòu)構(gòu)件的抗震設(shè)計(jì)條文進(jìn)行計(jì)算的。

對(duì)于單根管道（包括風(fēng)管、水管、電纜等）的吊架，要求不大于12m做一對(duì)水平拉桿，不大于24m做一對(duì)垂直拉桿。對(duì)于此種吊掛形式，無(wú)論管道長(zhǎng)短，要至少有兩對(duì)水平拉桿和一對(duì)垂直拉桿。

對(duì)于用槽鋼或者角鋼做成的用來(lái)放置多根管道的支架，當(dāng)其中管道直徑都小于100mm時(shí)，每隔12m做一對(duì)水平和垂直的拉桿，當(dāng)其中的管道直徑在100mm～200mm時(shí)，每隔6m做一對(duì)水平和垂直的拉桿。而且對(duì)于此種支架要求在端部必須加水平和垂直的拉桿。

下表給出對(duì)應(yīng)的管道重量（包括支架重量），按照公式計(jì)算出來(lái)的拉桿的拉力，和推薦的吊桿形式。其中連接拉桿和支架及結(jié)構(gòu)構(gòu)件的五金件選用時(shí)要求要能滿足表中所列出的拉力值，必須有相應(yīng)的資料和報(bào)告證明其設(shè)計(jì)承載力大于相應(yīng)的拉力值方可使用。下表中的拉桿安裝的角度要求在35度到55度之間。

單根管道的拉桿的抗震設(shè)計(jì)值

支架形式的拉桿抗震設(shè)計(jì)值（用于12m一對(duì)拉桿）

支架形式的拉桿抗震設(shè)計(jì)值（用于6m一對(duì)拉桿）

符合下列要求的管道可不做抗震措施。

1．重量小于180kg的懸掛設(shè)備。

2．內(nèi)徑小于25mm的煤氣管道和內(nèi)徑小于60mm的電氣配管。

3．矩形面積小于0.38m2和圓形直徑小于0.70m的風(fēng)管。

4．吊桿計(jì)算長(zhǎng)度不超過(guò)300mm的吊桿懸掛管道。

5．直徑小于55mm的水管。

6．對(duì)于易燃易爆和有毒性的氣體或者液體管道，需要按照相關(guān)的規(guī)范確定。

此版本提供了抗震支撐安裝時(shí)，8.8級(jí)*普通螺栓的選型型式。如果采用膨脹螺栓，必需保證使用的膨脹螺栓（一個(gè)或者一組）的抗拉力大于表中所列的拉力。其中需要注意的是在五金件和連接件的采購(gòu)中，要根據(jù)現(xiàn)場(chǎng)管道的型式和重量，采用對(duì)應(yīng)螺栓孔大小的五金件和連接件，避免因?yàn)椴少?gòu)的五金件和連接件上預(yù)留的螺栓孔直徑不夠，導(dǎo)致螺栓無(wú)法安裝。

GUIDE OF SEISMIC BRACE FOR PIPE RACK

(REV.2 2006.11.14)

The guide is used to restraint seismic for pipe and duct racks in AMAT project. The guide follow the UBC1997 regarding non-structural seismic design section.

For single pipe including pipe /duct /conduit, the brace space must be not more than 12m in latitudinal way, and not more than 24m in longitudinal way.

For pipe rack that composed with angle or channel, if the entire pipes diameter is less than 100mm, the brace space must be not more than 12m in latitudinal and longitudinal way.  If the entire pipes diameter is between 100mm to 200mm, the brace space must be not more than 6m in latitudinal and longitudinal way. And the latitudinal and longitudinal brace need be installed at the each end of the pipe run.

You can find the tension of brace and member size of the brace that I recommendate per pipes weight in the table below. Before the installation of the brace, the subcontractor need get the material report to testify the load-carrying capacity of member and connection are more than the tension of brace that show in the table below. The angel of the brace should be between 350 to 550.

Seismic force of brace for single pipe:

Seismic force of brace for pipe rack (applicable to brace space < 12m):

The pipes and ducts without anti-seismic requirement are below:

A. Utility that weight is less than 180kg.

B. φ< 25mm coal gas pipe and φ< 60 mm electrical conduit

C. Area < 0.38 m2 rectangular and